CYRS1542AV18
CYRS1544AV18
72-Mbit QDR® II+ SRAM Two-Word
Burst Architecture with RadStop™ Technology
72-Mbit QDR® II+ SRAM Two-Word Burst Architecture with RadStop™ Technology
Radiation Performance
Radiation Data
■
JTAG 1149.1 compatible test access port
■
DLL for accurate data placement
■
Total Dose =300 Krad
Configurations
■
Soft error rate (both Heavy Ion and proton)
Heavy ions 1 × 10-10 upsets/bit-day with an external SECDED
EDAC Controller
CYRS1542AV18 – 4 M × 18
Neutrons = 2.0 × 1014 N/cm2
Functional Description
■
109 rad(Si)/sec
■
Dose rate = 2.0 ×
■
Dose rate survivability (rad(Si)/sec) = 1.5 × 10^11 rad(Si)/sec
■
Latch up immunity = 120 MeV.cm2/mg (125 °C)
Prototyping Options
■
Non qualified CYPT1542AV18 and CTPT1544AV18 devices
with same functional and timing characteristics in a 165-ball
Ceramic Column Grid Array (CCGA) package
Features
■
Separate independent read and write data ports
❐ Supports concurrent transactions
■
250-MHz clock for high bandwidth
■
Two-word burst on all accesses
■
Double data rate (DDR) interfaces on both read and write ports
at 250 MHz (data transferred at 500 MHz)
■
Two input clocks (K and K) for precise DDR timing
❐ SRAM uses rising edges only
■
Echo clocks (CQ and CQ) simplify data capture in high speed
systems
■
Single multiplexed address input bus latches address inputs
for both read and write ports
■
Separate port selects for depth expansion
■
Synchronous internally self-timed writes
■
QDR® II operates with 2.0 cycle read latency when delay lock
loop (DLL) is enabled
■
Available in × 18 and × 36 configurations
■
Full data coherency, providing most current data
■
Core VDD = 1.8 V (±0.1 V); I/O VDDQ = 1.4 V to VDD
■
Available in 165-ball CCGA (21 × 25 × 2.83 mm)
■
HSTL inputs and variable drive HSTL output buffers
Cypress Semiconductor Corporation
Document Number: 001-60006 Rev. *M
•
CYRS1544AV18 – 2 M × 36
The CYRS1542AV18 and CYRS1544AV18 are synchronous
pipelined SRAMs, equipped with 1.8-V QDR II+ architecture with
RadStop™ technology. Cypress’s state-of-the-art RadStop
Technology is radiation hardened through proprietary design and
process hardening techniques.
The QDR II+ architecture consists of two separate ports to
access the memory: the read port and the write port. The read
port has dedicated data output bus to support read operations
and the write port has dedicated data input bus to support write
operations. QDR II+ architecture completely eliminates the need
to “turnaround” the data bus that exists with common I/O devices.
Each port is accessed through a common address bus.
Addresses for read are latched on the rising edges of the input
(K) clock whereas addresses for write are latched on the falling
edges of the input (K) clock. Accesses to the QDR II+ read and
write ports are completely independent of each another. To
maximize data throughput, both read and write ports are
equipped with DDR interfaces. Each address location is
associated with two 18-bit words for CYRS1542AV18, or two
36-bit words for CYRS1544AV18 that burst sequentially into or
out of the device. Since data can be transferred on every rising
edge of both input clocks (K and K#), memory bandwidth is
maximized while simplifying system design by eliminating bus
“turnarounds”.
Depth expansion is accomplished with port selects, which
enables each port to operate independently.
All synchronous inputs pass through input registers controlled by
the K or K input clocks. All data outputs pass through output
registers controlled by the K or K input clocks as well. Reads and
writes are conducted with on-chip synchronous self-timed
circuitry.
For a complete list of related resources, click here.
Selection Guide
Description
250 MHz Unit
Maximum operating frequency
Maximum operating current
(concurrent R/W)
198 Champion Court
•
250
MHz
× 18
1700
mA
× 36
1700
San Jose, CA 95134-1709
•
408-943-2600
Revised January 9, 2015
CYRS1542AV18
CYRS1544AV18
Logic Block Diagram – CYRS1542AV18
K
CLK
Gen.
DOFF
21
Address
Register
Read Add. Decode
K
Write
Reg
2M x 18 Array
Address
Register
Write
Reg
2M x 18 Array
A(20:0)
21
18
Write Add. Decode
D[17:0]
A(20:0)
RPS
Control
Logic
Read Data Reg.
CQ
36
VREF
WPS
18
Control
Logic
18
BWS[1:0]
Reg.
Reg. 18
Reg.
18
CQ
18
Q[17:0]
QVLD
Logic Block Diagram – CYRS1544AV18
K
CLK
Gen.
DOFF
20
Address
Register
Read Add. Decode
K
Write
Reg
1M x 36 Array
Address
Register
Write
Reg
1M x 36 Array
A(19:0)
20
36
Write Add. Decode
D[35:0]
A(19:0)
RPS
Control
Logic
Read Data Reg.
CQ
72
VREF
WPS
36
Control
Logic
BWS[3:0]
36
Reg.
Reg. 36
Reg.
36
CQ
36
Q[35:0]
QVLD
Document Number: 001-60006 Rev. *M
Page 2 of 34
CYRS1542AV18
CYRS1544AV18
Contents
Manufacturing Flow .......................................................... 4
Radiation Hardened Design ........................................ 4
Neutron Soft Error Immunity ........................................... 4
Pin Configuration ............................................................. 5
Pin Definitions .................................................................. 6
Functional Overview ........................................................ 8
Read Operations ......................................................... 8
Write Operations ......................................................... 8
Byte Write Operations ................................................. 8
Concurrent Transactions ............................................. 8
Depth Expansion ......................................................... 8
Programmable Impedance .......................................... 8
Echo Clocks ................................................................ 9
Valid Data Indicator (QVLD) ........................................ 9
DLL .............................................................................. 9
Qualification and Screening ........................................ 9
Application Example ...................................................... 10
Truth Table ...................................................................... 11
Write Cycle Descriptions ............................................... 11
Write Cycle Descriptions ............................................... 12
IEEE 1149.1 Serial Boundary Scan (JTAG) .................. 13
Disabling the JTAG Feature ...................................... 13
Test Access Port ....................................................... 13
Performing a TAP Reset ........................................... 13
TAP Registers ........................................................... 13
TAP Instruction Set ................................................... 13
TAP Controller State Diagram ....................................... 15
TAP Controller Block Diagram ...................................... 16
TAP Electrical Characteristics ...................................... 16
TAP AC Switching Characteristics ............................... 17
TAP Timing and Test Conditions .................................. 18
Identification Register Definitions ................................ 19
Document Number: 001-60006 Rev. *M
Scan Register Sizes ....................................................... 19
Instruction Codes ........................................................... 19
Boundary Scan Order .................................................... 20
Power Up Sequence in QDR II+ SRAM ......................... 21
Power Up Sequence ................................................. 21
DLL Constraints ......................................................... 21
Maximum Ratings ........................................................... 22
Operating Range ............................................................. 22
Electrical Characteristics ............................................... 22
DC Electrical Characteristics ..................................... 22
AC Electrical Characteristics ..................................... 23
Radiation Performance .................................................. 23
Capacitance .................................................................... 23
Thermal Resistance ........................................................ 23
AC Test Loads and Waveforms ..................................... 24
Switching Characteristics .............................................. 25
Switching Waveforms .................................................... 26
Ordering Information ...................................................... 27
Ordering Code Definitions ......................................... 27
Package Diagram ............................................................ 28
Acronyms ........................................................................ 29
Document Conventions ................................................. 29
Units of Measure ....................................................... 29
Glossary .......................................................................... 30
Document History Page ................................................. 31
Sales, Solutions, and Legal Information ...................... 34
Worldwide Sales and Design Support ....................... 34
Products .................................................................... 34
PSoC® Solutions ...................................................... 34
Cypress Developer Community ................................. 34
Technical Support ..................................................... 34
Page 3 of 34
CYRS1542AV18
CYRS1544AV18
Manufacturing Flow
Step
Screen
Method
Requirement
1
Wafer lot acceptance test
TM 5007
2
Internal visual
2010, Condition A
3
Serialization
4
Temperature cycling
1010, Condition C, 50 cycles minimum
100%
5
Constant acceleration
2001, YI orientation only
100%
7
Particle impact noise detection (PIND)
2020 Condition A
8
Radiographic (X-ray)
2012, one view (Y-1 orientation) only
9
Pre burn in electrical parameters
In accordance with applicable Cypress specification
100%
10
Dynamic burn in
1015, Condition D
100%
6
–
100%
100%
Condition TBD (package in design)
100%
240 hours at 125 °C or 120 hours at 150 °C minimum
11
Interim (post dynamic burn in) electricals
In accordance with applicable Cypress device specifications
100%
12
Static burn in
1015, Condition C, 72 hours at 150 °C or 144 hours at 125 °C
minimum
100%
13
Interim (post static burn in) electricals
In accordance with applicable Cypress device specifications
100%
14
Percent defective allowable (PDA) calculation 5% overall, 3% functional parameters at 25 °C
All lots
15
Final electrical test
100%
In accordance with applicable Cypress device specifications
a. Static tests
(1) 25 °C
5005, Table I, Subgroup 1
(2) –55 °C and +125 °C
5005, Table I, Subgroup 2, 3
b. Functional tests
(1) 25 C
5005, Table I, Subgroup 7
(2) –55 °C and +125 C
5005, Table I, Subgroup 8a, 8b
c. Switching test at 25 °C
5005, Table I, Subgroup 9
Seal (fine and gross leak test)
1014
17
External visual
2009
18
Wafer lot specific life test (Group C)
Mil-PRF 38535, Appendix B, section B.4.2.c
16
Radiation Hardened Design
The single event latch up (SEL) immunity is improved by a
radiation hardened design technique developed by Cypress
called RadStop. This design mitigation technique allows the SEL
performance to achieve radiation hard performance levels.
100%
100%
All wafer lots
Neutron Soft Error Immunity
Parameter
Description
LSBU
Logical
single-bit
upsets
Logical
multi-bit
upsets
Single event
latch up
LMBU
SEL
Test
Conditions
25 °C
Typ
Max*
Unit
320
368
FIT/
Mb
25 °C
0
0.01
FIT/
Mb
125 °C
0
0.1
FIT/
Dev
* No LMBU or SEL events occurred during testing; this column represents a
statistical 2, 95% confidence limit calculation. For more details refer to
application note AN54908 “Accelerated Neutron SER Testing and Calculation of
Terrestrial Failure Rates”
Document Number: 001-60006 Rev. *M
Page 4 of 34
CYRS1542AV18
CYRS1544AV18
Pin Configuration
Pin configurations for CYRS1542AV18 and CYRS1544AV18.[1]
Figure 1. 165-ball CCGA pinout
CYRS1542AV18 (4 M × 18)
1
2
3
4
5
6
7
8
9
10
11
A
CQ
NC/144M
A
WPS
BWS1
K
NC/288M
RPS
A
A
CQ
B
NC
Q9
D9
A
NC
K
BWS0
A
NC
NC
Q8
C
NC
NC
D10
VSS
A
A
A
VSS
NC
Q7
D8
D
NC
D11
Q10
VSS
VSS
VSS
VSS
VSS
NC
NC
D7
E
NC
NC
Q11
VDDQ
VSS
VSS
VSS
VDDQ
NC
D6
Q6
F
NC
Q12
D12
VDDQ
VDD
VSS
VDD
VDDQ
NC
NC
Q5
G
NC
D13
Q13
VDDQ
VDD
VSS
VDD
VDDQ
NC
NC
D5
H
DOFF
VREF
VDDQ
VDDQ
VDD
VSS
VDD
VDDQ
VDDQ
VREF
ZQ
J
NC
NC
D14
VDDQ
VDD
VSS
VDD
VDDQ
NC
Q4
D4
K
NC
NC
Q14
VDDQ
VDD
VSS
VDD
VDDQ
NC
D3
Q3
L
NC
Q15
D15
VDDQ
VSS
VSS
VSS
VDDQ
NC
NC
Q2
M
NC
NC
D16
VSS
VSS
VSS
VSS
VSS
NC
Q1
D2
N
NC
D17
Q16
VSS
A
A
A
VSS
NC
NC
D1
P
NC
NC
Q17
A
A
QVLD
A
A
NC
D0
Q0
R
TDO
TCK
A
A
A
NC
A
A
A
TMS
TDI
CYRS1544AV18 (2 M × 36)
1
2
3
4
5
6
7
8
9
10
11
A
CQ
NC/288M
A
WPS
BWS2
K
BWS1
RPS
A
NC/144M
CQ
B
Q27
Q18
D18
A
BWS3
K
BWS0
A
D17
Q17
Q8
C
D27
Q28
D19
VSS
A
A
A
VSS
D16
Q7
D8
D
D28
D20
Q19
VSS
VSS
VSS
VSS
VSS
Q16
D15
D7
E
Q29
D29
Q20
VDDQ
VSS
VSS
VSS
VDDQ
Q15
D6
Q6
F
Q30
Q21
D21
VDDQ
VDD
VSS
VDD
VDDQ
D14
Q14
Q5
G
D30
D22
Q22
VDDQ
VDD
VSS
VDD
VDDQ
Q13
D13
D5
H
DOFF
VREF
VDDQ
VDDQ
VDD
VSS
VDD
VDDQ
VDDQ
VREF
ZQ
J
D31
Q31
D23
VDDQ
VDD
VSS
VDD
VDDQ
D12
Q4
D4
K
Q32
D32
Q23
VDDQ
VDD
VSS
VDD
VDDQ
Q12
D3
Q3
L
Q33
Q24
D24
VDDQ
VSS
VSS
VSS
VDDQ
D11
Q11
Q2
M
D33
Q34
D25
VSS
VSS
VSS
VSS
VSS
D10
Q1
D2
N
D34
D26
Q25
VSS
A
A
A
VSS
Q10
D9
D1
P
Q35
D35
Q26
A
A
QVLD
A
A
Q9
D0
Q0
R
TDO
TCK
A
A
A
NC
A
A
A
TMS
TDI
Note
1. NC/144M and NC/288M are not connected to the die and can be tied to any voltage level.
Document Number: 001-60006 Rev. *M
Page 5 of 34
CYRS1542AV18
CYRS1544AV18
Pin Definitions
Pin Name
I/O
Pin Description
D[x:0]
InputData input signals. Sampled on the rising edge of K and K clocks during valid write operations.
Synchronous CYRS1542AV18 D[17:0]
CYRS1544AV18 D[35:0]
WPS
InputWrite port select Active LOW. Sampled on the rising edge of the K clock. When asserted active, a
Synchronous write operation is initiated. Deasserting deselects the write port. Deselecting the write port ignores D[x:0].
BWS0,
BWS1,
BWS2,
BWS3
InputByte write select (BWS) 0, 1, 2, and 3 Active LOW. Sampled on the rising edge of the K and K clocks
Synchronous during write operations. Used to select which byte is written into the device during the current portion of
the write operations. Bytes not written remain unaltered.
CYRS1542AV18 BWS0 controls D[8:0] and BWS1 controls D[17:9].
CYRS1544AV18 BWS0 controls D[8:0], BWS1 controls D[17:9], BWS2 controls D[26:18] and BWS3
controls D[35:27].
All the BWS are sampled on the same edge as the data. Deselecting a BWS ignores the corresponding
byte of data and it is not written into the device.
A[x:0]
InputAddress inputs. Sampled on the rising edge of the K (read address) and K (write address) clocks during
Synchronous active read and write operations. These address inputs are multiplexed for both read and write
operations. Internally, the device is organized as 4 M × 18 (2 arrays each of 2 M × 18) for
CYRS1542AV18, and 2 M × 36 (2 arrays each of 1 M × 36) for CYRS1544AV18. Therefore, only 21
address inputs are needed to access the entire memory array of CYRS1542AV18, and 20 address inputs
for CYRS1544AV18. These inputs are ignored when the appropriate port is deselected.
Q[x:0]
OutputData output signals. These pins drive out the requested data during a read operation. Valid data is
Synchronous driven out on the rising edge of the K and K clock. When the read port is deselected, Q[x:0] are
automatically tristated.
CYRS1542AV18 Q[17:0]
CYRS1544AV18 Q[35:0]
RPS
InputRead port select Active LOW. Sampled on the rising edge of positive input clock (K). When active,
Synchronous a read operation is initiated. Deasserting deselects the read port. When deselected, the pending access
is allowed to complete and the output drivers are automatically tristated following the next rising edge of
the K clock. Each read access consists of a burst of four sequential transfers.
QVLD
Valid Output Valid output indicator. The Q Valid indicates valid output data. QVLD is edge aligned with CQ and CQ.
Indicator
K
Input Clock
Positive input clock input. The rising edge of K is used to capture synchronous inputs to the device
and to drive out data through Q[x:0] when in single clock mode. All accesses are initiated on the rising
edge of K.
K
Input Clock
Negative input clock input. K is used to capture synchronous inputs being presented to the device and
to drive out data through Q[x:0] when in single clock mode.
CQ
Echo Clock
Synchronous echo clock outputs. This is a free running clock and is synchronized to the input clock
K. The timing for the echo clocks is shown in Switching Characteristics on page 25.
CQ
Echo Clock
Synchronous echo clock outputs. This is a free running clock and is synchronized to the input clock
K. The timing for the echo clocks is shown in the Switching Characteristics on page 25.
ZQ
Input
Output impedance matching input. This input is used to tune the device outputs to the system data
bus impedance. CQ, CQ, and Q[x:0] output impedance are set to 0.2 × RQ, where RQ is a resistor
connected between ZQ and ground. Alternatively, connect this pin directly to VDDQ, which enables the
minimum impedance mode. This pin cannot be connected directly to GND or left unconnected.
DOFF
Input
DLL turn off Active LOW. Connecting this pin to ground turns off the DLL inside the device. The timing
in the operation with the DLL turned off differs from those listed in this data sheet. For normal operation,
connect this pin to a pull up through a 10 k or less pull up resistor. The device behaves in QDR I mode
when the DLL is turned off. In this mode, the device can be operated at a frequency of up to 167 MHz
with QDR I timing.
TDO
Output
Test data out (TDO) Pin for JTAG.
Document Number: 001-60006 Rev. *M
Page 6 of 34
CYRS1542AV18
CYRS1544AV18
Pin Definitions (continued)
Pin Name
I/O
Pin Description
TCK
Input
Test clock (TCK) Pin for JTAG.
TDI
Input
Test data in (TDI) Pin for JTAG.
TMS
Input
Test mode select (TMS) Pin for JTAG.
NC
N/A
Not connected to the die. Can be tied to any voltage level.
NC/144M
Input
Not connected to the die. Can be tied to any voltage level.
NC/288M
Input
Not connected to the die. Can be tied to any voltage level.
VREF
VDD
VSS
VDDQ
InputReference
Reference voltage input. Static input used to set the reference level for HSTL inputs, outputs, and AC
measurement points.
Power Supply Power supply inputs to the core of the device.
Ground
Ground for the device.
Power Supply Power supply inputs for the outputs of the device.
Document Number: 001-60006 Rev. *M
Page 7 of 34
CYRS1542AV18
CYRS1544AV18
Functional Overview
Write Operations
The CYRS1542AV18, and CYRS1544AV18 are synchronous
pipelined burst SRAMs with a read port and a write port. The read
port is dedicated to read operations and the write port is
dedicated to write operations. Data flows into the SRAM through
the write port and flows out through the read port. These devices
multiplex the address inputs to minimize the number of address
pins required. By having separate read and write ports, the
QDR II+ completely eliminates the need to turnaround the data
bus and avoids any possible data contention, thereby simplifying
system design. Each access consists of two 18-bit data transfers
in the case of CYRS1542AV18, and two 36-bit data transfers in
the case of CYRS1544AV18 in one clock cycle.
This device operates with a read latency of two cycles when
DOFF pin is tied HIGH. When DOFF pin is set LOW or connected
to VSS then the device behaves in QDR I mode with a read
latency of one clock cycle. DOFF is not a recommended mode
of operation.
Accesses for both ports are initiated on the rising edge of the
positive input clock (K). All synchronous input timing is
referenced from the rising edge of the input clocks (K and K) and
all output timing is referenced to the output clocks (K and K).
All synchronous data inputs (D[x:0]) pass through input registers
controlled by the input clocks (K and K). All synchronous data
outputs (Q[x:0]) pass through output registers controlled by the
rising edge of the output clocks (K and K).
All synchronous control (RPS, WPS, BWS[x:0]) inputs pass
through input registers controlled by the rising edge of the input
clocks (K and K).
CYRS1542AV18 is described below. The
descriptions also apply to CYRS1544AV18.
same
basic
Read Operations
The CYRS1542AV18 is organized internally as two arrays of
2 M × 18. Accesses are completed in a burst of two sequential
18-bit data words. Read operations are initiated by asserting
RPS active at the rising edge of the positive input clock (K). The
address is latched on the rising edge of the K clock. The address
presented to the address inputs is stored in the read address
register. Following the next two K clock rising edges, the
corresponding lower order 18-bit word of data is driven onto the
Q[17:0] using K as the output timing reference. On the
subsequent rising edge of K, the next 18-bit data word is drive
onto the Q[17:0]. The requested data is valid 0.45 ns from the
rising edge of the output clock (K or K).
When the read port is deselected, the CYRS1542AV18 first
completes the pending read transactions. Synchronous internal
circuitry automatically tri-states the outputs following the next
rising edge of the positive input clock (K).
Document Number: 001-60006 Rev. *M
Write operations are initiated by asserting WPS active at the
rising edge of the positive input clock (K). On the same K clock
rise the data presented to D[17:0] is latched and stored into the
lower 18-bit write data register, provided BWS[1:0] are both
asserted active. On the subsequent rising edge of the negative
input clock (K), the address is latched in and the information
presented to D[17:0] is stored into the higher 18-bit write data
register, provided BWS[1:0] are both asserted active. The 36 bits
of data are then written into the memory array at the specified
location.
When deselected, the write port ignores all inputs after the
pending write operations are complete.
Byte Write Operations
Byte write operations are supported by the CYRS1542AV18. A
write operation is initiated as described in the Write Operations
section. The bytes that are written are determined by BWS0 and
BWS1, which are sampled with each set of 18-bit data words.
Asserting the appropriate BWS input during the data portion of a
write latches the data being presented and writes it into the
device. Deasserting the byte write select input during the data
portion of a write enables the data stored in the device for that
byte to remain unaltered. This feature can be used to simplify
read, modify, or write operations to a byte write operation.
Concurrent Transactions
The read and write ports on the CYRS1542AV18 operate
independently of one another. As each port latches the address
inputs on different clock edges, you can read or write to any
location, regardless of the transaction on the other port. You can
start reads and writes in the same clock cycle. If the ports access
the same location at the same time, the SRAM delivers the most
recent information associated with the specified address
location. This includes forwarding data from a write cycle that
was initiated on the previous K clock rise.
Depth Expansion
The CYRS1542AV18 has a port select input for each port. This
allows for easy depth expansion. Both port selects are sampled
on the rising edge of the positive input clock only (K). Each port
select input can deselect the specified port. Deselecting one port
does not affect the other port. All pending transactions (read and
write) are completed before the device is deselected.
Programmable Impedance
An external resistor, RQ, must be connected between the ZQ pin
on the SRAM and VSS to enable the SRAM to adjust its output
driver impedance. The value of RQ must be 5 × the value of the
intended line impedance driven by the SRAM. The allowable
range of RQ to guarantee impedance matching with a tolerance
of ±15% is between 175 and 350 , with VDDQ = 1.5 V. The
output impedance is adjusted every 1024 cycles upon power-up
to account for drifts in supply voltage and temperature.
Page 8 of 34
CYRS1542AV18
CYRS1544AV18
Echo Clocks
Qualification and Screening
Echo clocks are provided on the QDR II+ to simplify data capture
on high speed systems. Two echo clocks are generated by the
QDRII+. CQ is referenced with respect to K and CQb is
referenced with respect to K. These are free-running clocks and
are synchronized to the input clock of the QDR II+. The timing
for the echo clocks is shown in Switching Characteristics on page
25.
The 90-nm RadStop technology was qualified by Cypress after
meeting the criteria of the General Manufacturing Standards.
The test flow includes screening units with the defined flow
(Class Q, Class V) and the appropriate periodic or lot
conformance testing (Groups B, C, D, and E). Both the 90-nm
process and the SRAM products are subject to period or
lot-based technology conformance inspection (TCI) and quality
conformance inspection (QCI) tests, respectively. Cypress offers
both prototyping models and flight units of these product
configurations.
Valid Data Indicator (QVLD)
QVLD is provided on the QDR II+ to simplify data capture on high
speed systems. The QVLD is generated by the QDR II+ device
along with data output. This signal is also edge-aligned with the
echo clock and follows the timing of any data pin. This signal is
asserted half a cycle before valid data arrives.
Table 1. Qualification Tests
Group A
General electrical tests
Group B
Mechanical - Dimensions,
bond strength, solvents, die
shear, solderability, lead
Integrity, seal, and
acceleration
Group C
Life tests - 1000 hours at
125 C or equivalent
Group D
Package related mechanical
tests - shock, vibration, accel,
salt, seal, lead finish adhesion,
lid torque, thermal shock, and
moisture resistance
Group E
Radiation tests
DLL
These chips use a DLL that is designed to function between
120 MHz and the specified maximum clock frequency. During
power-up, when the DOFF is tied HIGH, the DLL is locked after
10240 cycles of stable clock. The DLL can also be reset by
slowing or stopping the input clocks K and K for a minimum of
30 ns. The DLL may be disabled by applying ground to the DOFF
pin. When the DLL is turned off, the device behaves in QDR I
mode (with one cycle latency and a longer access time). For
information refer to the application note AN5062, DLL Considerations in QDRII/DDRII.
Document Number: 001-60006 Rev. *M
Page 9 of 34
CYRS1542AV18
CYRS1544AV18
Application Example
Figure 2 shows two QDR II+ used in an application.
Figure 2. Application Example
ZQ
ZQ
SRAM#1
D[x:0]
A
RPS
WPS
CQ/CQ
Q[x:0]
BWS K K
SRAM#2
RQ
D[x:0]
A
RPS
WPS
CQ/CQ
Q[x:0]
BWS K K
RQ
DATA IN[2x:0]
DATA OUT [2x:0]
ADDRESS
RPS
WPS
BWS
CLKIN1/CLKIN1
CLKIN2/CLKIN2
SOURCE K
SOURCE K
FPGA / ASIC
Document Number: 001-60006 Rev. *M
Page 10 of 34
CYRS1542AV18
CYRS1544AV18
Truth Table
CYRS1542AV18 and CYRS1544AV18 [2, 3, 4, 5, 6, 7]
Operation
K
RPS WPS
DQ
DQ
Write cycle:
Load address on the rising edge of K;
input write data on K and K rising edges.
L–H
X
L
D(A) at K(t)
D(A + 1) at K(t)
Read cycle:(2.0 cycle Latency)
Load address on the rising edge of K;
wait two cycles; read data on K and K rising edges.
L–H
L
X
Q(A) at K(t + 2)
Q(A + 1) at K(t + 2)
NOP: No operation
L–H
H
H
D=X
Q = High Z
D=X
Q = High Z
Stopped
X
X
Previous state
Previous state
Standby: Clock stopped
Write Cycle Descriptions
CYRS1542AV18 [2, 8]
BWS0
BWS1
K
K
L
L
L–H
–
L
L
–
L
H
L–H
L
H
–
H
L
L–H
H
L
–
H
H
L–H
H
H
–
Comments
During the data portion of a write sequence Both bytes (D[17:0]) are written into the device.
L–H During the data portion of a write sequence: Both bytes (D[17:0]) are written into the device.
–
During the data portion of a write sequence
Only the lower byte (D[8:0]) is written into the device, D[17:9] remains unaltered.
L–H During the data portion of a write sequence
Only the lower byte (D[8:0]) is written into the device, D[17:9] remains unaltered.
–
During the data portion of a write sequence
Only the upper byte (D[17:9]) is written into the device, D[8:0] remains unaltered.
L–H During the data portion of a write sequence
Only the upper byte (D[17:9]) is written into the device, D[8:0] remains unaltered.
–
No data is written into the devices during this portion of a write operation.
L–H No data is written into the devices during this portion of a write operation.
Notes
2. X = “Don't Care,” H = Logic HIGH, L = Logic LOW, represents rising edge.
3. Device powers up deselected with the outputs in a tristate condition.
4. “A” represents address location latched by the devices when transaction was initiated. A + 0, A + 1 represents the internal address sequence in the burst.
5. “t” represents the cycle at which a Read/Write operation is started. t + 1, and t + 2 are the first, and second clock cycles respectively succeeding the “t” clock cycle.
6. Data inputs are registered at K and K rising edges. Data outputs are delivered on K and K rising edges.
7. It is recommended that K = K = HIGH when clock is stopped. This is not essential, but permits most rapid restart by overcoming transmission line charging symmetrically.
8. Is based on a write cycle that was initiated in accordance with the Write Cycle Descriptions table. BWS0, BWS1, BWS2 and BWS2 can be altered on different portions
of a write cycle, as long as the setup and hold requirements are achieved.
Document Number: 001-60006 Rev. *M
Page 11 of 34
CYRS1542AV18
CYRS1544AV18
Write Cycle Descriptions
CYRS1544AV18 [9, 10]
BWS0
BWS1
BWS2
BWS3
K
K
Comments
L
L
L
L
L–H
–
During the data portion of a write sequence, all four bytes (D[35:0]) are written into
the device.
L
L
L
L
–
L
H
H
H
L–H
L
H
H
H
–
H
L
H
H
L–H
H
L
H
H
–
H
H
L
H
L–H
H
H
L
H
–
H
H
H
L
L–H
H
H
H
L
–
H
H
H
H
L–H
H
H
H
H
–
L–H During the data portion of a write sequence, all four bytes (D[35:0]) are written into
the device.
–
During the data portion of a write sequence, only the lower byte (D[8:0]) is written
into the device. D[35:9] remains unaltered.
L–H During the data portion of a write sequence, only the lower byte (D[8:0]) is written
into the device. D[35:9] remains unaltered.
–
During the data portion of a write sequence, only the byte (D[17:9]) is written into the
device. D[8:0] and D[35:18] remains unaltered.
L–H During the data portion of a write sequence, only the byte (D[17:9]) is written into the
device. D[8:0] and D[35:18] remains unaltered.
–
During the data portion of a write sequence, only the byte (D[26:18]) is written into
the device. D[17:0] and D[35:27] remains unaltered.
L–H During the data portion of a write sequence, only the byte (D[26:18]) is written into
the device. D[17:0] and D[35:27] remains unaltered.
–
During the data portion of a write sequence, only the byte (D[35:27]) is written into
the device. D[26:0] remains unaltered.
L–H During the data portion of a write sequence, only the byte (D[35:27]) is written into
the device. D[26:0] remains unaltered.
–
No data is written into the device during this portion of a write operation.
L–H No data is written into the device during this portion of a write operation.
Notes
9. X = “Don't Care,” H = Logic HIGH, L = Logic LOW, represents rising edge.
10. Is based on a write cycle that was initiated in accordance with the Write Cycle Descriptions table. BWS0, BWS1, BWS2 and BWS2 can be altered on different portions
of a write cycle, as long as the setup and hold requirements are achieved
Document Number: 001-60006 Rev. *M
Page 12 of 34
CYRS1542AV18
CYRS1544AV18
IEEE 1149.1 Serial Boundary Scan (JTAG)
These SRAMs incorporate a serial boundary scan Test Access
Port (TAP) in the FBGA package. This part is fully compliant with
IEEE Standard #1149.1-2001. The TAP operates using JEDEC
standard 1.8 V I/O logic levels.
Disabling the JTAG Feature
It is possible to operate the SRAM without using the JTAG
feature. To disable the TAP controller, TCK must be tied LOW
(VSS) to prevent clocking of the device. TDI and TMS are
internally pulled up and may be unconnected. They may
alternatively be connected to VDD through a pull up resistor. TDO
must be left unconnected. Upon power up, the device comes up
in a reset state, which does not interfere with the operation of the
device.
Test Access Port
Test Clock
The test clock is used only with the TAP controller. All inputs are
captured on the rising edge of TCK. All outputs are driven from
the falling edge of TCK.
Test Mode Select (TMS)
The TMS input is used to give commands to the TAP controller
and is sampled on the rising edge of TCK. This pin may be left
unconnected if the TAP is not used. The pin is pulled up
internally, resulting in a logic HIGH level.
Test Data In (TDI)
The TDI pin is used to serially input information into the registers
and can be connected to the input of any of the registers. The
register between TDI and TDO is chosen by the instruction that
is loaded into the TAP instruction register. For information on
loading the instruction register, see the TAP Controller State
Diagram on page 15. TDI is internally pulled up and can be
unconnected if the TAP is unused in an application. TDI is
connected to the most significant bit (MSB) on any register.
Test Data Out (TDO)
The TDO output pin is used to serially clock data out from the
registers. The output is active, depending upon the current state
of the TAP state machine (see Instruction Codes on page 19).
The output changes on the falling edge of TCK. TDO is
connected to the least significant bit (LSB) of any register.
Performing a TAP Reset
A reset is performed by forcing TMS HIGH (VDD) for five rising
edges of TCK. This reset does not affect the operation of the
SRAM and can be performed while the SRAM is operating. At
power up, the TAP is reset internally to ensure that TDO comes
up in a high Z state.
TAP Registers
Registers are connected between the TDI and TDO pins to scan
the data in and out of the SRAM test circuitry. Only one register
can be selected at a time through the instruction registers. Data
is serially loaded into the TDI pin on the rising edge of TCK. Data
is output on the TDO pin on the falling edge of TCK.
Document Number: 001-60006 Rev. *M
Instruction Register
Three-bit instructions can be serially loaded into the instruction
register. This register is loaded when it is placed between the TDI
and TDO pins, as shown in TAP Controller Block Diagram on
page 16. At power up, the instruction register is loaded with the
IDCODE instruction. It is also loaded with the IDCODE
instruction if the controller is placed in a reset state, as described
in the previous section.
When the TAP controller is in the Capture-IR state, the two least
significant bits are loaded with a binary “01” pattern to allow for
fault isolation of the board level serial test path.
Bypass Register
To save time when serially shifting data through registers, it is
sometimes advantageous to skip certain chips. The bypass
register is a single-bit register that can be placed between TDI
and TDO pins. This enables shifting of data through the SRAM
with minimal delay. The bypass register is set LOW (VSS) when
the BYPASS instruction is executed.
Boundary Scan Register
The boundary scan register is connected to all of the input and
output pins on the SRAM. Several no connect (NC) pins are also
included in the scan register to reserve pins for higher density
devices.
The boundary scan register is loaded with the contents of the
RAM input and output ring when the TAP controller is in the
Capture-DR state and is then placed between the TDI and TDO
pins when the controller is moved to the Shift-DR state. The
EXTEST, SAMPLE/PRELOAD, and SAMPLE Z instructions can
be used to capture the contents of the input and output ring.
The Boundary Scan Order on page 20 shows the order in which
the bits are connected. Each bit corresponds to one of the bumps
on the SRAM package. The MSB of the register is connected to
TDI, and the LSB is connected to TDO.
Identification (ID) Register
The ID register is loaded with a vendor specific, 32-bit code
during the Capture-DR state when the IDCODE command is
loaded in the instruction register. The IDCODE is hardwired into
the SRAM and can be shifted out when the TAP controller is in
the Shift-DR state. The ID register has a vendor code and other
information described in Identification Register Definitions on
page 19.
TAP Instruction Set
Eight different instructions are possible with the three-bit
instruction register. All combinations are listed in Instruction
Codes on page 19. Three of these instructions are listed as
RESERVED and must not be used. The other five instructions
are described in this section in detail.
Instructions are loaded into the TAP controller during the Shift-IR
state when the instruction register is placed between TDI and
TDO. During this state, instructions are shifted through the
instruction register through the TDI and TDO pins. To execute
the instruction after it is shifted in, the TAP controller must be
moved into the Update-IR state.
Page 13 of 34
CYRS1542AV18
CYRS1544AV18
IDCODE
BYPASS
The IDCODE instruction loads a vendor specific, 32-bit code into
the instruction register. It also places the instruction register
between the TDI and TDO pins and shifts the IDCODE out of the
device when the TAP controller enters the Shift-DR state. The
IDCODE instruction is loaded into the instruction register at
power up or whenever the TAP controller is supplied a
Test-Logic-Reset state.
When the BYPASS instruction is loaded in the instruction register
and the TAP is placed in a Shift-DR state, the bypass register is
placed between the TDI and TDO pins. The advantage of the
BYPASS instruction is that it shortens the boundary scan path
when multiple devices are connected together on a board.
SAMPLE Z
The SAMPLE Z instruction connects the boundary scan register
between the TDI and TDO pins when the TAP controller is in a
Shift-DR state. The SAMPLE Z command puts the output bus
into a high Z state until the next command is supplied during the
Update IR state.
SAMPLE/PRELOAD
SAMPLE/PRELOAD is an 1149.1 mandatory instruction. When
the SAMPLE/PRELOAD instructions are loaded into the
instruction register and the TAP controller is in the Capture-DR
state, a snapshot of data on the input and output pins is captured
in the boundary scan register.
You must be aware that the TAP controller clock only operates
at a frequency up to 20 MHz, while the SRAM clock operates
more than an order of magnitude faster. Because there is a large
difference in the clock frequencies, it is possible that during the
Capture-DR state, an input or output undergoes a transition. The
TAP may then try to capture a signal while in transition
(metastable state). This does not harm the device, but there is
no guarantee as to the value that is captured. Repeatable results
may not be possible.
To guarantee that the boundary scan register captures the
correct value of a signal, the SRAM signal must be stabilized
long enough to meet the TAP controller’s capture setup plus hold
times (tCS and tCH). The SRAM clock input might not be captured
correctly if there is no way in a design to stop (or slow) the clock
during a SAMPLE/PRELOAD instruction. If this is an issue, it is
still possible to capture all other signals and simply ignore the
value of the K and K captured in the boundary scan register.
EXTEST
The EXTEST instruction drives the preloaded data out through
the system output pins. This instruction also connects the
boundary scan register for serial access between the TDI and
TDO in the Shift-DR controller state.
EXTEST OUTPUT BUS TRISTATE
IEEE Standard 1149.1 mandates that the TAP controller be able
to put the output bus into a tristate mode.
The boundary scan register has a special bit located at bit #108.
When this scan cell, called the “extest output bus tristate,” is
latched into the preload register during the Update-DR state in
the TAP controller, it directly controls the state of the output
(Q-bus) pins, when the EXTEST is entered as the current
instruction. When HIGH, it enables the output buffers to drive the
output bus. When LOW, this bit places the output bus into a
high Z condition.
This bit can be set by entering the SAMPLE/PRELOAD or
EXTEST command, and then shifting the desired bit into that cell,
during the Shift-DR state. During Update-DR, the value loaded
into that shift-register cell latches into the preload register. When
the EXTEST instruction is entered, this bit directly controls the
output Q-bus pins. Note that this bit is preset LOW to enable the
output when the device is powered up, and also when the TAP
controller is in the Test Logic Reset state.
Reserved
These instructions are not implemented but are reserved for
future use. Do not use these instructions.
After the data is captured, it is possible to shift out the data by
putting the TAP into the Shift-DR state. This places the boundary
scan register between the TDI and TDO pins.
PRELOAD places an initial data pattern at the latched parallel
outputs of the boundary scan register cells before the selection
of another boundary scan test operation.
The shifting of data for the SAMPLE and PRELOAD phases can
occur concurrently when required, that is, while the data
captured is shifted out, the preloaded data can be shifted in.
Document Number: 001-60006 Rev. *M
Page 14 of 34
CYRS1542AV18
CYRS1544AV18
TAP Controller State Diagram
The state diagram for the TAP controller follows. [11]
1
TEST-LOGIC
RESET
0
0
TEST-LOGIC/
IDLE
1
SELECT
DR-SCAN
1
1
SELECT
IR-SCAN
0
0
1
1
CAPTURE-DR
CAPTURE-IR
0
0
SHIFT-DR
0
SHIFT-IR
1
1
EXIT1-DR
1
EXIT1-IR
0
1
0
PAUSE-DR
0
PAUSE-IR
1
0
1
0
EXIT2-DR
0
EXIT2-IR
1
1
UPDATE-IR
UPDATE-DR
1
0
0
1
0
Note
11. The 0/1 next to each state represents the value at TMS at the rising edge of TCK.
Document Number: 001-60006 Rev. *M
Page 15 of 34
CYRS1542AV18
CYRS1544AV18
TAP Controller Block Diagram
0
Bypass Register
2
Selection
Circuitry
TDI
1
0
Selection
Circuitry
Instruction Register
31
30
29
.
.
2
1
0
1
0
TDO
Identification Register
108
.
.
.
.
2
Boundary Scan Register
TCK
TAP Controller
TMS
TAP Electrical Characteristics
Over the Operating Range
Parameter [12, 13, 14]
Description
Test Conditions
Min
Max
Unit
VOH1
Output high voltage
IOH =2.0 mA
1.4
–
V
VOH2
Output high voltage
IOH =100 A
1.6
–
V
VOL1
Output low voltage
IOL = 2.0 mA
–
0.4
V
VOL2
Output low voltage
IOL = 100 A
–
0.2
V
VIH
Input high voltage
VIL
Input low voltage
IX
Input and output load current
0.65 × VDD VDD + 0.3
GND VI VDD
V
–0.3
0.35 × VDD
V
–5
5
A
Notes
12. These characteristics pertain to the TAP inputs (TMS, TCK, TDI and TDO). Parallel load levels are specified in Electrical Characteristics on page 22.
13. Overshoot: VIH(AC) < VDDQ + 0.85 V (Pulse width less than tCYC/2), Undershoot: VIL(AC) > 1.5 V (Pulse width less than tCYC/2).
14. All Voltage referenced to ground.
Document Number: 001-60006 Rev. *M
Page 16 of 34
CYRS1542AV18
CYRS1544AV18
TAP AC Switching Characteristics
Over the Operating Range
Parameter [15, 16]
Description
Min
Max
Unit
50
–
ns
TCK clock frequency
–
20
MHz
TCK clock HIGH
20
–
ns
TCK clock LOW
20
–
ns
tTCYC
TCK clock cycle time
tTF
tTH
tTL
Setup Times
tTMSS
TMS setup to TCK clock rise
5
–
ns
tTDIS
TDI setup to TCK clock rise
5
–
ns
tCS
Capture setup to TCK rise
5
–
ns
Hold Times
tTMSH
TMS hold after TCK clock rise
5
–
ns
tTDIH
TDI hold after clock rise
5
–
ns
tCH
Capture hold after clock rise
5
–
ns
Output Times
tTDOV
TCK clock LOW to TDO valid
–
10
ns
tTDOX
TCK clock LOW to TDO invalid
0
–
ns
Notes
15. tCS and tCH refer to the setup and hold time requirements of latching data from the boundary scan register.
16. Test conditions are specified using the load in TAP AC Test Conditions. tR/tF = 1 ns.
Document Number: 001-60006 Rev. *M
Page 17 of 34
CYRS1542AV18
CYRS1544AV18
TAP Timing and Test Conditions
Figure 3 shows the TAP timing and test conditions. [17]
Figure 3. TAP Timing and Test Conditions
0.9 V
ALL INPUT PULSES
1.8 V
0.9 V
50
TDO
0V
Z0 = 50
(a)
CL = 20 pF
tTH
GND
tTL
Test Clock
TCK
tTMSH
tTMSS
tTCYC
Test Mode Select
TMS
tTDIS
tTDIH
Test Data In
TDI
Test Data Out
TDO
tTDOV
tTDOX
Note
17. Test conditions are specified using the load in TAP AC Test Conditions. tR/tF = 1 ns.
Document Number: 001-60006 Rev. *M
Page 18 of 34
CYRS1542AV18
CYRS1544AV18
Identification Register Definitions
Value
Instruction Field
CYRS1542AV18
CYRS1544AV18
000
000
Cypress device ID (28:12)
11010010100010100
11010010100100100
Cypress JEDEC ID (11:1)
00000110100
00000110100
1
1
Revision number (31:29)
ID register presence (0)
Description
Version number.
Defines the type of SRAM.
Allows unique identification of
SRAM vendor.
Indicates the presence of an ID
register.
Scan Register Sizes
Register Name
Bit Size
Instruction
3
Bypass
1
ID
32
Boundary Scan
109
Instruction Codes
Instruction
Code
Description
EXTEST
000
Captures the input and output ring contents.
IDCODE
001
Loads the ID register with the vendor ID code and places the register between TDI and TDO.
This operation does not affect SRAM operation.
SAMPLE Z
010
Captures the input and output contents. Places the boundary scan register between TDI and
TDO. Forces all SRAM output drivers to a high Z state.
RESERVED
011
Do Not Use: This instruction is reserved for future use.
SAMPLE/PRELOAD
100
Captures the input and output contents. Places the boundary scan register between TDI and
TDO. Does not affect the SRAM operation.
RESERVED
101
Do Not Use: This instruction is reserved for future use.
RESERVED
110
Do Not Use: This instruction is reserved for future use.
BYPASS
111
Places the bypass register between TDI and TDO. This operation does not affect SRAM
operation.
Document Number: 001-60006 Rev. *M
Page 19 of 34
CYRS1542AV18
CYRS1544AV18
Boundary Scan Order
Bit #
Bump ID
Bit #
Bump ID
Bit #
Bump ID
Bit #
Bump ID
0
6R
28
10G
56
6A
84
1J
1
6P
29
9G
57
5B
85
2J
2
6N
30
11F
58
5A
86
3K
3
7P
31
11G
59
4A
87
3J
4
7N
32
9F
60
5C
88
2K
5
7R
33
10F
61
4B
89
1K
6
8R
34
11E
62
3A
90
2L
7
8P
35
10E
63
2A
91
3L
8
9R
36
10D
64
1A
92
1M
9
11P
37
9E
65
2B
93
1L
10
10P
38
10C
66
3B
94
3N
11
10N
39
11D
67
1C
95
3M
12
9P
40
9C
68
1B
96
1N
13
10M
41
9D
69
3D
97
2M
14
11N
42
11B
70
3C
98
3P
15
9M
43
11C
71
1D
99
2N
16
9N
44
9B
72
2C
100
2P
17
11L
45
10B
73
3E
101
1P
18
11M
46
11A
74
2D
102
3R
19
9L
47
10A
75
2E
103
4R
20
10L
48
9A
76
1E
104
4P
21
11K
49
8B
77
2F
105
5P
22
10K
50
7C
78
3F
106
5N
23
9J
51
6C
79
1G
107
5R
24
9K
52
8A
80
1F
108
Internal
25
10J
53
7A
81
3G
26
11J
54
7B
82
2G
27
11H
55
6B
83
1H
Document Number: 001-60006 Rev. *M
Page 20 of 34
CYRS1542AV18
CYRS1544AV18
Power Up Sequence in QDR II+ SRAM
QDR II+ SRAMs must be powered up and initialized in a
predefined manner to prevent undefined operations.
Power Up Sequence
■
Apply power and drive DOFF either HIGH or LOW (All other
inputs can be HIGH or LOW).
❐ Apply VDD before VDDQ.
❐ Apply VDDQ before VREF or at the same time as VREF.
❐ Drive DOFF HIGH.
■
Provide stable DOFF (HIGH), power and clock (K, K) for 10240
cycles to lock the DLL.
DLL Constraints
■
DLL uses K clock as its synchronizing input. The input must
have low phase jitter, which is specified as tKC Var.
■
The DLL functions at frequencies down to 120 MHz.
■
If the input clock is unstable and the DLL is enabled, then the
DLL may lock onto an incorrect frequency, causing unstable
SRAM behavior. To avoid this, provide 10240 cycles stable
clock to relock to the desired clock frequency.
~
~
Figure 4. Power Up Waveforms
K
~
~
K
Unstable Clock
> 10240 Stable Clock
Start Normal
Operation
Clock Start (Clock Starts after VDD/VDDQ is Stable)
VDD/VDDQ
DOFF
Document Number: 001-60006 Rev. *M
VDD/VDDQ Stable (< + 0.1V DC per 50 ns)
Fix HIGH (tie to VDDQ)
Page 21 of 34
CYRS1542AV18
CYRS1544AV18
DC input voltage [18] ........................... –0.5 V to VDD + 0.5 V
Maximum Ratings
Exceeding maximum ratings may impair the useful life of the
device. These user guidelines are not tested.
Storage temperature ................................ –65 °C to +150 °C
Case temperature under power ............... –55 °C to +125 °C
Junction temperature under power ........... –55 °C to +150°C
Current into outputs (LOW) ........................................ 20 mA
Static discharge voltage
(MIL-STD-883, TM. 3015) ...................................... > 2001 V
Latch up current ..................................................... > 200 mA
Operating Range
Supply voltage on VDD relative to GND .......–0.5 V to +2.9 V
Supply voltage on VDDQ relative to GND ...... –0.5 V to +VDD
DC applied to outputs in high Z ........ –0.5 V to VDDQ + 0.5 V
Range
Military
Case Temperature
(Tc)
VDD[19]
VDDQ[19]
–55 °C to +125 °C
1.8 ± 0.1 V
1.4 V to VDD
Electrical Characteristics
Over the Operating Range
DC Electrical Characteristics
Over the Operating Range
Parameter [20]
Description
Test Conditions
Min
Typ
Max
Unit
VDD
Power supply voltage
1.7
1.8
1.9
V
VDDQ
I/O supply voltage
1.4
1.5
VDD
V
VOH
Output high voltage
Note 21
VDDQ/2 – 0.12
–
VDDQ/2 + 0.12
V
VOL
Output low voltage
Note 22
VDDQ/2 – 0.12
–
VDDQ/2 + 0.12
V
VOH(LOW)
Output high voltage
IOH =0.1 mA, nominal impedance
VDDQ – 0.2
–
VDDQ
V
VOL(LOW)
Output low voltage
IOL = 0.1 mA, nominal impedance
VSS
–
0.2
V
VIH
Input high voltage
VREF + 0.1
–
VDDQ + 0.3
V
VIL
Input low voltage
–0.3
–
VREF – 0.1
V
IX
Input leakage current
GND VI VDDQ
20
–
20
A
IOZ
Output leakage current
GND VI VDDQ, output disabled
20
–
20
A
Typical value = 0.75 V
0.68
0.75
0.95
V
mA
VREF
IDD
[24]
ISB1
Input reference voltage
VDD operating supply
Automatic power down
current
[23]
VDD = Max,
IOUT = 0 mA,
TJ=125 °C,
f = fMAX = 1/tCYC
250 MHz (× 18)
–
–
1700
(× 36)
–
–
1700
Max VDD,
Both ports deselected,
VIN VIH or VIN VIL,
f = fMAX = 1/tCYC,
TJ = 125 °C,
Inputs static
250 MHz (× 18)
–
–
660
(× 36)
–
–
660
mA
Notes
18. Overshoot: VIH(AC) < VDDQ + 0.85 V (Pulse width less than tCYC/2), Undershoot: VIL(AC) > 1.5 V (Pulse width less than tCYC/2).
19. Power up: Assumes a linear ramp from 0 V to VDD(min) within 200 ms. During this time VIH < VDD and VDDQ < VDD.
20. All Voltage referenced to ground.
21. Output are impedance controlled. IOH = (VDDQ/2)/(RQ/5) for values of 175 < RQ < 350 .
22. Output are impedance controlled. IOL = (VDDQ/2)/(RQ/5) for values of 175 < RQ < 350 .
23. VREF(min) = 0.68 V or 0.46 VDDQ, whichever is larger, VREF(max) = 0.95 V or 0.54 VDDQ, whichever is smaller.
24. The operation current is calculated with concurrent read and write cycles.
Document Number: 001-60006 Rev. *M
Page 22 of 34
CYRS1542AV18
CYRS1544AV18
AC Electrical Characteristics
Over the Operating Range
Parameter [25, 26]
Description
Test Conditions
Min
Typ
Max
Unit
VIH
Input high voltage
VREF + 0.2
–
–
V
VIL
Input low voltage
–
–
VREF – 0.2
V
Radiation Performance
Parameter
Test Conditions
Total dose
TA = 25 °C, VDD = VDDQ = 1.8 V
Soft error rate
TA = 25 °C to 125 °C, VDD = VDDQ = 1.8 V with EDAC
Transient dose
rate upset
Pulse width (FWHM) = 50 ns, X-Ray, TC = 25 °C, VDD = VDDQ = 1.8 V
Neutron fluence
1 MeV equivalent energy, Unbiased TA = 25 C
Latch up
immunity
TA = 125 °C, VDD = VDDQ = 1.9 V
Limits
Unit
300 Krad
Rads(Si) Co60
1.0 × 10^-10
Upsets/bit-day
2.0 ×
109
Rads(Si)/s
2e14
N/cm2
110
MeVcm2/mg
Capacitance
Parameter [27]
Description
Test Conditions
Max
Unit
10
pF
CIN
Input capacitance
CCLK
Clock input capacitance
10
pF
CO
Output capacitance
10
pF
TA = 25 °C, f = 1 MHz, VDD = 1.8 V, VDDQ = 1.5 V
Thermal Resistance
Parameter [27]
JC
Description
Thermal resistance
(Junction to case)
Test Conditions
Test conditions follow standard test methods and procedures
for measuring thermal impedance, in accordance with
EIA/JESD51.
165-ball CCGA Unit
Package
8.9
°C/W
Notes
25. Overshoot: VIH(AC) < VDDQ + 0.85 V (Pulse width less than tCYC/2), Undershoot: VIL(AC) > 1.5 V (Pulse width less than tCYC/2).
26. Power up: Assumes a linear ramp from 0 V to VDD(min) within 200 ms. During this time VIH < VDD and VDDQ < VDD.
27. Tested initially and after any design or process change that may affect these parameters.
Document Number: 001-60006 Rev. *M
Page 23 of 34
CYRS1542AV18
CYRS1544AV18
AC Test Loads and Waveforms
Figure 5. AC Test Loads and Waveforms
VREF = 0.75 V
VREF
0.75 V
VREF
OUTPUT
DEVICE
UNDER
TEST
Z0 = 50
RL = 50
VREF = 0.75 V
ZQ
R = 50
ALL INPUT PULSES
1.25 V
0.75 V
OUTPUT
DEVICE
UNDER
TEST ZQ
RQ =
250
(a)
0.75 V
INCLUDING
JIG AND
SCOPE
5 pF
[28]
0.25 V
SLEW RATE= 2 V/ns
RQ =
250
(b)
Note
28. Unless otherwise noted, test conditions are based on signal transition time of 2 V/ns, timing reference levels of 0.75 V, Vref = 0.75 V, RQ = 250 , VDDQ = 1.5 V, input
pulse levels of 0.25 V to 1.25 V, and output loading of the specified IOL/IOH and load capacitance shown in (a) of Figure 5.
Document Number: 001-60006 Rev. *M
Page 24 of 34
CYRS1542AV18
CYRS1544AV18
Switching Characteristics
Over the Operating Range
Parameters [29, 30]
250 MHz
Description
Cypress Consortium
Parameter Parameter
Min
VDD(typical) to the first access [31]
tPOWER
Max
Unit
1
–
ms
4.0
8.4
ns
Input clock (K/K) HIGH
1.6
–
ns
Input clock (K/K) LOW
1.6
–
ns
K clock rise to K clock rise (rising edge to rising edge)
1.8
–
ns
tCYC
tKHKH
K clock cycle time
tKH
tKHKL
tKL
tKLKH
tKHKH
tKHKH
Setup Times
tSA
tAVKH
Address setup to K clock rise
0.5
–
ns
tSC
tIVKH
Control setup to K clock rise (RPS, WPS)
0.5
–
ns
tSCDDR
tIVKH
DDR control setup to clock (K/K) rise (BWS0, BWS1, BWS2, BWS3)
0.5
–
ns
tSD
tDVKH
D[X:0] setup to clock (K/K) rise
0.5
–
ns
tHA
tKHAX
Address hold after K clock rise
0.5
–
ns
tHC
tKHIX
Control hold after K clock rise (RPS, WPS)
0.5
–
ns
tHCDDR
tKHIX
DDR control hold after clock (K/K) rise (BWS0, BWS1, BWS2, BWS3)
0.5
–
ns
tHD
tKHDX
D[X:0] hold after clock (K/K) rise
0.5
–
ns
Hold Times
Output Times
tCO
tCHQV
tDOH
tCHQX
Data output hold after output K/K clock rise (Active to active)
tCCQO
tCHCQV
K/K clock rise to echo clock valid
tCQOH
tCHCQX
tCQD
tCQHQV
tCQDOH
tCQHQX
K/K clock rise to data valid
–
0.85
ns
–0.85
–
ns
–
0.85
ns
Echo clock hold after C/C clock rise
Echo clock high to data valid
–0.5
–
ns
–
0.50
ns
Echo clock high to data invalid
–0.30
–
ns
[32]
1.55
–
ns
1.55
–
ns
tCQH
tCQHCQL
Output clock (CQ/CQ) HIGH
tCQHCQH
tCQHCQH
CQ clock rise to CQ clock rise (rising edge to rising edge) [32]
tCHZ
tCHQZ
Clock (K/K) rise to high Z (active to high Z)
tCLZ
tCHQX1
Clock (K/K) rise to low Z [33, 34]
[35]
[33, 34]
–
0.45
ns
–0.45
–
ns
–0.5
0.5
ns
tCQHQVLD
Echo Clock High to QVLD Valid
tKC Var
tKC Var
Clock phase jitter
–
0.20
ns
tKC lock
tKC lock
DLL lock time (K)
10240
–
Cycles
tKC Reset
tKC Reset
K static to DLL reset
30
–
ns
tQVLD
DLL Timing
Notes
29. Unless otherwise noted, test conditions are based on signal transition time of 2 V/ns, timing reference levels of 0.75 V, Vref = 0.75 V, RQ = 250 , VDDQ = 1.5 V,
input pulse levels of 0.25 V to 1.25 V, and output loading of the specified IOL/IOH and load capacitance shown in (a) of Figure 5 on page 24.
30. When a part with a maximum frequency above 167 MHz is operating at a lower clock frequency, it requires the input timings of the frequency range in which it is
being operated and outputs data with the output timings of that frequency range.
31. This part has a voltage regulator internally; tPOWER is the time that the power must be supplied above VDD(minimum) initially before initiating a read or write operation.
32. These parameters are extrapolated from the input timing parameters (tKHKH – 250 ps, where 250 ps is the internal jitter. An input jitter of 200 ps (tKC Var) is already
included in the tKHKH). These parameters are only guaranteed by design and are not tested in production.
33. tCHZ, tCLZ, are specified with a load capacitance of 5 pF as in part (b) of Figure 5 on page 24. Transition is measured 100 mV from steady state voltage.
34. At any voltage and temperature tCHZ is less than tCLZ and tCHZ less than tCO.
35. tQVLD Spec is applicable for both rising and falling edges of QVLD signal.
Document Number: 001-60006 Rev. *M
Page 25 of 34
CYRS1542AV18
CYRS1544AV18
Switching Waveforms
Figure 6. Read/Write/Deselect Sequence [36, 37, 38]
READ
1
WRITE
2
READ
3
READ
5
WRITE
4
NOP
7
WRITE
6
WRITE
8
NOP
9
10
11
12
K
tKH
tKHKH
tCYC
tKL
K
RPS
tSC tHC
WPS
A
D
A0
D10
A1
A2
tSA tHA
tSA tHA
D11
D30
A3
A4
A5
D31
D50
D51
A6
D60
D61
tSD tHD
tSD tHD
tQVLD
QVLD
tQVLD
Q
tCQD
tCO
tCLZ
Q00
tCHZ
tDOH
Q01
Q20
(Read Latency = 2.0 Cycles)
Q21
Q40
Q41
tCQDOH
tCCQO
CQ
tCQH
tCQHCQH
tCQOH
tCCQO
CQ
tCQOH
DON’T CARE
UNDEFINED
Notes
36. Q00 refers to output from address A0. Q01 refers to output from the next internal burst address following A0, that is, A0 + 1.
37. Outputs are disabled (high Z) one clock cycle after a NOP.
38. In this example, if address A0 = A1, then data Q00 = D10 and Q01 = D11. Write data is forwarded immediately as read results. This note applies to Figure 6.
Document Number: 001-60006 Rev. *M
Page 26 of 34
CYRS1542AV18
CYRS1544AV18
Ordering Information
The following table contains only the parts that are currently available. If you do not see what you are looking for (× 18 option), contact
your local sales representative. For more information, visit the Cypress website at www.cypress.com and refer to the product summary
page at http://www.cypress.com/products
Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives and distributors. To find the office
closest to you, visit us at http://www.cypress.com/go/datasheet/offices.
Speed
(MHz)
Ordering Code
Package
Diagram
Description
Package Type
Operating
Range
250
CYRS1542AV18-250GCMB 72M QDR II+, × 18,
Burst of 2
001-58969 165-ball CCGA (21 × 25 × 2.83 mm)
Military
250
CYRS1544AV18-250GCMB 72M QDR II+, × 36,
Burst of 2
001-58969 165-ball CCGA (21 × 25 × 2.83 mm)
Military
250
CYPT1542AV18-250GCMB
72M QDR II+, × 18,
Burst of 2, Prototype
001-58969 165-ball CCGA (21 × 25 × 2.83 mm)
Military
250
CYPT1544AV18-250GCMB
72M QDR II+, × 36,
Burst of 2, Prototype
001-58969 165-ball CCGA (21 × 25 × 2.83 mm)
Military
250
5962F1120101QXA
72M QDR II+, × 18,
Burst of 2, DLAM Part
001-58969 165-ball CCGA (21 × 25 × 2.83 mm)
Military
250
5962F1120101VXA
72M QDR II+, × 18,
Burst of 2, DLAM Part
001-58969 165-ball CCGA (21 × 25 × 2.83 mm)
Military
250
5962F1120201QXA
72M QDR II+, × 36,
Burst of 2, DLAM Part
001-58969 165-ball CCGA (21 × 25 × 2.83 mm)
Military
250
5962F1120201VXA
72M QDR II+, × 36,
Burst of 2, DLAM Part
001-58969 165-ball CCGA (21 × 25 × 2.83 mm)
Military
Ordering Code Definitions
CY XX 154X A V18 - 250 GC M B
Burn-in
Thermal Rating: M = Military
Package Type: GC = 165-ball CCGA
Speed Grade: 250 MHz
Core Voltage: 1.8 V
Die Revision
Part Number Identifier: Density, Organization, Burst
154X = 1542 or 1544
Marketing Code: XX = RS or PT
RS = RadStop, PT = Prototype
Company ID: CY = Cypress
Document Number: 001-60006 Rev. *M
Page 27 of 34
CYRS1542AV18
CYRS1544AV18
Package Diagram
Figure 7. 165-ball Ceramic Column Grid Array (CCGA) (21 × 25 mm) Package Outline, 001-58969
001-58969 *D
Document Number: 001-60006 Rev. *M
Page 28 of 34
CYRS1542AV18
CYRS1544AV18
Acronyms
Acronym
BWS
CCGA
DED
DLL
DDR
DSCC
EDAC
HSTL
I/O
JTAG
LSB
LSBU
LMBU
MSB
PDA
PIND
PDA
QDR
RPS
SEC
SEL
SRAM
TAP
TCK
TDI
TDO
TMS
WPS
Document Conventions
Description
byte write select
ceramic column grid array
double error detection
delay lock loop
double data rate
defense supply center columbus
error detection and correction
high speed transceiver logic
input/output
Joint Test Action Group
least significant bit
logical single-bit upsets
logical multi-bit upsets
most significant bit
percent defect allowable
particle impact noise detection
percent defective allowable
quad data rate
read port select
single error correction
single event latch up
static random access memory
test access port
test clock
test data in
test data out
test mode select
write port select
Document Number: 001-60006 Rev. *M
Units of Measure
Symbol
Unit of Measure
°C
degree Celsius
Krad
kiloradian
MHz
megahertz
µA
microampere
µF
microfarad
µs
microsecond
mA
milliampere
mm
millimeter
ms
millisecond
mV
N/cm
millivolt
2
Neutron particles fluence per cm2 area
ns
nanosecond
nm
nanometer
ohm
%
percent
pF
picofarad
ps
picosecond
Rads(Si)
unit of absorbed radiation energy from ionizing
radiation per kg of material.
(1 rad(Si)) = 10 mGy = 10 – 2 J/kg
V
volt
W
watt
Page 29 of 34
CYRS1542AV18
CYRS1544AV18
Glossary
Total Dose
Permanent device damage due to ions over device life
Heavy Ion
Instantaneous device latch up due to single ion
LET
Linear energy transfer (measured in MeVcm2)
Krad
Unit of measurement to determine device life in radiation environments.
Neutron
Permanent device damage due to energetic neutrons or protons
Prompt Dose
Data loss of permanent device damage due to X-rays and gamma rays < 20 ns
165-ball Ceramic Column Grid
Array
Hermetic ceramic 165-column package. Columns attached by Six Sigma
RadStop Technology
Cypress's patented Rad Hard design methodology
DLAM
Defense Logistics Agency Land and Maritime
LSBU
Logical Single Bit Upset. Single bits in a single correction word are in error.
LMBU
Logical Multi Bit Upset. Multiple bits in a single correction word are in error
Group A
General electrical testing
Group B
Mechanical - Dimensions, bond strength, solvents, die shear, solderability, lead integrity,
seal, acceleration
Group C
Life test - 1000 hours at 125 °C
Group D
Package related mechanical tests - shock, vibration, Accel, salt, seal, lead finish
adhesion, lid torque, thermal shock, moisture resistance
Group E
Radiation testing
Document Number: 001-60006 Rev. *M
Page 30 of 34
CYRS1542AV18
CYRS1544AV18
Document History Page
Document Title: CYRS1542AV18/CYRS1544AV18, 72-Mbit QDR® II+ SRAM Two-Word Burst Architecture with RadStop™
Technology
Document Number: 001-60006
Rev.
ECN No.
Submission
Date
Orig. of
Change
**
2940931
05/31/2010
HRP
New data sheet.
*A
3016545
08/26/2010
HRP
Changed part numbers from CYRS1512AV18/CYRS1514AV18 to reflect
change to QDR II+ die.
Updated Switching Characteristics (Updated minimum and maximum values
for Setup Time, Hold Time parameters, and updated minimum and maximum
values for tCO parameter under Output Time parameter).
Updated Ordering Information (Added 200-MHz part numbers
(CYRS1542AV18-250GCMB, CYRS1544AV18-250GCMB for Burst 2 mode).
Updated Package Diagram.
Added Units of Measure.
*B
3281455
06/13/2011
HRP
Changed status from Advanced to Final.
Updated Configurations (corrected typo).
Updated Selection Guide.
Updated DC Electrical Characteristics (maximum current limit values for the
parameters IDD and ISB1 based on device characterization).
Updated Radiation Performance (Limits of Radiation Data based on RHA
qualification.
Updated Thermal Resistance.
Updated Switching Characteristics (Minimum and Maximum timing values for
the parameters tco, tDOH, tCCQO, tCQOH based on device characterization).
Updated Ordering Information (Removed × 18 option from ordering table).
Updated Package Diagram.
Changed DLL lockup cycles from 2048 to 10240 throughout document.
Updated in new template.
*C
3471321
12/21/2011
HRP
Updated Identification Register Definitions (Replaced the value of Cypress
device ID (28:12) from 11010011010010100 to 11010010100010100 for
CYRS1542AV18 and replaced the value of Cypress device ID (28:12) from
11010011010100100 to 11010010100100100 for CYRS1544AV18).
*D
3524961
02/14/2012
HRP
Updated Prototyping Options under Radiation Performance. (Added two
devices).
Updated Application Example.
Updated Truth Table.
Updated Maximum Ratings.
Updated Radiation Performance.
Updated Capacitance.
Updated Thermal Resistance.
Updated Switching Characteristics.
Updated Ordering Information (Removed 200 MHz speed part
CYRS1544AV18-200GCMB).
*E
3537277
02/29/2012
HRP
Updated Radiation Data under Radiation Performance.
Updated
Ordering
Information
(Removed
the
part
number
CYRS1544AV18-250GCMB
and
added
the
part
numbers
CYRS1543AV18-250GCMB,
CYRS1545AV18-250GCMB,
CYPT1543AV18-250GCMB,
CYPT1545AV18-250GCMB,
5962F1120201VXA and 5962F1120202VXA).
Description of Change
*F
3580538
04/12/2012
HRP
Updated Ordering Information (Updated part numbers).
*G
3617759
05/15/2012
HRP
Updated Radiation Performance (Updated Prototyping Options).
Updated Ordering Information (Added part 5962F1120101VXA).
Updated Glossary.
Document Number: 001-60006 Rev. *M
Page 31 of 34
CYRS1542AV18
CYRS1544AV18
Document History Page (continued)
Document Title: CYRS1542AV18/CYRS1544AV18, 72-Mbit QDR® II+ SRAM Two-Word Burst Architecture with RadStop™
Technology
Document Number: 001-60006
Rev.
ECN No.
Submission
Date
Orig. of
Change
*H
3640834
06/08/2012
HRP
Updated Radiation Performance (Updated Prototyping Options).
Renamed the section Class V Flow as Manufacturing Flow.
Updated Glossary.
*I
3857750
01/04/2013
HRP
Updated Ordering Information (Updated part numbers).
*J
3900846
02/11/2013
HRP
Updated Neutron Soft Error Immunity (Changed value of Test Conditions of
SEL parameter from 85 °C to 125 °C).
Description of Change
Updated Pin Definitions (Changed Pin Name from A to A[x:0]).
Updated Functional Overview (Updated Qualification and Screening
(Replaced Class V with Class Q)).
*K
3934155
03/15/2013
MISA
Updated Selection Guide:
Changed Maximum operating current (concurrent R/W) corresponding to
“× 18” for 250 MHz frequency from 1650 mA to 1700 mA.
Changed Maximum operating current (concurrent R/W) corresponding to
“× 36” for 250 MHz frequency from 1650 mA to 1700 mA.
Updated Electrical Characteristics:
Updated DC Electrical Characteristics:
Changed maximum value of IDD parameter corresponding
250 MHz frequency from 1650 mA to 1700 mA.
Changed maximum value of IDD parameter corresponding
250 MHz frequency from 1650 mA to 1700 mA.
Changed maximum value of ISB1 parameter corresponding
250 MHz frequency from 600 mA to 660 mA.
Changed maximum value of ISB1 parameter corresponding
250 MHz frequency from 550 mA to 660 mA.
Removed 200 MHz frequency related information.
to “× 18” for
to “× 36” for
to “× 18” for
to “× 36” for
Updated Switching Characteristics:
Changed maximum value of tCO and tCHQV parameters from 0.7 ns to 0.85 ns.
Changed minimum value of tDOH and tCHQX parameters from –0.7 ns to
–0.85 ns.
Changed maximum value of tCCQO and tCHCQV parameters from 0.7 ns to
0.85 ns.
Changed minimum value of tCQOH and tCHCQX parameters from –0.7 ns to
–0.85 ns.
Removed 200 MHz frequency related information.
Updated Package Diagram:
spec 001-58969 – Changed revision from *C to *D.
*L
4286754
02/21/2014
MISA
Updated Functional Overview:
Updated Qualification and Screening:
Replaced “Class Q” with “Class Q, Class V”.
Updated Ordering Information (Updated part numbers).
Updated to new template.
Document Number: 001-60006 Rev. *M
Page 32 of 34
CYRS1542AV18
CYRS1544AV18
Document History Page (continued)
Document Title: CYRS1542AV18/CYRS1544AV18, 72-Mbit QDR® II+ SRAM Two-Word Burst Architecture with RadStop™
Technology
Document Number: 001-60006
Rev.
ECN No.
Submission
Date
Orig. of
Change
*M
4618500
01/09/2015
PRIT
Document Number: 001-60006 Rev. *M
Description of Change
Updated Radiation Performance:
Updated Radiation Data:
Updated 2nd bulleted point.
Updated Prototyping Options:
Updated 1st bulleted point.
Updated Functional Description:
Updated description.
Added “For a complete list of related resources, click here.” at the end.
Updated Pin Definitions:
Updated description of CQ and CQ pins.
Updated Functional Overview:
Updated description.
Updated Read Operations:
Updated description.
Updated Write Operations:
Updated description.
Updated Application Example:
Updated Figure 2.
Page 33 of 34
CYRS1542AV18
CYRS1544AV18
Sales, Solutions, and Legal Information
Worldwide Sales and Design Support
Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. To find the office
closest to you, visit us at Cypress Locations.
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Community | Forums | Blogs | Video | Training
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© Cypress Semiconductor Corporation, 2010-2015. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of
any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for
medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as
critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in life-support systems
application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
Any Source Code (software and/or firmware) is owned by Cypress Semiconductor Corporation (Cypress) and is protected by and subject to worldwide patent protection (United States and foreign),
United States copyright laws and international treaty provisions. Cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create derivative works of,
and compile the Cypress Source Code and derivative works for the sole purpose of creating custom software and or firmware in support of licensee product to be used only in conjunction with a Cypress
integrated circuit as specified in the applicable agreement. Any reproduction, modification, translation, compilation, or representation of this Source Code except as specified above is prohibited without
the express written permission of Cypress.
Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein. Cypress does not
assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in life-support systems where
a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application implies that the manufacturer
assumes all risk of such use and in doing so indemnifies Cypress against all charges.
Use may be limited by and subject to the applicable Cypress software license agreement.
Document Number: 001-60006 Rev. *M
Revised January 9, 2015
Page 34 of 34
QDR RAMs and Quad Data Rate RAMs comprise a new family of products developed by Cypress, IDT, NEC, Renesas, and Samsung. All products and company names mentioned in this document
may be the trademarks of their respective holders.
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