Features
• Fast Read Access Time - 70 ns
• Dual Voltage Range Operation
•
•
•
•
•
•
•
•
– Unregulated Battery Power Supply Range, 2.7V to 3.6V
or Standard 5V ± 10% Supply Range
Pin Compatible with JEDEC Standard AT27C256R
Low Power CMOS Operation
– 20 µA max. (less than 1 µA typical) Standby for VCC = 3.6V
– 29 mW max. Active at 5 MHz for VCC = 3.6V
JEDEC Standard Surface Mount Packages
– 32-Lead PLCC
– 28-Lead 330-mil SOIC
– 28-Lead TSOP
High Reliability CMOS Technology
– 2,000V ESD Protection
– 200 mA Latchup Immunity
Rapid™ Programming Algorithm - 100 µs/byte (typical)
CMOS and TTL Compatible Inputs and Outputs
– JEDEC Standard for LVTTL and LVBO
Integrated Product Identification Code
Commercial and Industrial Temperature Ranges
256K (32K x 8)
Unregulated
Battery-Voltage™
High Speed
OTP EPROM
Description
The AT27BV256 is a high performance, low power, low voltage 262,144-bit one-time
programmable read only memory (OTP EPROM) organized as 32K by 8 bits. It
requires only one supply in the range of 2.7V to 3.6V in normal read mode operation,
making it ideal for fast, portable systems using either regulated or unregulated battery
(continued)
power.
SOIC Top View
Pin Configurations
Pin Name
Function
A0 - A14
Addresses
O0 - O7
Outputs
CE
Chip Enable
OE
Output Enable
NC
No Connect
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
4
3
2
1
32
31
30
A7
A12
VPP
NC
VCC
A14
A13
PLCC Top View
29
28
27
26
25
24
23
22
21
14
15
16
17
18
19
20
5
6
7
8
9
10
11
12
13
A8
A9
A11
NC
OE
A10
CE
O7
O6
O1
O2
GND
NC
O3
O4
O5
A6
A5
A4
A3
A2
A1
A0
NC
O0
Note: PLCC package pins 1 and 17 are
DON’T CONNECT.
AT27BV256
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
A14
A13
A8
A9
A11
OE
A10
CE
O7
O6
O5
O4
O3
TSOP Top View
Type 1
OE
A11
A9
A8
A13
A14
VCC
VPP
A12
A7
A6
A5
A4
A3
22
23
24
25
26
27
28
1
2
3
4
5
6
7
21
20
19
18
17
16
15
14
13
12
11
10
9
8
A10
CE
O7
O6
O5
O4
O3
GND
O2
O1
O0
A0
A1
A2
Rev. 0601B–10/98
1
Atmel’s innovative design techniques provide fast speeds
that rival 5V parts while keeping the low power consumption of a 3V supply. At V CC = 2.7V, any word can be
accessed in less than 70 ns. With a typical power dissipation of only 18 mW at 5 MHz and VCC = 3V, the AT27BV256
consumes less than one fifth the power of a standard 5V
EPROM.
Standby mode supply current is typically less than 1 µA at
3V. The AT27BV256 simplifies system design and
stretches battery lifetime even further by eliminating the
need for power supply regulation.
The AT27BV256 is available in industry standard JEDECapproved one-time programmable (OTP) plastic PLCC,
SOIC and TSOP packages. All devices feature two-line
control (CE, OE) to give designers the flexibility to prevent
bus contention.
The AT27BV256 operating with VCC at 3.0V produces TTL
level outputs that are compatible with standard TTL logic
devices operating at VCC = 5.0V. At VCC = 2.7V, the part is
compatible with JEDEC approved low voltage battery operation (LVBO) interface specifications. The device is also
capable of standard 5-volt operation making it ideally suited
for dual supply range systems or card products that are
pluggable in both 3-volt and 5-volt hosts.
Atmel’s AT27BV256 has additional features to ensure high
quality and efficient production use. The Rapid™ Program-
Block Diagram
2
AT27BV256
ming Algorithm reduces the time required to program the
part and guarantees reliable programming. Programming
time is typically only 100 µs/byte. The Integrated Product
Identification Code electronically identifies the device and
manufacturer. This feature is used by industry standard
programming equipment to select the proper programming
algorithms and voltages. The AT27BV256 programs
exactly the same way as a standard 5V AT27C256R and
uses the same programming equipment.
System Considerations
Switching between active and standby conditions via the
Chip Enable pin may produce transient voltage excursions.
Unless accommodated by the system design, these transients may exceed data sheet limits, resulting in device
non-conformance. At a minimum, a 0.1 µF high frequency,
low inherent inductance, ceramic capacitor should be utilized for each device. This capacitor should be connected
between the V CC and Ground terminals of the device, as
close to the device as possible. Additionally, to stabilize the
supply voltage level on printed circuit boards with large
EPROM arrays, a 4.7 µF bulk electrolytic capacitor should
be utilized, again connected between the VCC and Ground
terminals. This capacitor should be positioned as close as
possible to the point where the power supply is connected
to the array.
AT27BV256
Absolute Maximum Ratings*
Temperature Under Bias .................................. -40°C to +85°C
*NOTICE:
Storage Temperature ..................................... -65°C to +125°C
Voltage on Any Pin with
Respect to Ground ........................................ -2.0V to +7.0V (1)
Voltage on A9 with
Respect to Ground ......................................-2.0V to +14.0V(1)
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect
device reliability
VPP Supply Voltage with
Respect to Ground .......................................-2.0V to +14.0V(1)
Note:
1.
Minimum voltage is -0.6V dc which may undershoot to -2.0V for pulses of less than 20 ns. Maximum output pin voltage is
VCC + 0.75V dc which may be exceeded if certain precautions are observed (consult application notes) and which may
overshoot to +7.0V for pulses of less than 20 ns.
Operating Modes
Mode \ Pin
Read
CE
(2)
VIL
Output Disable
(2)
Standby(2)
Rapid Program
(3)
PGM Verify
Optional PGM Verify
PGM Inhibit(3)
(3)(5)
Product Identification
Notes:
Ai
(1)
VPP
VCC
VCC
VCC(2)
Outputs
DOUT
High Z
VIL
VIH
X
VCC
VIH
X
X
VCC
VCC(2)
High Z
VPP
VCC(3)
DIN
VPP
VCC(3)
DOUT
DOUT
X
(3)
VIL
Ai
VCC(2)
VIL
(3)
OE
VIH
VIL
Ai
Ai
VIL
VIL
Ai
VCC
VCC(3)
VIH
VIH
X
VPP
VCC(3)
High Z
VIL
A9 = VH(4)
A0 = VIH or VIL
A1 - A14 = VIL
VCC
VCC(3)
Identification Code
VIL
1. X can be VIL or VIH.
2. Read, output disable, and standby modes require, 2.7V ≤ VCC ≤ 3.6V, or 4.5V ≤ VCC ≤ 5.5V.
3. Refer to Programming Characteristics. Programming modes require VCC = 6.5V.
4. VH = 12.0 ± 0.5V.
5. Two identifier bytes may be selected. All Ai inputs are held low (VIL), except A9 which is set to VH and A0 which is toggled low
(VIL) to select the Manufacturers’ Identification byte and high (VIH) to select the Device Code byte.
3
DC and AC Operating Conditions for Read Operation
AT27BV256
-70
-90
-12
-15
0°C - 70°C
0°C - 70°C
0°C - 70°C
0°C - 70°C
-40°C - 85°C
-40°C - 85°C
-40°C - 85°C
-40°C - 85°C
2.7V to 3.6V
2.7V to 3.6V
2.7V to 3.6V
2.7V to 3.6V
5V ± 10%
5V ± 10%
5V ± 10%
5V ± 10%
Com.
Operating Temperature
(Case)
Ind.
VCC Power Supply
DC and Operating Characteristics for Read Operation
Symbol
Parameter
Condition
Min
Max
Units
VCC = 2.7V to 3.6V
ILI
ILO
IPP1
(2)
Input Load Current
VIN = 0V to VCC
±1
µA
Output Leakage Current
VOUT = 0V to VCC
±5
µA
VPP = VCC
10
µA
ISB1 (CMOS), CE = VCC ± 0.3V
20
µA
ISB2 (TTL), CE = 2.0 to VCC + 0.5V
100
µA
8
mA
VPP
(1)
Read/Standby Current
ISB
VCC(1) Standby Current
ICC
VCC Active Current
VIL
Input Low Voltage
VIH
Input High Voltage
VOL
Output Low Voltage
VOH
Output High Voltage
f = 5 MHz, IOUT = 0 mA, CE = VIL, VCC = 3.6V
VCC = 3.0 to 3.6V
-0.6
0.8
V
VCC = 2.7 to 3.6V
-0.6
0.2 x VCC
V
VCC = 3.0 to 3.6V
2.0
VCC + 0.5
V
VCC = 2.7 to 3.6V
0.7 x VCC
VCC + 0.5
V
IOL = 2.0 mA
0.4
V
IOL = 100 µA
0.2
V
IOL = 20 µA
0.1
V
IOH = -2.0 mA
2.4
V
IOH = -100 µA
VCC - 0.2
V
IOH = -20 µA
VCC - 0.1
V
VCC = 4.5V to 5.5V
ILI
ILO
IPP1
(2)
Input Load Current
VIN = 0V to VCC
±1
µA
Output Leakage Current
VOUT = 0V to VCC
±5
µA
VPP = VCC
10
µA
ISB1 (CMOS), CE = VCC ± 0.3V
100
µA
ISB2 (TTL), CE = 2.0 to VCC + 0.5V
1
mA
f = 5 MHz, IOUT = 0 mA, CE = VIL
20
mA
VPP
(1)
Read/Standby Current
ISB
VCC(1) Standby Current
ICC
VCC Active Current
VIL
Input Low Voltage
-0.6
0.8
V
VIH
Input High Voltage
2.0
VCC + 0.5
V
VOL
Output Low Voltage
IOL = 2.1 mA
0.4
V
VOH
Output High Voltage
IOH = -400 µA
Notes:
2.4
V
1. VCC must be applied simultaneously with or before VPP, and removed simultaneously with or after VPP.
2. VPP may be connected directly to VCC, except during programming. The supply current would then be the sum of ICC and IPP.
4
AT27BV256
AT27BV256
AC Characteristics for Read Operation
VCC = 2.7V to 3.6V and 4.5V to 5.5V
AT27BV256
-70
Symbol
-90
-12
Parameter
Condition
Address to Output Delay
CE = OE = VIL
70
90
tCE(2)
CE to Output Delay
OE = VIL
70
tOE(2)(3)
OE to Output Delay
CE = VIL
tDF(4)(5)
OE or CE High to Output Float,
whichever occurred first
tOH
Output Hold from Address, CE
or OE, whichever occurred first
tACC
(3)
Min
-15
Max
Units
120
150
ns
90
120
150
ns
50
50
50
60
ns
40
40
40
50
ns
Max
0
Min
Max
0
Min
0
Max
Min
0
ns
AC Waveforms for Read Operation(1)
Notes:
1. Timing measurement references are 0.8V and 2.0V. Input AC drive levels are 0.45V and 2.4V, unless otherwise specified.
2. OE may be delayed up to tCE-tOE after the falling edge of CE without impact on tCE.
3. OE may be delayed up to tACC-tOE after the address is valid without impact on tACC.
4. This parameter is only sampled and is not 100% tested.
5. Output float is defined as the point when data is no longer driven.
6. When reading a 27BV256, a 0.1 µF capacitor is required across VCC and ground to suppress spurious voltage transients.
5
Input Test Waveform and
Measurement Level
Output Test Load
tR, tF < 20 ns (10% to 90%)
Note: CL = 100 pF
including jig capacitance.
Pin Capacitance
f = 1 MHz, T = 25°C(1)
Symbol
Typ
Max
Units
Conditions
CIN
4
8
pF
VIN = 0V
COUT
8
12
pF
VOUT = 0V
Note:
6
1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
AT27BV256
AT27BV256
Programming Waveforms(1)
Notes:
1.
The Input Timing Reference is 0.8V for VIL and 2.0V for VIH.
2.
tOE and tDFP are characteristics of the device but must be accommodated by the programmer.
3.
When programming the AT27BV256 a 0.1 µF capacitor is required across VPP and ground to suppress spurious voltage
transients.
DC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V
Limits
Symbol
Parameter
Test Conditions
ILI
Input Load Current
VIN = VIL, VIH
VIL
Input Low Level
VIH
Input High Level
VOL
Output Low Voltage
IOL = 2.1 mA
VOH
Output High Voltage
IOH = -400 µA
ICC2
VCC Supply Current (Program and Verify)
IPP2
VPP Current
VID
A9 Product Identification Voltage
Min
Max
Units
±10
µA
-0.6
0.8
V
2.0
VCC + 0.5
V
0.4
V
2.4
CE = VIL
11.5
V
25
mA
25
mA
12.5
V
7
AC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V
Limits
Symbol
Parameter
Test Conditions
tAS
Address Setup Time
tOES
OE Setup Time
tDS
Data Setup Time
tAH
Address Hold Time
Min
Input Rise and Fall Times:
(10% to 90%) 20 ns
Input Pulse Levels:
tDH
Data Hold Time
tDFP
OE High to Output Float Delay (2)
tVPS
VPP Setup Time
tVCS
VCC Setup Time
0.45V to 2.4V
Input Timing Reference Level:
0.8V to 2.0V
(3)
tPW
CE Program Pulse Width
tOE
Data Valid from OE(2)
tPRT
VPP Pulse Rise Time During
Programming
Notes:
(1)
Output Timing Reference Level:
0.8V to 2.0V
Max
Units
2
µs
2
µs
2
µs
0
µs
2
µs
0
130
ns
2
µs
2
µs
95
105
µs
150
ns
50
ns
1. VCC must be applied simultaneously or before VPP
and removed simultaneously or after VPP.
2. This parameter is only sampled and is not 100% tested. Output Float is defined as the point where data is no longer driven—
see timing diagram.
3. Program Pulse width tolerance is 100 µsec ± 5%.
Atmel’s 27BV256 Integrated Product Identification Code(1)
Pins
A0
O7
O6
O5
O4
O3
O2
O1
O0
Hex
Data
Manufacturer
0
0
0
0
1
1
1
1
0
1E
Device Type
1
1
0
0
0
1
1
0
0
8C
Codes
Note:
8
1. The AT27BV256 has the same Product Identification Code as the AT27C256R and AT27LV256A. They are all programming
compatible.
AT27BV256
AT27BV256
Rapid Programming Algorithm
A 100 µs CE pulse width is used to program. The address
is set to the first location. VCC is raised to 6.5V and VPP is
raised to 13.0V. Each address is first programmed with one
100 µs CE pulse without verification. Then a verification/
reprogramming loop is executed for each address. In the
event a byte fails to pass verification, up to 10 successive
100 µs pulses are applied with a verification after each
pulse. If the byte fails to verify after 10 pulses have been
applied, the part is considered failed. After the byte verifies
properly, the next address is selected until all have been
checked. VPP is then lowered to 5.0V and VCC to 5.0V. All
bytes are read again and compared with the original data to
determine if the device passes or fails.
9
Ordering Information
ICC (mA)
tACC
(ns)
Active
Standby
Ordering Code
Package
70
8
0.02
AT27BV256-70JC
AT27BV256-70RC
AT27BV256-70TC
32J
28R
28T
Commercial
(0°C to 70°C)
8
0.02
AT27BV256-70JI
AT27BV256-70RI
AT27BV256-70TI
32J
28R
28T
Industrial
(-40°C to 85°C)
8
0.02
AT27BV256-90JC
AT27BV256-90RC
AT27BV256-90TC
32J
28R
28T
Commercial
(0°C to 70°C)
8
0.02
AT27BV256-90JI
AT27BV256-90RI
AT27BV256-90TI
32J
28R
28T
Industrial
(-40°C to 85°C)
8
0.02
AT27BV256-12JC
AT27BV256-12RC
AT27BV256-12TC
32J
28R
28T
Commercial
(0°C to 70°C)
8
0.02
AT27BV256-12JI
AT27BV256-12RI
AT27BV256-12TI
32J
28R
28T
Industrial
(-40°C to 85°C)
8
0.02
AT27BV256-15JC
AT27BV256-15RC
AT27BV256-15TC
32J
28R
28T
Commercial
(0°C to 70°C)
8
0.02
AT27BV256-15JI
AT27BV256-15RI
AT27BV256-15TI
32J
28R
28T
Industrial
(-40°C to 85°C)
90
120
150
Package Type
32J
32-Lead, Plastic J-Leaded Chip Carrier (PLCC)
28R
28-Lead, 0.330" Wide, Plastic Gull Wing Small Package (SOIC)
28T
28-Lead, Plastic Thin Small Outline Package
10
AT27BV256
Operation Range
AT27BV256
Packaging Information
32J, 32-Lead, Plastic J-Leaded Chip Carrier (PLCC)
Dimensions in Inches and (Millimeters)
JEDEC STANDARD MS-016 AE
.045(1.14) X 45˚
.025(.635) X 30˚ - 45˚
.012(.305)
.008(.203)
PIN NO. 1
IDENTIFY
.553(14.0)
.547(13.9)
.595(15.1)
.585(14.9)
.032(.813)
.026(.660)
.050(1.27) TYP
28R, 28-Lead, 0.330" Wide, Plastic Gull Wing Small
Outline (SOIC)
Dimensions in Inches and (Millimeters)
.300(7.62) REF
.430(10.9)
.390(9.90)
AT CONTACT
POINTS
.530(13.5)
.490(12.4)
.021(.533)
.013(.330)
.030(.762)
.015(.381)
.095(2.41)
.060(1.52)
.140(3.56)
.120(3.05)
.022(.559) X 45˚ MAX (3X)
.453(11.5)
.447(11.4)
.495(12.6)
.485(12.3)
28T, 28-Lead, Plastic Thin Small Outline Package
(TSOP)
Dimensions in Millimeters and (Inches)*
INDEX
MARK
AREA
11.9 (0.469)
11.7 (0.461)
13.7 (0.539)
13.1 (0.516)
0.27 (0.011)
0.18 (0.007)
0.55 (0.022)
BSC
7.15 (0.281)
REF
8.10 (0.319)
7.90 (0.311)
1.25 (0.049)
1.05 (0.041)
0.20 (0.008)
0.10 (0.004)
0
5 REF
0.20 (0.008)
0.15 (0.006)
0.70 (0.028)
0.30 (0.012)
*Controlling dimension: millimeters
11
Atmel Headquarters
Atmel Operations
Corporate Headquarters
Atmel Colorado Springs
2325 Orchard Parkway
San Jose, CA 95131
TEL (408) 441-0311
FAX (408) 487-2600
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TEL (719) 576-3300
FAX (719) 540-1759
Atmel Rousset
Atmel U.K., Ltd.
Coliseum Business Centre
Riverside Way
Camberley, Surrey GU15 3YL
England
TEL (44) 1276-686677
FAX (44) 1276-686697
Zone Industrielle
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TEL (33) 4 42 53 60 00
FAX (33) 4 42 53 60 01
Asia
Atmel Asia, Ltd.
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77 Mody Road
Tsimshatsui East
Kowloon, Hong Kong
TEL (852) 27219778
FAX (852) 27221369
Japan
Atmel Japan K.K.
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1-24-8 Shinkawa
Chuo-ku, Tokyo 104-0033
Japan
TEL (81) 3-3523-3551
FAX (81) 3-3523-7581
Fax-on-Demand
North America:
1-(800) 292-8635
International:
1-(408) 441-0732
e-mail
literature@atmel.com
Web Site
http://www.atmel.com
BBS
1-(408) 436-4309
© Atmel Corporation 1998.
Atmel Cor poration makes no warranty for the use of its products, other than those expressly contained in the Company’s standard warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s website. The Company assumes no responsibility for
any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without
notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual proper ty of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel’s products are
not authorized for use as critical components in life suppor t devices or systems.
Marks bearing
®
and/or
™
are registered trademarks and trademarks of Atmel Corporation.
Terms and product names in this document may be trademarks of others.
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