Features
•
•
•
•
•
•
•
•
•
•
•
•
Single Supply Voltage, Range 3V to 3.6V
3-Volt Only Read and Write Operation
Software Protected Programming
Low Power Dissipation
– 15 mA Active Current
– 40 µA CMOS Standby Current
Fast Read Access Time - 150 ns
Sector Program Operation
– Single Cycle Reprogram (Erase and Program)
– 512 Sectors (64 bytes/sector)
– Internal Address and Data Latches for 64 Bytes
Fast Sector Program Cycle Time - 20 ms Max.
Internal Program Control and Timer
DATA Polling for End of Program Detection
Typical Endurance > 10,000 Cycles
CMOS and TTL Compatible Inputs and Outputs
Commercial and Industrial Temperature Ranges
256K (32K x 8)
3-volt Only
Flash Memory
AT29LV256
Description
The AT29LV256 is a 3-volt-only in-system Flash Programmable Erasable Read Only
Memory (PEROM). Its 256K of memory is organized as 32,768 words by 8 bits. Manufactured with Atmel’s advanced nonvolatile CMOS technology, the device offers
access times to 150 ns with power dissipation of just 54 mW over the commercial temperature range. When the device is deselected, the CMOS standby current is less
than 40 µA. The device endurance is such that any sector can typically be written to in
excess of 10,000 times.
(continued)
Pin Configurations
TSOP Top View
Type 1
Pin Name
Function
A0 - A14
Addresses
CE
Chip Enable
OE
Output Enable
WE
Write Enable
I/O0 - I/O7
Data Inputs/Outputs
NC
No Connect
DC
Don’t Connect
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
I/O7
I/O6
I/O5
I/O4
I/O3
GND
I/O2
I/O1
I/O0
A0
A1
A2
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
I/O1
I/O2
GND
DC
I/O3
I/O4
I/O5
A6
A5
A4
A3
A2
A1
A0
NC
I/O0
4
3
2
1
32
31
30
A7
A12
WE
DC
VCC
A14
A13
PLCC Top View
OE
A11
A9
A8
A13
A14
VCC
WE
A12
A7
A6
A5
A4
A3
A8
A9
A11
NC
OE
A10
CE
I/O7
I/O6
Rev. 0563B–10/98
1
To allow for simple in-system reprogrammability, the
AT29LV256 does not require high input voltages for programming. Three-volt-only commands determine the operation of the device. Reading data out of the device is similar
to reading from an EPROM. Reprogramming the
AT29LV256 is performed on a sector basis; 64 bytes of
data are loaded into the device and then simultaneously
programmed.
During a reprogram cycle, the address locations and 64
bytes of data are captured at microprocessor speed and
internally latched, freeing the address and data bus for
other operations. Following the initiation of a program
cycle, the device will automatically erase the sector and
then program the latched data using an internal control
timer. The end of a program cycle can be detected by
DATA polling of I/O7. Once the end of a program cycle has
been detected, a new access for a read or program can
begin.
Block Diagram
Device Operation
READ: The AT29LV256 is accessed like an EPROM.
When CE and OE are low and WE is high, the data stored
at the memory location determined by the address pins is
asserted on the outputs. The outputs are put in the high
impedance state whenever CE or OE is high. This dual-line
control gives designers flexibility in preventing bus contention.
SOFTWARE DATA PROTECTION PROGRAMMING: The
AT29LV256 has 512 individual sectors, each 64 bytes.
Using the software data protection feature, byte loads are
used to enter the 64 bytes of a sector to be programmed.
The AT29LV256 can only be programmed or reprogrammed using the software data protection feature. The
device is programmed on a sector basis. If a byte of data
within the sector is to be changed, data for the entire 64byte sector must be loaded into the device. The
AT29LV256 automatically does a sector erase prior to
loading the data into the sector. An erase command is not
required.
Software data protection protects the device from inadvertent programming. A series of three program commands to
specific addresses with specific data must be presented to
the device before programming may occur. The same three
program commands must begin each program operation.
All software program commands must obey the sector program timing specifications. Power transitions will not reset
2
AT29LV256
the software data protection feature, however the software
feature will guard against inadvertent program cycles during power transitions.
Any attempt to write to the device without the 3-byte command sequence will start the internal write timers. No data
will be written to the device; however, for the duration of
tWC, a read operation will effectively be a polling operation.
After the software data protection’s 3-byte command code
is given, a byte load is performed by applying a low pulse
on the WE or CE input with CE or WE low (respectively)
and OE high. The address is latched on the falling edge of
CE or WE, whichever occurs last. The data is latched by
the first rising edge of CE or WE.
The 64 bytes of data must be loaded into each sector. Any
byte that is not loaded during the programming of its sector
will be erased to read FFh. Once the bytes of a sector are
loaded into the device, they are simultaneously programmed during the internal programming period. After the
first data byte has been loaded into the device, successive
bytes are entered in the same manner. Each new byte to
be programmed must have its high to low transition on WE
(or CE) within 150 µs of the low to high transition of WE (or
CE) of the preceding byte. If a high to low transition is not
detected within 150 µs of the last low to high transition, the
load period will end and the internal programming period
AT29LV256
will start. A6 to A14 specify the sector address. The sector
address must be valid during each high to low transition of
WE (or CE). A0 to A5 specify the byte address within the
sector. The bytes may be loaded in any order; sequential
loading is not required. Once a programming operation has
been initiated, and for the duration of tWC, a read operation
will effectively be a polling operation.
HARDWARE DATA PROTECTION: Hardware features
protect against inadvertent programs to the AT29LV256 in
the following ways: (a) V CC sense—if V CC is below 1.8V
(typical), the program function is inhibited; (b) VCC power on
delay—once V CC has reached the V CC sense level, the
device will automatically time out 10 ms (typical) before
programming; (c) Program inhibit— olding any one of OE
low, CE high or WE high inhibits program cycles; and
(d) Noise filter—pulses of less than 15 ns (typical) on the
WE or CE inputs will not initiate a program cycle.
INPUT LEVELS: While operating with a 3.3V ±10% power
supply, the address inputs and control inputs (OE, CE and
WE) may be driven from 0 to 5.5V without adversely affecting the operation of the device. The I/O lines can only be
driven from 0 to 3.6 volts.
PRODUCT IDENTIFICATION: The product identification
mode identifies the device and manufacturer as Atmel. It
may be accessed by hardware or software operation. The
hardware operation mode can be used by an external programmer to identify the correct programming algorithm for
the Atmel product. In addition, users may wish to use the
software product identification mode to identify the part (i.e.
using the device code), and have the system software use
the appropriate sector size for program operations. In this
manner, the user can have a common board design for
256K to 4-megabit densities and, with each density’s sector
size in a memory map, have the system software apply the
appropriate sector size.
For details, see Operating Modes (for hardware operation)
or Software Product Identification. The manufacturer and
device code is the same for both modes.
DATA POLLING: The AT29LV256 features DATA polling
to indicate the end of a program cycle. During a program
cycle an attempted read of the last byte loaded will result in
the complement of the loaded data on I/O7. Once the program cycle has been completed, true data is valid on all
outputs and the next cycle may begin. DATA polling may
begin at any time during the program cycle.
TOGGLE BIT: In addition to DATA polling the
AT29LV256 provides another method for determining the
end of a program or erase cycle. During a program or erase
operation, successive attempts to read data from the
device will result in I/O6 toggling between one and zero.
Once the program cycle has completed, I/O6 will stop toggling and valid data will be read. Examining the toggle bit
may begin at any time during a program cycle.
OPTIONAL CHIP ERASE MODE: The entire device can
be erased by using a 6-byte software code. Please see
Software Chip Erase application note for details.
Absolute Maximum Ratings*
Temperature Under Bias ................................ -55°C to +125°C
Storage Temperature ..................................... -65°C to +150°C
All Input Voltages (including NC Pins)
with Respect to Ground ...................................-0.6V to +6.25V
All Output Voltages
with Respect to Ground .............................-0.6V to VCC + 0.6V
*NOTICE:
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.
Voltage on A9 (including NC Pins)
with Respect to Ground ...................................-0.6V to +13.5V
3
DC and AC Operating Range
Com.
Operating
Temperature (Case)
Ind.
VCC Power Supply
AT29LV256-15
AT29LV256-20
AT29LV256-25
0°C - 70°C
0°C - 70°C
0°C - 70°C
-40°C - 85°C
-40°C - 85°C
-40°C - 85°C
3.3V ± 0.3V
3.3V ± 0.3V
3.3V ± 0.3V
Operating Modes
Mode
Read
(2)
Program
Standby/Write Inhibit
CE
OE
WE
Ai
I/O
VIL
VIL
VIH
Ai
DOUT
VIL
VIH
VIL
Ai
DIN
X
High Z
(1)
VIH
X
X
Program Inhibit
X
X
VIH
Program Inhibit
X
VIL
X
Output Disable
X
VIH
X
VIL
VIL
VIH
High Z
Product Identification
Hardware
A1 - A14 = VIL, A9 = VH(3), A0 = VIL
Manufacturer Code(4)
A1 - A14 = VIL, A9 = VH(3), A0 = VIH
Device Code(4)
Software(5)
Notes:
A0 = VIL
Manufacturer Code(4)
A0 = VIH
Device Code(4)
1. X can be VIL or VIH.
2. Refer to AC Programming Waveforms.
3. VH = 12.0V ± 0.5V.
4. Manufacturer Code is 1F. The Device Code is BC.
5. See details under Software Product Identification Entry/Exit.
DC Characteristics
Symbol
Parameter
Condition
ILI
Input Load Current
ILO
Max
Units
VIN = 0V to VCC
1
µA
Output Leakage Current
VI/O = 0V to VCC
1
µA
Com.
40
ISB1
VCC Standby Current CMOS
CE = VCC - 0.3V to VCC
µA
Ind.
50
µA
ISB2
VCC Standby Current TTL
CE = 2.0V to VCC
1
mA
ICC
VCC Active Current
f = 5 MHz; IOUT = 0 mA; VCC = 3.6V
15
mA
VIL
Input Low Voltage
0.6
V
VIH
Input High Voltage
VOL
Output Low Voltage
IOL = 1.6 mA; VCC = 3.0V
VOH
Output High Voltage
IOH = -100 µA; VCC = 3.0V
4
Min
2.0
AT29LV256
V
0.45
2.4
V
V
AT29LV256
AC Read Characteristics
Symbol
Parameter
tACC
AT29LV256-15
AT29LV256-20
AT29LV256-25
Min
Min
Min
Max
Max
Max
Units
Address to Output Delay
150
200
250
ns
(1)
CE to Output Delay
150
200
250
ns
(2)
OE to Output Delay
0
70
0
100
0
120
ns
tDF(3)(4)
CE or OE to Output Float
0
40
0
50
0
60
ns
tOH
Output Hold from OE, CE or Address,
whichever occurred first
0
tCE
tOE
0
0
ns
AC Read Waveforms(1)(2)(3)(4)
Notes:
1. CE may be delayed up to tACC - tCE after the address transition without impact on tACC.
2. OE may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE or by tACC - tOE after an address change
without impact on tACC.
3. tDF is specified from OE or CE whichever occurs first (CL = 5 pF).
4. This parameter is characterized and is not 100% tested.
Input Test Waveforms and
Measurement Level
Output Test Load
tR, tF < 5 ns
Pin Capacitance
f = 1 MHz, T = 25°C(1)
Symbol
Typ
Max
Units
Conditions
CIN
4
6
pF
VIN = 0V
COUT
8
12
pF
VOUT = 0V
Note:
1. These parameters are characterized and not 100% tested.
5
AC Byte Load Characteristics
Symbol
Parameter
Min
tAS, tOES
Address, OE Set-up Time
10
ns
tAH
Address Hold Time
100
ns
tCS
Chip Select Set-up Time
0
ns
tCH
Chip Select Hold Time
0
ns
tWP
Write Pulse Width (WE or CE)
200
ns
tDS
Data Set-up Time
100
ns
tDH, tOEH
Data, OE Hold Time
10
ns
tWPH
Write Pulse Width High
200
ns
AC Byte Load Waveforms(1)(2)
WE Controlled
CE Controlled
6
AT29LV256
Max
Units
AT29LV256
Program Cycle Characteristics
Symbol
Parameter
Min
Max
Units
tWC
Write Cycle Time
20
ms
tAS
Address Set-up Time
10
ns
tAH
Address Hold Time
100
ns
tDS
Data Set-up Time
100
ns
tDH
Data Hold Time
10
ns
tWP
Write Pulse Width
200
ns
tBLC
Byte Load Cycle Time
tWPH
Write Pulse Width High
150
200
µs
ns
Software Protected Program Waveform(1)(2)(3)
Notes:
1. OE must be high when WE and CE are both low.
2. A6 through A14 must specify the sector address during each high to low transition of WE (or CE) after the software code has
been entered.
3. All bytes that are not loaded within the sector being programmed will be indeterminate.
Programming Algorithm(1)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
ADDRESS 5555
WRITES ENABLED
LOAD DATA
TO
SECTOR (64 BYTES)(3)
ENTER DATA
PROTECT STATE(2)
Notes for software program code:
1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. Data Protect state will be re-activated at end of program cycle.
3. 64 bytes of data MUST BE loaded.
7
Data Polling Characteristics(1)
Symbol
Parameter
tDH
Data Hold Time
tOEH
OE Hold Time
Min
Max
OE to Output Delay
tWR
Write Recovery Time
Units
10
ns
10
ns
(2)
tOE
Notes:
Typ
ns
0
ns
1. These parameters are characterized and not 100% tested.
2. See tOE spec in AC Read Characteristics.
Data Polling Waveforms
Toggle Bit Characteristics(1)
Symbol
Parameter
tDH
Data Hold Time
10
ns
tOEH
OE Hold Time
10
ns
tOE
OE to Output Delay(2)
tOEHP
OE High Pulse
tWR
Write Recovery Time
Notes:
1. These parameters are characterized and not 100% tested.
2. See tOE spec in AC Read Characteristics.
Toggle Bit Waveforms(1)(3)
Notes:
8
1.
Toggling either OE or CE or both OE and CE will operate toggle bit.
2.
Beginning and ending state of I/O6 will vary.
3.
Any address location may be used but the address should not vary.
AT29LV256
Min
Typ
Max
Units
ns
150
ns
0
ns
AT29LV256
Software Product Identification Entry(1)
Software Product Identification Exit(1)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 90
TO
ADDRESS 5555
LOAD DATA F0
TO
ADDRESS 5555
PAUSE 20 mS
ENTER PRODUCT
IDENTIFICATION
MODE(2)(3)
PAUSE 20 mS
EXIT PRODUCT
IDENTIFICATION
MODE(4)
Notes for software product identification:
1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. A1 - A14 = VIL.
Manufacturer Code is read for A0 = VIL;
Device Code is read for A0 = VIH.
3. The device does not remain in identification mode if
powered down.
4. The device returns to standard operation mode.
5. Manufacturer Code is 1F. The Device Code is BC.
9
Ordering Information
ICC (mA)
tACC
(ns)
Active
Standby
Ordering Code
Package
150
15
0.04
AT29LV256-15JC
AT29LV256-15TC
32J
28T
Commercial
(0° to 70°C)
15
0.05
AT29LV256-15JI
AT29LV256-15TI
32J
28T
Industrial
(-40° to 85°C)
15
0.04
AT29LV256-20JC
AT29LV256-20PC
AT29LV256-20TC
32J
28P6
28T
Commercial
(0° to 70°C)
15
0.05
AT29LV256-20JI
AT29LV256-20PI
32J
28P6
Industrial
(-40° to 85°C)
15
0.04
AT29LV256-25JC
AT29LV256-25PC
AT29LV256-25TC
32J
28P6
28T
Commercial
(0° to 70°C)
15
0.05
AT29LV256-25JI
AT29LV256-25PI
32J
28P6
Industrial
(-40° to 85°C)
200
250
Package Type
32J
32-Lead, Plastic J-Leaded Chip Carrier (PLCC)
28P6
28-Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP)
28T
28-Lead, Thin Small Outline Package (TSOP)
10
AT29LV256
Operation Range
AT29LV256
Packaging Information
32J, 32-Lead, Plastic J-Leaded Chip Carrier (PLCC)
Dimensions in Inches and (Millimeters)
JEDEC STANDARD MS-016 AE
28P6, 28-Lead, 0.600" Wide, Plastic Dual Inline
Package (PDIP)
Dimensions in Inches and (Millimeters)
JEDEC STANDARD MS-011 AB
.045(1.14) X 45˚
PIN NO. 1
IDENTIFY
.553(14.0)
.547(13.9)
.595(15.1)
.585(14.9)
.032(.813)
.026(.660)
.050(1.27) TYP
1.47(37.3)
1.44(36.6)
.025(.635) X 30˚ - 45˚
.012(.305)
.008(.203)
.300(7.62) REF
.430(10.9)
.390(9.90)
AT CONTACT
POINTS
PIN
1
.566(14.4)
.530(13.5)
.530(13.5)
.490(12.4)
.021(.533)
.013(.330)
.090(2.29)
MAX
1.300(33.02) REF
.030(.762)
.015(.381)
.095(2.41)
.060(1.52)
.140(3.56)
.120(3.05)
.220(5.59)
MAX
SEATING
PLANE
.065(1.65)
.015(.381)
.022(.559)
.014(.356)
.161(4.09)
.125(3.18)
.110(2.79)
.090(2.29)
.022(.559) X 45˚ MAX (3X)
.453(11.5)
.447(11.4)
.495(12.6)
.485(12.3)
.005(.127)
MIN
.012(.305)
.008(.203)
.065(1.65)
.041(1.04)
.630(16.0)
.590(15.0)
0 REF
15
.690(17.5)
.610(15.5)
28T, 28-Lead, Plastic Thin Small Outline Package
(TSOP)
Dimensions in Inches and (Millimeters)*
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
Europe
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TEL (719) 576-3300
FAX (719) 540-1759
Atmel Rousset
Atmel U.K., Ltd.
Coliseum Business Centre
Riverside Way
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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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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.
Printed on recycled paper.
0563B–10/98//xM
