Rainbow-electronics AT29LV256 User Manual Page 1

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1
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
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. Man-
ufactured 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 tem-
perature 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.
256K (32K x 8)
3-volt Only
Flash Memory
AT29LV256
Rev. 0563B–10/98
Pin Configurations
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
PLCC Top View
5
6
7
8
9
10
11
12
13
29
28
27
26
25
24
23
22
21
A6
A5
A4
A3
A2
A1
A0
NC
I/O0
A8
A9
A11
NC
OE
A10
CE
I/O7
I/O6
4
3
2
1
32
31
30
14
15
16
17
18
19
20
I/O1
I/O2
GND
DC
I/O3
I/O4
I/O5
A7
A12
WE
DC
VCC
A14
A13
(continued)
TSOP Top View
Type 1
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
OE
A11
A9
A8
A13
A14
VCC
WE
A12
A7
A6
A5
A4
A3
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
GND
I/O2
I/O1
I/O0
A0
A1
A2
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Summary of Contents

Page 1 - AT29LV256

1Features•Single Supply Voltage, Range 3V to 3.6V•3-Volt Only Read and Write Operation•Software Protected Programming•Low Power Dissipation– 15 mA Act

Page 2

AT29LV25610Ordering InformationtACC(ns)ICC (mA)Ordering Code Package Operation RangeActive Standby150 15 0.04 AT29LV256-15JCAT29LV256-15TC32J28TCommer

Page 3

AT29LV25611Packaging Information.045(1.14) X 45˚PIN NO. 1IDENTIFY.025(.635) X 30˚ - 45˚.012(.305).008(.203).021(.533).013(.330).530(13.5).490(12.4).03

Page 4

© Atmel Corporation 1998.Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standa

Page 5

AT29LV2562To allow for simple in-system reprogrammability, theAT29LV256 does not require high input voltages for pro-gramming. Three-volt-only command

Page 6

AT29LV2563will start. A6 to A14 specify the sector address. The sectoraddress must be valid during each high to low transition ofWE (or CE). A0 to A5

Page 7

AT29LV2564Notes: 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.

Page 8

AT29LV2565AC 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

Page 9

AT29LV2566AC Byte Load Waveforms(1)(2)WE ControlledCE ControlledAC Byte Load CharacteristicsSymbol Parameter Min Max UnitstAS, tOESAddress, OE Set-up

Page 10

AT29LV2567Software 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

Page 11

AT29LV2568Notes: 1. These parameters are characterized and not 100% tested.2. See tOE spec in AC Read Characteristics.Data Polling WaveformsNotes: 1.

Page 12 - 0563B–10/98//xM

AT29LV2569Software Product Identification Entry(1)Notes for software product identification:1. Data Format: I/O7 - I/O0 (Hex);Address Format: A14 - A0

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