Manual

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Features

• Fast Read Access Time – 70 ns

• 5-volt Only Reprogramming

• Page Program Operation

– Single Cycle Reprogram (Erase and Program)

– Internal Address and Data Latches for 64 Bytes

• Internal Program Control and Timer

• Hardware and Software Data Protection

• Fast Program Cycle Times

– Page(64Byte)ProgramTime–10ms

– Chip Erase Time– 10 ms

• DATA Polling for End of Program Detection

• Low-power Dissipation

– 50mAActiveCurrent

–300 µA CMOS Standby Current

• Typical Endurance > 10,000 Cycles

• Single 5V ± 10% Supply

• CMOS and TTL Compatible Inputs and Outputs

• Commercial and Industrial Temperature Ranges

Description

The AT29C256 is a five-volt-only in-system Flash programmable and 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 70 ns with power dissipation of just 275 mW. When the device is

deselected, the CMOS standby current is less than 300 µA. The device endurance is

such that any sector can typically be written to in excess of 10,000 times.

256K (32K x 8)

5-volt Only

Flash Memory

AT29C256

Rev. 0046O–FLASH–06/02

PLCC and LCC Top View

Note: PLCC package pins 1 and 17 are

DON’T CONNECT.

Pin Configurations

Pin Name Function

A0 - A14 Addresses

Chip Enable

Output Enable

Write Enable

I/O0 - I/O7 Data Inputs/Outputs

NC No Connect

DC Don’t Connect

I/O0

A11

A10

I/O7

I/O6

I/O1

I/O2

GND

I/O3

I/O4

I/O5

A12

VCC

A14

A13

DIP Top View

TSOP Top View

Type 1

A12

I/O0

I/O1

I/O2

GND

VCC

A14

A13

A11

A10

I/O7

I/O6

I/O5

I/O4

I/O3

A11

A13

A14

VCC

A12

A10

I/O7

I/O6

I/O5

I/O4

I/O3

GND

I/O2

I/O1

I/O0

Summary of content (18 pages)

PAGE 1
Features • Fast Read Access Time – 70 ns • 5-volt Only Reprogramming • Page Program Operation • • • • • • • • • – Single Cycle Reprogram (Erase and Program) – Internal Address and Data Latches for 64 Bytes Internal Program Control and Timer Hardware and Software Data Protection Fast Program Cycle Times – Page (64 Byte) Program Time – 10 ms – Chip Erase Time– 10 ms DATA Polling for End of Program Detection Low-power Dissipation – 50 mA Active Current – 300 µA CMOS Standby Current Typical Endurance > 10,000
PAGE 2
To allow for simple in-system reprogrammability, the AT29C256 does not require high input voltages for programming. Five-volt-only commands determine the operation of the device. Reading data out of the device is similar to reading from a static RAM. Reprogramming the AT29C256 is performed on a page basis; 64 bytes of data are loaded into the device and then simultaneously programmed.
PAGE 3
AT29C256 PROGRAM: The device is reprogrammed on a page basis. If a byte of data within a page is to be changed, data for the entire page must be loaded into the device. Any byte that is not loaded during the programming of its page will be indeterminate. Once the bytes of a page 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.
PAGE 4
PRODUCT IDENTIFICATION: The product identification mode identifies the device and manufacturer and may be accessed by a hardware operation. For details, see Operating Modes or Product Identification. DATA POLLING: The AT29C256 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.
PAGE 5
AT29C256 DC and AC Operating Range Operating Temperature (Case) Com. Ind. VCC Power Supply Note: AT29C256-70 AT29C256-90 AT29C256-12 AT29C256-15 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 5V ± 5% 5V± 10% 5V± 10% 5V± 10% Not recommended for New Designs.
PAGE 6
AC Read Characteristics Symbol Parameter tACC AT29C256-70 AT29C256-90 AT29C256-12 AT29C256-15 Min Min Min Min Max Max Max Max Units Address to Output Delay 70 90 120 150 ns (1) CE to Output Delay 70 90 120 150 ns tOE(2) OE to Output Delay 0 40 0 40 0 50 0 70 ns CE or OE to Output Float 0 25 0 25 0 30 0 40 ns Output Hold from OE, CE or Address, whichever occurred first 0 tCE tDF (3)(4) tOH Note: 0 0 0 ns Not recommended for New Designs.
PAGE 7
AT29C256 Input Test Waveforms and Measurement Level tR, t F < 5 ns Output Test Load 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. This parameter is characterized and is not 100% tested.
PAGE 8
AC Byte Load Characteristics Symbol Parameter Min Max Units tAS, tOES Address, OE Set-up Time 0 ns tAH Address Hold Time 50 ns tCS Chip Select Set-up Time 0 ns tCH Chip Select Hold Time 0 ns tWP Write Pulse Width (WE or CE) 90 ns tDS Data Set-up Time 35 ns tDH,tOEH Data, OE Hold Time 0 ns tWPH Write Pulse Width High 100 ns AC Byte Load Waveforms WE Controlled CE Controlled 8 AT29C256 0046O–FLASH–06/02
PAGE 9
AT29C256 Program Cycle Characteristics Symbol Parameter Min Max Units tWC Write Cycle Time 10 ms tAS Address Set-up Time 0 ns tAH Address Hold Time 50 ns tDS Data Set-up Time 35 ns tDH Data Hold Time 0 ns tWP Write Pulse Width 90 ns tBLC Byte Load Cycle Time tWPH Write Pulse Width High 150 100 µs ns Program Cycle Waveforms(1)(2)(3) Notes: 1. A6 through A14 must specify the page address during each high-to-low transition of WE (or CE). 2.
PAGE 10
Software Data Protection Enable Algorithm(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 A0 TO ADDRESS 5555 WRITES ENABLED(2) LOAD DATA 80 TO ADDRESS 5555 ENTER DATA PROTECT STATE LOAD DATA AA TO ADDRESS 5555 LOAD DATA TO PAGE (64 BYTES)(4) Notes: Software Data Protection Disable Algorithm(1) 1. Data Format: I/O7 - I/O0 (Hex); Address Format: A14 - A0 (Hex). 2.
PAGE 11
AT29C256 Data Polling Characteristics(1) Symbol Parameter tDH Data Hold Time 0 ns tOEH OE Hold Time 10 ns tOE OE to Output Delay(2) tWR Write Recovery Time Notes: Min Typ Max Units ns 0 ns 1. These parameters are characterized and not 100% tested. 2. See tOE spec in AC Read Characteristics.
PAGE 12
Software Product Identification Entry(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 10 mS Notes: 12 Software Product Identification Exit(1) ENTER PRODUCT IDENTIFICATION MODE(2)(3)(5) PAUSE 10 mS EXIT PRODUCT IDENTIFICATION MODE(4) 1. Data Format: I/O7 - I/O0 (Hex); Address Format: A14 - A0 (Hex). 2. A1 - A14 = VIL.
PAGE 13
AT29C256 NORMALIZED SUPPLY CURRENT vs. TEMPERATURE 1.4 N O R M A L I Z E D 1.3 1.2 1.1 1.0 I 0.9 C C 0.8 -55 -25 5 35 65 95 125 TEMPERATURE (C) NORMALIZED SUPPLY CURRENT vs. ADDRESS FREQUENCY 1.1 N O R M 1.0 A L I 0.9 Z E D I C C VCC = 5V T = 25C 0.8 0.7 0 1 2 3 4 5 6 7 FREQUENCY (MHz) NORMALIZED SUPPLY CURRENT vs. SUPPLY VOLTAGE 1.4 N O R M 1.2 A L I 1.0 Z E D I C C 0.8 0.6 4.50 4.75 5.00 5.25 5.
PAGE 14
Ordering Information ICC (mA) tACC (ns) Active Standby Ordering Code Package 70 50 0.
PAGE 15
AT29C256 Packaging Information 32J – PLCC 1.14(0.045) X 45˚ PIN NO. 1 IDENTIFIER 1.14(0.045) X 45˚ 0.318(0.0125) 0.191(0.0075) E1 E2 B1 E B e A2 D1 A1 D A 0.51(0.020)MAX 45˚ MAX (3X) COMMON DIMENSIONS (Unit of Measure = mm) D2 Notes: 1. This package conforms to JEDEC reference MS-016, Variation AE. 2. Dimensions D1 and E1 do not include mold protrusion. Allowable protrusion is .010"(0.254 mm) per side.
PAGE 16
28P6 – PDIP D PIN 1 E1 A SEATING PLANE A1 L B B1 e E 0º ~ 15º C COMMON DIMENSIONS (Unit of Measure = mm) REF MIN NOM MAX A – – 4.826 A1 0.381 – – D 36.703 – 37.338 E 15.240 – 15.875 E1 13.462 – 13.970 B 0.356 – 0.559 B1 1.041 – 1.651 L 3.048 – 3.556 C 0.203 – 0.381 eB 15.494 – 17.526 SYMBOL eB Notes: 1. This package conforms to JEDEC reference MS-011, Variation AB. 2. Dimensions D and E1 do not include mold Flash or Protrusion.
PAGE 17
AT29C256 28T – TSOP PIN 1 0º ~ 5º c Pin 1 Identifier D1 D L b e L1 A2 E A GAGE PLANE SEATING PLANE COMMON DIMENSIONS (Unit of Measure = mm) A1 MIN NOM MAX A – – 1.20 A1 0.05 – 0.15 A2 0.90 1.00 1.05 D 13.20 13.40 13.60 D1 11.70 11.80 11.90 Note 2 E 7.90 8.00 8.10 Note 2 L 0.50 0.60 0.70 SYMBOL Notes: 1. This package conforms to JEDEC reference MO-183. 2. Dimensions D1 and E do not include mold protrusion. Allowable protrusion on E is 0.
PAGE 18
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