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Features

• Fast Read Access Time – 70 ns

• 5-volt Only Reprogramming

• Sector Program Operation

– Single Cycle Reprogram (Erase and Program)

– 1024 Sectors (256 Bytes/Sector)

– Internal Address and Data Latches for 256 Bytes

• Internal Program Control and Timer

• Hardware and Software Data Protection

• Two 8K Bytes Boot Blocks with Lockout

• FastSectorProgramCycleTime–10ms

• DATA Polling for End of Program Detection

• Low Power Dissipation

– 40mAActiveCurrent

– 100 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 AT29C020 is a 5-volt-only in-system Flash programmable and erasable read-only

memory (PEROM). Its 2 megabits of memory is organized as 262,144 bytes. Manu-

factured with Atmel’s advanced nonvolatile CMOS technology, the device offers

access times to 70 ns with power dissipation of just 220 mW over the commercial tem-

perature range. When the device is deselected, the CMOS standby current is less

than 100 µA. Device endurance is such that any sector can typically be written to in

excess of 10,000 times.

2-megabit

(256K x 8)

5-volt Only

Flash Memory

AT29C020

Rev. 0291N–FLASH–07/02

Pin Configurations

Pin Name Function

A0 - A17 Addresses

Chip Enable

Output Enable

Write Enable

I/O0 - I/O7 Data Inputs/Outputs

NC No Connect

DIP Top View

PLCC Top View

A16

A15

A12

I/O0

I/O1

I/O2

GND

VCC

A17

A14

A13

A11

A10

I/O7

I/O6

I/O5

I/O4

I/O3

I/O0

A14

A13

A11

A10

I/O7

I/O1

I/O2

GND

I/O3

I/O4

I/O5

I/O6

A12

A15

A16

VCC

A17

TSOP Top View

Type 1

A11

A13

A14

A17

VCC

A16

A15

A12

A10

I/O7

I/O6

I/O5

I/O4

I/O3

GND

I/O2

I/O1

I/O0

Summary of content (17 pages)

PAGE 1
Features • Fast Read Access Time – 70 ns • 5-volt Only Reprogramming • Sector Program Operation • • • • • • • • • • – Single Cycle Reprogram (Erase and Program) – 1024 Sectors (256 Bytes/Sector) – Internal Address and Data Latches for 256 Bytes Internal Program Control and Timer Hardware and Software Data Protection Two 8K Bytes Boot Blocks with Lockout Fast Sector Program Cycle Time – 10 ms DATA Polling for End of Program Detection Low Power Dissipation – 40 mA Active Current – 100 µA CMOS Standby Curren
PAGE 2
To allow for simple in-system reprogrammability, the AT29C020 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 an EPROM. Reprogramming the AT29C020 is performed on a sector basis; 256 bytes of data are loaded into the device and then simultaneously programmed.
PAGE 3
AT29C020 SOFTWARE DATA PROTECTION: A software controlled data protection feature is available on the AT29C020. Once the software protection is enabled a software algorithm must be issued to the device before a program may be performed. The software protection feature may be enabled or disabled by the user; when shipped from Atmel, the software data protection feature is disabled.
PAGE 4
BOOT BLOCK PROGRAMMING LOCKOUT: The AT29C020 has two designated memory blocks that have a programming lockout feature. This feature prevents programming of data in the designated block once the feature has been enabled. Each of these blocks consists of 8K bytes; the programming lockout feature can be set independently for either block. While the lockout feature does not have to be activated, it can be activated for either or both blocks. These two 8K memory sections are referred to as boot blocks.
PAGE 5
AT29C020 DC and AC Operating Range Operating Temperature (Case) Com. Ind. VCC Power Supply AT29C020-70 AT29C020-90 AT29C020-10 AT29C020-12 AT29C020-15 0°C - 70°C 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 -40°C - 85°C 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10% Not recommended for New Designs.
PAGE 6
AC Read Characteristics AT29C020-90 Symbol Parameter tACC Address to Output Delay AT29C020-90 AT29C020-10 Min Max Min Max 0 70 0 90 100 90 100 Min Max AT29C020-12 Min AT29C020-15 Max Units 120 150 ns 120 150 ns Max Min (1) CE to Output Delay tOE(2) OE to Output Delay 0 40 0 40 0 50 0 50 0 70 ns CE or OE to Output Float 0 25 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: 70 0 0 0
PAGE 7
AT29C020 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 50 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 AT29C020 0291N–FLASH–07/02
PAGE 9
AT29C020 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 50 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. A8 through A17 must specify the sector address during each high-to-low transition of WE (or CE). 2.
PAGE 10
Software Data Protection Enable Algorithm() Software Data Protection Disable Algorithm() 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 LOAD DATA 80 TO ADDRESS 5555 LOAD DATA TO PAGE (128 BYTES)(4) ENTER DATA PROTECT STATE(2) LOAD DATA AA TO ADDRESS 5555 LOAD DATA 55 TO ADDRESS 2AAA LOAD DATA 20 TO ADDRESS 5555 EXIT DATA PROTECT STATE(3) LOAD DATA TO PAGE (128 BYTES)(4) Notes: 1.
PAGE 11
AT29C020 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.
PAGE 12
Software Product Identification Entry(1) LOAD DATA AA TO ADDRESS 5555 Boot Block Lockout Feature Enable Algorithm(1) LOAD DATA AA TO ADDRESS 5555 LOAD DATA 55 TO ADDRESS 2AAA LOAD DATA 55 TO ADDRESS 2AAA LOAD DATA 90 TO ADDRESS 5555 PAUSE 10 mS LOAD DATA 80 TO ADDRESS 5555 ENTER PRODUCT IDENTIFICATION MODE(2)(3)(5) LOAD DATA AA TO ADDRESS 5555 Software Product Identification Exit(1) LOAD DATA AA TO ADDRESS 5555 LOAD DATA 55 TO ADDRESS 2AAA LOAD DATA 55 TO ADDRESS 2AAA LOAD DATA 40 TO ADDRESS 555
PAGE 13
AT29C020 Ordering Information ICC (mA) tACC (ns) Active Standby Ordering Code Package 70 40 0.1 AT29C020-70JC AT29C020-70PC AT29C020-70TC 32J 32P6 32T Commercial (0° to 70°C) 40 0.1 AT29C020-70JI AT29C020-70PI AT29C020-70TI 32J 32P6 32T Industrial (-40° to 85°C) 40 0.1 AT29C020-90JC AT29C020-90PC AT29C020-90TC 32J 32P6 32T Commercial (0° to 70°C) 40 0.1 AT29C020-90JI AT29C020-90PI AT29C020-90TI 32J 32P6 32T Industrial (-40° to 85°C) 40 0.
PAGE 14
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 15
AT29C020 32P6 – PDIP D PIN 1 E1 A SEATING PLANE A1 L B B1 e E 0º ~ 15º C COMMON DIMENSIONS (Unit of Measure = mm) REF SYMBOL eB Note: 1. Dimensions D and E1 do not include mold Flash or Protrusion. Mold Flash or Protrusion shall not exceed 0.25 mm (0.010"). MIN NOM MAX A – – 4.826 A1 0.381 – – D 41.783 – 42.291 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.
PAGE 16
32T – TSOP PIN 1 0º ~ 8º 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 0.95 1.00 1.05 D 19.80 20.00 20.20 D1 18.30 18.40 18.50 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-142, Variation BD. 2. Dimensions D1 and E do not include mold protrusion. Allowable protrusion on E is 0.
PAGE 17
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