AT49F020-90TC datasheet(1/10 Pages) ATMEL

Part #	AT49F020-90TC

Description	2-Megabit 256K x 8 5-volt Only CMOS Flash Memory

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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Features

• Single Voltage Operation

– 5V Read

– 5V Reprogramming

• Fast Read Access Time - 55 ns

• Internal Program Control and Timer

• 8K bytes Boot Block With Lockout

• Fast Erase Cycle Time - 10 seconds

• Byte By Byte Programming - 50

µs/Byte

• Hardware Data Protection

• DATA Polling For End Of Program Detection

• Low Power Dissipation

– 50 mA Active Current

– 100

µA CMOS Standby Current

• Typical 10,000 Write Cycles

Description

The AT49F020 is a 5-volt-only in-system Flash Memory. Its 2 megabits of memory is

organized as 262,144 words by 8 bits. Manufactured with Atmel’s advanced nonvola-

tile CMOS technology, the device offers access times to 55 ns with power dissipation

of just 275 mW over the commercial temperature range. When the device is dese-

lected, the CMOS standby current is less than 100

µA.

To allow for simple in-system reprogrammability, the AT49F020 does not require high

input voltages for programming. Five-volt-only commands determine the read and

programming operation of the device. Reading data out of the device is similar to

reading from an EPROM. Reprogramming the AT49F020 is performed by erasing the

entire 2 megabits of memory and then programming on a byte by byte basis. The byte

programming time is a fast 50

µs. The end of a program cycle can be optionally

detected by the DATA polling feature. Once the end of a byte program cycle has been

detected, a new access for a read or program can begin. The typical number of pro-

gram and erase cycles is in excess of 10,000 cycles.

2-Megabit

(256K x 8)

5-volt Only

CMOS Flash

Memory

AT49F020

0567B-A–8/97

Pin Configurations

Pin Name

Function

A0 - A17

Addresses

CE

Chip Enable

OE

Output Enable

WE

Write Enable

I/O0 - I/O7

Data Inputs/Outputs

NC

No Connect

DIP Top View

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2

3

4

5

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7

8

9

10

11

12

13

14

15

16

32

31

30

29

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27

26

25

24

23

22

21

20

19

18

17

NC

A16

A15

A12

A7

A6

A5

A4

A3

A2

A1

A0

I/O0

I/O1

I/O2

GND

VCC

WE

A17

A14

A13

A8

A9

A11

OE

A10

CE

I/O7

I/O6

I/O5

I/O4

I/O3

PLCC Top View

5

6

7

8

9

10

11

12

13

29

28

27

26

25

24

23

22

21

A7

A6

A5

A4

A3

A2

A1

A0

I/O0

A14

A13

A8

A9

A11

OE

A10

CE

I/O7

TSOP Top View

Type 1

1

2

3

4

5

6

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8

9

10

11

12

13

14

15

16

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

A11

A9

A8

A13

A14

A17

WE

VCC

NC

A16

A15

A12

A7

A6

A5

A4

OE

A10

CE

I/O7

I/O6

I/O5

I/O4

I/O3

GND

I/O2

I/O1

I/O0

A0

A1

A2

A3

(continued)

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