AT49F020-70JI Datasheet

IC型號：
AT49F020-70JI
PDF描述：
2-Megabit 256K x 8 5-volt Only CMOS Flash Memory
文件大?。?/label>
87.35KB
PDF頁數：
10頁
芯片廠家：
ATMEL

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Features

鈥?/div>

Single Voltage Operation

鈥?/div>

鈥?5V Read

鈥?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

碌s/Byte

Hardware Data Protection

DATA Polling For End Of Program Detection

Low Power Dissipation

鈥?50 mA Active Current

鈥?100

碌A

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鈥檚 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

碌

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

碌

s. 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.

(continued)

2-Megabit

(256K x 8)

5-volt Only

CMOS Flash

Memory

AT49F020

Pin Configurations

Pin Name

A0 - A17

I/O0 - I/O7

Function

Addresses

Chip Enable

Output Enable

Write Enable

Data Inputs/Outputs

No Connect

PLCC Top View

A11

A13

A14

A17

VCC

A16

A15

A12

DIP 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

TSOP Top View

Type 1

A10

I/O7

I/O6

I/O5

I/O4

I/O3

GND

I/O2

I/O1

I/O0

I/O1

I/O2

GND

I/O3

I/O4

I/O5

I/O6

I/O0

A12

A15

A16

VCC

A17

A14

A13

A11

A10

I/O7

0567B-A鈥?/97

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