CAT28C257P-90T 查看數據表（PDF） - Catalyst Semiconductor => Onsemi

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CAT28C257P-90T

256K-Bit CMOS PARALLEL EEPROM

Catalyst Semiconductor => Onsemi 

CAT28C257

256K-Bit CMOS PARALLEL EEPROM

FEATURES

■ Fast read access times: 120/150 ns

■ Low power CMOS dissipation:

–Active: 25 mA max.

–Standby: 150 µA max.

■ Simple write operation:

–On-chip address and data latches

–Self-timed write cycle with auto-clear

■ Fast write cycle time:

–5ms max

■ CMOS and TTL compatible I/O

ALOGEN FR

LEA D F REETM

■ Automatic page write operation:

–1 to 128 Bytes in 5ms

–Page load timer

■ End of write detection:

–Toggle bit

–DATA polling

■ Hardware and software write protection

■ 100,000 Program/erase cycles

■ 100 Year data retention

■ Commercial, industrial and automotive

temperature ranges

DESCRIPTION

The CAT28C257 is a fast, low power, 5V-only CMOS

Parallel EEPROM organized as 32K x 8-bits. It requires a

simple interface for in-system programming. On-chip

address and data latches, self-timed write cycle with auto-

clear and VCC power up/down write protection eliminate

additional timing and protection hardware. DATA Polling

and Toggle status bits signal the start and end of the self-

timed write cycle. Additionally, the CAT28C257 features

hardware and software write protection.

The CAT28C257 is manufactured using Catalyst’s

advanced CMOS floating gate technology. It is designed

to endure 100,000 program/erase cycles and has a data

retention of 100 years. The device is available in JEDEC

approved 28-pin DIP or 32-pin PLCC packages.

BLOCK DIAGRAM

A7–A14

VCC

CE

OE

WE

A0–A6

ADDR. BUFFER

& LATCHES

INADVERTENT

WRITE

PROTECTION

CONTROL

LOGIC

TIMER

ADDR. BUFFER

& LATCHES

ROW

DECODER

HIGH VOLTAGE

GENERATOR

DATA POLLING

AND

TOGGLE BIT

COLUMN

DECODER

32,768 x 8

EEPROM

ARRAY

128 BYTE PAGE

REGISTER

I/O BUFFERS

I/O0–I/O7

© 2004 by Catalyst Semiconductor, Inc.

Characteristics subject to change without notice

1

Doc. No. 1015, Rev. D

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