Datasheet > 25AA640/ST

25AA640/ST

更新时间： 2024-09-19 10:09:03

品牌	Logo	应用领域
美国微芯 - MICROCHIP		可编程只读存储器电动程控只读存储器电可擦编程只读存储器光电二极管
页数	文件大小	规格书
12页	211K
描述
8K X 8 SPI BUS SERIAL EEPROM, PDSO8, TSSOP-8

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中文翻译

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数据手册

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25AA640/ST 数据手册

25AA640/25LC640

64K SPI Bus Serial EEPROM

™

PACKAGE TYPES

DEVICE SELECTION TABLE

Part

Number

VCC

Range

Max Clock

Frequency

Temp

Ranges

PDIP/SOIC

VCC

HOLD

SCK

25AA640

25LC640

1.8-5.5V

2.5-5.5V

4.5-5.5V

1 MHz

2 MHz

C,I

3/2.5 MHz

C,I/E

VSS

FEATURES

• Low power CMOS technology

- Write current: 3 mA typical

- Read current: 500 µA typical

- Standby current: 500 nA typical

• 8192 x 8 bit organization

• 32 byte page

• Write cycle time: 5ms max.

• Self-timed ERASE and WRITE cycles

• Block write protection

TSSOP

SCK

VSS

HOLD

VCC

- Protect none, 1/4, 1/2, or all of array

• Built-in write protection

- Power on/off data protection circuitry

- Write enable latch

BLOCK DIAGRAM

Status

HV Generator

- Write protect pin

• Sequential read

• High reliability

- Data retention: > 200 years

- ESD protection: > 4000 V

• 8-pin PDIP, SOIC, and TSSOP packages

• Temperature ranges supported:

EEPROM

Array

Memory

Control

Logic

I/O Control

Logic

- Commercial (C):

- Industrial (I):

0°C to +70°C

-40°C to +85°C

-40°C to +125°C

Dec

- Automotive (E):

Page Latches

DESCRIPTION

The Microchip Technology Inc. 25AA640/25LC640

(25xx640 ) is a 64K bit Serial Electrically Erasable

Y Decoder

PROM [EEPROM].The memory is accessed via a sim-

ple Serial Peripheral Interface (SPI) compatible serial

bus. The bus signals required are a clock input (SCK)

plus separate data in (SI) and data out (SO) lines.

Access to the device is controlled through a chip select

(CS) input.

SCK

Sense Amp.

R/W Control

HOLD

VCC

VSS

Communication to the device can be paused via the

hold pin (HOLD). While the device is paused, transi-

tions on its inputs will be ignored, with the exception of

chip select, allowing the host to service higher priority

interrupts.

*25xx640 is used in this document as a generic part number for the 25AA640/25LC640 devices.

SPI is a trademark of Motorola.

1999 Microchip Technology Inc.

Preliminary

DS21223D-page 1

12 3 4 5 6 7...12

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