Datasheet > 存储 > EEPROM> 25AA640-E/ST

25AA640-E/ST

更新时间： 2024-11-07 04:25:35

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
页数	文件大小	规格书
24页	342K
描述
64K SPI Bus Serial EEPROM

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数据手册

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25AA640-E/ST 数据手册

25AA640/25LC640

64K SPI^™Bus Serial EEPROM

Device Selection Table

Description

The Microchip Technology Inc. 25AA640/25LC640

Part

Number

VCC

Range

Max Clock

Frequency

Temp

Ranges

(25XX640^*) is a 64 Kbit Serial Electrically Erasable

PROM [EEPROM]. The memory is accessed via a

simple 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.

25AA640

25LC640

1.8-5.5V

2.5-5.5V

4.5-5.5V

1 MHz

2 MHz

3/2.5 MHz

I, E

Features

Communication to the device can be paused via the

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

transitions on its inputs will be ignored, with the

exception of Chip Select, allowing the host to service

higher priority interrupts.

• 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

Block Diagram

Status

• Write cycle time: 5 ms max.

• Self-timed erase and write cycles

• Block write protection

HV Generator

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

• Built-in write protection

EEPROM

- Power on/off data protection circuitry

- Write enable latch

Memory

Control

Logic

I/O Control

Logic

Array

XDEC

- Write-protect pin

Page

Latches

• Sequential read

• High reliability

- Data retention: > 200 years

- ESD protection: > 4000V

• 8-pin PDIP, SOIC and TSSOP packages

• Temperature ranges supported:

- Industrial (I): -40°C to +85°C

- Automotive (E): -40°C to +125°C

Y Decoder

SCK

Sense Amp.

R/W Control

HOLD

VCC

VSS

Package Types

PDIP/SOIC

TSSOP

VCC

HOLD

SCK

VSS

HOLD

VCC

VSS

*25XX640 is used in this document as a generic part number for the 25AA640/25LC640 devices.

SPI is a registered trademark of Motorola Corporation.

 2004 Microchip Technology Inc.

DS21223G-page 1

12 3 4 5 6 7...24

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