Datasheet > U637256

U637256

更新时间： 2024-11-09 03:57:31

品牌	Logo	应用领域
SIMTEK		静态存储器
页数	文件大小	规格书
14页	255K
描述
CapStore 32K x 8 nvSRAM

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中文翻译

获取价格

数据手册

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U637256 数据手册

U637256

CapStore 32K x 8 nvSRAM

Not Recommend For New Designs

Features

Description

integrity.

CMOS non volatile static RAM

32768 x 8 bits

70 ns Access Time

35 ns Output Enable Access

Time

The U637256 has two separate

modes of operation: SRAM mode

and nonvolatile mode. In SRAM

mode, the memory operates as an

ordinary static RAM. In nonvolatile

operation, data is transferred in

parallel from SRAM to EEPROM or

from EEPROM to SRAM. In this

mode SRAM functions are disab-

led.

The U637256 is a static RAM with

a nonvolatile electrically erasable

PROM (EEPROM) element incor-

porated in each static memory cell.

The SRAM can be read and written

an unlimited number of times, while

independent nonvolatile data resi-

des in EEPROM. Data transfers

from the SRAM to the EEPROM

(the STORE operation) take place

automatically upon power down

using charge stored in an integraed

capacitor. Transfers from the

EEPROM to the SRAM (the

RECALL operation) take place

automatically on power up. The

U637256 combines the ease of use

STORE cycles also may be initia-

ted under user control via a soft-

ware sequence.

Once a STORE cycle is initiated,

further input or output are disabled

until the cycle is completed.

Because a sequence of addresses

is used for STORE initiation, it is

important that no other read or

write accesses intervene in the

sequence or the sequence will be

aborted.

RECALL cycles may also be initia-

ted by a software sequence.

Internally, RECALL is a two step

procedure. First, the SRAM data is

cleared and second, the nonvola-

tile information is transferred into

the SRAM cells.

The RECALL operation in no way

alters the data in the EEPROM

cells. The nonvolatile data can be

recalled an unlimited number of

times.

The U637256 is pin compatible

with standard SRAMs and standard

battery backed SRAMs.

I_CC= 15 mA typ. at 200 ns Cycle

Time

Unlimited Read and Write Cycles

to SRAM

Automatic STORE to EEPROM

on Power Down using charge

stored in an integrated capacitor

Software initiated STORE

Automatic STORE Timing

10⁶STORE cycles to EEPROM

100 years data retention in

EEPROM

Automatic RECALL on Power Up

Software RECALL Initiation

Unlimited RECALL cycles from

EEPROM

Single 5 V ± 10 % Operation

Operating temperature range:

0 to 70 °C

-40 to 85°C

QS 9000 Quality Standard

(MIL STD 883C M3015.7)

RoHS compliance and Pb- free

Package: PDIP28 (600 mil)

of an SRAM with nonvolatile data

Pin Description

Pin Configuration

A14

A12

VCC

A13

Signal Name Signal Description

A0 - A14

Address Inputs

Data In/Out

A11

DQ0 - DQ7

Chip Enable

PDIP

A10

Output Enable

Write Enable

Power Supply Voltage

Ground

DQ7

DQ6

VCC

VSS

DQ0

DQ1

DQ2

VSS

DQ5

DQ4

DQ3

Top View

August 15, 2006

STK Control #ML0054

Rev 1.1

12 3 4 5 6 7...14

中文翻译

下载PDF

与U637256相关器件

型号	品牌	获取价格	描述	数据表
U637256DC70	CYPRESS	获取价格	32KX8 NON-VOLATILE SRAM, 70ns, PDIP28, 0.600 INCH, PLASTIC, DIP-28
U637256DC70G1	SIMTEK	获取价格	CapStore 32K x 8 nvSRAM
U637256DK70G1	SIMTEK	获取价格	CapStore 32K x 8 nvSRAM
U63764	SIMTEK	获取价格	CapStore 8K x 8 nvSRAM
U63764DC70	SIMTEK	获取价格	CapStore 8K x 8 nvSRAM
U63764DC70G1	SIMTEK	获取价格	CapStore 8K x 8 nvSRAM
U63764DK70	SIMTEK	获取价格	CapStore 8K x 8 nvSRAM
U63764DK70G1	SIMTEK	获取价格	CapStore 8K x 8 nvSRAM
U637H256	SIMTEK	获取价格	CapStore 32K x 8 nvSRAM
U637H256D1C25	SIMTEK	获取价格	32KX8 NON-VOLATILE SRAM, 25ns, PDIP28, 0.600 INCH, PLASTIC, DIP-28

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