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DS1251

4096K NV SRAM with Phantom Clock

Unspecified 

DS1251/DS1251P

4096K NV SRAM with Phantom Clock

FEATURES

z Real-time clock keeps tracks of hundredths of seconds,

minutes, hours, days, date of the month, months, and years

z 512k x 8NV SRAM directly replaces volatile static RAM or

EEPROM

z Embedded lithium energy cell maintains calendar operation

and retains RAM data

z Watch function is transparent to RAM operation

z Month and year determine the number of days in each

month; valid up to 2100

z Over 10 years of data retention in the absence of power

z Full 10% operating range

z Lithium energy source is electrically disconnected to retain

freshness until power is applied for the first time

z DIP Module only

-Standard 32-pin JEDEC pinout

-Upward comparable with the DS1248

z PowerCap ® Module Board only

-Surface mountable package for direct connection to

PowerCap containing battery and crystal

-Replaceable battery (PowerCap)

-Pin for pin compatible with other densities of DS124XP

phantom clocks

PIN ASSIGNMENT

ORDERING INFORMATION

*DS9034PCX (PowerCap) Required:

(Must be ordered separately.)

www.artschip.com

34-Pin PowerCap Module Board

(Uses DS9034PCX PowerCap)

PIN DESCRIPTION

A0-A18

Vcc

GND

DQ0-DQ7

NC

X1, X2

VBAT

-Address Inputs

-Chip Enable

-Output Enable

-Write Enable

-Power Supply Input

-Ground

-Data In/Data Out

-No Connection

-Crystal Connection

-Battery Connection

-Reset

1

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