DS1244Y-70 Ver la hoja de datos (PDF) - Unspecified

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DS1244Y-70

256k NV SRAM with Phantom Clock

Unspecified 

FEATURES

z Real-time clock (RTC) keeps track of hundredths of

seconds, minutes, hours, days, date of the month, months,

and years.

z 32k x 8 NV 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 Full 10% operating range

z Operating temperature range: 0℃ to +70℃

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

z Lithium energy source is electrically disconnected to retain

freshness until power is applied for the first time

z DIP module only

z Standard 28-pin JEDEC pinout

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 DS1248P

and DS1251P

z Underwriters Laboratory (UL) recognized

DS1244/DS1244P

256k NV SRAM

with Phantom Clock

PIN ASSIGNMENT (Top View)

PIN DESCRIPTION

A0-A14

Vcc

GND

DQ0-DQ7

N.C.

X1, X2

VBAT

www.artschip.com

DS2144P

34-Pin PowerCap Module

(Uses DS9034PCX PowerCap)

-Address Inputs

-Chip Enable

-Output Enable

-Write Enable

-Power-Supply Input

-Ground

-Data In/Data Out

-No Connection

-Crystal Connection

-Battery Connection

-Reset

TYPICAL OPERATING CIRCUIT

1

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