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PRELIMINARY DATA

January 1998

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

M48T39Y

s

INTEGRATED ULTRA LOW POWER SRAM,

REAL TIME CLOCK, POWER-FAIL CONTROL

CIRCUIT, BATTERY and CRYSTAL

s

BCD CODED YEAR, MONTH, DAY, DATE,

HOURS, MINUTES and SECONDS

s

AUTOMATIC POWER-FAIL CHIP DESELECT

and WRITE PROTECTION

s

WRITE PROTECT VOLTAGE

– M48T39Y: 4.20V

s

PROGRAMMABLE INTERRUPTS and

SQUARE WAVE OUTPUT

s

WATCHDOG TIMER RESTARTS on

OUT-OF-CONTROL PROCESSOR

s

CLOCK ACCURACY IS BETTER THAN

±1 MINUTE per MONTH at 25°C

s

10 YEARS of DATA RETENTION and CLOCK

OPERATION in the ABSENCE of POWER

s

SELF-CONTAINED BATTERY and CRYSTAL

in DIP PACKAGE

s

PROGRAMMABLE ALARM OUTPUT ACTIVE

in the BATTERY BACK-UP MODE

s

PIN and FUNCTION COMPATIBLE with

DS1386

DESCRIPTION

atile 262,144 bit static RAM and real time clock or-

ganized as 32,768 words by 8 bits. System

integration

features

include

Programmable

Alarms, Watchdog Timer and Interval Timer. The

special 32-pin DIP package provides a highly inte-

grated battery back-up memory and real time

clock solution.

Figure 1. Logic Diagram

AI02311

15

A0-A14

W

DQ0-DQ7

VCC

M48Z129Y

G

VSS

8

E

INTA

INTB

SQW

32

1

PMDIP32 (PM)

Module