DS17887-3 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

DS17887-3

Real-Time Clocks

Maxim Integrated 

Real-Time Clocks

DS17x87

ONLY

VBAT

X1

OSCILLATOR

X2

GND

VCC

VBAUX

POWER

CONTROL

DIVIDE

BY 8

DIVIDE BY

64

DIVIDE BY

64

16:1 MUX

SQUARE-

WAVE

GENERATOR

IRQ

GENERATOR

CS

WR

RD

ALE

AD0–AD7

BUS

INTERFACE

DS17x85/87

CLOCK/CALENDAR

UPDATE LOGIC

REGISTERS A, B, C, D

CLOCK/CALENDAR AND

ALARM REGISTERS

BUFFERED CLOCK/

CALENDAR AND ALARM

REGISTERS

USER RAM

114 BYTES

RAM

CLEAR

LOGIC

EXTENDED

USER RAM

2k/4k/8k

BYTES

SELECT

EXTENDED RAM ADDR/

DATA REGISTERS

EXTENDED CONTROL/

STATUS REGISTERS

64-BIT SERIAL NUMBER

CENTURY COUNTER

DATE ALARM

RTC ADDRESS-2

RTC ADDRESS-3

Figure 1. Functional Diagram

10 ____________________________________________________________________

SQW

IRQ

PWR

KS

RLCR

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