DS17285E-3(1998) 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS17285E-3
(Rev.:1998)

3 Volt/5 Volt Real Time Clock

Dallas Semiconductor -> Maxim Integrated 

DS17285/DS17287

DS17285/DS17287 BLOCK DIAGRAM Figure 1

32.768 KHz

X1 X2

OSC

8

64

64

CS

VCC

VBAUX

VCC LEVEL

DETECT

POWER

SWITCH

AND

WRITE

PROTECT

VCC

POK

VBAT

+

+3V

–

BUFFER

ENABLE

ALE

RD

WR

CS

AD0-AD7

BUS

INTERFACE

PERIODIC INTERRUPT/SQUARE WAVE

SELECTOR

SQUARE

WAVE OUT

POWER

CONTROL

LOGIC

SQW

PWR

KS

CLOCK/

CALENDAR

UPDATE

CONTROL

REGISTERS A, B, C, D

CLOCK, CALENDAR,

AND ALARM

IRQ

DOUBLE

BUFFERED

BCD/BINARY

INCREMENT

USER RAM

114 BYTES

RAM

CLEAR

LOGIC

RCLR

SELECT

EXTENDED

USER RAM

2K BYTES

EXTENDED RAM ADDR/DATA

REGISTERS

EXTENDED CONTROL/STATUS

REGISTERS

64–BIT SERIAL NUMBER

CENTURY COUNTER

DATE ALARM

RTC ADDRESS – 2

RTC ADDRESS – 3

RTC WRITE COUNTER

030598 4/32

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