DS17285_1 Datasheet, PDF (10/31 Pages) Maxim Integrated Products – Real-Time Clocks

Real-Time Clocks
X1
OSCILLATOR
X2
DIVIDE
BY 8
DIVIDE BY
64
DIVIDE BY
64
DS17x87
ONLY
V_BAT
GND
V_CC
V_BAUX
POWER
CONTROL
16:1 MUX
SQUARE-
WAVE
SQW
GENERATOR
IRQ
GENERATOR
IRQ
PWR
KS
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
RLCR
Figure 1. Functional Diagram
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