DS1318 Datasheet, PDF (7/15 Pages) Dallas Semiconductor – Parallel-Interface Elapsed Time Counter

Parallel-Interface Elapsed Time Counter
Functional Diagram
X1
X2
EXT
V_CC
V_BAT
CE
OE
WE
A3–A0
DQ7–DQ0
32,768Hz CRYSTAL OSCILLATOR
AND PRESCALER COUNTER
V_CC LEVEL DETECT,
POWER SWITCH,
AND WRITE PROTECT
BYTE-WIDE RAM
INTERFACE
4,096Hz
4,096Hz
SUBSECONDS0
SUBSECONDS1
SECONDS0
SECONDS1
SECONDS2
SECONDS3
INTERNAL DIVIDERS
AND COUNTERS
32,768Hz
CLOCK CONTROL CIRCUITRY
BUFFERED COUNTER REGISTERS,
CONTROL AND STATUS REGISTERS
SUBSECONDS0
SUBSECONDS1
SECONDS0
SECONDS1
SECONDS2
SECONDS3
ALARM0
ALARM1
ALARM2
ALARM3
CONTROL A
CONTROL B
STATUS
SQUARE-WAVE
RATE SELECTOR
SQW
AND PRESCALER
DS1318
PF/ALMF MUX
IRQ
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