Datasheet

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