DS1385 Datasheet, PDF (3/20 Pages) Dallas Semiconductor – RAMified Real Time Clock 4K x 8

DS1385/DS1387 BLOCK DIAGRAM Figure 1
X1 X2
OSC
DS1385/DS1387
8
64
64
CS
V_CC
POWER
SWITCH
V_CC
AND
WRITE
PROTECT
POK
V_BAT
+
+3V _–
BUFFER
ENABLE
ALE
RD
WR
CS
AD0-AD7
BUS
INTERFACE
AS1
AS0
WER
OER
PERIODIC INTERRUPT/SQUARE WAVE
SELECTOR
SQUARE
WAVE OUT
SQW
CLOCK/
CALENDAR
UPDATE
BCD/BINARY
INCREMENT
CONTROL
REGISTERS A, B, C, D
CLOCK, CALENDAR,
AND ALARM
IRQ
DOUBLE
BUFFERED
USER RAM
50 BYTES
ADDRESS HIGH
BYTE LATCH
ADDRESS LOW
BYTE LATCH
DATA LATCH
NONVOLATILE RAM
4K X 8
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