DS12885/DS12887/DS12887A/DS12C887/DS12C887A
Real-Time Clock
_____________________________________________________________________
7
Typical Operating Characteristics
(V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
OSCILLATOR FREQUENCY
vs. V
CC
DS12885 toc02
V
CC
(V)
FREQUENCY (Hz)
5.3
5.0
4.8
32768.10
32768.20
32768.30
32768.40
32768.50
32768.60
32768.70
32768.00
4.5
5.5
I
BAT1
vs. V
BAT
vs. TEMPERATURE
DS12885 toc01
V
BAT
(V)
I
BAT
(nA)
3.8
2.8
3.0
3.3
3.5
200
300
250
150
2.5
4.0
V
CC
= 0V
+85
°
C
+25
°
C
0
°
C
-40
°
C
+70
°
C
+40
°
C
POWER
CONTROL
GND
OSC
BUS
INTERFACE
V
CC
X1
X2
RESET
CS
DS
AS
R/W
MOT
AD0–AD7
DIVIDE
BY 8
DIVIDE
BY 64
DIVIDE
BY 64
16:1 MUX
SQUARE-
WAVE
GENERATOR
REGISTERS A, B, C, D
CLOCK/CALENDAR AND
ALARM REGISTERS
USER RAM
114 BYTES
CLOCK/CALENDAR
UPDATE LOGIC
IRQ
SQW
IRQ
GENERATOR
BUFFERED CLOCK/
CALENDAR AND ALARM
REGISTERS
V
BAT
RLCR
DS12885
Functional Diagram
