DS12885_10 Datasheet, PDF (7/22 Pages) Maxim Integrated Products – Real-Time Clocks

(V_CC = +5.0V, T_A = +25°C, unless otherwise noted.)
I_BAT1 vs. V_BAT
vs. TEMPERATURE
V_CC = 0V
300
+85°C
250
+70°C
200
+25°C
0°C
+40°C
-40°C
150
2.5 2.8 3.0 3.3 3.5 3.8 4.0
V_BAT (V)
Real-Time Clocks
Typical Operating Characteristics
OSCILLATOR FREQUENCY
vs. VCC
32768.70
32768.60
32768.50
32768.40
32768.30
32768.20
32768.10
32768.00
4.5
4.8
5.0
5.3
5.5
VCC (V)
X1
X2
V_CC
GND
V_BAT
CS
R/W
DS
AS
MOT
RESET
AD0–AD7
RLCR
OSC
POWER
CONTROL
BUS
INTERFACE
Functional Diagram
DIVIDE
BY 8
DIVIDE
BY 64
16:1 MUX
DS12885
DIVIDE
BY 64
SQUARE-
SQW
WAVE
GENERATOR
IRQ
IRQ
GENERATOR
CLOCK/CALENDAR
UPDATE LOGIC
REGISTERS A, B, C, D
CLOCK/CALENDAR AND
ALARM REGISTERS
BUFFERED CLOCK/
CALENDAR AND ALARM
REGISTERS
USER RAM
114 BYTES
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