DS12887 Maxim, DS12887 Datasheet - Page 7

• Manufacturer Part Number: DS12887
• Description: The DS12885, DS12887, and DS12C887 real-time clocks (RTCs) are designed to be direct replacements for the DS1285 and DS1287
• Manufacturer: Maxim

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