
DS1302 Trickle-Charge Timekeeping Chip
3 of 13
Figure 1. Block Diagram
POWER
CONTROL
v
CC1
v
CC2
GND
INPUT SHIFT
REGISTERS
I/O
SCLK
COMMAND AND
CONTROL LOGIC
REAL TIME
CLOCK
31 X 8 RAM
X1
X2
CE
1Hz
C
L
C
L
DS1302
TYPICAL OPERATING CHARACTERISTICS
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
ICC2T vs. VCC2T
5
10
15
20
25
30
2.03.0
4.05.0
VCC2 (V)
SUPPL
YCURRENT
(u
A)
ICC1T vs. VCC1T
100
150
200
250
300
350
400
2.0
3.0
4.0
5.0
VCC1 (V)
SUPPL
YCURRENT
(n
A)