Rainbow Electronics DS12С887A User Manual
Page 2
DS12C887A
2 of 2
to clear the RAM,
RCLR
must be forced to an input logic 0 (-0.3V to +0.8V) during battery-backup mode
when V
CC
is not applied. The
RCLR
function is designed to be used via human interface (shorting to
ground manually or by switch) and not to be driven with external buffers.
For a complete description of operating conditions, electrical characteristics, bus timing and pin
descriptions other than
RCLR
, see the DS12C887 data sheet.
DS12C887 REAL-TIME CLOCK PLUS RAM
PKG
24-PIN
DIM
MIN
MAX
A IN.
1.320
1.335
MM
33.53
33.91
B IN.
0.675
0.700
MM
17.15
17.78
C IN.
0.345
0.370
MM
8.76
9.40
D IN.
0.100
0.130
MM
2.54
3.30
E IN.
0.015
0.030
MM
0.38
0.76
F IN.
0.110
0.140
MM
2.79
3.56
G IN.
0.090
0.110
MM
2.29
2.79
H IN.
0.590
0.630
MM
14.99
16.00
J IN.
0.008
0.012
MM
0.20
0.30
K IN.
0.015
0.021
MM
0.38
0.53
.
Note:
Pins 2, 3, 16, 20, and 22 are missing by design.
This device cannot be stored or shipped in conductive
material that will give a continuity path between the RAM
clear pin and ground.