Rainbow-electronics DS12С887A Uživatelský manuál stáhnout pdf (Strana 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

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

33.53 33.91

B IN.

0.675 0.700

17.15 17.78

C IN.

0.345 0.370

8.76 9.40

D IN.

0.100 0.130

2.54 3.30

E IN.

0.015 0.030

0.38 0.76

F IN.

0.110 0.140

2.79 3.56

G IN.

0.090 0.110

2.29 2.79

H IN.

0.590 0.630

14.99 16.00

J IN.

0.008 0.012

0.20 0.30

K IN.

0.015 0.021

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.

1 2

DS12C887 1
Real-Time Clock 1

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