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DS-M959-R3

M-959

Dial Pulse Counter and Hook Status Monitor

1

Description

The M-959 is a low-power dial pulse counter and

hook status monitor. Contained in a 14-pin package,

the M-959 requires no external components except a

single 3.579 MHz television color burst crystal.

The M-959 is typically connected to a loop current

sensing circuit, which is connected in series with the

voice pair (Tip and Ring) of a telephone line. The M-

959 receives pulses from the loop current sense cir-

cuit and translates them into logic level outputs

indicating hook status and decoded dialed digits.

Logic inputs to the M-959 select dialed digit speeds

and control Data and Strobe outputs supporting bus

interrupt driven implementations.

environments

Features

Pin Diagram

Ordering Information

Part #

Description

M-959

14-pin plastic DIP

Block Diagram