January 1995

2

Philips Semiconductors

Product specification

Universal timer module

HEF4753B

LSI

DESCRIPTION

The HEF4753B is a universal timer module for counting

and dividing as well as for event-recognition and

manipulation of input sequences.

The following functions are included: synchronization and

edge-detection of the input signal, programmable counter,

clock divider with different lengths, operating mode

decoder, control logic and output multiplexer.

Depending on the operating mode and the application, the

circuit works as a presettable 8-bit counter with

transient-pulse suppression, pulse duration selector

divider, counter, positive or negative edge delaying

module or low-frequency control circuit.

All manipulation possibilities depend on a time scaling,

which is adjustable by the 8-bit programmable counter and

the system clock. The system clock can be divided

internally by 1, 16, 256 or 4096 as input clock for the

counter. In all cases the manipulated input sequence

appears at the only output OUT.

See Family Specifications

Fig.1 Functional diagram.