Philips HEF4541BU, HEF4541BT, HEF4541BPB, HEF4541BP, HEF4541BDB Datasheet

DATA SH EET

Product specification
File under Integrated Circuits, IC04

January 1995

INTEGRATED CIRCUITS

HEF4541B
MSI

Programmable timer

For a complete data sheet, please also download:

•The IC04 LOCMOS HE4000B Logic
Family Specifications HEF, HEC

•The IC04 LOCMOS HE4000B Logic
Package Outlines/Information HEF, HEC

January 1995 2

Philips Semiconductors Product specification

Programmable timer

HEF4541B

MSI

DESCRIPTION

The HEF4541B is a programmable timer which consists of
a 16-stage binary counter, an integrated oscillator to be
used with external timing components, an automatic
power-on reset and output control logic. The frequency of
the oscillator is determined by the external components
Rtand Ctwithin the frequency range 1 Hz to 100 kHz. This
oscillator may be replaced by an external clock signal at
input RS, the timer advances on the positive-going
transition of RS. A LOW on the auto reset input (AR) and
a LOW on the master reset input (MR) enables the internal
power-on reset. A HIGH level at input MR resets the
counter independent on all other inputs. Resetting

disables the oscillator to provide no active power
dissipation.
A HIGH at input

AR turns off the power-on reset to provide
a low quiescent power dissipation of the timer. The
16-stage counter divides the oscillator frequency by
28,210,213or 216depending on the state of the address
inputs (A0,A1). The divided oscillator frequency is
available at output O. The phase input (PH) features a
complementary output signal. If the mode select input
(MODE) is LOW or HIGH the timer can be used
respectively as a single transition timer or 2nfrequency
divider.

Fig.1 Functional diagram.

Fig.2 Pinning diagram.

FAMILY DATA, IDDLIMITS category MSI

See Family Specifications

HEF4541BP(N): 14-lead DIL; plastic

(SOT27-1)

HEF4541BD(F): 14-lead DIL; ceramic (cerdip)

(SOT73)

HEF4541BT(D): 14-lead SO; plastic

(SOT108-1)

( ): Package Designator North America

January 1995 3

Philips Semiconductors Product specification

Programmable timer

HEF4541B

MSI

Fig.3 Logic diagram.