Philips HEF4518BU, HEF4518BT, HEF4518BPB, HEF4518BP, HEF4518BDB Datasheet

INTEGRATED CIRCUITS

DATA SHEET

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

HEF4518B

MSI

Dual BCD counter

Product specification			January 1995
File under Integrated Circuits, IC04

Philips Semiconductors	Product specification

Dual BCD counter

HEF4518B

MSI

DESCRIPTION

T he HEF4518B is a dual 4-bit internally synchronous BCD counter. The counter has an active HIGH clock input (CP0) and an active LOW clock input (CP1), buffered outputs from all four bit positions (O0 to O3) and an active HIGH overriding asynchronous master reset input (MR). The counter advances on either the LOW to HIGH transition of the CP0 input if CP1 is HIGH or the HIGH to

					Fig.1 Functional diagram.
PINNING
	CP0A, CP0B				clock inputs (L to H triggered)
				1B	clock inputs (H to L triggered)
	CP	1A,	CP
	MRA, MRB				master reset inputs
	O0A to O3A				outputs
	O0B to O3B				outputs

LOW transition of the CP1 input if CP0 is LOW. Either CP0

or CP1 may be used as the clock input to the counter and the other clock input may be used as a clock enable input. A HIGH on MR resets the counter (O0 to O3 = LOW)

independent of CP0, CP1.

Schmitt-trigger action in the clock input makes the circuit highly tolerant to slower clock rise and fall times.

Fig.2 Pinning diagram.

HEF4518BP(N): 16-lead DIL; plastic (SOT38-1)

HEF4518BD(F): 16-lead DIL; ceramic (cerdip) (SOT74)

HEF4518BT(D): 16-lead SO; plastic (SOT109-1)

( ): Package Designator North America

APPLICATION INFORMATION

Some examples of applications for the HEF4518B are:

∙Multistage synchronous counting.

∙Multistage asynchronous counting.

∙Frequency dividers.

FAMILY DATA, IDD LIMITS category MSI

See Family Specifications

January 1995

2

_

1995 January

Fig.3 Logic diagram (one counter).

3	FUNCTION TABLE
	CP0			1		MR	MODE
			CP
			H			L	counter advances
	L					L	counter advances
			X			L	no change
	X					L	no change
			L			L	no change
	H					L	no change
	X		X			H	O0 to O3 = LOW
	Notes

1.H = HIGH state (the more positive voltage) L = LOW state (the less positive voltage) X = state is immaterial

= positive-going transition

= negative-going transition

counter BCD Dual

HEF4518B MSI

Semiconductors Philips

specification Product