Philips HEF4585BU, HEF4585BT, HEF4585BPB, HEF4585BP, HEF4585BDB 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

HEF4585B MSI

4-bit magnitude comparator

Product specification			January 1995
File under Integrated Circuits, IC04

Philips Semiconductors	Product specification

4-bit magnitude comparator

HEF4585B

MSI

DESCRIPTION

The HEF4585B is a 4-bit magnitude comparator which compares two 4-bit words (A and B), whether they are ‘less than’, ‘equal to’, or ‘greater than’. Each word has four parallel inputs (A0 to A3 and B0 to B3); A3 and B3 being the most significant inputs. Three outputs are provided;

A greater than B (OA > B), A less than B (OA < B) and A equal to B (OA = B). Three expander inputs (IA > B,

IA < B and IA = B) allow cascading of the devices without external gates.

Fig.1 Functional diagram.

For proper compare operation the expander inputs to the least significant position must be connected as follows: IA = B = IA > B = HIGH, IA < B = LOW. For words greater than 4-bits, units can be cascaded by connecting outputs

OA < B and OA = B to the corresponding inputs of the next significant comparator (input IA > B is connected to a HIGH).

Operation is not restricted to binary codes, the devices will work with any monotonic code. The function table describes the operation of the device under all possible logic conditions.

Fig.2 Pinning diagram.

HEF4585BP(N): 16-lead DIL; plastic (SOT38-1)

HEF4585BD(F): 16-lead DIL; ceramic (cerdip) (SOT74)

HEF4585BT(D): 16-lead SO; plastic (SOT109-1)

( ): Package Designator North America

PINNING
A0 to A3	word A parallel inputs
B0 to B3	word B parallel inputs
IA > B, IA < B, IA = B	expander inputs
OA > B	A greater than B output
OA < B	A less than B output
OA = B	A equal to B output

FAMILY DATA, IDD LIMITS category MSI

See Family Specifications

January 1995

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