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74HC688D,653

8-bit magnitude comparator

NXP Semiconductors. 

Philips Semiconductors

8-bit magnitude comparator

AC WAVEFORMS

Product specification

74HC/HCT688

(1) HC : VM = 50%; VI = GND to VCC.

HCT: VM = 1.3 V; VI = GND to 3 V.

Fig.6 Waveforms showing the enable input (E) to

the equal to output (P = Q) propagation

delays and the output transition times.

(1) HC : VM = 50%; VI = GND to VCC.

HCT: VM = 1.3 V; VI = GND to 3 V.

Fig.7 Waveforms showing the word inputs (Pn, Qn)

to the equal to output (P = Q) propagation

delays and the output transition times.

APPLICATION INFORMATION

Two or more “688” 8-bit magnitude comparators may be cascaded to compare binary or BCD numbers of more than 8

bits. An example is shown in Fig.8.

Fig.8 Binary or BCD comparator.

PACKAGE OUTLINES

See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.

December 1990

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