74HC688PW datasheet(7/7 Pages) PHILIPS

7 / 7 page

December 1990

7

Philips Semiconductors

Product speciﬁcation

8-bit magnitude comparator

74HC/HCT688

AC WAVEFORMS

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.

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

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

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.

PACKAGE OUTLINES

See

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

Fig.8 Binary or BCD comparator.

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