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74HC688N-74HC688PW-74HCT688DB-74HCT688N
74HC/HCT688; 8-bit magnitude comparator

Philips Semiconductors Product specification
8-bit magnitude comparator 74HC/HCT688
FEATURES
Compare two 8-bit words Output capability: standard ICC category: MSI
GENERAL DESCRIPTION

The 74HC/HCT688 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT688 are 8-bit magnitude comparators.
They perform comparison of two 8-bit binary or BCD
words.
The output providesP=Q.
QUICK REFERENCE DATA

GND= 0 V; Tamb =25 °C; tr =tf= 6 ns
Notes
CPD is used to determine the dynamic power dissipation (PD in μW): =CPD × VCC2 × fi + ∑ (CL × VCC2 ×fo) where:= input frequency in MHz= output frequency in MHz
∑ (CL × VCC2 × fo)= sum of outputs= output load capacitance in pF
VCC= supply voltage in V For HC the condition is VI= GND to VCC
For HCT the condition is VI= GND to VCC − 1.5 V
ORDERING INFORMATION

See “74HC/HCT/HCU/HCMOS Logic Package Information”.
Philips Semiconductors Product specification
8-bit magnitude comparator 74HC/HCT688
PIN DESCRIPTION
Philips Semiconductors Product specification
8-bit magnitude comparator 74HC/HCT688
FUNCTION TABLE
Notes
H= HIGH voltage level= LOW voltage level= don’t care
Philips Semiconductors Product specification
8-bit magnitude comparator 74HC/HCT688
DC CHARACTERISTICS FOR 74HC

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
AC CHARACTERISTICS FOR 74HC

GND= 0 V; tr =tf= 6 ns; CL= 50 pF
Philips Semiconductors Product specification
8-bit magnitude comparator 74HC/HCT688
DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
Note to HCT types

The value of additional quiescent supply current (ΔICC) for a unit load of 1 is given in the family specifications.
To determine ΔICC per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT

GND= 0 V; tr =tf= 6 ns; CL= 50 pF
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