74HC688D,653 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
Manufacturer
74HC688D,653 Datasheet PDF : 7 Pages
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Philips Semiconductors
8-bit magnitude comparator
Product specification
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 provides P = Q.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
SYMBOL PARAMETER
CONDITIONS
tPHL/ tPLH
CI
CPD
propagation delay
Pn, Qn to P = Q
E to P = Q
input capacitance
power dissipation capacitance per package
CL = 15 pF; VCC = 5 V
notes 1 and 2
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo)
where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (CL × VCC2 × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC − 1.5 V
TYPICAL
HC
HCT
17
17
8
12
3.5
3.5
30
30
ORDERING INFORMATION
See “74HC/HCT/HCU/HCMOS Logic Package Information”.
UNIT
ns
ns
pF
pF
December 1990
2
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