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MM74HC688 Datasheet

  • MM74HC688

  • 8-Bit Magnitude Comparator (Equality Detector)

  • 88.12KB

  • Fairchild

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MM74HC688 8-Bit Magnitude Comparator (Equality Detector)
September 1983
Revised February 1999
MM74HC688
8-Bit Magnitude Comparator (Equality Detector)
General Description
The MM74HC688 equality detector utilizes advanced sili-
con-gate CMOS technology to compare bit for bit two 8-bit
words and indicates whether or not they are equal. The
P=Q output indicates equality when it is LOW. A single
active low enable is provided to facilitate cascading of sev-
eral packages and enable comparison of words greater
than 8 bits.
This device is useful in memory block decoding applica-
tions, where memory block enable signals must be gener-
ated from computer address information.
The comparator鈥檚 output can drive 10 low power Schottky
equivalent loads. This comparator is functionally and pin
compatible to the 74LS688. All inputs are protected from
damage due to static discharge by diodes to V
CC
and
ground.
Features
s
Typical propagation delay: 20 ns
s
Wide power supply range: 2鈥?V
s
Low quiescent current: 80
碌A(chǔ)
(74 Series)
s
Large output current: 4 mA (74 Series)
s
Same as HC521
Ordering Code:
Order Number
MM74HC688WM
MM74HC688SJ
MM74HC688MTC
MM74HC688N
Package Number
M20B
M20D
MTC20
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300鈥?Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300鈥?Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter 鈥淴鈥?to the ordering code.
Connection Diagram
Pin Assignments for DIP
Logic Diagram
Top View
Truth Table
Inputs
Data
P,Q
P
=
Q
P
>
Q
P
<
Q
X
Enable
G
L
L
L
H
P
=
Q
L
H
H
H
漏 1999 Fairchild Semiconductor Corporation
DS005018.prf
www.fairchildsemi.com

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