MM74HC688WMX Просмотр технического описания (PDF) - Fairchild Semiconductor
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MM74HC688WMX Datasheet PDF : 7 Pages
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September 1983
Revised May 2005
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’s 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 VCC and
ground.
Features
s Typical propagation delay: 20 ns
s Wide power supply range: 2–6V
s Low quiescent current: 80 PA (74 Series)
s Large output current: 4 mA (74 Series)
s Same as HC521
Ordering Code:
Order Number Package Number
Package Description
MM74HC688WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
MM74HC688SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC688MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MM74HC688N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Logic Diagram
Pin Assignments for DIP
Truth Table
Top View
Inputs
Data
Enable
P,Q
G
PQ
L
P!Q
L
P Q
L
X
H
PQ
L
H
H
H
© 2005 Fairchild Semiconductor Corporation DS005018
www.fairchildsemi.com
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