Texas Instruments SN54HC688J, SN74HC688DW, SN74HC688DWR, SN74HC688N, SN74HC688PWLE Datasheet
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OUTPUT
SN54HC688, SN74HC688
8-BIT IDENTITY COMPARATORS
SCLS010B – DECEMBER 1982 – REVISED MA Y 1997
D
Compare Two 8-Bit Words
D
Package Options Include Plastic
Small-Outline (DW) and Ceramic Flat (W)
Packages, Ceramic Chip Carriers (FK), and
Standard Plastic (N) and Ceramic (J)
300-mil DIPs
description
These identity comparators perform comparisons
of two 8-bit binary or BCD words. An
output-enable (OE) input may be used to force the
output to the high level.
The SN54HC688 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74HC688 is characterized for
operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS
DATA
P, Q
P = Q L L
P > Q XH
P < Q XH
X H H
OE
P = Q
SN54HC688 ...J OR W PACKAGE
SN74HC688 . . . DW OR N PACKAGE
SN54HC688 . . . FK PACKAGE
P1
Q1
P2
Q2
P3
(TOP VIEW)
OE
1
P0
2
Q0
3
P1
4
Q1
5
P2
6
Q2
7
P3
8
Q3
9
GND
10
(TOP VIEW)
Q0
3212019
4
5
6
7
8
910111213
Q3
P0
20
19
18
17
16
15
14
13
12
11
OE
VCCP = Q
P4
Q4
V
CC
P = Q
Q7
P7
Q6
P6
Q5
P5
Q4
P4
18
17
16
15
14
P5
Q7
P7
Q6
P6
Q5
GND
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1997, Texas Instruments Incorporated
1
SN54HC688, SN74HC688
8-BIT IDENTITY COMPARATORS
SCLS010B – DECEMBER 1982 – REVISED MA Y 1997
logic symbol
†
OE
P0
P1
P2
P3
P4
P5
P6
P7
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
1
2
4
6
8
11
13
15
17
3
5
7
9
12
14
16
18
EN
0
7
0
7
COMP
P
Q
P = Q
19
P = Q
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
1
OE
2
P0
3
Q0
4
P1
5
Q1
6
P2
7
Q2
8
P3
9
Q3
11
P4
12
Q4
13
P5
14
Q5
15
P6
16
Q6
17
P7
18
Q7
19
P = Q
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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