Texas Instruments SN54ALS688J, SN74ALS688DW, SN74ALS688DWR, SN74ALS688N, SN74ALS688N3 Datasheet
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SN54ALS688, SN74ALS688
OUTPUT
8-BIT IDENTITY COMPARATORS
SDAS228A – JUNE 1982 – REVISED JANUARY 1995
• Compare Two 8-Bit Words
• Totem-Pole Outputs (P = Q)
• ′ALS688 Are Identical to ′ALS521
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
description
These identity comparators perform comparisons
on two 8-bit binary or BCD words and provide
P = Q
outputs. These devices have totem-pole
outputs.
The SN54ALS688 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74ALS688 is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
DATA
ENABLE
P, Q
P = Q L L
P > Q LH
P < Q LH
XHH
G
P = Q
SN54ALS688 ...J PACKAGE
SN74ALS688 ...DW OR N PACKAGE
SN54ALS688 . . . FK PACKAGE
P1
Q1
P2
Q2
P3
(TOP VIEW)
G
1
P0
2
Q0
3
P1
4
Q1
5
P2
6
Q2
7
P3
8
9
Q3
GND
10
(TOP VIEW)
Q0P0G
3212019
4
5
6
7
8
910111213
Q3
P4
20
19
18
17
16
15
14
13
12
11
V
CC
Q4
V
CC
P = Q
Q7
P7
Q6
P6
Q5
P5
Q4
P4
18
17
16
15
14
P5 P = Q
Q7
P7
Q6
P6
Q5
GND
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 1995, Texas Instruments Incorporated
1
SN54ALS688, SN74ALS688
8-BIT IDENTITY COMPARATORS
SDAS228A – JUNE 1982 – REVISED JANUAR Y 1995
logic symbol
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
†
G1
0
7
0
7
COMP
P
1P=Q
Q
P0
P1
P2
P3
P4
P5
P6
P7
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
1
G
2
4
6
8
11
13
15
17
3
5
7
9
12
14
16
18
19
P = Q
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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