8-Bit Identity Comparators
• Compares Two 8-Bit Words • Package Options Include Plastic
Small-Outline Packages, Ceramic Chip Carriers, and Standard...
Description
Compares Two 8-Bit Words Package Options Include Plastic
Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs
description
These identity comparators perform comparisons on two 8-bit binary or BCD words. They provide P = Q outputs.
The SN54F521 is characterized for operation over the full military temperature range of − 55°C to 125°C. The SN74F521 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS P, Q OE
OUTPUT P=Q
P=Q L
L
P≠Q X
H
X
H
H
logic symbol†
1
OE 2
P0 4
P1 6
P2 8
P3 11
P4 13
P5 15
P6 17
P7 3
Q0 5
Q1 7
Q2 9
Q3 12
Q4 14
Q5 16
Q6 18
Q7
COMP 0
P
7 1P = Q
0
Q
7
19 P=Q
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Q3 GND
P4 Q4 P5
SN54F521, SN74F521 8ĆBIT IDENTITY COMPARATORS
ą
SDFS091 − MARCH 1987 − REVISED OCTOBER 1993
SN54F521 . . . J PACKAGE SN74F521 . . . DW OR N PACKAGE
(TOP VIEW)
OE 1 P0 2 Q0 3 P1 4 Q1 5 P2 6 Q2 7 P3 8 Q3 9 GND 10
20 VCC 19 P = Q 18 Q7 17 P7 16 Q6 15 P6 14 Q5 13 P5 12 Q4 11 P4
SN54F521 . . . FK PACKAGE (TOP VIEW)
Q0 P0 OE VCC P=Q
P1
3 2 1 20 19
4
18
Q7
Q1 5
17 P7
P2 6
16 Q6
Q2 7
15 P6
P3 8
14 Q5
9 10 11 12 13
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.
Copyright 1993, Texas Instruments Incorporated
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