SN54ALS520_16 Datasheet, PDF (1/21 Pages) Texas Instruments – 8-BIT IDENTITY COMPARATORS

SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521
8-BIT IDENTITY COMPARATORS
• Compare Two 8-Bit Words
• Choice of Totem-Pole or Open-Collector
Outputs
• SN74ALS518 and ′ALS520 Have 20-kΩ
Pullup Resistors on Q Inputs
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
TYPE
INPUT
PULLUP
RESISTOR
OUTPUT FUNCTION
AND
CONFIGURATION
SN74ALS518
Yes
P = Q open collector
′ALS520
Yes
P = Q totem pole
SN74ALS521‡
No
P = Q totem pole
‡ _{SN74ALS521 is identical to ′ALS688.}
description
These identity comparators perform comparisons
on two 8-bit binary or BCD words. The
SN74ALS518 provides P = Q outputs, while the
′ALS520 and SN74ALS521 provide P = Q
outputs. The SN74ALS518 has an open-collector
output. The SN74ALS518 and ′ALS520 feature
20-kΩ pullup resistors on the Q inputs for analog
or switch data.
The SN54ALS520 is characterized for operation
over the full military temperature range of – 55°C
to 125°C. The SN74ALS518, SN74ALS520, and
SN74ALS521 are characterized for operation
from 0°C to 70°C.
SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995
SN54ALS520 . . . J PACKAGE
SN74ALS518, SN74ALS520,
SN74ALS521 . . . DW OR N PACKAGE
(TOP VIEW)
G₁
P0 ₂
Q0 3
P1 4
Q1 5
P2 6
Q2 7
P3 8
Q3 9
GND 10
20 ^V_CC
19 ^{P = Q / P = Qâ€} 
18 Q7
17 P7
16 Q6
15 P6
14 Q5
13 P5
12 Q4
11 P4
† _{P = Q for SN74ALS518}
P = Q for ′ALS520 and SN74ALS521
SN54ALS520 . . . FK PACKAGE
(TOP VIEW)
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
FUNCTION TABLE
INPUTS
OUTPUTS
DATA
P, Q
ENABLE
G
P=Q
P=Q
P=Q
L
H
L
P>Q
L
L
H
P<Q
L
L
H
X
H
L
H
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.
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Copyright © 1995, Texas Instruments Incorporated
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