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54AC11521, 74AC11521
8-BIT IDENTITY COMPARATORS
SCAS022A – D2957, JULY 1987 – REVISED APRIL 1993
•
•
•
•
•
•
Compares Two 8-Bit Words
Flow-Through Architecture Optimizes
PCB Layout
Center-Pin VCC and GND Configurations
Minimize High-Speed Switching Noise
EPIC t (Enhanced-Performance Implanted
CMOS) 1-m m Process
500-mA Typical Latch-Up Immunity at 125°C
Package Options Include Plastic SmallOutline Packages, Plastic Shrink
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
54AC11521 . . . J PACKAGE
74AC11521 . . . DB, DW OR N PACKAGE
(TOP VIEW)
Q1
P1
Q0
P0
GND
P=Q
G7
P7
Q6
P6
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
G
P2
Q2
P3
Q3
VCC
P4
Q4
P5
Q5
54AC11521 . . . FK PACKAGE
(TOP VIEW)
Q2
P3
Q3
V CC
P4
description
These identity comparators perform comparisons
on two 8-bit binary or BCD words. Also included
is a P = Q totem-pole output.
P2
G
Q1
P1
Q0
The 54AC11521 is characterized for operation
over the full military temperature range of – 55°C
to 125°C. The 74AC11521 is characterized for
operation from – 40°C to 85°C.
INPUTS
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
Q4
P5
Q5
P6
Q6
P0
GND
P=Q
Q7
P7
FUNCTION TABLE
4
OUTPUT
P=Q
DATA
P, Q
ENABLE
G
P=Q
L
L
P>Q
L
H
P<Q
L
H
G
X
H
H
P0
P1
P2
P3
P4
P5
P6
P7
logic symbol†
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
20
4
2
19
17
14
12
10
8
3
1
18
16
13
11
9
7
G1
COMP
0
P
7
1P = Q
6
P=Q
0
Q
7
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
Pins numbers shown are for the DW, J, and N packages.
EPIC is a trademark of Texas Instruments Incorporated.
Copyright 1993, Texas Instruments Incorporated
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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54AC11521, 74AC11521
8-BIT IDENTITY COMPARATORS
SCAS022A – D2957, JULY 1987 – REVISED APRIL 1993
logic diagram (positive logic)
P7
Q7
P6
Q6
P5
Q5
P4
Q4
P3
Q3
P2
Q2
P1
Q1
P0
Q0
G
8
7
10
9
12
11
14
13
17
6
16
P=Q
19
18
2
1
4
3
20
Pin numbers shown are for the DW, J, and N packages.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 6 V
Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC + 0.5 V
Output voltage range, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC + 0.5 V
Input clamp current, IIK (VI < 0 or VI > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 50 mA
Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 50 mA
Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 100 mA
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2–2
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54AC11521, 74AC11521
8-BIT IDENTITY COMPARATORS
SCAS022A – D2957, JULY 1987 – REVISED APRIL 1993
recommended operating conditions
54AC11521
VCC
Supply voltage
VIH
VCC = 3 V
VCC = 4.5 V
High-level input voltage
VCC = 5.5 V
VCC = 3 V
VIL
Low-level input voltage
VI
VO
MAX
3
5
5.5
Input transition rise or fall rate
TA
Operating free-air temperature
3
5
5.5
3.15
UNIT
V
V
3.85
0.9
0.9
1.35
1.35
1.65
1.65
VCC
VCC
0
D t /D v
MAX
3.15
VCC = 3 V
VCC = 4.5 V
Low-level output current
NOM
2.1
0
High-level output current
MIN
2.1
VCC = 4.5 V
VCC = 5.5 V
Output voltage
IOL
NOM
3.85
Input voltage
IOH
74AC11521
MIN
0
VCC
VCC
0
–4
–4
– 24
– 24
VCC = 5.5 V
VCC = 3 V
– 24
– 24
12
12
VCC = 4.5 V
VCC = 5.5 V
24
24
24
24
V
V
V
mA
mA
0
10
0
10
ns / V
– 55
125
– 40
85
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
IOH = – 50 m A
VOH
IOH = – 4 mA
IOH = – 24 mA
Ci
TA = 25°C
TYP
MAX
54AC11521
MIN
MAX
74AC11521
MIN
3V
2.9
2.9
2.9
4.5 V
4.4
4.4
4.4
5.5 V
5.4
5.4
5.4
3V
2.58
2.4
2.48
4.5 V
3.94
3.7
3.8
5.5 V
4.94
4.7
4.8
MAX
5.5 V
5.5 V
3V
0.1
0.1
0.1
IOL = 50 m A
4.5 V
0.1
0.1
0.1
5.5 V
0.1
0.1
0.1
3V
0.36
0.5
0.44
4.5 V
0.36
0.5
0.44
5.5 V
0.36
0.5
0.44
IOL = 12 mA
IOL = 50 mA{
5.5 V
IOL = 75 mA{
VI = VCC or GND
5.5 V
VI = VCC or GND,
VI = VCC or GND
3.85
3.85
1.65
± 0.1
±1
±1
mA
8
160
80
mA
5.5 V
5V
V
1.65
5.5 V
IO = 0
UNIT
V
IOH = – 75 mA{
IOL = 24 mA
II
ICC
MIN
= – 50 mA{
IOH
VOL
VCC
4
pF
† Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms.
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54AC11521, 74AC11521
8-BIT IDENTITY COMPARATORS
SCAS022A – D2957, JULY 1987 – REVISED APRIL 1993
switching characteristics over recommended operating free-air temperature range,
VCC = 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
P or Q
P=Q
tPLH
tPHL
G
P=Q
MIN
TA = 25°C
TYP
MAX
54AC11521
74AC11521
MIN
MAX
MIN
MAX
1.5
12.5
16.6
1.5
20.4
1.5
19
1.5
10.5
14.1
1.5
17.4
1.5
16.1
1.5
7.1
9.8
1.5
11.4
1.5
10.8
1.5
6.4
8.8
1.5
10.8
1.5
10.1
UNIT
ns
ns
switching characteristics over recommended operating free-air temperature range,
VCC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
P or Q
P=Q
tPLH
tPHL
G
P=Q
MIN
TA = 25°C
TYP
MAX
54AC11521
74AC11521
MIN
MAX
MIN
MAX
1.5
8.3
11.3
1.5
14
1.5
13
1.5
7.2
10.1
1.5
12.2
1.5
11.4
1.5
5.1
7.1
1.5
8.4
1.5
7.9
1.5
4.8
7.1
1.5
8.6
1.5
8.1
UNIT
ns
ns
operating characteristics, VCC = 5 V, TA = 25°C
PARAMETER
Cpd
TEST CONDITIONS
Power dissipation capacitance
CL = 50 pF,
f = 1 MHz
TYP
UNIT
42
pF
PARAMETER MEASUREMENT INFORMATION
VCC
Input
(see Note B)
From Output
Under Test
CL = 50 pF
(see Note A)
50%
50%
0V
tPHL
500 Ω
tPLH
50% VCC
Output
VOH
50% VCC
VOL
VOLTAGE WAVEFORMS
LOAD CIRCUIT
NOTES: A. CL includes probe and jig capacitance.
B. Input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr = 3 ns, tf = 3 ns.
C. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
2–4
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