54AC11521, 74AC11521
8-BIT IDENTITY COMPARATORS
SCAS022A D2957, JULY 1987 REVISED APRIL 1993
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Copyright
1993, Texas Instruments Incorporated
21
Compares Two 8-Bit Words
Flow-Through Architecture Optimizes
PCB Layout
Center-Pin V
CC
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 Small-
Outline Packages, Plastic Shrink
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. Also included
is a P = Q totem-pole output.
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.
FUNCTION TABLE
INPUTS
OUTPUT
DATA
P, Q
ENABLE
G
OUTPUT
P = Q
P = Q
L
L
P > Q
L
H
P < Q
L
H
X
H
H
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Q1
P1
Q0
P0
GND
P = Q
G7
P7
Q6
P6
G
P2
Q2
P3
Q3
V
CC
P4
Q4
P5
Q5
54AC11521 . . . J PACKAGE
74AC11521 . . . DB, DW OR N PACKAGE
(TOP VIEW)
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
Q4
P5
Q5
P6
Q6
P2
G
Q1
P1
Q0
54AC11521 . . . FK PACKAGE
(TOP VIEW)
Q2
P3
Q3
P7
P4
P0
GND
P
= Q
CC
V
Q7
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
P7
P6
P5
P4
P3
P2
P1
P0
COMP
P = Q
6
1P = Q
7
0
7
0
7
9
11
13
16
18
1
3
8
10
12
14
17
19
2
4
20
G
P
Q
G1
logic symbol
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.
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.
EPIC is a trademark of Texas Instruments Incorporated.
54AC11521, 74AC11521
8-BIT IDENTITY COMPARATORS
SCAS022A D2957, JULY 1987 REVISED APRIL 1993
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
22
logic diagram (positive logic)
G
Q0
P0
Q1
P1
Q2
P2
Q3
P3
P4
Q5
P5
Q6
P6
Q7
P7
20
3
4
1
2
18
19
16
17
13
14
11
12
9
10
7
8
P = Q
6
Q4
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, V
CC
0.5 V to 6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
(see Note 1)
0.5 V to V
CC
+ 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, V
O
(see Note 1)
0.5 V to V
CC
+ 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0 or V
I
> V
CC
)
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0 or V
O
> V
CC
)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, I
O
(V
O
= 0 to V
CC
)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through V
CC
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.
54AC11521, 74AC11521
8-BIT IDENTITY COMPARATORS
SCAS022A D2957, JULY 1987 REVISED APRIL 1993
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
23
recommended operating conditions
54AC11521
74AC11521
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
3
5
5.5
3
5
5.5
V
VCC = 3 V
2.1
2.1
VIH
High-level input voltage
VCC = 4.5 V
3.15
3.15
V
VCC = 5.5 V
3.85
3.85
VCC = 3 V
0.9
0.9
VIL
Low-level input voltage
VCC = 4.5 V
1.35
1.35
V
VCC = 5.5 V
1.65
1.65
VI
Input voltage
0
VCC
0
VCC
V
VO
Output voltage
0
VCC
0
VCC
V
VCC = 3 V
4
4
IOH
High-level output current
VCC = 4.5 V
24
24
mA
VCC = 5.5 V
24
24
VCC = 3 V
12
12
IOL
Low-level output current
VCC = 4.5 V
24
24
mA
VCC = 5.5 V
24
24
D
t /
D
v
Input transition rise or fall rate
0
10
0
10
ns / V
TA
Operating free-air temperature
55
125
40
85
C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25
C
54AC11521
74AC11521
UNIT
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
3 V
2.9
2.9
2.9
IOH = 50
m
A
4.5 V
4.4
4.4
4.4
5.5 V
5.4
5.4
5.4
V
IOH = 4 mA
3 V
2.58
2.4
2.48
V
VOH
IOH = 24 mA
4.5 V
3.94
3.7
3.8
V
IOH = 24 mA
5.5 V
4.94
4.7
4.8
IOH = 50 mA
{
5.5 V
3.85
IOH = 75 mA
{
5.5 V
3.85
3 V
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
V
IOL = 12 mA
3 V
0.36
0.5
0.44
V
VOL
IOL = 24 mA
4.5 V
0.36
0.5
0.44
V
IOL = 24 mA
5.5 V
0.36
0.5
0.44
IOL = 50 mA
{
5.5 V
1.65
IOL = 75 mA
{
5.5 V
1.65
II
VI = VCC or GND
5.5 V
0.1
1
1
m
A
ICC
VI = VCC or GND, IO = 0
5.5 V
8
160
80
m
A
Ci
VI = VCC or GND
5 V
4
pF
Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms.
54AC11521, 74AC11521
8-BIT IDENTITY COMPARATORS
SCAS022A D2957, JULY 1987 REVISED APRIL 1993
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
24
switching characteristics over recommended operating free-air temperature range,
V
CC
= 3.3 V
0.3 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
TA = 25
C
54AC11521
74AC11521
UNIT
PARAMETER
(INPUT)
(OUTPUT)
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
tPLH
P or Q
P
Q
1.5
12.5
16.6
1.5
20.4
1.5
19
ns
tPHL
P or Q
P = Q
1.5
10.5
14.1
1.5
17.4
1.5
16.1
ns
tPLH
G
P
Q
1.5
7.1
9.8
1.5
11.4
1.5
10.8
ns
tPHL
G
P = Q
1.5
6.4
8.8
1.5
10.8
1.5
10.1
ns
switching characteristics over recommended operating free-air temperature range,
V
CC
= 5 V
0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
TA = 25
C
54AC11521
74AC11521
UNIT
PARAMETER
(INPUT)
(OUTPUT)
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
tPLH
P or Q
P
Q
1.5
8.3
11.3
1.5
14
1.5
13
ns
tPHL
P or Q
P = Q
1.5
7.2
10.1
1.5
12.2
1.5
11.4
ns
tPLH
G
P
Q
1.5
5.1
7.1
1.5
8.4
1.5
7.9
ns
tPHL
G
P = Q
1.5
4.8
7.1
1.5
8.6
1.5
8.1
ns
operating characteristics, V
CC
= 5 V, T
A
= 25
C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd Power dissipation capacitance
CL = 50 pF, f = 1 MHz
42
pF
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORMS
LOAD CIRCUIT
Input
(see Note B)
50%
50%
50% VCC
50% VCC
tPHL
tPLH
VCC
Output
VOL
VOH
0 V
From Output
Under Test
CL = 50 pF
(see Note A)
500
NOTES: A. CL includes probe and jig capacitance.
B. Input pulses are supplied by generators having the following characteristics: PRR
10 MHz, ZO = 50
, 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
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1998, Texas Instruments Incorporated
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