54ACT11521, 74ACT11521
8 BIT IDENTITY COMPARATORS
SCAS023A − D2957, JULY 1978 − REVISED APRIL 1993
•
•
•
•
•
•
•
Compares Two 8-Bit Words
Inputs Are TTL-Voltage Compatible
Flow-Through Architecture Optimizes
PCB Layout
Center-Pin V
CC
and GND Configurations
Minimize High-Speed Switching Noise
EPICt
(Enhanced-Performance Implanted
CMOS) 1-mm 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
54ACT11521 . . . J PACKAGE
74ACT11521 . . . DB, DW OR N PACKAGE
(TOP VIEW)
Q1
P1
Q0
P0
GND
P=Q
G7
P7
Q6
P6
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
G
P2
Q2
P3
G3
V
CC
P4
Q4
P5
Q5
54ACT11521 . . . FK PACKAGE
(TOP VIEW)
These identity comparators perform comparisons
on two 8-bit binary or BCD words. Also included
is a P = Q totem-pole output.
The 54ACT11521 is characterized for operation
over the full military temperature range of − 55°C
to 125°C. The 74ACT11521 is characterized for
operation from − 40°C to 85°C.
FUNCTION TABLE
INPUTS
DATA
P, Q
P=Q
P>Q
P<Q
X
ENABLE
G
L
L
L
H
OUTPUT
P=Q
L
H
H
H
P2
G
Q1
P1
Q0
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
Q2
P3
Q3
VCC
P4
Q4
P5
Q5
P6
Q6
Copyright
1993, Texas Instruments Incorporated
description
EPIC is a trademark of 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.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
•
P0
GND
P=Q
Q7
P7
2−1
54ACT11521, 74ACT11521
8 BIT IDENTITY COMPARATORS
SCAS023A − D2957, JULY 1978 − REVISED APRIL 1993
logic symbol
†
G
P0
P1
P2
P3
P4
P5
P6
P7
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
7
Q
7
1P = Q
0
6
P
G1
0
COMP
logic diagram (positive logic)
P7
Q7
P6
Q6
P5
P=Q
Q5
P4
Q4
P3
Q3
P2
Q2
P1
Q1
P0
Q0
G
8
7
10
9
12
11
14
13
17
6
16
19
18
2
1
4
3
20
P=Q
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
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.
2−2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
•
54ACT11521, 74ACT11521
8 BIT IDENTITY COMPARATORS
SCAS023A − D2957, JULY 1978 − REVISED APRIL 1993
recommended operating conditions
54ACT11521
MIN
VCC
VIH
VIL
VI
VO
IOH
IOL
Dt
/Dv
TA
Supply voltage
High-level input voltage
Low-level input voltage
Input voltage
Output voltage
High-level output current
Low-level output current
Input transition rise or fall rate
Operating free-air temperature
0
−55
0
0
4.5
2
0.8
VCC
VCC
−24
24
10
125
0
−40
0
0
NOM
5
MAX
5.5
74ACT11521
MIN
4.5
2
0.8
VCC
VCC
−24
24
10
85
NOM
5
MAX
5.5
UNIT
V
V
V
V
V
mA
mA
ns/ V
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
IOH = − 50
mA
A
VOH
IOH = − 24 mA
IOH = − 50 mA
{
IOH = − 75 mA
{
IOL = 50
mA
A
VOL
IOL = 24 mA
IOL = 50 mA
{
IOL = 75 mA
{
II
ICC
DI
CC
}
Ci
VI = VCC or GND
VI = VCC or GND,
IO = 0
VCC
4.5 V
5.5 V
4.5 V
5.5 V
5.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
5.5 V
5.5 V
5.5 V
5.5 V
5.5 V
5V
4
±
0.1
8
0.9
±
1
160
1
0.1
0.1
0.36
0.36
0.1
0.1
0.5
0.5
1.65
1.65
±1
80
1
mA
mA
mA
pF
TA = 25°C
MIN
TYP
MAX
4.4
5.4
3.94
4.94
54ACT11521
MIN
4.4
5.4
3.7
4.7
3.85
3.85
0.1
0.1
0.44
0.44
V
MAX
74ACT11521
MIN
4.4
5.4
3.8
4.8
V
MAX
UNIT
One input at 3.4 V,
Other inputs at GND or VCC
VI = VCC or GND
† Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms.
‡ This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or VCC.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 1)
PARAMETER
tPLH
tPHL
tPLH
tPHL
FROM
(INPUT)
P or Q
G
TO
(OUTPUT)
P=Q
P=Q
TA = 25°C
MIN
TYP
MAX
1.5
1.5
1.5
1.5
8.8
8.2
6.7
6.8
13
12
9.3
8.8
54ACT11521
MIN
1.5
1.5
1.5
1.5
MAX
15.9
14.6
11.2
10.2
74ACT11521
MIN
1.5
1.5
1.5
1.5
MAX
14.7
13.6
10.5
9.7
ns
ns
UNIT
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
•
2−3
54ACT11521, 74ACT11521
8 BIT IDENTITY COMPARATORS
SCAS023A − D2957, JULY 1978 − REVISED APRIL 1993
operating characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER
Cpd
Power dissipation capacitance
TEST CONDITIONS
CL = 50 pF,
f = 1 MHz
TYP
40
UNIT
pF
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
CL = 50 pF
(see Note A)
500
Ω
Output
Input
(see Note B)
tPHL
3V
1.5 V
1.5 V
0V
tPLH
VOH
50% VCC
VOL
50% VCC
LOAD CIRCUIT
VOLTAGE WAVEFORMS
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
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
•
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