TL F 10199
93L24
5-Bit
Comparator
June 1989
93L24
5-Bit Comparator
General Description
The 93L24 expandable comparator provides comparison
between two 5-bit words and gives three outputs
``less
than'' ``greater than'' and ``equal to'' A HIGH on the active
LOW Enable Input forces all three outputs LOW
Features
Y
Three separate outputs A
k
B A
l
B A
e
B
Y
Easily expandable
Y
Active low enable input
Connection Diagram
Dual-In-Line Package
TL F 10199 1
Order Number 93L24DMQB or 93L24FMQB
See NS Package Number J16A or W16A
Logic Symbol
TL F 10199 2
V
CC
e
Pin 16
GND
e
Pin 8
Pin Names
Description
E
Enable Input (Active LOW)
A0 A4
Word A Parallel Inputs
B0 B4
Word B Parallel Inputs
A
k
B
A Less than B Output (Active HIGH)
A
l
B
A Greater than B Output (Active HIGH)
A
e
B
A Equal to B Output (Active HIGH)
Truth Table
Inputs
Outputs
E
An
Bn
A
k
B
A
l
B
A
e
B
H
X
X
L
L
L
L
Word A
e
Word B
L
L
H
L
Word A
l
Word B
L
H
L
L
Word B
k
Word A
H
L
L
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
C1995 National Semiconductor Corporation
RRD-B30M105 Printed in U S A
Absolute Maximum Ratings
(Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
5 5V
Operating Free Air Temperature Range
MIL
b
55 C to
a
125 C
Storage Temperature Range
b
65 C to
a
150 C
Note
The ``Absolute Maximum Ratings'' are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ``Electrical Characteristics''
table are not guaranteed at the absolute maximum ratings
The ``Recommended Operating Conditions'' table will define
the conditions for actual device operation
Recommended Operating Conditions
Symbol
Parameter
93L24 (MIL)
Units
Min
Nom
Max
V
CC
Supply Voltage
4 5
5
5 5
V
V
IH
High Level Input Voltage
2
V
V
IL
Low Level Input Voltage
0 7
V
I
OH
High Level Output Current
b
400
m
A
I
OL
Low Level Output Current
4 8
mA
T
A
Free Air Operating Temperature
b
55
125
C
Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 1)
V
I
Input Clamp Voltage
V
CC
e
Min I
I
e b
10 mA
b
1 5
V
V
OH
High Level Output Voltage
V
CC
e
Min I
OH
e
Max
2 4
V
V
IL
e
Max V
IH
e
Min
V
OL
Low Level Output Voltage
V
CC
e
Min I
OL
e
Max
0 3
V
V
IH
e
Min V
IL
e
Max
I
I
Input Current
Max
V
CC
e
Max V
I
e
5 5V
1
mA
Input Voltage
I
IH
High Level Input Current
V
CC
e
Max V
I
e
2 4V
40
m
A
I
IL
Low Level Input Current
V
CC
e
Max V
I
e
0 3V
b
0 8
mA
I
OS
Short Circuit
V
CC
e
Max (Note 2)
b
2 5
b
25
mA
Output Current
I
CC
Supply Current
V
CC
e
Max
21
mA
Note 1
All typicals are at V
CC
e
5V T
A
e
25 C
Note 2
Not more than one output should be shorted at a time and the duration should not exceed one second
2
Switching Characteristics
V
CC
e a
5 0V T
A
e a
25 C (See Section 1 for test waveforms and output load)
Symbol
Parameter
C
L
e
15 pF
Units
Min
Max
t
PLH
Propagation Delay
32
ns
t
PHL
E to A
e
B E to A
k
B A
l
B
35
t
PLH
Propagation Delay
54
ns
t
PHL
An to A
l
B Bn to A
l
B
75
t
PLH
Propagation Delay
70
ns
t
PHL
An to A
k
B Bn to A
k
B
77
t
PLH
Propagation Delay
100
ns
t
PHL
An or Bn to A
e
B
102
Functional Description
The 93L24 5-bit comparators use combinational circuitry to
directly generate ``A greater than B'' and ``A less than B''
outputs As evident from the logic diagram these ouptuts
are generated in only three gate delays The ``A equals B''
output is generated in one additional gate delay by decoding
the ``A neither less than nor greater than B'' condition with a
NOR gate All three outputs are activated by the active LOW
Enable Input (E)
Tying the A
l
B output from one device into an A input on
another device and the A
k
B output into the corresponding
B input permits easy expansion
The A4 and B4 inputs are the most significant inputs and
A0 B0 the least significant Thus if A4 is HIGH and B4 is
LOW the A
l
B output will be HIGH regardless of all other
inputs except E
Logic Diagram
TL F 10199 3
3
93L24
5-Bit
Comparator
Physical Dimensions
inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 93L24DMQB
NS Package Number J16A
16-Lead Ceramic Flat Package (W)
Order Number 93L24FMQB
NS Package Number W16A
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SEMICONDUCTOR CORPORATION As used herein
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support device or system whose failure to perform can
into the body or (b) support or sustain life and whose
be reasonably expected to cause the failure of the life
failure to perform when properly used in accordance
support device or system or to affect its safety or
with instructions for use provided in the labeling can
effectiveness
be reasonably expected to result in a significant injury
to the user
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