MC54/74F85
4-BIT MAGNITUDE COMPARATOR
The MC54/74F85 is a 4-Bit Magnitude Comparator which compares two
4-Bitwords(A -A ,B -B ),A ,B beingthemostsignificantinputs. Operation
0
3
0
3
3
3
is not restricted to binary codes; the device will work with any monotonic code.
Three Outputs are provided: “A greater than B” (0 ), “A less than B” (0
>
A
B
A
< ),“AequaltoB”(0 = ). ThreeExpanderInputs,I > ,I < ,I = ,allow
A B A B A B A B
4-BIT MAGNITUDE COMPARATOR
FAST SCHOTTKY TTL
B
cascading without external gates. For proper compare operation, the Expan-
der Inputs to the least significant position must be connected as follows: I
<
A
=I > =L,I = =H. Forserial(ripple)expansionthe0 > ,0 < Outputs
B
A B A B A B A B
are connected respectively to the I > and I = inputs of the next most sig-
A
B
A B
nificant comparator, as shown in Figure 1. Refer to applications section of
data sheet for high speed method of comparing large words.
• High Impedance NPN Base Inputs for Reduced Loading (20 µA in
HIGH and LOW States)
• Magnitude Comparison of any Binary Words
• Serial or Parallel Expansion Without Extra Gating
J SUFFIX
CERAMIC
CASE 620-09
16
1
>
• ESD
4000 Volts
CONNECTION DIAGRAM
N SUFFIX
PLASTIC
V
A
B
A
A
B
A
B
0
CC
3
2
2
1
1
0
CASE 648-08
9
16
15
14
13
12
11
10
16
1
D SUFFIX
SOIC
CASE 751B-03
16
1
1
2
3
4
5
6
7
A<B GND
8
B
I
<
I
=
I >
A B
A>B
A=B
3
A B
A B
ORDERING INFORMATION
MC74FXXJ
MC74FXXN
MC74FXXD
Ceramic
Plastic
SOIC
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
4.5
–55
0
Typ
5.0
25
Max
5.5
125
70
Unit
V
V
Supply Voltage
Operating Ambient Temperature Range
54, 74
54
CC
T
A
°C
74
25
I
I
Output Current
Output Current
High
Low
54, 74
54, 74
–1.0
20
mA
mA
OH
OL
FAST AND LS TTL DATA
4-36