MC5474F85 Datasheet, PDF (1/4 Pages) Motorola, Inc – 4-BIT MAGNITUDE COMPARATOR FAST SCHOTTKY TTL

4-BIT MAGNITUDE COMPARATOR
The MC54/74F85 is a 4-Bit Magnitude Comparator which compares two
4-Bit words (A0-A3, B0-B3), A3, B3 being the most significant inputs. Operation
is not restricted to binary codes; the device will work with any monotonic code.
Three Outputs are provided: “A greater than B” (0A > _B), “A less than B” (0A
< _B), “A equal to B” (0A = _B). Three Expander Inputs, IA > _B, IA < _B, IA = _B, allow
cascading without external gates. For proper compare operation, the Expan-
der Inputs to the least significant position must be connected as follows: IA <
B ^{= IA >} B ^{= L, IA =} B ^{= H. For serial (ripple) expansion the 0A >} B, ^{0A <} B ^Outputs
are connected respectively to the IA > _B and IA = _B inputs of the next most sig-
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
• ESD ^> 4000 Volts
CONNECTION DIAGRAM
VCC A3 B2 A2 A1 B1 A0 B0
16 15 14 13 12 11 10 9
12345678
B3 IA<B IA=B IA>B A>B A=B A<B GND
MC54/74F85
4-BIT MAGNITUDE COMPARATOR
FAST™ SCHOTTKY TTL
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
MC74FXXJ
MC74FXXN
MC74FXXD
Ceramic
Plastic
SOIC
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
TA
Supply Voltage
Operating Ambient Temperature Range
IOH
Output Current  High
IOL
Output Current  Low
Min
Typ
Max
Unit
54, 74
4.5
5.0
5.5
V
54
–55
25
125
°C
74
0
25
70
54, 74
–1.0
mA
54, 74
20
mA
FAST AND LS TTL DATA
4-36