MC74F85 반도체 회로 부품 판매점
4-BIT MAGNITUDE COMPARATOR FAST SCHOTTKY TTL
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 Motorola Semiconductors |
4-BIT MAGNITUDE COMPARATOR
The MC54/74F85 is a 4-Bit Magnitude Comparator which compares two
4-Bit words (A0-A3, B0-B3), A3, B3beingthemostsignificantinputs. 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
16 15 14 13 12 11 10
B0
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
MC54/74F85
FUNCTION TABLE
Comparing Inputs
A3, B3
A2, B2
A3 > B3
X
A3 < B3
X
A3 = B3
A2 > B2
A3 = B3
A2 < B2
A3 = B3
A2 = B2
A3 = B3
A2 = B2
A3 = B3
A2 = B2
A3 = B3
A2 = B2
A3 = B3
A2 = B2
A3 = B3
A2 = B2
A3 = B3
A2 = B2
A3 = B3
A2 = B2
A3 = B3
A2 = B2
A3 = B3
A2 = B2
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
A1, B1
X
X
X
X
A1 > B1
A1 < B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
A0, B0
X
X
X
X
X
X
A0 > B0
A0 < B0
A0 = B0
A0 = B0
A0 = B0
A0 = B0
A0 = B0
A0 = B0
Expansion Inputs
IA > B
X
IA < B
X
IA = B
X
XXX
XXX
XXX
XXX
XXX
XXX
XXX
HL L
LHL
L LH
XXH
HH L
LLL
A>B
H
L
H
L
H
L
H
L
H
L
L
L
L
H
Outputs
A<B
L
H
L
H
L
H
L
H
L
H
L
L
L
H
A=B
L
L
L
L
L
L
L
L
L
L
H
H
L
L
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH
VIL
VIK
VOH
VOL
IIH
IIL
IOS
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
Output LOW Voltage
Input HIGH Current
Input LOW Current
Output Short Circuit Current (Note 2)
Total Supply Current
2.0
54, 74
74
2.5
2.7
–60
V Guaranteed Input HIGH Voltage
0.8 V Guaranteed Input LOW Voltage
–1.2 V VCC = MIN, IIN = –18 mA
V IOH = –1.0 mA VCC = 4.50 V
VCC = 4.75 V
0.5 V IOL = 20 mA, VCC = MIN
20 µA VCC = MAX, VIN = 2.7 V
0.1 mA VCC = 0 V, VIN = 7.0 V
–20 µA VCC = MAX, VIN = 0.5 V
–150 mA VCC = MAX, VOUT = 0 V
ICC HIGH VIN = HIGH
50 mA VCC = MAX
LOW An = Bn = IA-B = GND: IA>B = IA<B = 4.5 V
54
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
4-37
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