MC14585B Datasheet, PDF (1/6 Pages) ON Semiconductor – 4-Bit Magnitude Comparator

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
4-Bit Magnitude Comparator
The MC14585B 4–Bit Magnitude Comparator is constructed with comple-
mentary MOS (CMOS) enhancement mode devices. The circuit has eight
comparing inputs (A3, B3, A2, B2, A1, B1, A0, B0), three cascading inputs
(A < B, A = B, and A > B), and three outputs (A < B, A = B, and A > B). This
device compares two 4–bit words (A and B) and determines whether they
are “less than”, “equal to”, or “greater than” by a high level on the appropriate
output. For words greater than 4–bits, units can be cascaded by connecting
outputs (A > B), (A < B), and (A = B) to the corresponding inputs of the next
significant comparator. Inputs (A < B), (A = B), and (A > B) on the least
significant (first) comparator are connected to a low, a high, and a low,
respectively.
Applications include logic in CPU’s, correction and/or detection of
instrumentation conditions, comparator in testers, converters, and controls.
• Diode Protection on All Inputs
• Expandable
• Applicable to Binary or 8421–BCD Code
• Supply Voltage Range = 3.0 Vdc to 18 Vdc
• Capable of Driving Two Low–power TTL Loads or One Low–power
Schottky TTL Load over the Rated Temperature Range
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{• Can be Cascaded – See Fig. 3}
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{MAXIMUM RATINGS* (Voltages Referenced to VSS)}
Symbol
Parameter
Value
Unit
VDD DC Supply Voltage
– 0.5 to + 18.0
V
Vin, Vout Input or Output Voltage (DC or Transient) – 0.5 to VDD + 0.5 V
Iin, Iout Input or Output Current (DC or Transient),
± 10
mA
per Pin
PD Power Dissipation, per Package†
500
mW
Tstg Storage Temperature
– 65 to + 150
_C
TL
Lead Temperature (8–Second Soldering)
260
_C
* Maximum Ratings are those values beyond which damage to the device may occur.
†Temperature Derating:
Plastic “P and D/DW” Packages: – 7.0 mW/_C From 65_C To 125_C
Ceramic “L” Packages: – 12 mW/_C From 100_C To 125_C
TRUTH TABLE (x = Don’t Care)
A3, B3
A3 > B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 < B3
Inputs
Comparing
A2, B2 A1, B1 A0, B0
x
A2 > B2
A2 = B2
A2 = B2
x
x
A1 > B1
A1 = B1
x
x
x
A0 > B0
A2 = B2
A2 = B2
A2 = B2
A2 = B2
A1 = B1
A1 = B1
A1 = B1
A1 = B1
A0 = B0
A0 = B0
A0 = B0
A0 = B0
A2 = B2
A2 = B2
A2 < B2
x
A1 = B1
A1 < B1
x
x
A0 < B0
x
x
x
Cascading
Outputs
A<B A=B A>B A<B A=B A>B
x
x
x
0
0
1
x
x
x
0
0
1
x
x
x
0
0
1
x
x
x
0
0
1
0
0
x
0
0
1
0
1
x
0
1
0
1
0
x
1
0
0
1
1
x
1
1
0
x
x
x
1
0
0
x
x
x
1
0
0
x
x
x
1
0
0
x
x
x
1
0
0
REV 3
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©MMOotoTrOolaR, IOncL. A199C5MOS LOGIC DATA
MC14585B
L SUFFIX
CERAMIC
CASE 620
P SUFFIX
PLASTIC
CASE 648
D SUFFIX
SOIC
CASE 751B
ORDERING INFORMATION
MC14XXXBCP
MC14XXXBCL
MC14XXXBD
Plastic
Ceramic
SOIC
TA = – 55° to 125°C for all packages.
BLOCK DIAGRAM
4
(A > B)in
6
(A = B)in
5
(A < B)in (A > B)out
13
10
A0
11
B0
7
A1
9
B1
(A = B)out
3
2
A2
1
B2
15
A3
(A < B)out
12
14
B3
VDD = PIN 16
VSS = PIN 8
MC14585B
1