Integrated Circuits

7485
4-bit magnitude comparator
PDF datasheet
       
B3 1  • 16 Vcc
IA <B 2 15 A3
IA=B 3 14 B2
IA >B 4 13 A2
QA >B 5 12 A1
QA=B 6 11 B1
QA <B 7 10 A0
GND 8 9 B0
       
Pin Symbol Description
1 B3 word B input
2 IA <B A <B expansion input
3 IA=B A = B expansion input
4 IA >B A >B expansion input
5 QA >B A >B output
6 QA=B A = B output
7 QA <B A <B output
8 GND ground
9 B0 word B input
10 A0 word A input
11 B1 word B input
12 A1 word A input
13 A2 word A input
14 B2 word B input
15 A3 word A input
16 Vcc supply voltage


Specifications
(typical values under recommended operating conditions, unless specified)
Parameter Value Unit
Propagation delay, An , Bn to QA >B , QA <B 20 (74HC)
22 (74HCT)
ns
Propagation delay, An , Bn to QA=B 18 (74HC)
20 (74HCT)
ns
Propagation delay, IA <B , IA=B , IA >B to QA <B , QA >B 15 (74HC)
15 (74HCT)
ns
Propagation delay, IA=B to QA=B 11 (74HC)
15 (74HCT)
ns

Notes
  • The least significant (or only) comparator in a chain should have IA <B and IA >B tied low and IA=B tied high.
  • To compare more than 4 bits, connect the outputs to the expansion inputs of the next significant comparator.

Note
Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.

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