7485

4-bit magnitude comparator


B₃	1 •	16	Vcc
I_A<B	2	15	A₃
I_A=B	3	14	B₂
I_A>B	4	13	A₂
Q_A>B	5	12	A₁
Q_A=B	6	11	B₁
Q_A<B	7	10	A₀
GND	8	9	B₀

Pin	Symbol	Description
1	B₃	word B input
2	I_A<B	A < B expansion input
3	I_A=B	A = B expansion input
4	I_A>B	A > B expansion input
5	Q_A>B	A > B output
6	Q_A=B	A = B output
7	Q_A<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, A_n, B_n to Q_A>B, Q_A<B	20 (74HC) 22 (74HCT)	ns
Propagation delay, A_n, B_n to Q_A=B	18 (74HC) 20 (74HCT)	ns
Propagation delay, I_A<B, I_A=B, I_A>B to Q_A<B, Q_A>B	15 (74HC) 15 (74HCT)	ns
Propagation delay, I_A=B to Q_A=B	11 (74HC) 15 (74HCT)	ns

Notes

The least significant (or only) comparator in a chain should have I_A<B and I_A>B tied low and I_A=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.