CD54HC85_07 Datasheet, PDF (6/17 Pages) Texas Instruments – High-Speed CMOS Logic 4-Bit Magnitude Comparator

CD54HC85, CD74HC85, CD54HCT85, CD74HCT85
Test Circuits and Waveforms
GND
V_CC
GND
A0
A1
A2
LEAST SIGNIFICANT _A3
4-BITS OF EACH WORD _B0
B1
B2
B3
A4
A5
A6
A7
B4
B5
B6
B7
A0
A1
A2
MOST SIGNIFICANT A3
4-BITS OF EACH WORD _B0
B1
B2
B3
(A > B) IN
(A = B) IN
(A < B) IN
A0
A1
A2
CD74HC85
CD74HCT85
A3
B0
B1
B2
B3
(A > B) IN
(A = B) IN
(A < B) IN
A4
A5 _CD74HC85
A6 _CD74HCT85
A7
B4
B5 ^{(A > B) OUT}
B6 ^{(A = B) OUT}
B7 (A < B) OUT
(A > B) IN
(A = B) IN
(A < B) IN
A0
A1 _CD74HC85
A2 CD74HCT85
A3
B0
B1 (A > B) OUT
B2 (A = B) OUT
B3 (A < B) OUT
FIGURE 3. SERIES CASCADING - COMPARING 12-BIT WORDS
OUTPUTS
6