CD54HC85 Datasheet, PDF (7/15 Pages) Texas Instruments – High-Speed CMOS Logic 4-Bit Magnitude Comparator

CD54HC85, CD74HC85, CD54HCT85, CD74HCT85
Test Circuits and Waveforms
B1
A1
B0
A0
GND
VCC
GND
B3
CD74HC85
CD74HCT85
A3
B2
A2 (A < B) OUT
B1 (A = B) OUT
A1 _{(A > B) OUT}
B0
A0
(A < B) IN
(A = B) IN
(A > B) IN
B6
A6
B5
A5
B4
A4
B3
A3
B2
GND
A2
B3
CD74HC85
CD74HCT85
A3
B2
A2 (A < B) OUT
B1 (A = B) OUT
A1 (A > B) OUT
B0
A0
(A < B) IN
(A = B) IN
(A > B) IN
B11
B3
CD74HC85
CD74HCT85
A11 A3
B10 B2
A10 A2 (A < B) OUT
B9 B1 (A = B) OUT
NC
A9 A1 (A > B) OUT
B8 B0
A8 A0
B7 (A < B) IN
GND (A = B) IN
A7 (A > B) IN
NC
B3
CD74HC85
CD74HCT85
A3
B2
OUTPUTS
A2 _{(A > B) OUT}
B1 _{(A = B) OUT}
A1 _{(A < B) OUT}
B0
A0
(A < B) IN
(A = B) IN
(A > B) IN
FIGURE 4. PARALLEL CASCADING - COMPARING 12-BIT WORDS
OUTPUTS
7