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| CD74HC4067SM Datasheet, PDF (7/16 Pages) Texas Instruments – High-Speed CMOS Logic 16-Channel Analog Multiplexer/Demultiplexer | |||
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CD74HC4067, CD74HCT4067
Analog Test Circuits
VCC
0.1µF
SWITCH
VIS
ON
50â¦
VCC/2
VOS
10pF
dB
METER
FIGURE 4. FREQUENCY RESPONSE TEST CIRCUIT
VCC
600â¦
SWITCH
ALTERNATING
ON AND OFF
tr, tf ⤠6ns
fCONT = 1MHz
50% DUTY
CYCLE
600â¦
VCC/2
VOS
10pF
SCOPE
VCC
SINE
WAVE
10µF
VIS
SWITCH
ON
10kâ¦
fIS = 1kHz TO 10kHz
VCC/2
VOS
50pF
DISTORTION
METER
FIGURE 5. SINE WAVE DISTORTION TEST CIRCUIT
0.1µF
VIS
VCC
VC = VIL
SWITCH
OFF
R
R
VCC/2
VCC/2
fIS ⥠1MHz SINEWAVE
R = 50â¦
C = 10pF
VOS
C
dB
METER
FIGURE 6. CONTROL-TO-SWITCH FEEDTHROUGH NOISE
TEST CIRCUIT
Test Circuits and Waveforms
FIGURE 7. SWITCH OFF SIGNAL FEEDTHROUGH TEST
CIRCUIT
tr = 6ns
INPUT
90%
50%
10%
tf = 6ns
VCC
GND
tTHL
INVERTING
OUTPUT
tPHL
tTLH
90%
50%
10%
tPLH
FIGURE 8. HC TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
tr = 6ns
INPUT
tTHL
2.7V
1.3V
0.3V
INVERTING
OUTPUT
tPHL
tf = 6ns
3V
GND
tTLH
90%
1.3V
10%
tPLH
FIGURE 9. HCT TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
7
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