PULSE GEN.
Z O = 50 Ω
tf = tr = 5 ns
IF
1
INPUT
MONITORING
3
NODE
RM
V CC 6
5
4
GND
+5 V
0.1μF
BYPASS
*C L
RL
OUTPUT V O
MONITORING
NODE
*CL IS APPROXIMATELY 15 pF WHICH INCLUDES
PROBE AND STRAY WIRING CAPACITANCE.
INPUT
IF
tPHL
OUTPUT
VO
IF = 6.5 mA
IF = 3.25 mA
tPLH
1.5 V
Figure 6. Test Circuit for tPHL and tPLH
120
VCC = 5.0V
IF = 6.5mA
100
80
60
40
t PLH, RL = 4kΩ
t PLH, R L = 1kΩ
tPLH, R L = 350Ω
t PHL
RL= 350Ω
1kΩ
4kΩ
20
0
-60 -40 -20
0
20 40 60 80
TA - TEMPERATURE - oC
100 120 140
Figure 7. Propagation Delay vs. Temperature
90
VCC= 5.0V
TA = 25oC
80
70
t PLH , R L = 4Ω
60
t PLH, R L= 1kΩ
50
tPLH, R L= 350Ω
40
tPHL
RL = 350Ω
1kΩ
4kΩ
30
3
5
7
9
IF - PULSE INPUT CURRENT - mA
Figure 8. Propagation Delay vs. Pulse Input Current
7