MC1489, MC1489A
TEST CIRCUITS
5.0 Vdc
R
L
All diodes
1N3064
or equivalent
E
in
C
L
C
t
PLH
E
O
t
THL
t
TLH
1.5 V
1.5 V
C, capacitor is for noise filtering.
R, resistor is for threshold shifting.
t
TLH
and t
THL
measured
10% 鈭?90%
V
in
1/4
MC1489A
Response Node
V
O
E
o
R
3.0 V
50%
E
in
50%
V
R
C
L
= 15 pF = total parasitic capacitance which includes
probe and wiring capacitances
Figure 3. Switching Response
Figure 4. Response Control Node
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