MC14538B
http://onsemi.com
6
Figure 4. Switching Test Waveforms
RESET
A
B
t
PLH
Q
Q
50%
t
WH
90%
10%
t
TLH
t
THL
t
WL
t
THL
t
PHL
t
THL
90%
10%
50%
T
50% 50% 50%
90%
10%
t
PLH
t
THL
t
TLH
t
PHL
t
WL
50%
90%
10%
t
PHL
t
PHL
t
TLH
t
THL
t
PLH
50% 50%
90%
10%
50%
50%
50%
t
rr
50% V
DD
V
DD
V
DD
t
TLH
Figure 5. Typical Normalized Distribution
of Units for Output Pulse Width
Figure 6. Typical Pulse Width Variation as
a Function of Supply Voltage V
DD
0
0.2
0.4
0.6
0.8
1.0
-4 -2 0 2 4
T, OUTPUT PULSE WIDTH (%)
RELATIVE FREQUENCY OF OCCURRENCE
2
1
0
1
2
15141312111098765
V
DD
, SUPPLY VOLTAGE (VOLTS)
NORMALIZED PULSE WIDTH CHANGE
WITH RESPECT TO VALUE AT V
DD
= 10 V (%)
T
A
= 25°C
R
X
= 100 kW
C
X
= 0.1 mF
0% POINT PULSE WIDTH
V
DD
= 5.0 V, T = 9.8 ms
V
DD
= 10 V, T = 10 ms
V
DD
= 15 V, T = 10.2 ms
R
X
= 100 kW
C
X
= 0.1 mF
Figure 7. Typical Total Supply Current
versus Output Duty Cycle
TOTAL SUPPLY CURRENT ( A)μ
1000
100
10
1.0
0.1
0.001 0.1 1.0 10 100
OUTPUT DUTY CYCLE (%)
R
X
= 100 kW, C
L
= 50 pF
ONE MONOSTABLE SWITCHING ONLY
V
DD
= 15 V
10 V
5.0 V
FUNCTION TABLE
Inputs Outputs
Reset A B Q Q
H H
H L
H L Not Triggered
H H Not Triggered
H L, H, H Not Triggered
H L L, H, Not Triggered
L X X L H
X X Not Triggered