MC14538BFL2 View Datasheet(PDF) - ON Semiconductor
Part Name
Description
MFG CO.
MC14538BFL2 Datasheet PDF : 12 Pages
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VSS
PULSE
GENERATOR
PULSE
GENERATOR
PULSE
GENERATOR
MC14538B
VDD
RX
CX
RX′
CX′
A
CX/RX
* CL = 50 pF
VSS
B
RESET
A′
B′
RESET′
Q
CL
Q
Q′
CL
CL
Q′
CL
VSS
INPUT CONNECTIONS
Characteristics
Reset
A
tPLH, tPHL, tTLH, tTHL,
T, tWH, tWL
tPLH, tPHL, tTLH, tTHL,
T, tWH, tWL
VDD
VDD
PG1
VSS
tPLH(R), tPHL(R),
tWH, tWL
PG3 PG1
* Includes capacitance of probes,
wiring, and fixture parasitic.
NOTE: Switching test waveforms
for PG1, PG2, PG3 are shown
In Figure 4.
PG1 =
PG2 =
PG3 =
Figure 3. Switching Test Circuit
B
VDD
PG2
PG2
50%
A
tWH
90%
10%
tTLH
tTHL
B
50%
tTHL
tTLH
90%
10%
tWL
RESET
tPLH
Q
T
50%
tPLH
50% 50%
tPHL tPHL
tTHL
90%
10%
tTLH
tTHL
90%
10%
tTLH
tTHL
tPHL
50%
tWL
tPHL
tPLH
Q
50%
50%
90%
50%
10%
Figure 4. Switching Test Waveforms
50%
VDD
VDD
VDD
trr
50%
50%
TA = 25°C
RX = 100 kΩ
CX = 0.1 µF
1.0
0.8
0% POINT PULSE WIDTH
VDD = 5.0 V, T = 9.8 ms
VDD = 10 V, T = 10 ms
VDD = 15 V, T = 10.2 ms
0.6
0.4
0.2
0
–4 –2 0 2 4
T, OUTPUT PULSE WIDTH (%)
Figure 5. Typical Normalized Distribution
of Units for Output Pulse Width
RX = 100 kΩ
CX = 0.1 µF
2
1
0
1
2
5 6 7 8 9 10 11 12 13 14 15
VDD, SUPPLY VOLTAGE (VOLTS)
Figure 6. Typical Pulse Width Variation as
a Function of Supply Voltage VDD
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