LMC555CMM/HALF National Semiconductor, LMC555CMM/HALF Datasheet - Page 7
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LMC555CMM/HALF
Manufacturer Part Number
LMC555CMM/HALF
Description
Manufacturer
National Semiconductor
Type
Standardr
Datasheet
1.LMC555CMMHALF.pdf
(12 pages)
Specifications of LMC555CMM/HALF
# Internal Timers
1
Power Dissipation
555mW
Propagation Delay Time
100ns
Operating Supply Voltage (typ)
1.5V
Package Type
MSOP
High Level Output Current
-10mA
Low Level Output Current
50mA
Pin Count
8
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Lead Free Status / Rohs Status
Compliant
Application Information
V
TIME = 0.2 ms/Div. Bottom Trace: Output Voltage 2 V/Div.
R
C = 0.01 µF
PULSE POSITION MODULATOR
This application uses the timer connected for astable opera-
tion, as in Figure 10, with a modulating signal again applied
to the control voltage terminal. The pulse position varies with
the modulating signal, since the threshold voltage and hence
the time delay is varied. Figure 11 shows the waveforms
generated for a triangle wave modulation signal.
CC
A
= 9.1 kΩ
= 5V
FIGURE 9. Pulse Width Modulator Waveforms
FIGURE 10. Pulse Position Modulator
Top Trace: Modulation 1 V/Div.
(Continued)
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V
TIME = 0.1 ms/Div.
R
R
C = 0.01 µF
50% DUTY CYCLE OSCILLATOR
The frequency of oscillation is
Bumps are numbered counter-clockwise
CC
A
B
= 3.9 kΩ
= 3 kΩ
FIGURE 11. Pulse Position Modulator Waveforms
= 5V
f = 1/(1.4 R
FIGURE 12. 50% Duty Cycle Oscillator
micro SMD Marking Orientation
C
C)
Bottom Trace: Output Voltage 2 V/Div.
Top Trace: Modulation Input 1 V/Div.
Top View
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