LMC555CMM National Semiconductor, LMC555CMM Datasheet - Page 7

• Manufacturer Part Number: LMC555CMM
• Description: Timer IC
• Manufacturer: National Semiconductor

Specifications of LMC555CMM

• Frequency: 3MHz
• No. Of Pins: 8
• Peak Reflow Compatible (260 C): No
• Supply Voltage: 15V
• Current Rating: 150A
• Leaded Process Compatible: No
• Mounting Type: Surface Mount
• Timer Type: Timer
• Package / Case: 8-MSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-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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