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NE555 Datasheet(PDF) 15 Page - Texas Instruments

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Part No. NE555
Description  xx555 Precision Timers
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

NE555 Datasheet(HTML) 15 Page - Texas Instruments

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Time − 0.5 ms/div
Capacitor Voltage
Output Voltage
Clock Input Voltage
RA = 3 kΩ
C = 0.02
µF
RL = 1 kΩ
See Figure 18
Modulation Input Voltage
NA555, NE555, SA555, SE555
www.ti.com
SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014
Typical Applications (continued)
9.2.2.1 Design Requirements
Clock input must have VOL and VOH levels that are less than and greater than 1/3 VCC. Modulation input can
vary from ground to VCC. The application must be tolerant of a nonlinear transfer function; the relationship
between modulation input and pulse width is not linear because the capacitor charge is based RC on an negative
exponential curve.
9.2.2.2 Detailed Design Procedure
Choose RA and C so that RA × C = 1/4 [clock input period]. RL improves VOH, but it is not required for TTL
compatibility.
9.2.2.3 Application Curves
Figure 19. Pulse-Width-Modulation Waveforms
9.2.3 Pulse-Position Modulation
As shown in Figure 20, any of these timers can be used as a pulse-position modulator. This application
modulates the threshold voltage and, thereby, the time delay, of a free-running oscillator. Figure 21 shows a
triangular-wave modulation signal for such a circuit; however, any wave shape could be used.
Copyright © 1973–2014, Texas Instruments Incorporated
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Product Folder Links: NA555 NE555 SA555 SE555


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