LM555CMXSLASHNOPB datasheet(8/21 Pages) TI

Part #	LM555CMX/NOPB

Description	Timing from Microseconds through Hours

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Manufacturer	TI [Texas Instruments]

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8 / 21 page

LM555

SNAS548C – FEBRUARY 2000 – REVISED MARCH 2013

www.ti.com

Figure 14. Time Delay

ASTABLE OPERATION

If the circuit is connected as shown in Figure 15 (pins 2 and 6 connected) it will trigger itself and free run as a

multivibrator. The external capacitor charges through RA + RB and discharges through RB. Thus the duty cycle

may be precisely set by the ratio of these two resistors.

Figure 15. Astable

In this mode of operation, the capacitor charges and discharges between 1/3 VCC and 2/3 VCC. As in the

triggered mode, the charge and discharge times, and therefore the frequency are independent of the supply

voltage.

Figure 16 shows the waveforms generated in this mode of operation.

VCC = 5V

Top Trace: Output 5V/Div.

TIME = 20

μs/DIV.

Bottom Trace: Capacitor Voltage 1V/Div.

RA = 3.9kΩ

RB = 3kΩ

C = 0.01

μF

Figure 16. Astable Waveforms

8

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