t − Time − 1 s/div

See Figure 22

Output A

Output B

Output C

t = 0

NA555, NE555, SA555, SE555

SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014

www.ti.com

Typical Applications (continued)

9.2.4.1 Design Requirements

The sequential timer application chains together multiple mono-stable timers. The joining components are the 33-

k

Ω resistors and 0.001-µF capacitors. The output high to low edge passes a 10-µs start pulse to the next

monostable.

9.2.4.2 Detailed Design Procedure

9.2.4.3 Application Curves

Figure 23. Sequential Timer Waveforms

10 Power Supply Recommendations

The devices are designed to operate from an input voltage supply range between 4.5 V and 16 V. (18 V for

SE555). A bypass capacitor is highly recommended from VCC to ground pin; ceramic 0.1 µF capacitor is

sufficient.

18

Submit Documentation Feedback

Copyright © 1973–2014, Texas Instruments Incorporated

Product Folder Links: NA555 NE555 SA555 SE555