LM555C

LM555 LM555C Timer February 1995 LM555 LM555C Timer General Description The LM555 is a highly stable device for generating accurate time delays or oscillation Additional terminals are provided for triggering or resetting if desired In the time delay mode of operation the time is precisely controlled by one external resistor and capacitor For astable operation as an oscillator the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor The circuit may be triggered and reset on falling waveforms and the output circuit can source or sink up to 200 mA or drive TTL circuits Features Y Direct replacement for SE555 NE555 Y Timing from microseconds through hours Y Operates in both astable and monostable modes Y Adjustable duty cycle Y Output can source or sink 200 mA Y Output and supply TTL compatible Y Temperature stability better than 0 005% per C Y Normally on and normally off output Applications Y Precision timing Y Pulse generation Y Sequential timing Y Time delay generation Y Pulse width modulation Y Pulse position modulation Y Linear ramp generator Schematic Diagram C1995 National Semiconductor Corporation TL H 7851 TL H 7851 – 1 RRD-B30M115 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage a18V Power Dissipation (Note 1) LM555H LM555CH LM555 LM555CN ...