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LM555 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer LM555
Beschreibung Timer
Hersteller National Semiconductor
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Gesamt 12 Seiten
LM555 Datasheet, Funktion
July 2006
LM555
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 200mA or drive
TTL circuits.
Features
n Direct replacement for SE555/NE555
n Timing from microseconds through hours
n Operates in both astable and monostable modes
n Adjustable duty cycle
n Output can source or sink 200 mA
n Output and supply TTL compatible
n Temperature stability better than 0.005% per ˚C
n Normally on and normally off output
n Available in 8-pin MSOP package
Applications
n Precision timing
n Pulse generation
n Sequential timing
n Time delay generation
n Pulse width modulation
n Pulse position modulation
n Linear ramp generator
Schematic Diagram
© 2006 National Semiconductor Corporation DS007851
00785101
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LM555 Datasheet, Funktion
Typical Performance Characteristics (Continued)
Output Propagation Delay vs.
Voltage Level of Trigger Pulse
Output Propagation Delay vs.
Voltage Level of Trigger Pulse
Discharge Transistor (Pin 7)
Voltage vs. Sink Current
00785124
00785125
Discharge Transistor (Pin 7)
Voltage vs. Sink Current
00785126
00785127
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LM555 pdf, datenblatt
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Molded Dual-In-Line Package (N)
NS Package Number N08E
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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