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PDF LM555I Data sheet ( Hoja de datos )
| Número de pieza | LM555I | |
| Descripción | SINGLE TIMER | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM555I (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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LM555/I
SINGLE TIMER
SINGLE TIMER
The LM555/I is a highly stable controller capable of producing accurate
timing pulses. With monostable operation, the time delay is controlled
by one external and one capacitor. With astable operation, the frequency
and duty cycle are accurately controlled with two external resistors and
one capacitor.
8 DIP
FEATURES
• High Current Drive Capability (= 200mA)
• Adjustable Duty Cycle
• Temperature Stability of 0.005%/°C
• Timing From µSec To Hours
• Turn Off Time Less Than 2µSec
8 SOP
APPLICATIONS
• Precision Timing
• Pulse Generation
• Time Delay Generation
• Sequential Timing
ORDERING INFORMATION
BLOCK DIAGRAM
Device Package
LM555CN 8 DIP
LM555CM 8 SOP
LM555CIN 8 DIP
LM555CIM 8 SOP
Operating Temperature
0 ~ +70°C
-40 ~ +85°C
©1999 Fairchild Semiconductor Corporation
Rev. B
1 page  
LM555/I
SINGLE TIMER
Astable Operation
The LM555 can free run as a mulitivibrator by triggering itself; refer to Fig.2. The output can swing from VDD to GND and have
50 duty cycle square wave. Less than 1% frequency deviation can be observed, over a voltage range of 2 to 5V. f-1/1.4RC
GND
///
1
TRIGGER
2
OUTPUT
Ο•
3
VΟCC
RESET 4
LM555C
Ο VCC
10KΩ
8 Ο VCC
DISCHARGE
7 •Ο
ALTERNATE
OUTPUT
THRESHOLD
6
5
•
Fig. 1. Astable Operation
Monostable Operation
•
C
///
The LM555 can be used as a one-short, i.e. monostable multivibrator. Initially, because the inside discharge transistor is on
state, external timing capacitor is held to GND potential. Upon application of a negative TRIGGER pulse pin 2, the intern
discharge transistor is off state and the voltage across the capacitor increases with time constant T = RAC and OUTPUT
goes to high state. When the voltage across the capacitor equals 2/3VCC the inner comparator is reset by THRESHOLD
input and the discharge transistor goes to on state, which in turn discharges the capacitor rapidly and drives the OUTPUT
to its low state.
VCC ( 18V)
Ο
///
TRIGΟGER
OUTPUT
RA
1 8•
2
DISCHARGE
7•
LM555C
THRESHOLD
3 6•
RESET
Ο
4
CONTROL
5 VOLTAGE
OPTION
CAPACITOR
///
Fig. 2. Monostable Operation
C
///
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LM555I.PDF ] | |
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