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LM555CMMX/NOPB Datasheet(PDF) 3 Page - Texas Instruments

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Part # LM555CMMX/NOPB
Description  Timer
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM555CMMX/NOPB Datasheet(HTML) 3 Page - Texas Instruments

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R
R
R
GND
TRIGGER
OUTPUT
RESET
1
2
3
4
+VCC
DISCHARGE
THRESHOLD
CONTROL
VOLTAGE
8
7
6
5
COMPAR-
ATOR
COMPAR-
ATOR
FLIP FLOP
OUTPUT
STAGE
VREF (INT)
LM555
www.ti.com
SNAS548D – FEBRUARY 2000 – REVISED JANUARY 2015
5 Pin Configuration and Functions
D, P, and DGK Packages
8-Pin PDIP, SOIC, and VSSOP
Top View
Pin Functions
PIN
I/O
DESCRIPTION
NO.
NAME
Control
Controls the threshold and trigger levels. It determines the pulse width of the output
5
Voltage
I
waveform. An external voltage applied to this pin can also be used to modulate the output
waveform
Discharge
Open collector output which discharges a capacitor between intervals (in phase with output).
7
I
It toggles the output from high to low when voltage reaches 2/3 of the supply voltage
1
GND
O
Ground reference voltage
3
Output
O
Output driven waveform
Reset
Negative pulse applied to this pin to disable or reset the timer. When not used for reset
4
I
purposes, it should be connected to VCC to avoid false triggering
Threshold
Compares the voltage applied to the terminal with a reference voltage of 2/3 Vcc. The
6
I
amplitude of voltage applied to this terminal is responsible for the set state of the flip-flop
Trigger
Responsible for transition of the flip-flop from set to reset. The output of the timer depends
2
I
on the amplitude of the external trigger pulse applied to this pin
8
V+
I
Supply voltage with respect to GND
Copyright © 2000–2015, Texas Instruments Incorporated
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