NE555
PRECISION TIMER
Description
Pin Assignments
These devices are precision timing circuits capable of producing
accurate time delays or oscillation. In the time-delay or monostable
mode of operation, the timed interval is controlled by a single external
resistor and capacitor network. In the astable mode of operation, the
frequency and duty cycle can be controlled independently with two
external resistors and a single external capacitor.
(Top View)
GND
VCC
TRIG
DISCH
The threshold and trigger levels normally are two-thirds and one-third,
respectively, of VCC. These levels can be altered by use of the
OUT
THRES
control-voltage terminal. When the trigger input falls below the trigger
level, the flip-flop is set, and the output goes high. If the trigger input
is above the trigger level and the threshold input is above the
threshold level, the flip-flop is reset and the output is low. The reset
(RESET) input can override all other inputs and can be used to
initiate a new timing cycle. When RESET goes low, the flip-flop is
reset, and the output goes low. When the output is low, a lowimpedance path is provided between discharge (DISCH) and ground.
RESET
CONT
SO-8
The output circuit is capable of sinking or sourcing current up to
200mA. Operation is specified for supplies of 5V to 15V. With a 5-V
supply, output levels are compatible with TTL inputs.
Features
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Timing from microseconds to hours
Astable or monostable operation
Adjustable duty cycle
TTL compatible output can source or sink up to 200mA
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen- and Antimony-Free. “Green” Device (Note 3)
For automotive applications requiring specific change
control (i.e. parts qualified to AEC-Q100/101/200, PPAP
capable, and manufactured in IATF 16949 certified
facilities), please contact us or your local Diodes
representative.
https://www.diodes.com/quality/product-definitions/
Notes:
1. No purposely added lead. FullyEU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3).compliant.
2. See https://www.diodes.com/quality/lead-free/ formore information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain
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