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Diodes Semiconductor Electronic Components Datasheet

NE555S Datasheet

Precision Timer

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NE555
PRECISION TIMER
Description
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.
The threshold and trigger levels normally are two-thirds and one-third,
respectively, of VCC. These levels can be altered by use of the
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 low-
impedance path is provided between discharge (DISCH) and ground.
Pin Assignments
GND
TRIG
OUT
RESET
(Top View)
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.
VCC
DISCH
THRES
CONT
Features
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 <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
NE555/SA555/NA555
Document number: DS35112 Rev. 5 - 2
1 of 14
www.diodes.com
February 2021
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

NE555S Datasheet

Precision Timer

No Preview Available !

Pin Descriptions
Pin Name
GND
TRIG
OUT
RESET
CONT
THRES
DISCH
VCC
Pin Number
1
2
3
4
5
6
7
8
Description
Ground
Trigger set 1/3VCC
Timer output
Reset active low
External adjustment of internal threshold and trigger voltages
Threshold set to 2/3 VCC
Low impedance discharge path
Chip supply voltage
NE555
Functional Block Diagram
VCC CONT
8
5
THRES 6
RESET
4
R1
R2
O
S
3 OUT
2
TRIG
1
GND
7 DISCH
RESET can override TRIG, which can override THRESH
Functional Table
RESET
Low
High
High
High
Nominal Trigger
Voltage
Irrelevant
<1/3VCC
>1/3VCC
>1/3VCC
Threshold
Voltage
Irrelevant
Irrelevant
>2/3VCC
<2/3VCC
Output
Discharge
Switch
Low
On
High
Off
Low
On
As previously established
NE555/SA555/NA555
Document number: DS35112 Rev. 5 - 2
2 of 14
www.diodes.com
February 2021
© Diodes Incorporated


Part Number NE555S
Description Precision Timer
Maker Diodes
PDF Download

NE555S Datasheet PDF






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