NA555_08 Datasheet, PDF (1/27 Pages) Texas Instruments – PRECISION TIMERS

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FEATURES
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• Timing From Microseconds to Hours
• Astable or Monostable Operation
NA555...D OR P PACKAGE
NE555...D, P, PS, OR PW PACKAGE
SA555...D OR P PACKAGE
SE555...D, JG, OR P PACKAGE
(TOP VIEW)
GND 1
TRIG 2
OUT 3
RESET 4
8 V_CC
7 DISCH
6 THRES
5 CONT
NA555, NE555, SA555, SE555
PRECISION TIMERS
SLFS022G – SEPTEMBER 1973 – REVISED MARCH 2008
• Adjustable Duty Cycle
• TTL-Compatible Output Can Sink or Source up
to 200 mA
SE555...FK PACKAGE
(TOP VIEW)
NC
TRIG
NC
OUT
NC
3 2 1 20 19
4
18
5
17
6
16
7
15
8
14
9 10 11 12 13
NC
DISCH
NC
THRES
NC
NC – No internal connection
DESCRIPTION/ORDERING INFORMATION
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 V_CC. 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.
The output circuit is capable of sinking or sourcing current up to 200 mA. Operation is specified for supplies of
5 V to 15 V. With a 5-V supply, output levels are compatible with TTL inputs.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1973–2008, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are
tested unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.