NE555, NE555Y, SA555, SE555, SE555C
PRECISION TIMERS
SLFS022 – SEPTEMBER 1973 – REVISED FEBRUARY 1992
Timing From Microseconds to Hours
Astable or Monostable Operation
Adjustable Duty Cycle
D, JG, OR P PACKAGE
(TOP VIEW)
GND
TRIG
OUT
V
CC
1
2
3
4
8
7
6
5
TTL-Compatible Output Can Sink or
Source up to 200 mA
DISCH
THRES
CONT
RESET
Functionally Interchangeable With the
Signetics NE555, SA555, SE555, SE555C;
Have Same Pinout
FK PACKAGE
(TOP VIEW)
SE555C FROM TI IS NOT RECOMMENDED
FOR NEW DESIGNS
3
2
1
20 19
18
description
NC
NC
4
5
6
7
8
DISCH
NC
TRIG
NC
17
16
15
14
These devices are precision monolithic timing
circuitscapableofproducingaccuratetimedelays
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 may be independently
controlled with two external resistors and a single
external capacitor.
THRES
NC
OUT
NC
9 10 11 12 13
NC–No internal connection
The threshold and trigger levels are normally two-thirds and one-third, respectively, of V . These levels can
CC
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. RESET 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.
Whenever the output is low, a low-impedance path is provided between 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.
The NE555 is characterized for operation from 0°C to 70°C. The SA555 is characterized for operation from
–40°C to 85°C. The SE555 and SE555C are characterized for operation over the full military range of –55°C
to 125°C.
AVAILABLE OPTIONS
PACKAGE
CHIP FORM
T
V
V
max
SMALL OUTLINE
(D)
CHIP CARRIER
(FK)
CERAMIC DIP
(J)
PLASTIC DIP
(P)
A
THRES
= 15 V
(Y)
CC
11.2 V
0°C to 70°C
NE555D
SA555D
NE555P
SA555P
–40°C to 85°C
11.2 V
NE555Y
10.6 V
11.2 V
SE555D
SE555CD
SE555FK
SE555CFK
SE555JG
SE555CJG
SE555P
SE555CP
–55°C to 125°C
The D package is available taped and reeled. Add the suffix R to the device type (e.g., NE555DR).
Copyright 1992, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265