®
NE556
SA556 - SE556
GENERAL PURPOSE DUAL BIPOLAR TIMERS
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LOW TURN OFF TIME
MAXIMUM
OPERATING
FREQUENCY
GREATER THAN 500kHz
TIMING FROM MICROSECONDS TO HOURS
OPERATES IN BOTH ASTABLE AND
MONOSTABLE MODES
HIGH OUTPUT CURRENT CAN SOURCE OR
SINK 200mA
ADJUSTABLE DUTY CYCLE
TTL COMPATIBLE
TEMPERATURE STABILITY OF 0.005%
PER
o
C
N
DIP14
(Plastic Package)
D
SO14
(Plastic Micropackage)
DESCRIPTION
The NE556 dual monolithic timing circuit is a highly
stable controller capable of producing accurate time
delays or oscillation. In the time delay mode of op-
eration, the time is precisely controlled by oneexter-
nal resistor and capacitor. For a stable operation as
an oscillator, the freerunningfrequencyand theduty
cycle are both accurately controlled with two exter-
nal resistors and one capacitor. The circuit may be
triggered and reset on falling waveforms, and the
output structure can source or sink up to 200mA.
PIN CONNECTIONS
(top view)
ORDER CODES
Part
Number
NE556
SA556
SE556
Temperature
Range
0 C, 70 C
–40 C, 105 C
–55 C, 125 C
o
o
o
o
o
o
Pakcage
N
•
•
•
D
•
•
•
Discharge
Thres hold
1
2
14
13
12
11
10
9
8
V
CC
Discharge
Thres hold
Control Voltage
Re s et
Output
Trigge r
Control Voltage 3
Re s et
Output
Trigger
GND
4
5
6
7
July 1998
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