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NE556DT-SA556-SA556D
GENERAL PURPOSE DUAL BIPOLAR TIMERS
July 1998 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 oC
ORDER CODES
DESCRIPTIONThe 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 one exter-
nal resistor and capacitor. For a stable operation as
an oscillator, the free running frequency and the duty
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.
GENERAL PURPOSE DUAL BIPOLAR TIMERS
PIN CONNECTIONS (top view)
NE556
SA556 - SE5561/9
ABSOLUTE MAXIMUM RATINGS
BLOCK DIAGRAM
SCHEMATIC DIAGRAM
NE556/SA556/SE5562/9
ELECTRICAL CHARACTERISTICSTamb = +25o C, VCC = +5V to +15V (unless otherwise specified)
OPERATING CONDITIONS
NE556/SA556/SE5563/9
ELECTRICAL CHARACTERISTICS (continued)
Figure 1 : Minimum Pulse Width Required for
Trigering
Figure 2 : Supply Current versus Supply Voltage
Figure 3 : Delay Time versus Temperature
Figure 4 : Low Output Voltage versus Output
Sink Current
NE556/SA556/SE5564/9
Figure 5 : Low Output Voltage versus Output
Sink Current
Figure 6 : Low Output Voltage versus Output
Sink Current
Figure 7 : High Output Voltage Drop versus
Output
Figure 8 : Delay Time versus Supply Voltage
Figure 9 : Propagation Delay versus Voltage
Level of Trigger Value
NE556/SA556/SE5565/9
t1= 0.693 RA.C
t2 = [(RARB) ⁄ (RA + RB)] CLn
RB − 2RA
2RB − RA
f = 1
t1+ t2 RB < 1 RA ti
50% DUTY CYCLE OSCILLATOR
PULSE WIDTH MODULATOR
TYPICAL APPLICATION
NE556/SA556/SE5566/9
