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STMicroelectronics Electronic Components Datasheet

NE556N Datasheet

General-purpose dual bipolar timer

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NE556
SA556 - SE556
General-purpose dual bipolar timers
Features
Low turn-off time
Maximum operating frequency greater than
500 kHz
Timing from microseconds to hours
Operates in both astable and monostable
modes
Output can source or sink up to 200 mA
Adjustable duty cycle
TTL compatible
Temperature stability of 0.005% per °C
Description
The NE556, SA556 and SE556 dual monolithic
timing circuits are highly stable controllers
capable of producing accurate time delays or
oscillation. In the time delay mode of operation,
the time is precisely controlled by one external
resistor and capacitor. For a stable operation as
an oscillator, the free running frequency and the
duty cycle are both accurately controlled with two
external resistors and one capacitor.
The circuits may be triggered and reset on falling
waveforms, and the output structure can source
or sink up to 200 mA.
N
DIP14
(Plastic package)
D
SO14
(Plastic micropackage)
Pin connections
(top view)
Discharge 1
Threshold 2
Control Voltage 3
Reset 4
Output 5
Trigger 6
GND 7
14 VCC
13 Discharge
12 Threshold
11 Control Voltage
10 Reset
9 Output
8 Trigger
January 2009
Rev 2
1/16
www.st.com
16


STMicroelectronics Electronic Components Datasheet

NE556N Datasheet

General-purpose dual bipolar timer

No Preview Available !

Schematic diagrams
1
Schematic diagrams
Figure 1. Block diagram
VCC+
THRESHOLD
CONTROL VOLTAGE
TRIGGER
RESET
5kW
COMP
R
FLIP-FLOP
5kW
Q
COMP
S
INHIBIT/
RESET
5kW
S
NE556 - SA556 - SE556
DISCHARGE
OUT 1/2 NE556
Figure 2. Schematic diagram
THRESHOLD
COMPARATOR
VCC
R1
4.7kW
R2
R3
830W 4.7kW
CONTROL
VOLTAGE
5
R4 R8
1kW 5kW
Q19
Q5
Q6
Q7
Q8 Q9
THRESHOLD
TRIGGER
RESET
DISCHARGE
GND
R11
5kW
Q1
Q2
Q4
Q3
R9
Q11 Q12 5kW
D2
2
Q10
Q13
Q16
4
Q15
7
Q14
1
R5
10kW
R6
100kW
R7
100kW
Q17
R10
5kW
OUTPUT
R12
6.8kW
Q21
Q20
Q22
R13
3.9kW
R17
4.7kW
Q23
D1
3
R14
220W
Q24
Q18
R16
100W
R15
4.7kW
TRIGGER COMPARATOR
FLIP FLOP
2/16


Part Number NE556N
Description General-purpose dual bipolar timer
Maker ST Microelectronics
PDF Download

NE556N Datasheet PDF






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