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NE556 SA556 - SE556
GENERAL PURPOSE DUAL BIPOLAR TIMERS

. . . . . . . .

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

N DIP14 (Plastic Package)

D SO14 (PlasticMicropackage)

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 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 twoexternal 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
o o –55 C, 125 C o o o o

Pakcage N • • • D • • •

Discharge Threshold

1 2

14 13 12 11 10 9 8

VCC Discharge ThresholdControl Voltage Reset Output Trigger

Control Voltage 3 Reset Output Trigger GND 4 5 6 7

July 1998

1/9

NE556/SA556/SE556
BLOCK DIAGRAM
VCC+
5kW THRESHOLD CONTROL VOLTAGE COMP R FLIP-FLOP 5kW COMP TRIGGER

DISCHARGE

Q OUT 1/2 NE556 S INHIBIT/ RESET

5kW

RESET

S

SCHEMATIC DIAGRAM
CONTROL VOLTAGE THRESHOLD COMPARATOR VCC R1 4.7kW R2 830W R3 4.7kW R4 R8 1kW 5kW 5 R12 6.8kWQ21 Q5 Q6 Q7 Q8 Q9 Q19 Q20 31R R11 5kW THRESHOLD Q1 Q2 Q3 Q11 Q12 TRIGGER 2 Q10 Q4 R9 5kW Q13 Q16 RESET DISCHARGE 4 7 Q14 GND 1 Q15 Q17 R5 10kW R6 100kW R7 100kW R10 5kW Q18 R16 100W R15 4.7kW D2 R17 4.7kW Q23 3.9kW D1 R14 220W Q24 3 Q22

OUTPUT

TRIGGER COMPARATOR

FLIP FLOP

ABSOLUTE MAXIMUM RATINGS
Symbol Vcc Toper Supply Voltage Operating Free Air Temperature Range for NE556 forSA556 for SE556 Parameter Value 18 0 to 70 –40 to 105 –55 to 125 150 – 65 to 150 Unit V °C °C °C

Tj Tstg

Junction Temperature Storage Temperature Range

2/9

NE556/SA556/SE556
OPERATING CONDITIONS
Symbol VCC Vth, Vtrig, Vcl, Vreset Supply Voltage Maximum Input Voltage Parameter SE556 4.5 to 18 VCC NE556 - SA556 4.5 to 18 VCC Unit V V

ELECTRICAL CHARACTERISTICS Tamb = +25oC, VCC = +5Vto +15V (unless otherwise specified)
Symbol ICC Parameter Supply Current (RL ∞) (- note 1) - (2 timers) Low State VCC = +5V VCC = +15V High State VCC = 5V Timing Error (monostable) (RA = 2k to 100kΩ, C = 0.1µF) Initial Accuracy - (note 2) Drift with Temperature Drift with Supply Voltage Timing Error (astable) (RA, RB = 1kΩ to 100kΩ, C = 0.1µF, VCC = +15V) Initial Accuracy - (note 2) Drift withTemperature Drift with Supply Voltage VCL Control Voltage level VCC = +15V VCC = +5V Threshold Voltage VCC = +15V VCC = +5V Threshold Current - (note 3) Trigger Voltage VCC = +15V VCC = +5V Trigger Current (Vtrig = 0V) Reset Voltage - (note 4) Reset Current Vreset = +0.4V Vreset = 0V VOL Low Level Output Voltage VCC = +15V, IO(sink) = 10mA IO(sink) = 50mA IO(sink) = 100mA IO(sink) = 200mA VCC = +5V,IO(sink) = 8mA IO(sink) = 5mA High Level Output Voltage VCC = +15V, IO(source) = 200mA IO(source) = 100mA VCC = +5V, IO(source) = 100mA 0.1 0.4 0.1 0.4 2 2.5 0.1 0.05 12.5 13.3 3.3 0.4 1 0.15 0.5 2.2 0.25 0.2 0.1 0.4 0.1 0.4 2 2.5 0.3 0.25 12.5 13.3 3.3 0.4 1.5 V 0.25 0.75 2.5 0.4 0.35 V 13 3 12.75 2.75 0.4 4.8 1.45 9.6 2.9 9.4 2.7 SE556 Min. Typ. 6 20 4 Max. 10 24 NE556 - SA556 Min. Typ. 6 20 4Max. 12 30 Unit mA

0.5 30 0.05

2 100 0.2

1 50 0.1

3 0.5

% ppm/°C %/V

1.5 90 0.15 10 3.33 10 3.33 0.1 5 1.67 0.5 0.7 10.4 3.8 10.6 4 0.25 5.2 1.9 0.9 1 0.4 4.5 1.1 9 2.6 8.8 2.4

2.25 150 0.3 10 3.33 10 3.33 0.1 5 1.67 0.5 0.7 11 4

% ppm/°C %/V V

Vth

V 11.2 4.2 0.25 5.6 2.2 2.0 1 µA V mA µA V

Ith Vtrig

Itrig Vreset Ireset

VOH

Notes :

1. Supply current...
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