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NE555 SA555 - SE555
GENERAL PURPOSE SINGLE 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% PERoC
N DIP8 (Plastic Package) D SO8 (PlasticMicropackage)

DESCRIPTION The NE555 monolithic timing circuit is a highly stable controller capableof producing accuratetime delays or oscillation. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor.For a stableoperation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistorsand one capacitor. The circuit may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200mA. The NE555 is available in plastic and ceramic minidip package and in a 8-lead micropackage and in metal can package version. PIN CONNECTIONS (top view)

ORDER CODES
Part Number NE555 SA555 SE555 Temperature Range 0oC, 70oC –40 C, 105 C –55 C, 125 C
o o o oPackage N • • • D • • •

1 2 3 4

8 7 6 5

1 2 3 4 5 6 7 8

- GND - Trigger - Output - Reset - Control voltage - Threshold - Discharge - VCC

July 1998

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NE555/SA555/SE555
BLOCK DIAGRAM
VCC+

5kΩ COMP THRESHOLD CONTROL VOLTAGE R FLIP-FLOP 5kΩ COMP TRIGGER

DISCHARGE

Q OUT S INHIBIT/ RESET

5kΩ

RESET

S

S - 808 6

SCHEMATIC DIAGRAM
CONTROL VOLTAGE THRESHOLDCOMPARATOR 5 R1 4.7kΩ R2 830Ω R3 4.7kΩ OUTPUT

VCC

R4 R8 1kΩ 5kΩ

R12 6.8kΩ
Q21 Q19 Q20 Q22

Q5

Q6

Q7

Q8

Q9

Ρ13
R11 5kΩ THRESHOLD Q1 Q2 Q3 Q11 Q12 TRIGGER 2 Q10 Q4 3.9kΩ 3

R17 4.7kΩ
Q23

D1

R9 5kΩ
Q13 Q16

D2

R14 220Ω
Q24

Q18

R16 100Ω

R15 4.7kΩ

RES ET DISCHARGE

4 7 Q14 1

Q15 Q17 R5 10kΩ R6 100kΩ R7 100kΩ

R10 5kΩ

G ND

TRIGGERCOMPARATOR

FLIP FLOP

ABSOLUTE MAXIMUM RATINGS
Symbol Vcc Toper Supply Voltage Operating Free Air Temperature Range for NE555 for SA555 for SE555 Parameter Value 18 0 to 70 –40 to 105 –55 to 125 150 –65 to 150 Unit V
o

C

Tj Tstg

Junction Temperature Storage Temperature Range

o o

C C

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NE555/SA555/SE555
OPERATING CONDITIONS
Symbol VCC Vth, Vtrig, Vcl, Vreset SupplyVoltage Maximum Input Voltage Parameter SE555 4.5 to 18 VCC NE555 - SA555 4.5 to 18 VCC Unit V V

ELECTRICAL CHARACTERISTICS T amb = +25oC, VCC = +5V to +15V (unless otherwise specified)
Symbol ICC Parameter Supply Current (RL ∞) (- note 1) 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 TemperatureDrift with Supply Voltage Timing Error (astable) (RA, RB = 1kΩ to 100kΩ, C = 0.1µF, VCC = +15V) Initial Accuracy - (note 2) Drift with Temperature 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 1.5V 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 SE555 Min. Typ. 3 10 2 Max. 5 12 NE555 - SA555 Min. Typ. 3 10 2 Max. 6 15 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...
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