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

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 oneexternal resistor and capacitor. For a stable operation as an oscillator, the freerunningfrequencyand theduty cycle are both accurately controlled with two external 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.

N DIP14 (Plastic Package)

D SO14 (Plastic Micropackage)

ORDER CODES Part Number

Temperature Range o

o

0 C, 70 C

NE556

Pakcage N

D

•

•

o

o

•

•

o

o

•

•

SA556

–40 C, 105 C

SE556

–55 C, 125 C

PIN CONNECTIONS (top view)

July 1998

Discharge

1

14

VCC

Thres hold

2

13

Discharge

Control Voltage 3

12

Thres hold

Re s et

4

11

Control Voltage

Output

5

10

Re s et

Trigger

6

9

Output

GND

7

8

Trigge r

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NE556/SA556/SE556 BLOCK DIAGRAM VC C+

5 kΩ COMP

DISCHARGE

THRES HOLD CONTROL VOLTAGE

R FLIP-FLOP 5 kΩ

Q

COMP

OUT 1/2 NE556

TRIGGER

S INHIBIT/ RESET 5 kΩ

S

RESET

SCHEMATIC DIAGRAM CONTROL VOLTAGE

OUTPUT

THRESHOLD COMPARATOR 5

VCC R2 8 30Ω

R1 4.7kΩ

R4 R8 1kΩ 5 kΩ

R3 4 .7kΩ

R12 6.8kΩ Q21

Q5

Q6

Q7

Q8

Q19

Q9

Q22

Q2 0

Ρ13 3.9 kΩ

R1 1 5kΩ THRESHOLD

Q1 Q2

Q3

2

Q23

R9 5 kΩ

Q11 Q12 TR IGGER

D2

RES ET

4

3

R14 220 Ω Q24

Q1 3

Q10

Q16

DISCHARGE

D1

R17 4.7kΩ

Q4

Q18

R16 100 Ω

R15 4.7kΩ

Q1 5

7

Q17 Q14

R5 1 0kΩ

R6 1 00 kΩ

R7 1 0 0kΩ

R10 5 kΩ

1 G ND

TR IGGER COMPARATOR

FLIP FLOP

ABSOLUTE MAXIMUM RATINGS Symbol Vcc Toper

Tj Tstg

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Parameter

Value

Supply Voltage Operating Free Air Temperature Range

Junction Temperature Storage Temperature Range

for NE556 for SA556 for SE556

Unit

18

V

0 to 70 –40 to 105 –55 to 125

°C

150

°C

– 65 to 150

°C

NE556/SA556/SE556 OPERATING CONDITIONS Symbol VCC Vth, Vtrig, Vcl, Vreset

Parameter Supply Voltage Maximum Input Voltage

SE556

NE556 - SA556

Unit

4.5 to 18

4.5 to 18

V

VCC

VCC

V

ELECTRICAL CHARACTERISTICS Tamb = +25oC, VCC = +5V to +15V (unless otherwise specified) Symbol

Parameter

ICC

Supply Current (R L ∞) (- note 1) - (2 timers) Low State VCC = +5V VCC = +15V High State VCC = 5V

VCL

Vth

Ith Vtrig

Itrig

SE556 Min.

Max.

6 20 4

Timing Error (monostable) (RA = 2k to 100kΩ, C = 0.1µF) Initial Accuracy - (note 2) Drift with Temperature Drift with Supply Voltage

0.5 30 0.05

Timing Error (astable) (RA, R B = 1kΩ to 100kΩ, C = 0.1µF, VCC = +15V) Initial Accuracy - (note 2) Drift with Temperature Drift with Supply Voltage

1.5 90 0.15

Max.

10 24

6 20 4

12 30

2 100 0.2

1 50 0.1

3 0.5

2.25 150 0.3 9 2.6

10 3.33

11 4

Threshold Voltage VCC = +15V VCC = +5V

9.4 2.7

10 3.33

10.6 4

8.8 2.4

10 3.33

11.2 4.2

0.1

0.25

0.1

0.25

5 1.67

5.2 1.9

5 1.67

5.6 2.2

0.5

0.9

0.5

2.0

0.7

1

0.7

1

V

V

Threshold Current - (note 3)

µA V

4.8 1.45

Trigger Current (Vtrig = 0V) Reset Current

% ppm/°C %/V

% ppm/°C %/V

10.4 3.8

Trigger Voltage VCC = +15V VCC = +5V

Unit mA

10 3.33

Reset Voltage - (note 4)

0.4

4.5 1.1 0.4

µA V mA

0.1 0.4

0.4 1

0.1 0.4

0.4 1.5

Low Level Output Voltage VCC = +15V, IO(sink) = 10mA IO(sink) = 50mA IO(sink) = 100mA IO(sink) = 200mA IO(sink) = 8mA VCC = +5V, IO(sink) = 5mA

0.1 0.4 2 2.5 0.1 0.05

0.15 0.5 2.2

0.1 0.4 2 2.5 0.3 0.25

0.25 0.75 2.5

High Level Output Voltage VCC = +15V, IO(source) = 200mA IO(source) = 100mA IO(source) = 100mA VCC = +5V,

12.5 13.3 3.3

Vreset = +0.4V Vreset = 0V

Notes :

Typ.

9.6 2.9

Ireset

VOH

Min.

Control Voltage level VCC = +15V VCC = +5V

Vreset

VOL

NE556 - SA556

Typ.

V

0.25 0.2

0.4 0.35 V

13 3

12.75 2.75

12.5 13.3 3.3

1. Supply current when output is high is typically 1mA less. 2. Tested at VCC = +5V and VCC = +15V. 3. This will determine the maximum value of RA + RB for +15V operation the max total is R = 20MΩ and for 5V operation the max total R = 3.5MΩ. 4. Specified with trigger input high.

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NE556/SA556/SE556 ELECTRICAL CHARACTERISTICS (continued) Symbol

Parameter

SE556 Min.

NE556 - SA556

Typ.

Max.

20

100

Min.

Typ.

Max.

20

100

Idis (off)

Discharge Pin Leakage Current (output high) (Vdis = 10V)

Vdis(sat)

Discharge pin Saturation Voltage (output low) - (note 5) VCC = +15V, Idis = 15mA VCC = +5V, Idis = 4.5mA

180 80

480 200

180 80

480 200

Output Rise Time Output Fall Time

100 100

200 200

100 100

300 300

Turn off Time - (note 6) (Vreset = VCC)

0.5

tr tf toff Notes :

Unit nA mV

0.5

ns µs

5. No protection against excessive Pin 7 current is necessary, providing the package dissipation rating will not be exceeded. 6. Time mesaured from a positive going input pulse from 0 to 0.8x VCC into the threshold to the drop from high to low of the output trigger is tied to treshold.

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

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NE556/SA556/SE556 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

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NE556/SA556/SE556 TYPICAL APPLICATION 50% DUTY CYCLE OSCILLATOR

PULSE WIDTH MODULATOR VCC

VCC

RA 51k Ω 4

14 Rs

(10)

Trigg e r

(13) 1

6 (8)

1/2 NE556 S E556 Output

RA 4 (10)

1/2 NE556 S E556

(12) 2

Output

0.01nF

C

7

(13) 1

6 (8)

22kΩ

(11) 3

5 (9)

14

(12) 2

(11) 3

5 (9)

C

7 MODULATION INPUT

t1= 0.693 RA.C  RB − 2RA  t2 = [(R ARB) ⁄ (RA + R B)] CLn    2RB − RA  1 1 f= RA ti RB < t1+ t2 2 t2

t1

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NE556/SA556/SE556 TONE BURST GENERATOR For a tone burst generator the first timer is used as a monostable and determines the tone duration when triggered by a positive pulse at pin 6. The second timer is enabled by the high output os the monostable. It is connected as an astable and determines the frequency of the tone.

Re s e t

Vcc

4

+15V

14

14

RA

Rt

Trigge r

Trigge r

5

10

6

Output

Re s e t

Discha rge 1

Discha rge 13

RB

1/2 NE556 S E556

1/2 NE556 S E556

12 Thre s hold 8 Trigge r

Control

2

3

Thre s hold C1

Output 11 C ontrol 9 Ground

0.01 µF

Ground

0.01 µ F

C2

Ground T = 1.1 R

t

.C1

1.44 f= R A + 2R B ) C

MONOSTABLE OPERATION

ASTABLE OPERATION VCC

VCC RL

RA 4

14

14

(10)

(10) 6 (8)

Trigge r

RL

RA 4

(13) 1

(13) 1

1/2 NE556 S E556

1/2 NE556 S E556

5 (9)

O utput

RB (12)

(12) Output

5 (9) 7

(11)

2

RL 7

3

RL

(11)

10nF

C

3

2

(8) 6

C

0.01nF

Opera ting frequency

T = 1.1 R A .C

1.44 f= R A + 2R B ) C

t1 = 0.693 (RA + RB) C Output High t2 = 0.693 RBC Output Low t2

t1

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NE556/SA556/SE556 PACKAGE MECHANICAL DATA 14 PINS - PLASTIC DIP

Dimensions a1 B b b1 D E e e3 F i L Z

8/9

Min. 0.51 1.39

Millimeters Typ.

Max. 1.65

Min. 0.020 0.055

0.5 0.25

Inches Typ.

0.065 0.020 0.010

20

0.787

8.5 2.54 15.24

0.335 0.100 0.600 7.1 5.1

0.280 0.201

3.3 1.27

Max.

0.130 2.54

0.050

0.100

NE556/SA556/SE556 PACKAGE MECHANICAL DATA 14 PINS - PLASTIC MICROPACKAGE (SO)

Dimensions A a1 a2 b b1 C c1 D E e e3 F G L M S

Min.

Millimeters Typ.

0.1 0.35 0.19

Max. 1.75 0.2 1.6 0.46 0.25

Min.

Inches Typ.

0.004 0.014 0.007

0.5

Max. 0.069 0.008 0.063 0.018 0.010

0.020 o

45 (typ.) 8.55 5.8

8.75 6.2

0.336 0.228

1.27 7.62 3.8 4.6 0.5

0.334 0.244 0.050 0.300

4.0 5.3 1.27 0.68

0.150 0.181 0.020

0.157 0.208 0.050 0.027

o

8 (max.)

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this pub lication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.  The ST log o is a trademark of STMicroelectronics  1998 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdo m - U.S.A.

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