NE556, SA556, SE556

DUAL PRECISION TIMERS

SLFS023C – APRIL 1978 – REVISED DECEMBER 1999

2

POST OFFICE BOX 655303

FUNCTION TABLE

(each timer)

RESET

TRIGGER VOLTAGE†

THRESHOLD VOLTAGE†

OUTPUT

DISCHARGE SWITCH

Low

Irrelevant

Irrelevant

Low

On

High

< 1/3 VDD

Irrelevant

High

Off

High

> 1/3 VDD

> 2/3 VDD

Low

On

High

> 1/3 VDD

> 2/3 VDD

As previously established

† Voltage levels shown are nominal.

functional block diagram, each timer

R1

R

S

1

OUT

RESET

VCC

CONT

R

R

R

GND

DISCH

THRES

TRIG

RESET can override TRIG, which can override THRES.

18 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage (CONT, RESET, THRES, and TRIG)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output current

±225 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total dissipation

See Dissipation Rating Table

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance,

86

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package

80

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: J package

300

°C

. . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D or N package

260

°C

. . . . . . . . . . . . . . . .

–65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡ Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES:

1. All voltage values are with respect to network ground terminal.

2. The package thermal impedance is calculated in accordance with JESD 51.

DISSIPATION RATING TABLE

PACKAGE

TA

≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

TA = 85°C

POWER RATING

TA = 125°C

POWER RATING

J

1375 mW

11.0 mW/

°C

880 mW

715 mW

275 mW