www.ti.com

OUT

RESET

CONT

GND

DISCH

THRES

TRIG

RESET can override TRIG, which can override THRES.

NA556, NE556, SA556, SE556

DUAL PRECISION TIMERS

SLFS023G – APRIL 1978 – REVISED JUNE 2006

ORDERING INFORMATION

ORDERABLE PART NUMBER

TOP-SIDE MARKING

PDIP – N

Tube of 25

NE556N

NE556N

Tube of 50

NE556D

0

°C to 70°C

11.2 V

SOIC – D

NE556

Reel of 2500

NE556DR

SOP – NS

Reel of 2000

NE556NSR

NE556

–40

°C to 85°C

11.2 V

PDIP – N

Tube of 25

SA556N

SA556N

PDIP – N

Tube of 25

NA556N

NA556N

–40

°C to 105°C

11.2 V

Tube of 50

NA556D

SOIC – D

NA556

Reel of 2500

NA556DR

SE556J

SE556J

–55

°C to 125°C

10.6 V

CDIP – J

Tube of 25

SE556JB

SE556JB

(1)

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

FUNCTION TABLE

(each timer)

TRIGGER

THRESHOLD

DISCHARGE

RESET

OUTPUT

SWITCH

Low

Irrelevant

Irrelevant

Low

On

High

Irrelevant

High

Off

High

Low

On

High

As previously established

(1)

Voltage levels shown are nominal.

FUNCTIONAL BLOCK DIAGRAM, EACH TIMER

2

Submit Documentation Feedback