NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
www.ti.com
SLFS023G–APRIL 1978–REVISED JUNE 2006
ORDERING INFORMATION
VT (MAX)
VCC = 15 V
TA
PACKAGE(1)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
PDIP – N
Tube of 25
NE556N
NE556D
NE556DR
NE556NSR
SA556N
NA556N
NA556D
NA556DR
SE556J
NE556N
Tube of 50
Reel of 2500
Reel of 2000
Tube of 25
Tube of 25
Tube of 50
Reel of 2500
0°C to 70°C
11.2 V
SOIC – D
NE556
SOP – NS
PDIP – N
PDIP – N
NE556
–40°C to 85°C
–40°C to 105°C
11.2 V
11.2 V
SA556N
NA556N
SOIC – D
CDIP – J
NA556
SE556J
–55°C to 125°C
10.6 V
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
VOLTAGE(1)
DISCHARGE
SWITCH
RESET
OUTPUT
VOLTAGE(1)
Low
High
High
High
Irrelevant
<1/3 VDD
>1/3 VDD
>1/3 VDD
Irrelevant
Irrelevant
>2/3 VDD
<2/3 VDD
Low
High
Low
On
Off
On
As previously established
(1) Voltage levels shown are nominal.
FUNCTIONAL BLOCK DIAGRAM, EACH TIMER
V
CC
RESET
THRES
CONT
OUT
TRIG
DISCH
GND
RESET can override TRIG, which can override THRES.
2
Submit Documentation Feedback
TI [ TEXAS INSTRUMENTS ]
