NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023C – APRIL 1978 – REVISED DECEMBER 1999
FUNCTION TABLE
(each timer)
RESET
Low
High
High
High
TRIGGER VOLTAGE†
Irrelevant
< 1/3 VDD
> 1/3 VDD
> 1/3 VDD
THRESHOLD VOLTAGE†
Irrelevant
Irrelevant
> 2/3 VDD
> 2/3 VDD
OUTPUT
Low
High
Low
DISCHARGE SWITCH
On
Off
On
As previously established
† Voltage levels shown are nominal.
functional block diagram, each timer
VCC
R
THRES
CONT
R
RESET
R1
R
S
1
OUT
TRIG
R
DISCH
GND
RESET can override TRIG, which can override THRES.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage, V
CC
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V
Input voltage (CONT, RESET, THRES, and TRIG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
CC
Output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
225 mA
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Package thermal impedance,
θ
JA
(see Note 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 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
J
TA
≤
25°C
POWER RATING
1375 mW
DERATING FACTOR
ABOVE TA = 25°C
11.0 mW/°C
TA = 70°C
POWER RATING
880 mW
TA = 85°C
POWER RATING
715 mW
TA = 125°C
POWER RATING
275 mW
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
