NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023C – APRIL 1978 – REVISED DECEMBER 1999
operating characteristics, V
CC
= 5 V and 15 V
PARAMETER
Each timer, monostable§
Each timer, astable¶
Timer 1 — Timer 2
Temperature coefficient of
T
t
ffi i t f
timing interval
Each timer, monostable§
Each timer, astable¶
Timer 1 — Timer 2
Supply voltage sensitivity of
S
l
lt
iti it f
timing interval
Output pulse rise time
Each timer, monostable§
Each timer, astable¶
Timer 1 — Timer 2
CL = 15 pF,
TA = 25°C
TA = 25°C
TA = MIN to MAX
TEST
CONDITIONS†
NE556, SA556
MIN
TYP
1
TA = 25°C
2.25%
±1
50
150
±10
0.1
0.3
±0.2
100
300
0.5
MAX
3
MIN
SE556
TYP
0.5
1.5%
±0.5
30
90
±10
0.05
0.15
±0.1
100
200
0.2
%/ V
100
ppm/°C
MAX
1.5
UNIT
Initial error of timing interval‡
g
ns
Output pulse fall time
100
300
100
200
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
‡ Timing interval error is defined as the difference between the measured value and the average value of a random sample from each process
run.
§ Values specified are for a device in a monostable circuit similar to Figure 2, with component values as follow: RA = 2 kΩ to 100 kΩ, C = 0.1µF.
¶ Values specified are for a device in an astable circuit similar to Figure 1, with component values as follow: RA = 1 kΩ to 100 kΩ, C = 0.1µF.
APPLICATION INFORMATION
VCC
(5 V to 15 V)
Open
(see Note A)
RA
CONT
RESET
DISCH
RB
OUT
THRES
TRIG
C
INPUT
NOTE A: Bypassing the control-voltage input to ground with
a capacitor may improve operation. This should be
evaluated for individual applications.
C
GND
THRES
TRIG
GND
OUT
VCC
RL
RA
CONT
RESET
DISCH
OUT
OUT
VCC
RL
0.01
µF
VCC
(5 V to 15 V)
Figure 1. Circuit for Astable Operation
Figure 2. Circuit for Monostable Operation
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
