Philips Semiconductors Linear Products
Product specification
Dual timer
NE/SA/SE556/NE556-1
ELECTRICAL CHARACTERISTICS
(Continued)
SYMBOL
Matching
PARAMETER
characteristics
4
0.5
10
0.1
0.2
1.0
1.0
±10
0.2
0.5
2.0
%
ppm/°C
%/V
TEST CONDITIONS
Min
Initial accuracy
2
Drift with temperature
Drift with supply voltage
SE556/556-1
Typ
Max
NE/SA556/SE556C
NE556-1/SE556-1C
Min
Typ
Max
UNIT
NOTES:
1. Supply current when output is high is typically 1.0mA less.
2. Tested at V
CC
=5V and V
CC
=15V.
3. This will determine maximum value of R
A
+R
B
. For 15V operation, the max total R=10MΩ, and for 5V operation, the maximum total
R=3.4MΩ.
4. Matching characteristics refer to the difference between performance characteristics for each timer section in the monostable mode.
5. Specified with trigger input high. In order to guarantee reset the voltage at reset pin must be less than or equal to 0.4V. To disable reset
function, the voltage at reset pin has to be greater than 1V.
6. Time measured from a positive-going input pulse from 0 to 0.4 V
CC
into the threshold to the drop from high to low of the output. Trigger is
tied to threshold.
TYPICAL APPLICATIONS
One feature of the dual timer is that by utilizing both halves it is
possible to obtain sequential timing. By connecting the output of the
first half to the input of the second half via a 0.001µF coupling
capacitor sequential timing may be obtained. Delay t
1
is determined
by the first half and t
2
by the second half delay.
V
CC
V
CC
The first half of the timer is started by momentarily connecting Pin 6
to ground. When it is timed out (determined by 1.1R
1
C
1
) the second
half begins. Its duration is determined by 1.1R
2
C
2
.
V
CC
V
CC
V
CC
R
1
10k
1M
4
1
10
14
12
13
2
.001
INPUT
C
1
1µF
6
7
11
.01
NOTE:
All resistor values are in
Ω.
3
.01
556
8
R
2
130k
10k
C
2
50µF
.001
5
9
OUTPUT 1
OUTPUT 2
Sequential Timer
August 31, 1994
356
PHILIPS [ NXP SEMICONDUCTORS ]
