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NE556 Datasheet(PDF) 4 Page - NXP Semiconductors

Part No. NE556
Description  Dual timer
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 4 page
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Philips Semiconductors Linear Products
Product specification
NE/SA/SE556/NE556-1
Dual timer
August 31, 1994
356
ELECTRICAL CHARACTERISTICS (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
SE556/556-1
NE/SA556/SE556C
NE556-1/SE556-1C
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
Min
Typ
Max
Min
Typ
Max
UNIT
Matching characteristics4
Initial accuracy2
0.5
1.0
1.0
2.0
%
Drift with temperature
10
±10
ppm/
°C
Drift with supply voltage
0.1
0.2
0.2
0.5
%/V
NOTES:
1. Supply current when output is high is typically 1.0mA less.
2. Tested at VCC=5V and VCC=15V.
3. This will determine maximum value of RA+RB. For 15V operation, the max total R=10MΩ, and for 5V operation, the maximum total
R=3.4M
Ω.
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 VCC 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 0.001
µF coupling
capacitor sequential timing may be obtained. Delay t1 is determined
by the first half and t2 by the second half delay.
The first half of the timer is started by momentarily connecting Pin 6
to ground. When it is timed out (determined by 1.1R1C1) the second
half begins. Its duration is determined by 1.1R2C2.
Sequential Timer
All resistor values are in
Ω.
NOTE:
VCC
VCC
VCC
VCC
VCC
INPUT
OUTPUT 1
OUTPUT 2
50
µF
10k
1M
1
2
6
7
11
3
9
5
8
13
12
14
10
4
556
.01
.001
C1
C2
R2
R1
.001
.01
1
µF
10k
130k




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