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NE555 Datasheet(PDF) 16 Page - Texas Instruments

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Part No. NE555
Description  xx555 Precision Timers
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

NE555 Datasheet(HTML) 16 Page - Texas Instruments

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RB
Modulation
Input
(see Note A)
CONT
TRIG
RESET
VCC
OUT
DISCH
VCC (5 V to 15 V)
RL
RA
C
GND
THRES
NOTE A: The modulating signal can be direct or capacitively coupled
to CONT. For direct coupling, the effects of modulation
source voltage and impedance on the bias of the timer
should be considered.
Pin numbers shown are for the D, JG, P, PS, and PW packages.
4
8
3
7
6
2
5
Output
NA555, NE555, SA555, SE555
SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014
www.ti.com
Typical Applications (continued)
Figure 20. Circuit for Pulse-Position Modulation
9.2.3.1 Design Requirements
Both DC and AC coupled modulation input will change the upper and lower voltage thresholds for the timing
capacitor. Both frequency and duty cycle will vary with the modulation voltage.
9.2.3.2 Detailed Design Procedure
The nominal output frequency and duty cycle can be determined using formulas in A-stable Operation section. RL
improves VOH, but it is not required for TTL compatibility.
16
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Copyright © 1973–2014, Texas Instruments Incorporated
Product Folder Links: NA555 NE555 SA555 SE555


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