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NA555DR

更新时间: 2024-01-08 05:14:38
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德州仪器 - TI /
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PRECISION TIMERS

NA555DR 数据手册

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NA555, NE555, SA555, SE555  
PRECISION TIMERS  
www.ti.com  
SLFS022FSEPTEMBER 1973REVISED JUNE 2006  
FEATURES  
Timing From Microseconds to Hours  
Astable or Monostable Operation  
Adjustable Duty Cycle  
TTL-Compatible Output Can Sink or Source  
up to 200 mA  
DESCRIPTION/ORDERING INFORMATION  
These devices are precision timing circuits capable of producing accurate time delays or oscillation. In the  
time-delay or monostable mode of operation, the timed interval is controlled by a single external resistor and  
capacitor network. In the astable mode of operation, the frequency and duty cycle can be controlled  
independently with two external resistors and a single external capacitor.  
The threshold and trigger levels normally are two-thirds and one-third, respectively, of VCC. These levels can be  
altered by use of the control-voltage terminal. When the trigger input falls below the trigger level, the flip-flop is  
set, and the output goes high. If the trigger input is above the trigger level and the threshold input is above the  
threshold level, the flip-flop is reset and the output is low. The reset (RESET) input can override all other inputs  
and can be used to initiate a new timing cycle. When RESET goes low, the flip-flop is reset, and the output goes  
low. When the output is low, a low-impedance path is provided between discharge (DISCH) and ground.  
The output circuit is capable of sinking or sourcing current up to 200 mA. Operation is specified for supplies of  
5 V to 15 V. With a 5-V supply, output levels are compatible with TTL inputs.  
NA555...D OR P PACKAGE  
SE555...FK PACKAGE  
NE555...D, P, PS, OR PW PACKAGE  
(TOP VIEW)  
SA555...D OR P PACKAGE  
SE555...D, JG, OR P PACKAGE  
(TOP VIEW)  
3
2
1 20 19  
18  
1
2
3
4
GND  
TRIG  
OUT  
VCC  
8
7
6
5
NC  
NC  
TRIG  
NC  
OUT  
NC  
4
5
6
7
8
DISCH  
THRES  
CONT  
DISCH  
NC  
THRES  
NC  
17  
16  
15  
14  
RESET  
9 10 11 12 13  
NC – No internal connection  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 1973–2006, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
On products compliant to MIL-PRF-38535, all parameters are  
Instruments standard warranty. Production processing does not  
tested unless otherwise noted. On all other products, production  
necessarily include testing of all parameters.  
processing does not necessarily include testing of all parameters.  

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