NE555

NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED 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 NE555...D, P, PS, OR PW PACKAGE SA555...D OR P PACKAGE SE555...D, JG, OR P PACKAGE (TOP VIEW) SE555...FK PACKAGE (TOP VIEW) GND TRIG OUT RESET 1 2 3 4 8 7 6 5 VCC DISCH THRES CONT NC GND NC VCC NC NC TRIG NC OUT NC 4 5 6 7 8 3 2 1 20 19 18 17 16 15 14 9 10 11 12 13 NC DISCH NC THRES NC 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. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. NC RESET NC CONT NC Copyright © 1973–2006, Texas Instruments Incorporated On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted. On all other products, production processing does not necessarily include testing of all parameters. NA555, NE555, SA555, SE555 PRECISION TIMERS SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 www.ti.com ORDERING INFORMATION TA VTHRES MAX VCC = 15 V PDIP – P SOIC – D 0°C to 70°C 11.2 V SOP – PS TSSOP – PW PDIP – P –40°C to 85°C 11.2 V SOIC – D PDIP – P –40°C to 105°C 11.2 V SOIC – D PDIP – P –55°C to 125°C 10.6 SOIC – D CDIP – JG LCCC – FK (1) PACKAGE (1) Tube of 50 Tube of 75 Reel of 2500 Reel of 2000 Tube of 150 Reel of 2000 Tube of 50 Tube of 75 Reel of 2000 Tube of 50 Tube of 75 Reel of 2000 Tube of 50 Tube of 75 Reel of 2500 Tube of 50 Tube of 55 ORDERABLE PART NUMBER NE555P NE555D NE555DR NE555PSR NE555PW NE555PWR SA555P SA555D SA555DR NA555P NA555D NA555DR SE555P SE555D SE555DR SE555JG SE555FK TOP-SIDE MARKING NE555P NE555 N555 N555 SA555P SA555 NA555P NA555 SE555P SE555D SE555JG SE555FK Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. FUNCTION TABLE RESET Low High High High (1) TRIGGER VOLTAGE (1) Irrelevant 1/3 VDD >1/3 VDD THRESHOLD VOLTAGE (1) Irrelevant Irrelevant >2/3 VDD