Sample & Support & Product Tools & Technical Community Buy Folder Documents Software NA555,NE555,SA555,SE555 SLFS022ISEPTEMBER 1973REVISED SEPTEMBER 2014 xx555 Precision Timers 1 Features 3 Description These devices are precision timing circuits capable of 1 Timing From Microseconds to Hours producing accurate time delays or oscillation. In the Astable or Monostable Operation time-delay or mono-stable mode of operation, the Adjustable Duty Cycle timed interval is controlled by a single external resistor and capacitor network. In the a-stable mode TTL-Compatible Output Can Sink or Source of operation, the frequency and duty cycle can be Up to 200 mA controlled independently with two external resistors On Products Compliant to MIL-PRF-38535, and a single external capacitor. All Parameters Are Tested Unless Otherwise The threshold and trigger levels normally are two- Noted. On All Other Products, Production thirds and one-third, respectively, of V . These CC Processing Does Not Necessarily Include levels can be altered by use of the control-voltage Testing of All Parameters. terminal. When the trigger input falls below the trigger level, the flip-flop is set, and the output goes high. If 2 Applications the trigger input is above the trigger level and the Fingerprint Biometrics threshold input is above the threshold level, the flip- flop is reset and the output is low. The reset (RESET) Iris Biometrics input can override all other inputs and can be used to RFID Reader 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. (1) Device Information PART NUMBER PACKAGE BODY SIZE (NOM) PDIP (8) 9.81 mm 6.35 mm SOP (8) 6.20 mm 5.30 mm xx555 TSSOP (8) 3.00 mm 4.40 mm SOIC (8) 4.90 mm 3.91 mm (1) For all available packages, see the orderable addendum at the end of the datasheet. 4 Simplified Schematic V CC RESET 8 4 CONT 5 R1 6 THRES 3 R OUT 1 S 2 TRIG 7 DISCH 1 GND 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.NA555,NE555,SA555,SE555 SLFS022ISEPTEMBER 1973REVISED SEPTEMBER 2014 www.ti.com Table of Contents 8.1 Overview................................................................... 9 1 Features.................................................................. 1 8.2 Functional Block Diagram......................................... 9 2 Applications........................................................... 1 8.3 Feature Description................................................... 9 3 Description............................................................. 1 8.4 Device Functional Modes........................................ 12 4 Simplified Schematic............................................. 1 9 Applications and Implementation...................... 13 5 Revision History..................................................... 2 9.1 Application Information............................................ 13 6 Pin Configuration and Functions......................... 3 9.2 Typical Applications................................................ 13 7 Specifications......................................................... 4 10 Power Supply Recommendations..................... 18 7.1 Absolute Maximum Ratings ..................................... 4 11 Device and Documentation Support................. 19 7.2 Handling Ratings....................................................... 4 11.1 Related Links........................................................ 19 7.3 Recommended Operating Conditions....................... 4 11.2 Trademarks........................................................... 19 7.4 Electrical Characteristics........................................... 5 11.3 Electrostatic Discharge Caution............................ 19 7.5 Operating Characteristics.......................................... 6 11.4 Glossary................................................................ 19 7.6 Typical Characteristics.............................................. 7 12 Mechanical, Packaging, and Orderable 8 Detailed Description.............................................. 9 Information........................................................... 19 5 Revision History Changes from Revision H (June 2010) to Revision I Page Updated document to new TI enhanced data sheet format................................................................................................... 1 Deleted Ordering Information table..................................................................................................................................... 1 Added Military Disclaimer to Features list.............................................................................................................................. 1 Added Applications................................................................................................................................................................. 1 Added Device Information table............................................................................................................................................. 1 Moved T to Handling Ratings table..................................................................................................................................... 4 stg Added DISCH switch on-state voltage parameter.................................................................................................................. 5 Added Device and Documentation Support section............................................................................................................. 19 Added ESD warning............................................................................................................................................................. 19 Added Mechanical, Packaging, and Orderable Information section..................................................................................... 19 2 Submit Documentation Feedback Copyright 19732014, Texas Instruments Incorporated Product Folder Links: NA555 NE555 SA555 SE555