NA556DRG4

NA556, NE556, SA556, SE556 DUAL PRECISION TIMERS www.ti.com FEATURES • • • • • Two Precision Timing Circuits Per Package Astable or Monostable Operation TTL-Compatible Output Can Sink or Source up to 150 mA Active Pullup or Pulldown Designed to Be Interchangeable With Signetics NE556, SA556, and SE556 APPLICATIONS • • • • • • • • • • • • Precision Timers From Microseconds to Hours Pulse-Shaping Circuits Missing-Pulse Detectors Tone-Burst Generators Pulse-Width Modulators Pulse-Position Modulators Sequential Timers Pulse Generators Frequency Dividers Application Timers Industrial Controls Touch-Tone Encoders SLFS023G – APRIL 1978 – REVISED JUNE 2006 NA556...D OR N PACKAGE NE556...D, N, OR NS PACKAGE SA556...D OR N PACKAGE SE556...J PACKAGE (TOP VIEW) 1DISCH 1THRES 1CONT 1RESET 1OUT 1TRIG GND 1 14 2 13 3 12 4 11 5 10 6 7 9 8 VCC 2DISCH 2THRES 2CONT 2RESET 2OUT 2TRIG DESCRIPTION/ORDERING INFORMATION These devices provide two independent timing circuits of the NA555, NE555, SA555, or SE555 type in each package. These circuits can be operated in the astable or the monostable mode with external resistor-capacitor (RC) timing control. The basic timing provided by the RC time constant can be controlled actively by modulating the bias of the control-voltage input. The threshold (THRES) and trigger (TRIG) levels normally are two-thirds and one-third, respectively, of VCC. These levels can be altered by using the control voltage (CONT) terminal. When the trigger input falls below 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 the discharge (DISCH) terminal and ground (GND). 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. Copyright © 1978–2006, 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. NA556, NE556, SA556, SE556 DUAL PRECISION TIMERS www.ti.com SLFS023G – APRIL 1978 – REVISED JUNE 2006 ORDERING INFORMATION TA VT (MAX) VCC = 15 V PACKAGE (1) PDIP – N 0°C to 70°C 11.2 V –40°C to 85°C 11.2 V –40°C to 105°C –55°C to 125°C (1) NE556N Tube of 50 NE556D Reel of 2500 NE556DR SOP – NS Reel of 2000 NE556NSR NE556 PDIP – N Tube of 25 SA556N SA556N PDIP – N Tube of 25 NA556N NA556N Tube of 50 NA556D Reel of 2500 NA556DR SOIC – D 10.6 V CDIP – J Tube of 25 NE556N NE556 NA556 SE556J SE556J SE556JB SE556JB Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. FUNCTION TABLE (each timer) RESET TRIGGER VOLTAGE (1) THRESHOLD VOLTAGE (1) OUTPUT DISCHARGE SWITCH Low Irrelevant Irrelevant Low On High 1/3 VDD >2/3 VDD Low On High >1/3 VDD