SE556| Datasheet

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NA556, NE556, SA556, SE556 DUAL PRECISION TIMERS
www.ti.com
SLFS023G APRIL 1978 REVISED JUNE 2006

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

NA556...D OR N PACKAGE NE556...D, N, OR NS PACKAGE SA556...D OR N PACKAGE SE556...J PACKAGE (TOP VIEW)

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

1DISCH 1THRES 1CONT 1RESET 1OUT 1TRIG GND

1 2 3 4 5 6 7

14 13 12 11 10 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.