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NA556

Part Number	NA556
Manufacturer	Texas Instruments
Description	DUAL PRECISION TIMERS
Published	Apr 14, 2020
Detailed Description	www.ti.com FEATURES • Two Precision Timing Circuits Per Package • Astable or Monostable Operation • TTL-Compatible Outpu...
Datasheet	NA556 PDF File

Overview

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 NA556, NE556, SA556, SE556 DUAL PRECISION TIMERS SLFS023G – APRIL 1978 – REVISED JUNE 2006 NA556.
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D OR N PACKAGE NE556.
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D, N, OR NS PACKAGE SA556.
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D OR N PACKAGE SE556.
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J PACKAGE (TOP VIEW) 1DISCH 1THRES 1CONT 1RESET 1OUT 1TRIG GND 1 2 3 4 5 6 7 14 VCC 13 2DISCH 12 2THRES 11 2CONT 10 2RESET 9 2OUT 8 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).
Ple...

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