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NA556DR

Public Made by Adom

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Texas Instruments Timers / Clock Oscillators, SOIC-14. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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NA556DR

Texas Instruments · Timers / Clock Oscillators · SOIC-14

NA556DR from Texas Instruments, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 1DISCH output Timer 1 discharge pin. Open-collector output used to discharge the external timing capacitor C_T when the timer output is low.
2 1THRES input Timer 1 threshold input. End-of-timing input; when THRES > CONT (nominally 2/3 Vcc) the output goes low and the discharge transistor turns on.
3 1CONT input Timer 1 control voltage. Sets the comparator thresholds (nominally 2/3 Vcc); can be tied to a bypass capacitor for noise immunity or driven to modulate the timing.
4 1RESET input Timer 1 active-low reset input. Overrides all other inputs; forces output and discharge low. Tie to Vcc when unused. V_RESET typ 0.7 V, max 1 V.
5 1OUT output Timer 1 output. High-current TTL-compatible timer output; can sink or source up to 200 mA.
6 1TRIG input Timer 1 trigger input. Start-of-timing input; when TRIG < 1/2 CONT (nominally 1/3 Vcc) the output goes high and the discharge transistor turns off.
7 GND power_in Ground / device negative supply reference.
8 2TRIG input Timer 2 trigger input. Start-of-timing input; when TRIG < 1/2 CONT (nominally 1/3 Vcc) the output goes high and the discharge transistor turns off.
9 2OUT output Timer 2 output. High-current TTL-compatible timer output; can sink or source up to 200 mA.
10 2RESET input Timer 2 active-low reset input. Overrides all other inputs; forces output and discharge low. Tie to Vcc when unused.
11 2CONT input Timer 2 control voltage. Sets the comparator thresholds (nominally 2/3 Vcc); can be tied to a bypass capacitor for noise immunity or driven to modulate the timing.
12 2THRES input Timer 2 threshold input. End-of-timing input; when THRES > CONT (nominally 2/3 Vcc) the output goes low and the discharge transistor turns on.
13 2DISCH output Timer 2 discharge pin. Open-collector output used to discharge the external timing capacitor C_T when the timer output is low.
14 VCC power_in Positive supply voltage. Recommended 4.5 V to 16 V (NA556/NE556/SA556); absolute maximum 18 V. Bypass to GND with a local ceramic capacitor.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-14
Category RTC
Pins 14

Ordering variants

Same part, different packaging or reel option.

  • NA556DR
  • NA556DRD
  • NA556DRN

CAD (KiCad official)

  • Symbol: NA556DR
  • Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
  • 3D model: SOIC-14 (KiCad packages3D, STEP)
  • 3D model files: na556dr-etched.step / na556dr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); na556dr.step / na556dr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (31 pp, sha256 63e3e49f1c2acba3, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF