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SN74LS90DR

Public Made by Adom

by adom

Texas Instruments Counters, Dividers, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74LS90DR

Texas Instruments · Counters, Dividers · SOIC-14

SN74LS90DR from Texas Instruments, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 CKB input Clock input B for the divide-by-five section, advancing on the high-to-low transition; connect to QA for full decade count.
2 R0(1) input Gated zero-reset input 1; with R0(2) both high resets the counter to zero.
3 R0(2) input Gated zero-reset input 2; with R0(1) both high resets the counter to zero.
4 NC unconnected No internal connection.
5 VCC power_in Positive supply voltage.
6 R9(1) input Gated set-to-nine input 1; with R9(2) both high sets the outputs to BCD nine.
7 R9(2) input Gated set-to-nine input 2; with R9(1) both high sets the outputs to BCD nine.
8 QC output Counter output C of the divide-by-five section.
9 QB output Counter output B of the divide-by-five section.
10 GND power_in Ground.
11 QD output Counter output D, the most significant bit of the divide-by-five section.
12 QA output Counter output A of the divide-by-two section.
13 NC unconnected No internal connection.
14 CKA input Clock input A for the divide-by-two section, advancing on the high-to-low transition; count pulses are applied here.

Key specifications

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

CAD (KiCad official)

  • Symbol: SN74LS90DR
  • Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
  • 3D model: SOIC-14 (KiCad packages3D, STEP)
  • 3D model files: sn74ls90dr-etched.step / sn74ls90dr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ls90dr.step / sn74ls90dr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (27 pp, sha256 43d2e13b0f0e6ce2, retrieved 2026-10-08, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF