component
SN74LS90DR
Public Made by Adomby adom
Texas Instruments Counters, Dividers, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSN74LS90DR
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74ls90dr.step/sn74ls90dr.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).