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SN74LS645-1DWR
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Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+56@@ -0,0 +1,56 @@+# SN74LS645-1DWR++**Texas Instruments** · Buffers, Drivers, Receivers, Transceivers · SOIC-20-300mil++SN74LS645-1DWR from Texas Instruments, in a SOIC-20-300mil. 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 | DIR | input | Direction control input: high transmits A data to the B bus, low transmits B data to the A bus. |+| 2 | A1 | bidirectional | A-bus data I/O 1 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 3 | A2 | bidirectional | A-bus data I/O 2 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 4 | A3 | bidirectional | A-bus data I/O 3 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 5 | A4 | bidirectional | A-bus data I/O 4 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 6 | A5 | bidirectional | A-bus data I/O 5 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 7 | A6 | bidirectional | A-bus data I/O 6 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 8 | A7 | bidirectional | A-bus data I/O 7 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 9 | A8 | bidirectional | A-bus data I/O 8 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 10 | GND | power_in | Ground. |+| 11 | B8 | bidirectional | B-bus data I/O 8 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 12 | B7 | bidirectional | B-bus data I/O 7 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 13 | B6 | bidirectional | B-bus data I/O 6 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 14 | B5 | bidirectional | B-bus data I/O 5 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 15 | B4 | bidirectional | B-bus data I/O 4 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 16 | B3 | bidirectional | B-bus data I/O 3 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 17 | B2 | bidirectional | B-bus data I/O 2 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 18 | B1 | bidirectional | B-bus data I/O 1 with 3-state output and hysteresis at the input; true (non-inverting) transceiver. |+| 19 | G | input | Active-low enable input; when high the device is disabled and the buses are isolated. |+| 20 | VCC | power_in | Positive supply voltage. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-20-300mil |+| Category | Logic |+| Pins | 20 |++## CAD (KiCad official)++- Symbol: `SN74LS645-1DWR`+- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`+- 3D model: SOIC-20-300mil (KiCad packages3D, STEP)+- 3D model files: `sn74ls645-1dwr-etched.step` / `sn74ls645-1dwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ls645-1dwr.step` / `sn74ls645-1dwr.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/sn74ls641) (23 pp, sha256 `d6b51fcf6ad079e0`, retrieved 2026-10-07, tier: lcsc)+- **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](docs/sn74ls645-1dwr-datasheet.pdf)
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true (non-inverting) transceiver."+ },+ {+ "number": "3",+ "name": "A2",+ "type": "bidirectional",+ "description": "A-bus data I/O 2 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "4",+ "name": "A3",+ "type": "bidirectional",+ "description": "A-bus data I/O 3 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "5",+ "name": "A4",+ "type": "bidirectional",+ "description": "A-bus data I/O 4 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "6",+ "name": "A5",+ "type": "bidirectional",+ "description": "A-bus data I/O 5 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "7",+ "name": "A6",+ "type": "bidirectional",+ "description": "A-bus data I/O 6 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "8",+ "name": "A7",+ "type": "bidirectional",+ "description": "A-bus data I/O 7 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "9",+ "name": "A8",+ "type": "bidirectional",+ "description": "A-bus data I/O 8 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "10",+ "name": "GND",+ "type": "power_in",+ "description": "Ground."+ },+ {+ "number": "11",+ "name": "B8",+ "type": "bidirectional",+ "description": "B-bus data I/O 8 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "12",+ "name": "B7",+ "type": "bidirectional",+ "description": "B-bus data I/O 7 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "13",+ "name": "B6",+ "type": "bidirectional",+ "description": "B-bus data I/O 6 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "14",+ "name": "B5",+ "type": "bidirectional",+ "description": "B-bus data I/O 5 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "15",+ "name": "B4",+ "type": "bidirectional",+ "description": "B-bus data I/O 4 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "16",+ "name": "B3",+ "type": "bidirectional",+ "description": "B-bus data I/O 3 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "17",+ "name": "B2",+ "type": "bidirectional",+ "description": "B-bus data I/O 2 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "18",+ "name": "B1",+ "type": "bidirectional",+ "description": "B-bus data I/O 1 with 3-state output and hysteresis at the input; true (non-inverting) transceiver."+ },+ {+ "number": "19",+ "name": "G",+ "type": "input",+ "description": "Active-low enable input; when high the device is disabled and the buses are isolated."+ },+ {+ "number": "20",+ "name": "VCC",+ "type": "power_in",+ "description": "Positive supply voltage."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.3",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.3",+ "primary_model": "claude-sonnet-5-5",+ "primary_mode": "text+vision",+ "consensus_model": "claude-opus-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "extractor flagged: Package DW (SOIC-20, MS-013 7.5 mm body) matches the SOIC-20-300mil hint. The pinout comes from the ",+ "vision extraction: provenance cannot be text-verified; needs consensus"+ ],+ "pages_sent": 23,+ "cost_usd": 0.4408,+ "at": "2026-10-07T23:57:46"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/sn74ls641",+ "pages": 23,+ "sha256": "d6b51fcf6ad079e0",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 20,+ "described": 20,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ },+ "models_3d": [+ {+ "file": "sn74ls645-1dwr.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 10.3,+ 12.8,+ 2.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "59a10b341e6972b31d81802a048060326da627d8b92dcf4263064f4f62ec808e",+ "checked": "2026-10-07",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "sn74ls645-1dwr-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 10.3,+ 12.8,+ 2.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "9e5194975d68735ff479b17df6ccf291d1aba728955d13b6d2ae5f0bd10e7927",+ "checked": "2026-10-07",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}