component
CD74HCT191M
Public Made by Adomby adom
Texas Instruments Counters, Dividers, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+52@@ -0,0 +1,52 @@+# CD74HCT191M++**Texas Instruments** · Counters, Dividers · SOIC-16++CD74HCT191M from Texas Instruments, in a SOIC-16. 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 | B | input | Preset data input B for asynchronous parallel load. |+| 2 | QB | output | Counter output QB. |+| 3 | QA | output | Counter output QA. |+| 4 | CTEN | input | Active-low count enable; counting occurs when CTEN is low and LOAD is high, and it should be changed only when the clock is high. |+| 5 | D/U | input | Down/up control; high counts down, low counts up, and it should be changed only when the clock is high. |+| 6 | QC | output | Counter output QC. |+| 7 | QD | output | Counter output QD. |+| 8 | GND | power_in | Ground. |+| 9 | D | input | Preset data input D for asynchronous parallel load. |+| 10 | C | input | Preset data input C for asynchronous parallel load. |+| 11 | LOAD | input | Active-low asynchronous parallel load input that presets the counter to the number on A-D. |+| 12 | MAX/MIN | output | Goes high and stays high for one clock cycle on counter overflow or underflow, usable for look-ahead carry. |+| 13 | RCO | output | Active-low ripple clock output, normally high, goes low for the low-level portion of the clock pulse when MAX/MIN is high, used for cascading. |+| 14 | CLK | input | Clock input; the counter counts on the low-to-high clock transition. |+| 15 | A | input | Preset data input A for asynchronous parallel load. |+| 16 | VCC | power_in | Supply voltage, 4.5-V to 5.5-V operation for the HCT191. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-16 |+| Category | Logic |+| Pins | 16 |++## CAD (KiCad official)++- Symbol: `CD74HCT191M`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D, STEP)+- 3D model files: `cd74hct191m-etched.step` / `cd74hct191m-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cd74hct191m.step` / `cd74hct191m.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/cd74hc191) (34 pp, sha256 `c9b6587e141f0d79`, retrieved 2026-10-06, tier: lcsc)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (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/cd74hct191m-datasheet.pdf)
page.jsonadded+209@@ -0,0 +1,209 @@+{+ "slug": "cd74hct191m",+ "version": "0.1.0",+ "type": "component",+ "description": "Texas Instruments Counters, Dividers, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "logic",+ "cd74hct191m",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "cd74hct191m.kicad_sym",+ "cd74hct191m.kicad_mod",+ "cd74hct191m.glb",+ "cd74hct191m.step",+ "cd74hct191m.lbr",+ "docs/hero.png",+ "docs/cd74hct191m-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html",+ "cd74hct191m-hero.glb",+ "cd74hct191m-hero.overlay.json"+ ],+ "component": {+ "mpn": "CD74HCT191M",+ "manufacturer": "Texas Instruments",+ "package": "SOIC-16",+ "pin_count": 16,+ "category": "Logic",+ "subcategory": "Counters, Dividers",+ "datasheet": "https://www.ti.com/cn/lit/gpn/cd74hc191",+ "parts": {+ "symbol": "cd74hct191m.kicad_sym",+ "footprint": "cd74hct191m.kicad_mod",+ "model_3d": "cd74hct191m-hero.glb",+ "model_3d_plain": "cd74hct191m.glb",+ "model_3d_step": "cd74hct191m-etched.step",+ "model_3d_step_plain": "cd74hct191m.step",+ "lbr": "cd74hct191m.lbr"+ },+ "distributor_links": {+ "lcsc": 1547988,+ "digikey": "296-9261-5-ND",+ "mouser": "595-CD74HCT191M"+ },+ "distributor_check": {+ "checked_at": "2026-10-06T03:14:24Z",+ "source": "Component Ocean /api/assign-pns",+ "digikey": {+ "pn": "296-9261-5-ND",+ "status": "found",+ "lifecycle": "Active"+ },+ "mouser": {+ "pn": "595-CD74HCT191M",+ "status": "found"+ }+ },+ "pins": [+ {+ "number": "1",+ "name": "B",+ "type": "input",+ "description": "Preset data input B for asynchronous parallel load."+ },+ {+ "number": "2",+ "name": "QB",+ "type": "output",+ "description": "Counter output QB."+ },+ {+ "number": "3",+ "name": "QA",+ "type": "output",+ "description": "Counter output QA."+ },+ {+ "number": "4",+ "name": "CTEN",+ "type": "input",+ "description": "Active-low count enable; counting occurs when CTEN is low and LOAD is high, and it should be changed only when the clock is high."+ },+ {+ "number": "5",+ "name": "D/U",+ "type": "input",+ "description": "Down/up control; high counts down, low counts up, and it should be changed only when the clock is high."+ },+ {+ "number": "6",+ "name": "QC",+ "type": "output",+ "description": "Counter output QC."+ },+ {+ "number": "7",+ "name": "QD",+ "type": "output",+ "description": "Counter output QD."+ },+ {+ "number": "8",+ "name": "GND",+ "type": "power_in",+ "description": "Ground."+ },+ {+ "number": "9",+ "name": "D",+ "type": "input",+ "description": "Preset data input D for asynchronous parallel load."+ },+ {+ "number": "10",+ "name": "C",+ "type": "input",+ "description": "Preset data input C for asynchronous parallel load."+ },+ {+ "number": "11",+ "name": "LOAD",+ "type": "input",+ "description": "Active-low asynchronous parallel load input that presets the counter to the number on A-D."+ },+ {+ "number": "12",+ "name": "MAX/MIN",+ "type": "output",+ "description": "Goes high and stays high for one clock cycle on counter overflow or underflow, usable for look-ahead carry."+ },+ {+ "number": "13",+ "name": "RCO",+ "type": "output",+ "description": "Active-low ripple clock output, normally high, goes low for the low-level portion of the clock pulse when MAX/MIN is high, used for cascading."+ },+ {+ "number": "14",+ "name": "CLK",+ "type": "input",+ "description": "Clock input; the counter counts on the low-to-high clock transition."+ },+ {+ "number": "15",+ "name": "A",+ "type": "input",+ "description": "Preset data input A for asynchronous parallel load."+ },+ {+ "number": "16",+ "name": "VCC",+ "type": "power_in",+ "description": "Supply voltage, 4.5-V to 5.5-V operation for the HCT191."+ }+ ],+ "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": "vision",+ "consensus_model": "claude-opus-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "extractor flagged: Pins 12 and 13 descriptions come from the description text on page 2. Pin positions come from the pa",+ "vision extraction: provenance cannot be text-verified; needs consensus"+ ],+ "pages_sent": 12,+ "cost_usd": 0.1728,+ "at": "2026-10-06T03:14:08"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/cd74hc191",+ "pages": 34,+ "sha256": "c9b6587e141f0d79",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 16,+ "described": 16,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ }+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}