74HC164PW

@@ -0,0 +1,55 @@+# 74HC164PW++**Nexperia** · Shifting Register · TSSOP-14++74HC164PW from Nexperia, in a TSSOP-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 | DSA | input | Gated serial data input A. AND-combined with DSB to feed the first flip-flop; either input can serve as an active-HIGH enable for the other. Data must meet set-up/hold before the LOW-to-HIGH CP transition. |+| 2 | DSB | input | Gated serial data input B. AND-combined with DSA to feed the first flip-flop; either input can serve as an active-HIGH enable for the other. |+| 3 | Q0 | output | Parallel data output, bit 0 (first stage of the shift register). CMOS push-pull output. |+| 4 | Q1 | output | Parallel data output, bit 1. CMOS push-pull output. |+| 5 | Q2 | output | Parallel data output, bit 2. CMOS push-pull output. |+| 6 | Q3 | output | Parallel data output, bit 3. CMOS push-pull output. |+| 7 | GND | power_in | Ground reference (0 V). |+| 8 | CP | input | Clock input. Data is shifted on the LOW-to-HIGH edge (edge-triggered). Maximum frequency typically 78 MHz at Vcc=5 V. |+| 9 | MR | input | Master reset input, active LOW. Asynchronously clears the register and forces all Q outputs LOW, independent of CP. |+| 10 | Q4 | output | Parallel data output, bit 4. CMOS push-pull output. |+| 11 | Q5 | output | Parallel data output, bit 5. CMOS push-pull output. |+| 12 | Q6 | output | Parallel data output, bit 6. CMOS push-pull output. |+| 13 | Q7 | output | Parallel data output, bit 7 (last stage of the shift register). CMOS push-pull output. |+| 14 | VCC | power_in | Positive supply voltage. 74HC164: 2.0 to 6.0 V (recommended). 74HCT164: 4.5 to 5.5 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Nexperia |+| Package | TSSOP-14 |+| Category | Logic |+| Pins | 14 |++## Ordering variants++- `74HC164PWPW`+- `74HC164PWD`+- `74HC164PWBQ`++## CAD (KiCad official)++- Symbol: `74HC164PW`+- Footprint: `Package_SO:TSSOP-14_4.4x5mm_P0.65mm`+- 3D model: TSSOP-14 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/74HC164PW.pdf) (16 pp, sha256 `aa299aaeb852d99f`, 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](docs/74hc164pw-datasheet.pdf)

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