74HC164D

@@ -0,0 +1,57 @@+# 74HC164D++**Shenzhen Fuman Elec** · Shifting Register · SOP-14++74HC164D from Shenzhen Fuman Elec, in a SOP-14. Pinout and pin descriptions extracted from the datasheet (via LCSC) by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | A | input | Gated serial data input A. ANDed with input B to feed the first flip-flop; a low on either A or B inhibits new data entry and forces the first stage low on the next CLK rising edge. |+| 2 | B | input | Gated serial data input B. ANDed with input A; must be high to permit A to control the first flip-flop. |+| 3 | QA | output | Shift register stage 1 parallel output. Updated on the rising edge of CLK. |+| 4 | QB | output | Shift register stage 2 parallel output. |+| 5 | QC | output | Shift register stage 3 parallel output. |+| 6 | QD | output | Shift register stage 4 parallel output. |+| 7 | GND | power_in | Ground reference. 0 V return for VDD. |+| 8 | CLOCK | input | Shift clock input. Data at A/B is captured on the low-to-high transition of CLK; fmax up to ~25 MHz at VCC=4.5 V (74HC). |+| 9 | CLEAR | input | Asynchronous active-low master clear. When low, all Q outputs are forced low independent of CLK. |+| 10 | QE | output | Shift register stage 5 parallel output. |+| 11 | QF | output | Shift register stage 6 parallel output. |+| 12 | QG | output | Shift register stage 7 parallel output. |+| 13 | QH | output | Shift register stage 8 (final) parallel output. Typically used as the serial-out to cascade additional 74HC164 devices. |+| 14 | VDD | power_in | Positive supply voltage. Recommended 2 V to 6 V (nominal 5 V); absolute max 7 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Shenzhen Fuman Elec |+| Package | SOP-14 |+| Category | Logic |+| Pins | 14 |++## Ordering variants++- `74HC164DD`+- `74HC164DN`+- `74HC164DJ`+- `74HC164DW`+- `74HC164DFK`++## CAD (KiCad official)++- Symbol: `74HC164D`+- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`+- 3D model: SOP-14 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Shenzhen Fuman Elec datasheet](https://datasheet.lcsc.com/datasheet/pdf/1f1a19c1f2ab4197a93e06c9daef5982.pdf) (7 pp, sha256 `eb798fbe5be69ee3`, retrieved 2026-08-17, tier: lcsc)+- **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/74hc164d-datasheet.pdf)

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