# CD74HC4046AM

**Texas Instruments** · Clock Generators, PLLs, Frequency Synthesizers · SOIC-16

CD74HC4046AM from Texas Instruments, in a SOIC-16. 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 | PCPOUT | output | Phase Comparator Pulse Output; indicates locked condition when HIGH. |
| 2 | PC1OUT | output | Phase Comparator 1 Output from Exclusive-OR logic. |
| 3 | COMPIN | input | Comparator Input common to all three phase comparators. |
| 4 | VCOOUT | output | VCO Output with 50% duty factor. |
| 5 | INH | input | Inhibit Input; LOW enables VCO and demodulator, HIGH disables for low standby power. |
| 6 | C1A | passive | Capacitor C1 Connection A; connect external frequency-setting capacitor between C1A and C1B. |
| 7 | C1B | passive | Capacitor C1 Connection B; connect external frequency-setting capacitor between C1A and C1B. |
| 8 | GND | power_in | Ground (0V reference). |
| 9 | VCOIN | input | VCO Input control voltage; valid operating range 1.1V to VCC-0.9V. |
| 10 | DEMOUT | output | Demodulator Output; high impedance if unused, load with resistor RS greater than 300kΩ if used. |
| 11 | R1 | passive | Resistor R1 Connection; external resistor 3kΩ to 300kΩ from R1 to GND sets VCO frequency range. |
| 12 | R2 | passive | Resistor R2 Connection; external resistor 3kΩ to 300kΩ from R2 to GND provides frequency offset. |
| 13 | PC2OUT | tri_state | Phase Comparator 2 Output from edge-triggered phase and frequency detector; three-state output. |
| 14 | SIGIN | input | Signal Input common to all three phase comparators; DC or AC coupled operation. |
| 15 | PC3OUT | output | Phase Comparator 3 Output from positive edge-triggered RS flip-flop. |
| 16 | VCC | power_in | Positive Supply Voltage; HC types operate from 2V to 6V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Clock/Timing |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `CD74HC4046AM`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `cd74hc4046am-etched.step` / `cd74hc4046am-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cd74hc4046am.step` / `cd74hc4046am.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/cd74hc4046a) (36 pp, sha256 `047ac408a2e3bcfc`, retrieved 2026-09-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/cd74hc4046am-datasheet.pdf)