# SN74LS629D

**Texas Instruments** · Voltage Controlled Oscillators (VCOs) · SOIC-16

SN74LS629D 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 | 2FC | input | Frequency-control voltage input for VCO 2, which sets its output frequency together with the external capacitor. |
| 2 | 1FC | input | Frequency-control voltage input for VCO 1, which sets its output frequency together with the external capacitor. |
| 3 | 1RNG | input | Frequency-range voltage input for VCO 1. |
| 4 | 1CX1 | passive | External timing capacitor or crystal connection 1 for VCO 1. |
| 5 | 1CX2 | passive | External timing capacitor or crystal connection 2 for VCO 1. |
| 6 | 1EN | input | Active-low enable for VCO 1: low enables the output, high disables the oscillator and drives 1Y high. |
| 7 | 1Y | output | Square-wave output of VCO 1 with a duty cycle of approximately 50 percent, high when disabled. |
| 8 | OSC GND | power_in | Ground for the oscillator and frequency-control circuits, separate from the output-section GND. |
| 9 | GND | power_in | Ground for the enable, synchronization-gating and output sections. |
| 10 | 2Y | output | Square-wave output of VCO 2 with a duty cycle of approximately 50 percent, high when disabled. |
| 11 | 2EN | input | Active-low enable for VCO 2: low enables the output, high disables the oscillator and drives 2Y high. |
| 12 | 2CX2 | passive | External timing capacitor or crystal connection 2 for VCO 2. |
| 13 | 2CX1 | passive | External timing capacitor or crystal connection 1 for VCO 2. |
| 14 | 2RNG | input | Frequency-range voltage input for VCO 2. |
| 15 | OSC VCC | power_in | Supply for the oscillator and frequency-control circuits, separate from the output-section VCC. |
| 16 | VCC | power_in | Supply for the enable, synchronization-gating and output sections; a single 5-V supply can power both VCC and OSC VCC. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Crystals, Oscillators, Resonators |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `SN74LS629D`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `sn74ls629d-etched.step` / `sn74ls629d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ls629d.step` / `sn74ls629d.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/sn74ls628) (28 pp, sha256 `742c0c399ac9ea17`, retrieved 2026-10-21, 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/sn74ls629d-datasheet.pdf)