# SN74LS624DR

**Texas Instruments** · Voltage Controlled Oscillators (VCOs) · SOIC-14

SN74LS624DR from Texas Instruments, in a SOIC-14. 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 | OSC GND | power_in | Oscillator ground, separate from the output-section GND so the oscillator and frequency-control circuits can be isolated in the system. |
| 2 | RNG | input | Voltage-sensitive frequency range input that, with the external capacitor or crystal, sets the VCO output frequency range. |
| 3 | CX1 | passive | External timing capacitor or crystal connection (terminal 1) that, with the voltage-sensitive inputs, establishes the output frequency. |
| 4 | CX2 | passive | External timing capacitor or crystal connection (terminal 2) that, with the voltage-sensitive inputs, establishes the output frequency. |
| 5 | EN | input | Active-low enable input: low enables the output, high disables the internal oscillator with Y high and Z low. |
| 6 | Y | output | VCO square-wave output with approximately 50 percent duty cycle, held high when EN is high. |
| 7 | GND | power_in | Ground for the enable, synchronization-gating and output sections. |
| 8 | Z | output | Complementary VCO output to Y, held low when EN is high. |
| 9 | VCC | power_in | Supply voltage for the enable, synchronization-gating and output sections (single 5-volt supply can be used). |
| 10 | NC | unconnected | No internal connection. |
| 11 | NC | unconnected | No internal connection. |
| 12 | NC | unconnected | No internal connection. |
| 13 | FREQ CONT | input | Voltage-sensitive frequency control input that sets the VCO output frequency. |
| 14 | OSC VCC | power_in | Oscillator supply, separate from VCC; two independent supplies are recommended for operation above 10 MHz. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-14 |
| Category | Crystals, Oscillators, Resonators |
| Pins | 14 |

## CAD (KiCad official)

- Symbol: `SN74LS624DR`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `sn74ls624dr-etched.step` / `sn74ls624dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ls624dr.step` / `sn74ls624dr.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/lit/ds/symlink/sn74ls624.pdf) (28 pp, sha256 `742c0c399ac9ea17`, retrieved 2026-10-11, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+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/sn74ls624dr-datasheet.pdf)