component
CDC421A250RGER
Public Made by Adomby adom
Texas Instruments Clock Generators, PLLs, Frequency Synthesizers, VQFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownCDC421A250RGER
Texas Instruments · Clock Generators, PLLs, Frequency Synthesizers · VQFN-24-EP(4x4)
CDC421A250RGER from Texas Instruments, in a VQFN-24-EP(4x4). 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 | CE | input | Chip enable LVCMOS input: CE = 1 enables the device and outputs; CE = 0 disables all current sources so LVPECL outputs are Hi-Z. |
| 2 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 3 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 4 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 5 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 6 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 7 | OUTN | output | High-speed negative differential LVPECL output, enabled by the CE pin. |
| 8 | GND | power_in | Ground. |
| 9 | GND | power_in | Ground. |
| 10 | OUTP | output | High-speed positive differential LVPECL output, enabled by the CE pin. |
| 11 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 12 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 13 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 14 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 15 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 16 | VCC | power_in | 3.3-V power supply; recommended operating range 3.0 V to 3.6 V. |
| 17 | VCC | power_in | 3.3-V power supply; recommended operating range 3.0 V to 3.6 V. |
| 18 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 19 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 20 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 21 | XIN1 | input | In crystal mode, connect to one end of the crystal (XIN2 to the other end); in LVCMOS single-ended driven mode, this pin is the input reference. |
| 22 | XIN2 | input | In crystal mode, connect to the other end of the crystal; in LVCMOS single-ended driven mode, connect to GND. |
| 23 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 24 | NC | unconnected | TI test pin; do not connect, leave floating. |
| 25 | Thermal pad | passive | Exposed thermal pad on the package bottom; must be soldered to the PCB for thermal and mechanical performance. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-24-EP(4x4) |
| Category | Clock/Timing |
| Pins | 25 |
CAD (KiCad official)
- Symbol:
CDC421A250RGER - Footprint:
Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm - 3D model: VQFN-24-EP(4x4) (KiCad packages3D, STEP)
- 3D model files:
cdc421a250rger-etched.step/cdc421a250rger-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cdc421a250rger.step/cdc421a250rger.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (17 pp, sha256
915ca5742046cc8c, retrieved 2026-10-08, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-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).