# CY74FCT2245ATPWR

**Texas Instruments** · Buffers, Drivers, Receivers, Transceivers · TSSOP-20

CY74FCT2245ATPWR from Texas Instruments, in a TSSOP-20. 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 | T/R | input | Transmit/receive direction input: high sends data from A ports to B ports, low sends data from B ports to A ports. |
| 2 | A0 | bidirectional | A-port data I/O bit 0 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 3 | A1 | bidirectional | A-port data I/O bit 1 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 4 | A2 | bidirectional | A-port data I/O bit 2 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 5 | A3 | bidirectional | A-port data I/O bit 3 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 6 | A4 | bidirectional | A-port data I/O bit 4 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 7 | A5 | bidirectional | A-port data I/O bit 5 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 8 | A6 | bidirectional | A-port data I/O bit 6 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 9 | A7 | bidirectional | A-port data I/O bit 7 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 10 | GND | power_in | Ground. |
| 11 | B7 | bidirectional | B-port data I/O bit 7 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 12 | B6 | bidirectional | B-port data I/O bit 6 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 13 | B5 | bidirectional | B-port data I/O bit 5 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 14 | B4 | bidirectional | B-port data I/O bit 4 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 15 | B3 | bidirectional | B-port data I/O bit 3 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 16 | B2 | bidirectional | B-port data I/O bit 2 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 17 | B1 | bidirectional | B-port data I/O bit 1 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 18 | B0 | bidirectional | B-port data I/O bit 0 with 3-state output, 25-Ω series resistor, 12 mA sink and 15 mA source capability. |
| 19 | OE | input | Output enable, when high it puts both A and B ports in the high-impedance state. |
| 20 | VCC | power_in | Supply voltage, 4.75 V to 5.25 V recommended (5 V nominal). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-20 |
| Category | Logic |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `CY74FCT2245ATPWR`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `cy74fct2245atpwr-etched.step` / `cy74fct2245atpwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cy74fct2245atpwr.step` / `cy74fct2245atpwr.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/cy74fct2245t) (19 pp, sha256 `3c88567fc5d3951a`, retrieved 2026-10-10, tier: lcsc)
- **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/cy74fct2245atpwr-datasheet.pdf)