SN74LVC245A

@@ -0,0 +1,64 @@+# SN74LVC245++**Texas Instruments** · Bus transceiver / level translator · TSSOP-20++Eight-bit bidirectional bus transceiver that moves a byte between two buses under a single direction pin (DIR), with a 3-state output-enable (OE) to park the bus. Running from 1.65 to 3.6 V with 5 V-tolerant inputs, it doubles as a one-way level translator from 5 V logic down to 3.3 V, a common use on mixed-voltage boards. The outputs drive real bus loads at speed. A standard octal buffer/translator for parallel buses and port expansion.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | DIR | input | Direction control. When high, signal propagates from A to B; when low, signal propagates from B to A. CMOS input with VIH ≈ 0.65·VCC / VIL ≈ 0.35·VCC. |+| 2 | A1 | bidirectional | Transceiver I/O pin, port A channel 1. Driven when DIR=L and /OE=L; receives when DIR=H. Hi-Z when /OE=H. IOL/IOH up to 24 mA at VCC=3 V. |+| 3 | A2 | bidirectional | Transceiver I/O pin, port A channel 2. Driven when DIR=L and /OE=L; receives when DIR=H. |+| 4 | A3 | bidirectional | Transceiver I/O pin, port A channel 3. Driven when DIR=L and /OE=L; receives when DIR=H. |+| 5 | A4 | bidirectional | Transceiver I/O pin, port A channel 4. Driven when DIR=L and /OE=L; receives when DIR=H. |+| 6 | A5 | bidirectional | Transceiver I/O pin, port A channel 5. Driven when DIR=L and /OE=L; receives when DIR=H. |+| 7 | A6 | bidirectional | Transceiver I/O pin, port A channel 6. Driven when DIR=L and /OE=L; receives when DIR=H. |+| 8 | A7 | bidirectional | Transceiver I/O pin, port A channel 7. Driven when DIR=L and /OE=L; receives when DIR=H. |+| 9 | A8 | bidirectional | Transceiver I/O pin, port A channel 8. Driven when DIR=L and /OE=L; receives when DIR=H. |+| 10 | GND | power_in | Ground reference (0 V) for all internal logic and I/O. |+| 11 | B8 | bidirectional | Transceiver I/O pin, port B channel 8. Driven when DIR=H and /OE=L; receives when DIR=L. |+| 12 | B7 | bidirectional | Transceiver I/O pin, port B channel 7. Driven when DIR=H and /OE=L; receives when DIR=L. |+| 13 | B6 | bidirectional | Transceiver I/O pin, port B channel 6. Driven when DIR=H and /OE=L; receives when DIR=L. |+| 14 | B5 | bidirectional | Transceiver I/O pin, port B channel 5. Driven when DIR=H and /OE=L; receives when DIR=L. |+| 15 | B4 | bidirectional | Transceiver I/O pin, port B channel 4. Driven when DIR=H and /OE=L; receives when DIR=L. |+| 16 | B3 | bidirectional | Transceiver I/O pin, port B channel 3. Driven when DIR=H and /OE=L; receives when DIR=L. |+| 17 | B2 | bidirectional | Transceiver I/O pin, port B channel 2. Driven when DIR=H and /OE=L; receives when DIR=L. |+| 18 | B1 | bidirectional | Transceiver I/O pin, port B channel 1. Driven when DIR=H and /OE=L; receives when DIR=L. |+| 19 | ~{OE} | input | Active-low output enable. When low, the selected direction drivers are active; when high, both A and B port outputs are placed in high-impedance (Hi-Z). |+| 20 | VCC | power_in | Positive supply. Recommended operating range 1.65 V to 3.6 V. Inputs are 5.5 V-tolerant regardless of VCC. Decouple with 0.1 µF close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Octal bus transceiver (3-state) |+| Bits | 8, bidirectional |+| Direction | DIR pin |+| Output enable | OE (active low) |+| Supply | 1.65-3.6 V |+| Input tolerance | 5 V-tolerant |+| Package | TSSOP-20 |++## Ordering variants++- `SN74LVC245APWR (TSSOP-20)`+- `SN74LVC245ADWR (SOIC-20)`+- `SN74LVC245ARGYR (VQFN-20)`++## CAD (KiCad official)++- Symbol: `Logic_LevelTranslator:SN74LVC245APW (KiCad official)`+- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`+- 3D model: TSSOP-20 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/sn74lvc245a.pdf) (35 pp, sha256 `f8c28b30ab2bf1a0`, retrieved 2026-08-17, tier: manufacturer)+- **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/sn74lvc245-datasheet.pdf)

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