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CY74FCT646ATQCT
Public Made by Adomby adom
Texas Instruments Buffers, Drivers, Receivers, Transceivers, SSOP-24-150mil. 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
markdownCY74FCT646ATQCT
Texas Instruments · Buffers, Drivers, Receivers, Transceivers · SSOP-24-150mil
CY74FCT646ATQCT from Texas Instruments, in a SSOP-24-150mil. 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 | CPAB | input | Clock-pulse input that stores A-bus data in the A-to-B register on the low-to-high transition. |
| 2 | SAB | input | Output data-source-select input that selects real-time (low) or stored (high) data for the B bus. |
| 3 | DIR | input | Direction output-enable input that determines which bus receives data when G is low (high = A to B, low = B to A). |
| 4 | A1 | bidirectional | Data register A input / data register B output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 5 | A2 | bidirectional | Data register A input / data register B output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 6 | A3 | bidirectional | Data register A input / data register B output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 7 | A4 | bidirectional | Data register A input / data register B output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 8 | A5 | bidirectional | Data register A input / data register B output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 9 | A6 | bidirectional | Data register A input / data register B output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 10 | A7 | bidirectional | Data register A input / data register B output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 11 | A8 | bidirectional | Data register A input / data register B output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 12 | GND | power_in | Ground pin (0 V reference). |
| 13 | B8 | bidirectional | Data register B input / data register A output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 14 | B7 | bidirectional | Data register B input / data register A output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 15 | B6 | bidirectional | Data register B input / data register A output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 16 | B5 | bidirectional | Data register B input / data register A output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 17 | B4 | bidirectional | Data register B input / data register A output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 18 | B3 | bidirectional | Data register B input / data register A output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 19 | B2 | bidirectional | Data register B input / data register A output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 20 | B1 | bidirectional | Data register B input / data register A output, 3-state, with 64-mA sink and 32-mA source drive for CY74FCT646T. |
| 21 | G | input | Output-enable input; outputs are enabled when low and the device is in isolation mode when high. |
| 22 | SBA | input | Output data-source-select input that selects real-time (low) or stored (high) data for the A bus. |
| 23 | CPBA | input | Clock-pulse input that stores B-bus data in the B-to-A register on the low-to-high transition. |
| 24 | VCC | power_in | Supply voltage, 4.75 V to 5.25 V recommended for CY74FCT646T. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-24-150mil |
| Category | Logic |
| Pins | 24 |
CAD (KiCad official)
- Symbol:
CY74FCT646ATQCT - Footprint:
Package_SO:SSOP-24_5.3x8.2mm_P0.65mm - 3D model: SSOP-24-150mil (KiCad packages3D, STEP)
- 3D model files:
cy74fct646atqct-etched.step/cy74fct646atqct-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cy74fct646atqct.step/cy74fct646atqct.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (15 pp, sha256
13b3f72899297c10, retrieved 2026-10-01, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(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).