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CY74FCT646ATSOCT

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Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOIC-24-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentlogiccy74fct646atsoctfactory-2.0.0extractor-text

Verified CY74FCT646ATSOCT

by Ray · last 5 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

5 Nov 2026RayPublished by the parts factory: tier mfr, 24 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: CY74FCT646ATSOCT · SOIC-24-300mil · 24 pins
  • ✓copper: 24 copper pads, none touching another net
  • ✓datasheet: all 24 pin names found in the 15-page datasheet
  • ✓distributor: lcsc C2878410, digikey 296-23217-2-ND, mouser 595-CY74FCT646ATSOCT
  • ✓family: SOIC-24W_7.5x15.4mm_P1.27mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-s650m3k5/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 24 pins = 24 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 24 pins agree
  • ✓symbol_text: no pin names collide
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ cy74fct646atsoct.kicad_sym✓ cy74fct646atsoct.kicad_mod✓ cy74fct646atsoct.step
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Contents

README

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CY74FCT646ATSOCT

Texas Instruments · Buffers, Drivers, Receivers, Transceivers · SOIC-24-300mil

CY74FCT646ATSOCT from Texas Instruments, in a SOIC-24-300mil. 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 for the A-to-B register; data on the bus is stored on each low-to-high transition.
2 SAB input Output data-source-select input that multiplexes stored and real-time data for the A-to-B path.
3 DIR input Direction input that determines which bus receives data when G is low.
4 A1 bidirectional Data register A input and data register B output for bus A, bit 1.
5 A2 bidirectional Data register A input and data register B output for bus A, bit 2.
6 A3 bidirectional Data register A input and data register B output for bus A, bit 3.
7 A4 bidirectional Data register A input and data register B output for bus A, bit 4.
8 A5 bidirectional Data register A input and data register B output for bus A, bit 5.
9 A6 bidirectional Data register A input and data register B output for bus A, bit 6.
10 A7 bidirectional Data register A input and data register B output for bus A, bit 7.
11 A8 bidirectional Data register A input and data register B output for bus A, bit 8.
12 GND power_in Ground reference for the device.
13 B8 bidirectional Data register B input and data register A output for bus B, bit 8.
14 B7 bidirectional Data register B input and data register A output for bus B, bit 7.
15 B6 bidirectional Data register B input and data register A output for bus B, bit 6.
16 B5 bidirectional Data register B input and data register A output for bus B, bit 5.
17 B4 bidirectional Data register B input and data register A output for bus B, bit 4.
18 B3 bidirectional Data register B input and data register A output for bus B, bit 3.
19 B2 bidirectional Data register B input and data register A output for bus B, bit 2.
20 B1 bidirectional Data register B input and data register A output for bus B, bit 1.
21 G input Output-enable input; when high the device is in isolation mode and the data outputs are disabled.
22 SBA input Output data-source-select input that multiplexes stored and real-time data for the B-to-A path.
23 CPBA input Clock-pulse input for the B-to-A register; data on the bus is stored on each low-to-high transition.
24 VCC power_in Supply voltage; 4.75 V to 5.25 V is recommended for the CY74FCT646T.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-24-300mil
Category Logic
Pins 24

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Supply voltage VCC 4.75 5 5.25 V 5
High-level input voltage VIH 2 V 5
Low-level input voltage VIL 0.8 V 5
High-level output current IOH -32 mA 5
Low-level output current IOL 64 mA 5
Operating free-air temperature TA -40 85 °C 5
Supply voltage range to ground potential -0.5 7 V 4
DC input voltage range -0.5 7 V 4
DC output voltage range -0.5 7 V 4
DC output current (maximum sink current/pin) 120 mA maximum sink current/pin 4
Ambient temperature range with power applied TA -65 135 °C with power applied 4
Storage temperature range Tstg -65 150 °C 4
Input clamp voltage VIK -0.7 -1.2 V VCC = 4.75 V, IIN = -18 mA 6
High-level output voltage VOH 2.4 3.3 V VCC = 4.75 V, IOH = -15 mA 6
High-level output voltage VOH 2 V VCC = 4.75 V, IOH = -32 mA 6
Low-level output voltage VOL 0.3 0.55 V VCC = 4.75 V, IOL = 64 mA 6
Input hysteresis Vhys 0.2 V All inputs 6
Input current II 5 µA VCC = 5.25 V, VIN = VCC 6
High-level input current IIH -1 1 µA VCC = 5.25 V, VIN = 2.7 V 6
Low-level input current IIL -1 1 µA VCC = 5.25 V, VIN = 0.5 V 6
Off-state output current, high-level voltage applied IOZH 10 µA VCC = 5.25 V, VOUT = 2.7 V 6
Off-state output current, low-level voltage applied IOZL -10 µA VCC = 5.25 V, VOUT = 0.5 V 6
Short-circuit output current IOS -60 -120 -225 mA VCC = 5.25 V, VOUT = 0 V 6
Power-off output current Ioff -1 1 µA VCC = 0 V, VOUT = 4.5 V 6
Quiescent supply current ICC 0.1 0.2 mA VCC = 5.25 V, VIN ≤ 0.2 V or VIN ≥ VCC, 0.2 V 6
Supply current per TTL high input ∆ICC 0.5 2 mA VCC = 5.25 V, VIN = 3.4 V, f1 = 0, outputs open 6
Total supply current, one bit switching at f1 = 5 MHz IC 0.7 1.4 mA VCC = 5.25 V, outputs open, G = DIR = GND, SAB = SBA = GND, one bit switching at f1 = 5 MHz, VIN ≤ 0.2 V or VIN ≥ VCC, 0.2 V 7
Total supply current, one bit at 50% duty cycle, f0 = 10 MHz IC 1.2 3.4 mA VCC = 5.25 V, f0 = 10 MHz, outputs open, one bit at 50% duty cycle, VIN = 3.4 V or GND 7
Total supply current, eight bits switching at f1 = 5 MHz IC 2.8 5.6 mA VCC = 5.25 V, outputs open, G = DIR = GND, SAB = SBA = GND, eight bits switching at f1 = 5 MHz, VIN ≤ 0.2 V or VIN ≥ VCC, 0.2 V; example of ICC formula 7
Total supply current, eight bits at 50% duty cycle IC 5.1 14.6 mA VCC = 5.25 V, outputs open, G = DIR = GND, SAB = SBA = GND, eight bits at 50% duty cycle, VIN = 3.4 V or GND; example of ICC formula 7
Input capacitance Ci 6 10 pF 7
Output capacitance Co 8 12 pF 7
Pulse duration tw 5 ns see Figure 2 8
Setup time, data before CPAB↑ or CPBA↑ tsu 2 ns see Figure 2 8
Hold time, data after CPAB↑ or CPBA↑ th 1.5 ns see Figure 2 8
Propagation delay A or B to B or A tPLH 1.5 6.3 ns see Figure 2 8
Enable time DIR to A or B tPZH 1.5 9.8 ns see Figure 2 8
Disable time G and DIR to A or B tPHZ 1.5 6.3 ns see Figure 2 8
Propagation delay CPAB or CPBA to A or B tPLH 1.5 6.3 ns see Figure 2 8
Propagation delay SBA or SAB to A or B tPLH 1.5 7.7 ns see Figure 2 8
Package thermal impedance, junction to ambient θJA 46 °C/W SO package, see Note 1 (JESD 51-7) 4

CAD (KiCad official)

  • Symbol: CY74FCT646ATSOCT
  • Footprint: Package_SO:SOIC-24W_7.5x15.4mm_P1.27mm
  • 3D model: SOIC-24-300mil (KiCad packages3D, STEP)
  • 3D model files: cy74fct646atsoct-etched.step / cy74fct646atsoct-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cy74fct646atsoct.step / cy74fct646atsoct.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (15 pp, sha256 13b3f72899297c10, retrieved 2026-11-05, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF