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Texas Instruments CY74FCT652ATSOCT
- Part No.:
- CY74FCT652ATSOCT
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT652ATSOCT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:697
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Product details
Overview
CY74FCT652ATSOCT from Texas Instruments is an 8-bit registered transceiver with 3-state outputs, designed for bidirectional data bus interfacing in TTL-compatible systems. It features independent A/B registers, real-time/stored-data multiplexing, 6.3 ns propagation delay (tPLH/tPHL), ±32 mA output drive, and Ioff partial-power-down support. It operates across –40°C to 85°C in SOIC-24 package and is used in memory address/data bus isolation and register-controlled system interconnects.
For engineers reviewing the CY74FCT652ATSOCT datasheet, CY74FCT652ATSOCT pinout, CY74FCT652ATSOCT application, or CY74FCT652ATSOCT equivalent, key selection criteria include registered vs. transparent transfer mode, simultaneous clock edge handling, Ioff-enabled power sequencing, and 5-V TTL/CMOS logic level compatibility.
Technical Context
The CY74FCT652ATSOCT integrates dual 8-bit D-type flip-flop banks (A and B) with separate CPAB/CPBA clocks and SAB/SBA select controls, enabling synchronized storage of data from either bus. Its edge-rate control circuitry reduces switching noise while maintaining matched rise/fall times.
GAB and GBA enable signals independently gate 3-state outputs on each bus side, supporting isolation, real-time pass-through, or stored-data forwarding. The device eliminates multiplexer glitches during mode transitions via glitch-free select logic and supports partial-power-down via Ioff, which disables outputs when VCC = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 6.3 ns max (A↔B), enabling high-speed synchronous bus handshaking at ≤100 MHz system clock rates |
| Output Drive | 64 mA sink / 32 mA source per pin, sufficient to drive heavy TTL loads or multiple FCT inputs without external buffers |
| Supply Voltage | 4.75–5.25 V, compatible with standard 5-V logic rails and tolerant of typical board-level ripple |
| Ioff Support | Active at VCC = 0 V, preventing backflow current during hot-swap or power sequencing in multi-rail systems |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - fully compatible with TTL input levels and robust against noise margins |
| Operating Temp | –40°C to +85°C, qualified for industrial-grade embedded control and communications equipment |
| Package | SOIC-24 (DW), 0.300″ wide body, JEDEC MS-013 compliant, suitable for automated PCB assembly |
Pinout & Package
SOIC-24 (DW) package, 0.300″ body width, 1.27 mm pitch, RoHS-compliant NiPdAu finish, MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 23 | CPAB / CPBA | Low-to-high clock edges latch data from A→B or B→A buses into respective registers; asynchronous to enable/select states |
| 2, 22 | SAB / SBA | Select control: low = real-time transfer, high = stored-data transfer; glitch-free transition prevents bus contention |
| 3, 21 | GAB / GBA | 3-state output enables: low = output active, high = high-impedance; independent control per bus direction |
| 4–11 | A1–A8 | 8-bit bidirectional data port A; inputs when GAB = L and data sourced from B, outputs when GAB = L and data sourced from A register |
| 14–21 | B1–B8 | 8-bit bidirectional data port B; functions symmetrically to A port under GBA control and CPBA/SBA timing |
| 12 | GND | Ground reference for all logic and I/O circuits; must be low-inductance connection for noise immunity |
| 13 | VCC | 5-V supply rail; decoupling capacitor (0.1 µF ceramic) required within 1 cm of pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Independent A/B Registers | Enables concurrent capture of data from both buses on separate clock edges, supporting full-duplex buffered interconnect |
| Glitch-Free Select Logic | Eliminates transient bus contention during SAB/SBA transitions between real-time and stored modes, improving system reliability |
| Edge-Rate Controlled Outputs | Reduces EMI and ground bounce in dense PCB layouts without sacrificing speed - critical for mixed-signal environments |
| TTL-Compatible I/O Levels | Accepts standard TTL VIH/VIL thresholds and drives TTL loads directly, removing need for level-shifting components |
| Matched Rise/Fall Times | Ensures symmetrical signal integrity on bidirectional buses, minimizing skew-induced setup/hold violations |
Applications
| Memory Address Bus Isolation | Microprocessor System Interconnect |
|---|---|
Use Scenario: Isolating CPU address bus from peripheral address decoders during DMA cycles or bus arbitration. IC Role / Device Role / Timing Role: Registered transceiver latches and forwards address bits with controlled timing, preventing decoder glitches during bus handoffs. Use Value: Eliminates address bus contention and decoding errors during high-speed bus sharing, ensuring deterministic peripheral access. | Use Scenario: Connecting two microprocessor subsystems (e.g., host + co-processor) sharing a common data bus with independent clock domains. IC Role / Device Role / Timing Role: Bidirectional registered buffer synchronizes data transfers between asynchronous clocks using CPAB/CPBA edges and SAB/SBA mode selection. Use Value: Enables reliable cross-domain data exchange without FIFOs or complex handshake logic, reducing BOM and latency. |
| Industrial PLC Backplane Interface | Digital Signal Processor (DSP) Memory Bridge |
Use Scenario: Buffering I/O module configuration data between a central controller and distributed I/O racks over a noisy industrial backplane. IC Role / Device Role / Timing Role: Transceiver provides noise-immune, registered data transfer with Ioff support for safe hot-swap insertion/removal of modules. Use Value: Prevents backfeed current and bus corruption during live module replacement, meeting IEC 61000-4-2/4-4 immunity requirements. | Use Scenario: Interfacing a DSP's external memory bus to a high-speed SRAM or FIFO with strict timing margins. IC Role / Device Role / Timing Role: Stores and forwards memory address/data with sub-7 ns propagation and matched edge rates to meet tight setup/hold windows. Use Value: Enables maximum DSP memory bandwidth without timing closure issues, supporting real-time signal processing pipelines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT652CTSOCT | 5.4 ns max propagation delay (vs. 6.3 ns); identical pinout, function, and voltage specs | Better suited for systems requiring tighter timing margins or higher clock frequencies (>120 MHz bus rate) | Select when absolute minimum delay is critical and layout allows same SOIC-24 footprint |
| SN74FCT652ATSOG4 | Same 6.3 ns speed grade, but in SOIC-24 tube packaging (not tape-and-reel); identical electrical behavior | Preferred for low-volume prototyping or manual assembly where reel packaging is unnecessary | Choose for lab evaluation or small-batch builds where tape-and-reel logistics are impractical |
Compared with CY74FCT652CTSOCT, the CY74FCT652ATSOCT trades 0.9 ns of speed for broader availability in tape-and-reel format; versus SN74FCT652ATSOG4, it offers identical performance with optimized logistics for automated SMT production.
Availability
CY74FCT652ATSOCT is available at Aetrix Electronics and suitable for industrial control systems, embedded processor interconnects, and memory interface designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for CY74FCT652ATSOCT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The CY74FCT652ATSOCT belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible bus interfacing in mission-critical industrial and computing systems.
FAQ
What is the maximum clock frequency supported by CY74FCT652ATSOCT for reliable register loading?
CY74FCT652ATSOCT does not specify a maximum clock frequency; instead, it defines minimum pulse width (tw ≥ 5 ns) and setup/hold times (tsu = 2 ns, th = 1.5 ns). For reliable register loading, the maximum usable clock frequency is determined by the sum of tsu + th + tw, yielding ~100 MHz in typical PCB layouts with proper termination and decoupling. The CY74FCT652ATSOCT is validated for use in systems with clock edges meeting these timing constraints.
Does CY74FCT652ATSOCT support hot-swap or partial-power-down operation?
Yes, CY74FCT652ATSOCT supports partial-power-down via its Ioff feature. When VCC = 0 V, the Ioff circuitry disables all outputs, limiting off-state current to ±1 µA and preventing damaging backflow current from live buses. This enables safe insertion/removal in powered-backplane systems - a key requirement for CY74FCT652ATSOCT in industrial PLC and telecom shelf applications.
Can CY74FCT652ATSOCT operate with 3.3-V input signals while powered at 5 V?
No - CY74FCT652ATSOCT is a 5-V-only device with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). While 3.3-V logic may exceed VIH in many cases, it falls outside guaranteed operating conditions and risks marginal functionality due to reduced noise margin. For mixed-voltage systems, CY74FCT652ATSOCT requires level translation or 5-V signaling; it is not 3.3-V tolerant.
How does the glitch-free select logic in CY74FCT652ATSOCT prevent bus contention?
The CY74FCT652ATSOCT uses dedicated internal logic that decouples SAB/SBA transitions from clock and enable paths, ensuring no intermediate state where both real-time and stored outputs drive simultaneously. This eliminates the brief contention window seen in basic multiplexers, making CY74FCT652ATSOCT suitable for systems where bus stability during mode switching is critical - such as memory-mapped I/O arbitration.
What is the thermal performance of CY74FCT652ATSOCT in SOIC-24 package?
CY74FCT652ATSOCT in SOIC-24 (DW) package has a specified θJA of 46°C/W under JEDEC JESD51-7 conditions. At maximum rated ICCD (5.6 mA) and worst-case ambient (85°C), junction temperature remains below 125°C with standard 1-layer copper pour. For sustained high-output-drive operation, CY74FCT652ATSOCT benefits from local thermal relief and 2+ oz copper on VCC/GND planes to maintain reliability.
CY74FCT652ATSOCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
CY74FCT652ATSOCT FAQ
1.How can I place an order for CY74FCT652ATSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT652ATSOCT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CY74FCT652ATSOCT reliable?
The price and inventory of CY74FCT652ATSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT652ATSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT652ATSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT652ATSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT652ATSOCT?
CY74FCT652ATSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT652ATSOCT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CY74FCT652ATSOCT?
For technical support, including CY74FCT652ATSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT652ATSOCT requirements.
6.How does Aetrix verify that CY74FCT652ATSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT652ATSOCT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY74FCT652ATSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT652ATSOCT?
All CY74FCT652ATSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT652ATSOCT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CY74FCT652ATSOCT part is unused and in its original packaging.
Return procedure for CY74FCT652ATSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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