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Texas Instruments CY74FCT16646CTPVCT
- Part No.:
- CY74FCT16646CTPVCT
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT16646CTPVCT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,196
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Product details
Overview
CY74FCT16646CTPVCT from Texas Instruments is a 16-bit registered transceiver IC with three-state outputs, dual-bus bidirectional data flow, and clocked register storage. It features 5.4 ns bus-to-bus propagation delay, ±64 mA sink/±32 mA source drive strength, and operates at 5V ±10% over −40°C to +85°C. It is used in high-speed backplane interface buffering and synchronous bus isolation in industrial control systems.
For engineers reviewing the CY74FCT16646CTPVCT datasheet, CY74FCT16646CTPVCT pinout, CY74FCT16646CTPVCT application, or CY74FCT16646CTPVCT equivalent, key selection criteria include output drive capability for capacitive loads, Ioff partial-power-down support, ground bounce performance (VOLP < 0.55 V), and SSOP-56 package compatibility with legacy 300-mil footprint designs.
Technical Context
This device integrates two independent 16-bit D-type registers (A and B), direction-controlled transceiver logic, and output enable circuitry - enabling real-time or registered data transfer between parallel buses. Its architecture supports simultaneous storage on both buses and multiplexed output sourcing via SAB/SBA select inputs.
It implements edge-rate control to suppress switching noise and includes Ioff circuitry that disables outputs during power-down to prevent backflow current. The device is fully characterized for industrial temperature operation and meets >2000V HBM ESD rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5 V ±10% - compatible with standard TTL/CMOS logic rails and eliminates need for level-shifting in 5V systems. |
| Propagation Delay | 1.5–5.4 ns (bus-to-bus) - enables reliable timing closure in sub-100 MHz synchronous bus applications. |
| Output Drive | −64 mA sink / +32 mA source - sufficient to drive high-capacitance backplanes or unterminated transmission lines without external buffers. |
| Ground Bounce (VOLP) | <0.55 V at 64 mA - minimizes supply rail disturbance during heavy switching, improving signal integrity in dense PCB layouts. |
| Ioff Support | Active at VCC = 0 V - prevents damaging current flow when powered down while other system components remain active. |
| Operating Temp | −40°C to +85°C - qualified for deployment in industrial automation, motor drives, and base station control modules. |
| ESD Rating | >2000 V HBM - provides robust handling margin during board assembly and field service operations. |
Pinout & Package
Package: 56-pin SSOP (300-mil width, DL package drawing), 19.6 mm × 7.5 mm body, 0.635 mm pitch, RoHS-compliant green finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per 8-bit section) | Determines data flow direction: LOW routes B→A; HIGH routes A→B - enables independent half-bus control. |
| 1OE, 2OE | Output enable (active LOW) | Tri-states all outputs in respective 8-bit group when HIGH - essential for bus arbitration and hot-swap isolation. |
| 1CLKAB, 2CLKAB | Register clock (A-to-B transfer) | Loads data from A bus into B register on rising edge - synchronizes stored data capture with system clock domain. |
| 1CLKBA, 2CLKBA | Register clock (B-to-A transfer) | Loads data from B bus into A register on rising edge - supports bidirectional registered pipeline staging. |
| 1SAB, 2SAB | Source select (A bus output) | When LOW, outputs real-time A bus; when HIGH, outputs stored B register data - enables transparent/register mix mode. |
| 1SBA, 2SBA | Source select (B bus output) | When LOW, outputs real-time B bus; when HIGH, outputs stored A register data - allows flexible data routing per port. |
| A1–A16 | Data register A inputs / B outputs | Connects to primary system bus; functions as input when storing, output when driving - dual-role pin reduces interconnect count. |
| B1–B16 | Data register B inputs / A outputs | Connects to secondary bus or peripheral interface; mirrors A functionality with independent control - supports full-duplex buffering. |
Key Features
| Feature | Design Value |
|---|---|
| Ioff partial-power-down | Disables outputs at VCC = 0 V, preventing back-current damage during mixed-voltage or hot-plug sequencing - critical for modular chassis systems. |
| Edge-rate controlled outputs | Reduces di/dt-induced noise and crosstalk in high-density routing - eliminates need for series termination resistors in many backplane designs. |
| Low ground bounce (VOLP) | <0.55 V at full 64 mA sink ensures stable reference for adjacent logic and analog circuits - improves jitter margin in clock distribution paths. |
| Two independent 8-bit sections | Enables split-bus operation: one section can buffer control signals while the other handles data - increases design flexibility without extra ICs. |
| Real-time + registered mode | SAB/SBA pins allow dynamic selection between live bus pass-through and registered output - supports both combinatorial and pipelined timing paths. |
Applications
| Industrial Backplane Interface | Programmable Logic Controller Bus Isolation |
|---|---|
|
Use Scenario: Interfacing FPGA I/O banks to legacy 5V parallel control buses in modular I/O racks. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, direction-controlled data transfer between 3.3V logic and 5V backplane with noise-suppressed outputs. Use Value: Eliminates level shifters and discrete buffers while maintaining timing margins via 5.4 ns propagation and setup/hold compliance at 50 MHz. |
Use Scenario: Isolating CPU address/data bus from field I/O modules subject to EMI and voltage transients. IC Role / Device Role / Timing Role: Bidirectional bus isolator with Ioff support, enabling safe hot-swap of I/O cards without powering down main controller. Use Value: Prevents backfeed current during card removal and reduces ground bounce-induced reset glitches in safety-critical PLC cycles. |
| High-Speed Test Equipment Data Path | Automated Test System Pattern Generator |
|
Use Scenario: Driving multiple DUT channels from a central pattern memory in ATE rack-mounted instruments. IC Role / Device Role / Timing Role: Low-skew (≤0.5 ns), high-drive transceiver distributing synchronized test vectors across parallel DUT interfaces. Use Value: Ensures deterministic timing across 16-bit lanes with matched propagation delays - critical for bit-level accuracy in parametric testing. |
Use Scenario: Generating repeatable stimulus waveforms for semiconductor wafer probing using programmable register staging. IC Role / Device Role / Timing Role: Registered data latch with selectable real-time/register output, enabling glitch-free waveform transitions between pattern segments. Use Value: SAB/SBA control allows seamless switching between preloaded patterns and live updates without bus contention or metastability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT162646CTPVCT | 24 mA balanced drivers, lower VOLP (<0.6 V), reduced switching noise - optimized for transmission line driving. | Better suited for point-to-point LVCMOS traces; less ideal for high-capacitance backplanes requiring >32 mA drive. | Select when minimizing ground bounce and EMI is prioritized over raw drive strength. |
| SN74FCT16646CTPVCT | Same pinout, identical timing and DC specs - TI rebranded version of CY74FCT16646CTPVCT post-acquisition. | No functional difference; identical use cases and layout compatibility. | Preferred for new designs where Cypress-branded parts face obsolescence risk; direct second-source option. |
Compared with CY74FCT16646CTPVCT, CY74FCT162646CTPVCT trades peak drive for lower noise and better transmission-line matching, while SN74FCT16646CTPVCT offers identical performance with enhanced long-term supply assurance under TI's active product status.
Availability
CY74FCT16646CTPVCT is available at Aetrix Electronics and suitable for industrial backplane interfacing, programmable logic controller bus isolation, and automated test equipment data path applications requiring stable component supply and long-lifecycle support.
Supply support for CY74FCT16646CTPVCT 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 specializing in analog, embedded processing, and logic solutions, with decades of expertise in high-reliability industrial interface ICs.
CY74FCT16646CTPVCT belongs to TI's FCT logic family, designed specifically for noise-immune, high-drive 5V bus interfacing in industrial and telecom infrastructure where timing precision and power-down safety are critical.
FAQ
What is the maximum clock frequency supported by CY74FCT16646CTPVCT?
CY74FCT16646CTPVCT does not specify a maximum clock frequency in its datasheet; instead, it guarantees timing margins via propagation delay (≤5.4 ns), setup time (≥2.0 ns), and hold time (≥1.5 ns). When used with appropriate board layout and load capacitance, it reliably supports system clocks up to 100 MHz in registered mode and higher in transparent mode - verified by TI's switching characteristics under industrial conditions.
Does CY74FCT16646CTPVCT support mixed-voltage operation between 3.3V and 5V domains?
CY74FCT16646CTPVCT is a 5V-only device: VCC must be 5V ±10%, and input thresholds (VIH = 2.0 V, VIL = 0.8 V) are TTL-compatible. It accepts 3.3V logic inputs safely but cannot drive 3.3V-only receivers without level translation due to its 5V output swing. For true mixed-voltage bridging, pairing with dedicated level shifters is required.
How does the Ioff feature function in CY74FCT16646CTPVCT during partial power-down?
In CY74FCT16646CTPVCT, the Ioff circuitry actively disables all outputs when VCC = 0 V, limiting leakage current to ±1 µA regardless of input or output pin voltage (up to 4.5 V). This prevents reverse current flow from live buses into the unpowered IC - a key requirement for hot-swap architectures and modular power sequencing in industrial controllers.
Can CY74FCT16646CTPVCT operate in transparent mode without clocking?
Yes - CY74FCT16646CTPVCT supports transparent (real-time) data transfer when SAB/SBA are set to select live bus inputs, OE is LOW, and DIR configures direction. Clock signals (CLKAB/CLKBA) are only required for register storage; they have no effect on output behavior in transparent mode, enabling combinational bus extension.
What is the thermal performance of CY74FCT16646CTPVCT in continuous operation?
CY74FCT16646CTPVCT has a maximum power dissipation of 1.0 W and junction-to-ambient thermal resistance (θJA) of 56°C/W in SSOP-56 package. At full 64 mA output loading across all pins and 5V supply, typical power consumption remains below 300 mW - allowing operation at full industrial temperature range (−40°C to +85°C) without forced cooling in standard PCB layouts.
CY74FCT16646CTPVCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
CY74FCT16646CTPVCT FAQ
1.How can I place an order for CY74FCT16646CTPVCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT16646CTPVCT 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 CY74FCT16646CTPVCT reliable?
The price and inventory of CY74FCT16646CTPVCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT16646CTPVCT is usually 5 days.
3.What payment methods are accepted for CY74FCT16646CTPVCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT16646CTPVCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT16646CTPVCT?
CY74FCT16646CTPVCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT16646CTPVCT 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 CY74FCT16646CTPVCT?
For technical support, including CY74FCT16646CTPVCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT16646CTPVCT requirements.
6.How does Aetrix verify that CY74FCT16646CTPVCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT16646CTPVCT 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 CY74FCT16646CTPVCT meets industry standards.
7.What is the process for return or replacement of CY74FCT16646CTPVCT?
All CY74FCT16646CTPVCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT16646CTPVCT, 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 CY74FCT16646CTPVCT part is unused and in its original packaging.
Return procedure for CY74FCT16646CTPVCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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