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Texas Instruments CY74FCT16646ATPVC
- Part No.:
- CY74FCT16646ATPVC
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT16646ATPVC.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
CY74FCT16646ATPVC from Texas Instruments is a 16-bit registered transceiver IC with three-state outputs, dual-bus bidirectional data routing, and clocked register storage. It operates at 5V ±10%, supports −40°C to +85°C industrial temperature range, delivers 64 mA sink / 32 mA source drive, and features Ioff partial-power-down capability. It is used in high-speed backplane interface and bus isolation applications requiring low ground bounce and precise timing control.
For engineers reviewing the CY74FCT16646ATPVC datasheet, CY74FCT16646ATPVC pinout, CY74FCT16646ATPVC application, or CY74FCT16646ATPVC equivalent, key selection criteria include propagation delay (≤6.3 ns), output skew (<250 ps), Ioff support for hot-swap systems, and SSOP-56 package compatibility with legacy FCT logic designs.
Technical Context
The CY74FCT16646ATPVC implements two independent 8-bit register banks (A and B) with separate clock inputs (CLKAB/CLKBA), direction control (DIR), and output enable (OE). Data can be latched transparently or stored synchronously on rising clock edges, enabling multiplexed real-time and registered data paths between buses.
Its edge-rate controlled outputs reduce switching noise and ground bounce (typical VOLP <1.0 V), while Ioff circuitry disables outputs during power-down to prevent backflow current. The device is fully specified for 5V operation and compatible with TTL input thresholds (VIH = 2.0 V, VIL = 0.8 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5 V ±10% - ensures compatibility with standard 5V TTL/CMOS systems and stable operation across industrial voltage variation. |
| Propagation Delay | ≤6.3 ns (max) - enables reliable 160+ MHz bus operation with sufficient timing margin for synchronous backplane transfers. |
| Output Drive | 64 mA sink / 32 mA source - provides robust drive strength for high-capacitance loads and unterminated backplanes. |
| Output Skew | <250 ps - guarantees tight inter-channel timing alignment critical for parallel data integrity in wide-bus systems. |
| Operating Temp | −40°C to +85°C - validated for deployment in industrial control, telecom infrastructure, and embedded computing environments. |
| Ioff Support | Yes - prevents damaging current flow when powered down, enabling safe partial-power-down in mixed-voltage systems. |
| ESD Rating | >2000 V (HBM) - meets industrial-level ESD robustness requirements without external protection components. |
Pinout & Package
Package: 56-pin SSOP (Shrink Small Outline Package), 300-mil body width, JEDEC MO-118 compliant, 0.630" × 0.370" footprint, 1.02 mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction Control Input | Determines data flow direction per 8-bit section: LOW routes B→A, HIGH routes A→B when OE is active. |
| 1OE, 2OE | Output Enable (Active LOW) | Disables all outputs to high-impedance state when HIGH; enables bidirectional transfer when LOW. |
| 1CLKAB, 2CLKAB | Register Clock (A-to-B) | Rising edge latches A-bus data into B-register; controls stored-data path from A to B. |
| 1CLKBA, 2CLKBA | Register Clock (B-to-A) | Rising edge latches B-bus data into A-register; controls stored-data path from B to A. |
| 1SAB, 2SAB | Source Select (A/B Output) | Selects whether output drives real-time or registered data from A or B bus onto opposite bus. |
| 1SBA, 2SBA | Source Select (B/A Output) | Complements SAB to configure full multiplexed output sourcing for each 8-bit channel. |
| A1–A8, B1–B8 (x2) | Data Bus Terminals | Two independent 8-bit bidirectional I/O ports; each pin serves as input or output depending on DIR/OE state. |
| VCC, GND (x4) | Power & Ground | Multiple distributed supply/ground pins minimize IR drop and improve noise immunity in high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ioff partial-power-down | Enables safe insertion/removal in live backplanes by disabling outputs and blocking reverse current when VCC = 0 V. |
| Edge-rate controlled outputs | Reduces system-level EMI and ground bounce (VOLP <1.0 V), eliminating need for external series termination in many cases. |
| Low output skew | <250 ps skew across all 16 outputs ensures deterministic setup/hold timing for parallel data capture in synchronous systems. |
| High drive strength | 64 mA sink capability allows direct driving of 50 Ω transmission lines or high-CL backplanes without buffers. |
| TTL-compatible inputs | VIH = 2.0 V / VIL = 0.8 V thresholds ensure seamless interfacing with legacy 5V microcontrollers, FPGAs, and ASICs. |
Applications
| Industrial Backplane Interface | Memory-Mapped I/O Expansion |
|---|---|
|
Use Scenario: Interfacing a 16-bit microcontroller bus to a multi-slot industrial backplane with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional registered transceiver providing isolated, clock-synchronized data transfer between CPU and peripheral slots. Use Value: Ioff support enables safe card insertion/removal; 6.3 ns propagation delay ensures timing closure at 100+ MHz bus rates. |
Use Scenario: Expanding address/data bus width between an FPGA and multiple legacy peripherals (e.g., UARTs, ADCs, GPIOs). IC Role / Device Role / Timing Role: Registered bus transceiver acting as timing bridge and level-shifter between FPGA I/O and 5V peripheral logic. Use Value: Dual-clock architecture (CLKAB/CLKBA) allows independent latching of A- and B-side data, enabling pipelined I/O access. |
| Telecom Line Card Buffering | Test Equipment Signal Routing |
|
Use Scenario: Isolating and conditioning data paths between DSP cores and line interface units in modular telecom chassis. IC Role / Device Role / Timing Role: High-drive transceiver buffering bidirectional TDM or packet data streams with minimal added jitter. Use Value: 64 mA sink current drives long PCB traces and connector stubs; low skew preserves signal integrity across 16-bit parallel links. |
Use Scenario: Reconfigurable signal routing matrix in automated test equipment (ATE) for DUT interface adaptation. IC Role / Device Role / Timing Role: Programmable bus switch with register hold capability, supporting both transparent and stored data modes. Use Value: SAB/SBA select inputs enable dynamic reconfiguration of data paths without FPGA reprogramming; OE/DIR allow software-controlled isolation. |
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 |
|---|---|---|---|
| CY74FCT16646CTPVC | 5.4 ns max propagation delay (vs. 6.3 ns); otherwise identical electrical specs and pinout. | Better suited for higher-frequency timing-critical backplane interfaces where sub-6 ns delay is required. | Select CY74FCT16646CTPVC if design requires tighter timing margins; same footprint and layout. |
| CY74FCT162646ATPVC | 24 mA balanced drivers (vs. 64/32 mA asymmetrical); lower ground bounce (VOLP <0.6 V); different drive profile. | Optimized for transmission-line driving with reduced reflections; less suitable for high-CL backplanes requiring strong sink current. | Choose CY74FCT162646ATPVC for point-to-point LVDS-adjacent or controlled-impedance trace routing; not drop-in for high-sink loads. |
Compared with CY74FCT16646CTPVC, the CY74FCT16646ATPVC trades 0.9 ns of speed for broader availability and cost efficiency; versus CY74FCT162646ATPVC, it offers superior sink drive for legacy backplane loads but higher ground bounce.
Availability
CY74FCT16646ATPVC is available at Aetrix Electronics and suitable for industrial backplane interface, memory-mapped I/O expansion, and telecom line card buffering requiring stable component supply and long-term lifecycle support.
Supply support for CY74FCT16646ATPVC 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 over 50 years of innovation in high-reliability interface and timing products.
The CY74FCT16646ATPVC belongs to TI's FCT logic family, designed specifically for high-speed, low-noise 5V bus interfacing in industrial, telecom, and computing infrastructure applications.
FAQ
What is the maximum operating frequency supported by the CY74FCT16646ATPVC?
The CY74FCT16646ATPVC does not specify a maximum clock frequency directly, but its 6.3 ns maximum propagation delay and 5.0 ns minimum clock pulse width support reliable operation up to approximately 160 MHz in well-designed 5V systems with controlled trace impedance and load capacitance. Actual achievable frequency depends on board layout, termination, and fanout.
Does the CY74FCT16646ATPVC support hot-swap or partial-power-down operation?
Yes, the CY74FCT16646ATPVC includes Ioff circuitry that actively disables outputs and blocks current backflow when VCC = 0 V, enabling safe hot-insertion into live backplanes. This feature is fully characterized over the industrial temperature range and requires no external circuitry to implement.
What is the difference between CY74FCT16646ATPVC and CY74FCT162646ATPVC?
The CY74FCT16646ATPVC provides asymmetric 64 mA sink / 32 mA source drive optimized for high-capacitance backplanes, while the CY74FCT162646ATPVC uses balanced 24 mA drivers with current-limiting resistors to reduce ground bounce and transmission-line reflections. They share pinout and logic function but differ electrically and are not interchangeable without redesign.
Can the CY74FCT16646ATPVC operate with 3.3V logic inputs?
No - the CY74FCT16646ATPVC is a 5V-only device with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). While 3.3V CMOS outputs may meet VIH under ideal conditions, TI does not guarantee operation with 3.3V inputs; level translation is recommended for mixed-voltage systems.
Is the CY74FCT16646ATPVC pin-compatible with other FCT-series 16-bit transceivers?
Yes - the CY74FCT16646ATPVC shares identical 56-pin SSOP (DL) packaging, pin assignment, and logic function with CY74FCT16646CTPVC and CY74FCT16646TPVC. All variants use the same pinout diagram (FCT16646-3), enabling direct replacement within the same speed grade family.
CY74FCT16646ATPVC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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
CY74FCT16646ATPVC FAQ
1.How can I place an order for CY74FCT16646ATPVC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT16646ATPVC 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 CY74FCT16646ATPVC reliable?
The price and inventory of CY74FCT16646ATPVC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT16646ATPVC is usually 5 days.
3.What payment methods are accepted for CY74FCT16646ATPVC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT16646ATPVC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT16646ATPVC?
CY74FCT16646ATPVC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT16646ATPVC 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 CY74FCT16646ATPVC?
For technical support, including CY74FCT16646ATPVC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT16646ATPVC requirements.
6.How does Aetrix verify that CY74FCT16646ATPVC is sourced from the original manufacturer or authorized distributors?
All CY74FCT16646ATPVC 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 CY74FCT16646ATPVC meets industry standards.
7.What is the process for return or replacement of CY74FCT16646ATPVC?
All CY74FCT16646ATPVC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT16646ATPVC, 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 CY74FCT16646ATPVC part is unused and in its original packaging.
Return procedure for CY74FCT16646ATPVC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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