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Texas Instruments CY74FCT16646CTPVC
- Part No.:
- CY74FCT16646CTPVC
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT16646CTPVC.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,764
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Product details
Overview
CY74FCT16646CTPVC from Texas Instruments is a 16-bit registered transceiver IC with three-state outputs, dual-bus bidirectional data flow, and clocked register storage on both A and B buses. It operates at 5V ±10%, supports −40°C to +85°C industrial temperature range, delivers 64 mA sink / 32 mA source drive, and achieves 5.4 ns max bus-to-bus propagation delay. It is used in high-speed backplane interface buffering and synchronous bus isolation in industrial control systems.
For engineers reviewing the CY74FCT16646CTPVC datasheet, CY74FCT16646CTPVC pinout, CY74FCT16646CTPVC application, or CY74FCT16646CTPVC equivalent, key selection criteria include its 56-pin SSOP package, Ioff partial-power-down capability, edge-rate controlled outputs for noise reduction, and precise timing parameters including tPLH/tPHL ≤5.4 ns and output skew <0.5 ns.
Technical Context
The CY74FCT16646CTPVC implements dual 16-bit D-type registers with independent CLKAB/CLKBA inputs, enabling synchronized latching of data from either bus into corresponding A or B registers. Its DIR and OE pins jointly control directionality and output enable state, supporting real-time transparent transfer, stored-data multiplexing, and full bus isolation modes.
It integrates Ioff circuitry to disable outputs during power-down, preventing backflow current, and features edge-rate control to suppress ground bounce (typical VOLP <0.55 V at 64 mA) and improve signal integrity on high-capacitance loads and backplanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no level-shifting required in 5V systems |
| Propagation Delay | ≤5.4 ns (bus-to-bus) - enables reliable operation in sub-200 MHz synchronous bus environments |
| Output Drive | 64 mA sink / 32 mA source - sufficient to drive heavy capacitive loads and unterminated backplanes |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded and automation equipment |
| Ioff Support | Yes - prevents damaging current flow when VCC = 0 V, enabling safe hot-swap and partial power-down |
| ESD Rating | >2000 V HBM - provides robust handling margin during board assembly and field service |
| Output Skew | <0.5 ns - ensures tight timing alignment across all 32 outputs, critical for parallel bus integrity |
Pinout & Package
56-pin SSOP (Shrink Small Outline Package), 300-mil body width, 0.635 mm pitch, JEDEC MO-118 compliant. Package dimensions: 13.9–14.1 mm × 7.9–8.3 mm × 2.4 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A8, 2A1–2A8 | A-bus data inputs / outputs | Register A port; bidirectional under DIR/OE control; connected to local system bus |
| 1B1–1B8, 2B1–2B8 | B-bus data inputs / outputs | Register B port; bidirectional under DIR/OE control; connected to remote/backplane bus |
| 1CLKAB, 2CLKAB | Bus A → Bus B clock input | Positive-edge-triggered latch control for transferring A-bus data into B-register |
| 1CLKBA, 2CLKBA | Bus B → Bus A clock input | Positive-edge-triggered latch control for transferring B-bus data into A-register |
| 1DIR, 2DIR | Direction control input | Active-HIGH selects B→A data flow; LOW selects A→B flow when OE is active |
| 1OE, 2OE | Output enable (active LOW) | Disables all outputs (high-Z) when HIGH; enables bidirectional transfer when LOW |
| 1SAB, 2SAB | Source select A→B | Selects real-time A-bus or stored A-register data for output onto B-bus |
| 1SBA, 2SBA | Source select B→A | Selects real-time B-bus or stored B-register data for output onto A-bus |
| VCC, GND | Power supply terminals | Single 5V supply; 8 dedicated VCC and 8 GND pins minimize switching noise and IR drop |
Key Features
| Feature | Design Value |
|---|---|
| Ioff partial-power-down | Prevents reverse current flow when powered down - essential for hot-pluggable modules and power-gated subsystems |
| Edge-rate controlled outputs | Reduces ground bounce (VOLP <0.55 V) and EMI - eliminates need for external series termination in many layouts |
| Dual independent clock inputs | Enables asynchronous registration of A- and B-bus data - supports flexible timing between domains |
| Source-select multiplexing | Allows mixing real-time and registered data per channel - increases protocol flexibility without external logic |
| High sink current (64 mA) | Drives low-impedance backplanes and long traces directly - reduces need for buffer repeaters |
Applications
| Industrial Backplane Interface | Programmable Logic Controller (PLC) I/O Module |
|---|---|
Use Scenario: Bidirectional data exchange between CPU module and distributed I/O racks over a 16-bit parallel backplane. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, noise-immune bus isolation with clocked data capture on both sides. Use Value: Eliminates metastability risk via register staging, while 64 mA drive ensures signal integrity across 30 cm+ backplane traces. | Use Scenario: Interfacing FPGA-based logic core to modular analog/digital I/O cards with configurable data width and timing. IC Role / Device Role / Timing Role: Direction-controlled, source-multiplexed transceiver enabling dynamic bus topology reconfiguration. Use Value: SAB/SBA select pins allow runtime switching between live sensor data and buffered command responses - improving real-time responsiveness. |
| Automated Test Equipment (ATE) Fixture | Legacy System Bus Bridge |
Use Scenario: High-speed stimulus/response path between pattern generator and device-under-test (DUT) with strict setup/hold timing. IC Role / Device Role / Timing Role: Low-skew (<0.5 ns), low-propagation-delay (5.4 ns) registered buffer ensuring deterministic timing margins. Use Value: Tight skew and predictable delays enable sub-10 ns timing windows - critical for validating nanosecond-scale DUT behavior. | Use Scenario: Bridging ISA or VME bus peripherals to modern microcontroller subsystems requiring voltage and timing translation. IC Role / Device Role / Timing Role: Level-compatible (5V TTL), register-staged interface preserving legacy timing while isolating domains. Use Value: Ioff support allows safe insertion/removal of legacy cards without powering down entire system - simplifying field maintenance. |
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 |
|---|---|---|---|
| CY74FCT16646ATPVC | Slower 6.3 ns max propagation delay; otherwise identical pinout, function, and drive strength | Suitable where timing budget allows relaxed delay; lower power at same frequency due to reduced speed grade | Select when system clock rate ≤80 MHz and lower dynamic power is prioritized over maximum throughput |
| CY74FCT162646CTPVC | 24 mA balanced drivers (vs. 64/32 mA asymmetrical); lower ground bounce (VOLP <0.55 V → <0.6 V); TSSOP option available | Better suited for transmission-line routing and EMI-sensitive environments; less ideal for heavy capacitive loads | Choose for point-to-point or controlled-impedance interconnects; avoid when driving >50 pF loads or unterminated stubs |
Compared with CY74FCT16646ATPVC, the CY74FCT16646CTPVC offers tighter timing for higher-speed backplanes; compared with CY74FCT162646CTPVC, it provides stronger sink current for legacy backplane compatibility but with higher ground bounce - making it optimal for industrial control over high-noise, high-capacitance interconnects.
Availability
CY74FCT16646CTPVC is available at Aetrix Electronics and suitable for industrial backplane interfaces, PLC I/O modules, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CY74FCT16646CTPVC 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 and automotive ICs.
The CY74FCT16646CTPVC belongs to TI's FCT logic family, designed specifically for noise-immune, high-drive 5V bus interfacing in industrial automation, test instrumentation, and legacy system upgrades.
FAQ
What is the maximum clock frequency supported by CY74FCT16646CTPVC?
The CY74FCT16646CTPVC does not specify a maximum clock frequency in its datasheet; instead, it guarantees timing margins via propagation delay (≤5.4 ns bus-to-bus) and minimum clock pulse width (≥5.0 ns). For reliable operation, the maximum usable frequency depends on system-level setup/hold times and board trace delays - typically supporting clean 100–150 MHz clock domains when properly terminated and routed. The CY74FCT16646CTPVC is optimized for synchronous bus applications rather than free-running clock domains.
Does CY74FCT16646CTPVC support mixed-voltage operation (e.g., 3.3V inputs with 5V VCC)?
No, CY74FCT16646CTPVC is a 5V-only device. Its input thresholds (VIH ≥2.0 V, VIL ≤0.8 V) and absolute maximum ratings (DC input voltage −0.5 V to +7.0 V) permit direct connection to 3.3V CMOS outputs, but only if those outputs are 5V-tolerant and driven within the specified VIH/VIL window. It does not translate voltages - all signals must be referenced to the 5V VCC rail. For true 3.3V↔5V translation, a dedicated level-shifter IC is required alongside the CY74FCT16646CTPVC.
How does the Ioff feature work in CY74FCT16646CTPVC, and what protection does it provide?
The Ioff circuitry in CY74FCT16646CTPVC automatically disables all outputs when VCC = 0 V, regardless of input voltage levels. This prevents current from flowing backward through the device - for example, from a live 5V bus into a powered-down subsystem. Measured Ioff leakage is ±1 µA at VOUT ≤4.5 V, ensuring safe hot-swap capability and eliminating latch-up risk. This feature is integral to the CY74FCT16646CTPVC silicon design and requires no external components or configuration.
Can CY74FCT16646CTPVC operate in isolation mode with data stored in both registers simultaneously?
Yes. When OE is HIGH (isolation mode), the CY74FCT16646CTPVC maintains high-impedance outputs while still allowing clocked data capture: A-bus data can be latched into the B-register via CLKAB, and B-bus data can be latched into the A-register via CLKBA - concurrently and independently. This enables pre-loading of both registers before enabling output, supporting pipelined or double-buffered data transfer protocols. The CY74FCT16646CTPVC retains stored data as long as VCC remains within specification, even with OE held high indefinitely.
What is the thermal resistance (θJA) of CY74FCT16646CTPVC in its SSOP package?
The datasheet does not publish θJA for CY74FCT16646CTPVC in SSOP (DL) package. However, based on TI's typical characterization for 56-pin SSOP devices under JEDEC JESD51-2 conditions (single-layer board, 1 in² copper pad), θJA is approximately 65°C/W. Actual thermal performance depends heavily on PCB layout - use of internal/external copper planes, number of thermal vias, and airflow. For sustained 64 mA per output operation, derating is recommended above 70°C ambient; the CY74FCT16646CTPVC is rated for full performance up to +85°C junction temperature.
CY74FCT16646CTPVC 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
CY74FCT16646CTPVC FAQ
1.How can I place an order for CY74FCT16646CTPVC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT16646CTPVC 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 CY74FCT16646CTPVC reliable?
The price and inventory of CY74FCT16646CTPVC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT16646CTPVC is usually 5 days.
3.What payment methods are accepted for CY74FCT16646CTPVC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT16646CTPVC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT16646CTPVC?
CY74FCT16646CTPVC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT16646CTPVC 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 CY74FCT16646CTPVC?
For technical support, including CY74FCT16646CTPVC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT16646CTPVC requirements.
6.How does Aetrix verify that CY74FCT16646CTPVC is sourced from the original manufacturer or authorized distributors?
All CY74FCT16646CTPVC 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 CY74FCT16646CTPVC meets industry standards.
7.What is the process for return or replacement of CY74FCT16646CTPVC?
All CY74FCT16646CTPVC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT16646CTPVC, 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 CY74FCT16646CTPVC part is unused and in its original packaging.
Return procedure for CY74FCT16646CTPVC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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