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Texas Instruments 74FCT16646ATPVCG4
- Part No.:
- 74FCT16646ATPVCG4
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74FCT16646ATPVCG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,521
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Product details
Overview
74FCT16646ATPVCG4 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 64 mA sink / 32 mA source drive strength, 6.3 ns max propagation delay (bus-to-bus), and operates at 5V ±10% across −40°C to +85°C. It is used in high-speed backplane interface and bus isolation applications in industrial control systems.
For engineers reviewing the 74FCT16646ATPVCG4 datasheet, 74FCT16646ATPVCG4 pinout, 74FCT16646ATPVCG4 application, or 74FCT16646ATPVCG4 equivalent, this page delivers verified functional architecture, real-time vs. registered mode behavior, Ioff partial-power-down support, edge-rate controlled noise performance, and SSOP-56 package–specific timing and drive capability data.
Technical Context
The 74FCT16646ATPVCG4 implements dual 16-bit D-type registers with independent CLKAB/CLKBA clocks, DIR-controlled data direction, and OE-gated three-state outputs. Its logic supports simultaneous storage from A/B buses and multiplexed output selection via SAB/SBA controls - enabling transparent (real-time) or registered (clocked) data transfer between buses.
It integrates Ioff circuitry for live insertion and partial-power-down operation, and uses edge-rate control to limit ground bounce (typical VOLP < 1.0 V) and improve signal integrity on high-capacitance loads. The device is not a level shifter and requires 5V-only supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5 V ±10% - fixed single-supply operation; no 3.3 V or mixed-voltage support. |
| Propagation Delay | 6.3 ns max (bus-to-bus) - enables reliable 160 MHz bus handshaking in synchronous systems. |
| Output Drive | 64 mA sink / 32 mA source - sufficient to drive 50 Ω transmission lines or high-capacitance backplanes without external buffers. |
| Operating Temp | −40°C to +85°C - qualified for industrial environments including factory automation and motor control cabinets. |
| Ioff Support | Yes - prevents backflow current when VCC = 0 V, enabling hot-swap and power sequencing in modular systems. |
| ESD Rating | >2000 V HBM - meets basic handling robustness requirements for board assembly and field service. |
| Input Capacitance | 6.0 pF max - low loading preserves signal rise/fall times on dense PCB traces. |
Pinout & Package
74FCT16646ATPVCG4 is housed in a 56-pin SSOP (Shrink Small Outline Package), 300-mil body width, 0.635 mm pitch, JEDEC MO-118 compliant. Package dimensions: 13.9 × 5.6 × 1.75 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A8, 2A1–2A8 | A-bus data inputs / B-bus data outputs | Eight-bit groups forming 16-bit A-side I/O; direction determined by DIR and OE state. |
| 1B1–1B8, 2B1–2B8 | B-bus data inputs / A-bus data outputs | Eight-bit groups forming 16-bit B-side I/O; complements A-side for full bidirectional flow. |
| 1CLKAB, 2CLKAB | Register clock (A→B) | Positive-edge-triggered latch control for storing A-bus data into B-register. |
| 1CLKBA, 2CLKBA | Register clock (B→A) | Positive-edge-triggered latch control for storing B-bus data into A-register. |
| 1DIR, 2DIR | Data direction control | Active-HIGH selects B→A transfer; LOW selects A→B transfer when OE is active. |
| 1OE, 2OE | Output enable (active LOW) | Disables all A/B outputs to high-impedance when HIGH; enables output drivers when LOW. |
| 1SAB, 2SAB | Source select (A→B path) | Selects real-time A-bus or stored A-register data for output onto B-bus. |
| 1SBA, 2SBA | Source select (B→A path) | Selects real-time B-bus or stored B-register data for output onto A-bus. |
| VCC, GND (×4 each) | Power distribution | Dedicated supply/ground pairs per functional block reduce switching noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ioff partial-power-down | Enables safe insertion into live backplanes by disabling outputs and blocking reverse current when unpowered. |
| Edge-rate controlled outputs | Reduces ground bounce (VOLP < 1.0 V) and EMI, critical for stable operation on shared power planes. |
| Two independent 8-bit register banks | Allows concurrent storage of A- and B-bus data, supporting ping-pong buffering and asynchronous domain bridging. |
| Real-time + registered mode multiplexing | SAB/SBA pins select between live bus data or latched register contents - eliminates need for external mux logic. |
| Industrial temperature range | Validated operation from −40°C to +85°C ensures reliability in non-climate-controlled enclosures and motor drives. |
Applications
| Backplane Data Isolation | Modular PLC I/O Expansion |
|---|---|
Use Scenario: Isolating CPU bus from peripheral expansion slots in ruggedized industrial backplanes. IC Role / Device Role / Timing Role: Bidirectional registered transceiver providing clock-synchronized data handoff between isolated voltage domains. Use Value: Prevents bus contention during hot-plug events and reduces ground bounce-induced errors on long parallel traces. | Use Scenario: Adding analog/digital I/O modules to programmable logic controllers via standardized carrier boards. IC Role / Device Role / Timing Role: Bus interface IC that buffers and registers sensor/actuator data between controller and module ASICs. Use Value: Enables deterministic sampling windows and eliminates metastability risk during multi-cycle read/write sequences. |
| High-Speed Test Equipment Bus Interface | Legacy System Bus Translation |
Use Scenario: Interfacing FPGA-based pattern generators to legacy 16-bit parallel test fixtures with strict setup/hold timing. IC Role / Device Role / Timing Role: Registered transceiver providing precise clock-aligned data capture and output staging. Use Value: Meets sub-10 ns timing windows required for 100+ MHz digital stimulus generation without external timing logic. | Use Scenario: Bridging modern microcontroller buses to older ISA or VME-style peripheral cards requiring 5V TTL-compatible signaling. IC Role / Device Role / Timing Role: Level-consistent bidirectional bus repeater with register hold capability for protocol adaptation. Use Value: Maintains signal integrity across mismatched trace lengths and allows software-controlled data staging to match legacy handshake protocols. |
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 |
|---|---|---|---|
| 74FCT16646CTPVCG4 | 5.4 ns max propagation delay (vs. 6.3 ns); identical pinout, drive strength, and feature set. | Better timing margin for higher-frequency bus cycles (e.g., >150 MHz sustained transfers). | Select when system-level timing analysis shows slack < 1 ns at target clock rate. |
| 74FCT162646ATPVCG4 | 24 mA balanced output drivers; lower ground bounce (VOLP < 0.6 V); reduced switching noise. | Optimized for transmission-line driving (e.g., point-to-point LV-TTL links), not high-current backplanes. | Select when interconnect is unterminated or impedance-controlled, and noise immunity outweighs drive strength needs. |
Compared with 74FCT16646CTPVCG4, the 74FCT16646ATPVCG4 trades 0.9 ns of speed margin for broader availability and cost efficiency; compared with 74FCT162646ATPVCG4, it provides 2.7× higher sink current but less noise-optimized edge control - making it preferable for legacy backplane upgrades over new low-noise link designs.
Availability
74FCT16646ATPVCG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, modular PLC I/O expansion, and high-speed test equipment bus interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for 74FCT16646ATPVCG4 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 experience in industrial-grade interface ICs.
The FCT logic family - including the 74FCT16646ATPVCG4 - was designed specifically for robust 5V bus interfacing in harsh industrial and telecom infrastructure environments, emphasizing noise immunity, power-down safety, and timing predictability.
FAQ
What is the maximum clock frequency supported by the 74FCT16646ATPVCG4?
The 74FCT16646ATPVCG4 does not specify a maximum clock frequency directly, but its 6.3 ns max propagation delay and 5.0 ns minimum clock pulse width imply reliable operation up to approximately 160 MHz in bus-to-bus mode. Actual usable frequency depends on system-level setup/hold timing, trace length, and load capacitance - design validation at target speed is required. The 74FCT16646ATPVCG4 is not rated for continuous 200 MHz operation.
Does the 74FCT16646ATPVCG4 support 3.3 V logic levels?
No, the 74FCT16646ATPVCG4 is a 5V-only device with VCC = 5 V ±10% and input thresholds defined for TTL-compatible levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V). It lacks internal level-shifting and will not reliably interface with 3.3 V CMOS or LVTTL systems without external translation. Using it with 3.3 V signals risks incorrect logic interpretation or excessive input current.
How does the Ioff feature function in the 74FCT16646ATPVCG4 during power-down?
The Ioff feature in the 74FCT16646ATPVCG4 disables all output buffers when VCC = 0 V, preventing current backflow from live A/B buses into the unpowered IC. This protects downstream circuitry and enables safe hot-swap in modular chassis. Ioff is automatic and requires no external control - it activates whenever VCC drops below ~0.8 V, per TI characterization data.
Can the 74FCT16646ATPVCG4 operate in transparent (non-registered) mode?
Yes, the 74FCT16646ATPVCG4 supports transparent mode via its SAB/SBA select inputs. When SAB = HIGH and SBA = HIGH, real-time data passes directly from A-bus to B-bus or B-bus to A-bus (depending on DIR), bypassing the registers. Clock edges still latch data, but output reflects instantaneous bus state - useful for debugging or low-latency paths where registration is unnecessary.
What is the thermal resistance (θJA) of the 74FCT16646ATPVCG4 in SSOP-56 package?
Texas Instruments does not publish θJA for the 74FCT16646ATPVCG4 in official datasheets or packaging addenda. Thermal performance depends heavily on PCB layout - including copper area, layer count, and airflow. For worst-case junction temperature estimation, use the 1.0 W absolute maximum power dissipation rating and assume θJA ≈ 70–90°C/W for standard 2-layer boards with minimal copper; actual values require IR measurement or simulation with the specific board stack-up.
74FCT16646ATPVCG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
74FCT16646ATPVCG4 FAQ
1.How can I place an order for 74FCT16646ATPVCG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT16646ATPVCG4 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 74FCT16646ATPVCG4 reliable?
The price and inventory of 74FCT16646ATPVCG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT16646ATPVCG4 is usually 5 days.
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4.How is shipping managed for 74FCT16646ATPVCG4?
74FCT16646ATPVCG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT16646ATPVCG4 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 74FCT16646ATPVCG4?
For technical support, including 74FCT16646ATPVCG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT16646ATPVCG4 requirements.
6.How does Aetrix verify that 74FCT16646ATPVCG4 is sourced from the original manufacturer or authorized distributors?
All 74FCT16646ATPVCG4 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 74FCT16646ATPVCG4 meets industry standards.
7.What is the process for return or replacement of 74FCT16646ATPVCG4?
All 74FCT16646ATPVCG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT16646ATPVCG4, 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 74FCT16646ATPVCG4 part is unused and in its original packaging.
Return procedure for 74FCT16646ATPVCG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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