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Texas Instruments CY74FCT16646ATPVCT
- Part No.:
- CY74FCT16646ATPVCT
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT16646ATPVCT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,915
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Product details
Overview
CY74FCT16646ATPVCT from Texas Instruments is a 16-bit registered transceiver with three-state D-type registers, designed for bidirectional data multiplexing between two 16-bit buses (A and B). It supports industrial temperature range (−40°C to +85°C), operates at VCC = 5V ±10%, delivers 64 mA sink / 32 mA source drive strength, and features Ioff partial-power-down protection. It is used in high-speed backplane interface and bus isolation applications requiring low ground bounce (<1.0 V) and fast propagation delay (6.3 ns max).
For engineers reviewing the CY74FCT16646ATPVCT datasheet, CY74FCT16646ATPVCT pinout, CY74FCT16646ATPVCT application, or CY74FCT16646ATPVCT equivalent, this page provides verified functional architecture, real-time vs. registered mode behavior, output skew (<250 ps), noise-suppressed edge-rate control, and SSOP-56 package–specific layout and thermal considerations.
Technical Context
The CY74FCT16646ATPVCT implements dual 16-bit register banks (A and B), clocked by independent CLKAB/CLKBA inputs, with direction-controlled bidirectional data flow governed by DIR and active-low OE. Its internal logic enables simultaneous storage and selective multiplexing of real-time or registered data via SAB/SBA select lines.
It integrates Ioff circuitry to disable outputs during partial power-down, preventing reverse current flow when VCC = 0 V. Output drivers are optimized for high-capacitance loads and low-impedance backplanes, with typical ground bounce <1.0 V at 64 mA sink and 32 mA source under VCC = 5 V, TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5 V ±10% - Enables direct compatibility with legacy 5-V TTL/CMOS systems without level translation. |
| Propagation Delay | 6.3 ns max (CY74FCT16646AT variant) - Ensures timing-critical bus bridging in sub-100 MHz synchronous designs. |
| Output Drive | 64 mA sink / 32 mA source - Supports driving heavy capacitive loads (e.g., >50 pF traces) and unterminated backplanes. |
| Ground Bounce (VOLP) | <1.0 V typical at VCC = 5 V, TA = 25°C - Reduces signal integrity risk in dense PCB layouts with shared ground planes. |
| Operating Temperature | −40°C to +85°C - Qualified for industrial-grade embedded control, test equipment, and telecom infrastructure. |
| Ioff Support | Active at VCC = 0 V - Allows safe hot-insertion and partial system power-down without damaging backdrive currents. |
| ESD Rating | >2000 V HBM - Provides robust handling margin during board assembly and field service. |
Pinout & Package
Package: 56-pin SSOP (Shrink Small Outline Package), 300-mil body width, 0.635 mm pitch, JEDEC MO-118 compliant, RoHS green (Pb-free, no Sb/Br), MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A8, 2A1–2A8 | A-bus data inputs / outputs | Register A side I/O pins; function as inputs when DIR = LOW and OE = LOW (B→A transfer), or outputs when DIR = HIGH and OE = LOW (A→B transfer). |
| 1B1–1B8, 2B1–2B8 | B-bus data inputs / outputs | Register B side I/O pins; mirror A-bus behavior with opposite direction logic; support bidirectional registered or transparent data flow. |
| 1CLKAB, 2CLKAB | Register A clock input | Positive-edge-triggered clock for latching data from B bus into Register A; controls real-time or stored A→B transfers. |
| 1CLKBA, 2CLKBA | Register B clock input | Positive-edge-triggered clock for latching data from A bus into Register B; enables isolated storage and later B→A output. |
| 1DIR, 2DIR | Direction control | Active-HIGH signal selecting data flow direction: DIR = HIGH → A→B; DIR = LOW → B→A. Overrides SAB/SBA in isolation mode. |
| 1OE, 2OE | Output enable (active LOW) | Global three-state control: OE = LOW enables outputs; OE = HIGH places all A/B pins in high-impedance state for bus isolation. |
| 1SAB, 2SAB | Source select A→B | Selects whether A-bus output derives from real-time A input (SAB = LOW) or stored Register B data (SAB = HIGH). |
| 1SBA, 2SBA | Source select B→A | Selects whether B-bus output derives from real-time B input (SBA = LOW) or stored Register A data (SBA = HIGH). |
| VCC, GND (×4 each) | Power and ground terminals | Distributed supply/return pins minimize IR drop and switching noise; require local 0.1 µF ceramic decoupling per VCC–GND pair. |
Key Features
| Feature | Design Value |
|---|---|
| Ioff partial-power-down | Prevents back-current flow when VCC = 0 V, enabling safe integration in mixed-voltage or hot-swap subsystems. |
| Edge-rate controlled outputs | Reduces EMI and crosstalk in high-density routing by limiting slew rate without compromising 6.3 ns propagation speed. |
| Low output skew | <250 ps typical skew across all 32 outputs ensures deterministic timing alignment in parallel bus applications. |
| High noise immunity | Input hysteresis ≥100 mV and VIH/VIL thresholds (2.0 V / 0.8 V) provide robust operation in electrically noisy industrial environments. |
| Industrial temperature rating | Guaranteed functionality from −40°C to +85°C supports deployment in uncontrolled enclosures and outdoor equipment. |
Applications
| Backplane Interface | System Bus Isolation |
|---|---|
|
Use Scenario: Interfacing CPU local bus to extended peripheral backplane with multiple slot loads. IC Role / Device Role / Timing Role: Registered transceiver buffering and isolating address/data/control signals between master and slave slots. Use Value: 64 mA drive strength sustains signal integrity across 12-inch 50-Ω traces; 6.3 ns delay enables ≤80 MHz bus clocking with setup/hold margin. |
Use Scenario: Partitioning a single-board computer into secure and non-secure domains with independent power domains. IC Role / Device Role / Timing Role: Bidirectional data gate with Ioff-enabled isolation during domain power-down sequences. Use Value: Ioff prevents backdrive damage when one domain powers off while the other remains active; OE/DIR control allows software-configurable data path lockdown. |
| Legacy Bus Extension | Test Equipment Signal Routing |
|
Use Scenario: Extending TTL-level ISA or VMEbus segments across modular chassis with long interconnects. IC Role / Device Role / Timing Role: Level-consistent repeater with registered hold capability for timing-critical strobes and handshakes. Use Value: Real-time + registered mode selection (via SAB/SBA) supports both combinatorial handshake propagation and synchronized pipeline staging. |
Use Scenario: Automated test system (ATE) channel matrix routing digital stimulus and response signals between DUT and instruments. IC Role / Device Role / Timing Role: Configurable 16-bit bidirectional switch with on-the-fly direction and source selection. Use Value: Independent CLKAB/CLKBA and DIR/OE allow concurrent capture (A→B) and generation (B→A) on same device, reducing channel count per test head. |
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 |
|---|---|---|---|
| CY74FCT16646CTPVCT | 5.4 ns max propagation delay (vs. 6.3 ns); identical pinout, drive strength, and feature set. | Better suited for higher-frequency bus timing (e.g., ≥100 MHz clock domains) where tighter skew and delay budgets apply. | Select CY74FCT16646CTPVCT when propagation delay <5.5 ns is required; otherwise CY74FCT16646ATPVCT offers optimal cost/performance balance. |
| CY74FCT162646ATPVCT | 24 mA balanced output drivers (vs. 64/32 mA asymmetrical); lower ground bounce (<0.6 V); no Ioff support. | Optimized for transmission-line driving (e.g., point-to-point LV-TTL) rather than backplane fanout; lacks partial-power-down capability. | Choose CY74FCT162646ATPVCT only for impedance-controlled trace routing with external termination; avoid where Ioff or high sink current is needed. |
Compared with CY74FCT16646CTPVCT and CY74FCT162646ATPVCT, the CY74FCT16646ATPVCT uniquely balances moderate speed (6.3 ns), high sink current (64 mA), and Ioff protection-making it the preferred choice for industrial backplane and bus-isolation designs requiring robustness over raw speed or line-driving optimization.
Availability
CY74FCT16646ATPVCT is available at Aetrix Electronics and suitable for industrial control systems, automated test equipment, and legacy bus extension applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CY74FCT16646ATPVCT 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 CY74FCT16646ATPVCT belongs to TI's FCT logic family, engineered for 5-V TTL-compatible systems demanding low noise, high drive strength, and robust power-management features like Ioff.
FAQ
What is the maximum clock frequency supported by CY74FCT16646ATPVCT?
The CY74FCT16646ATPVCT does not specify a maximum clock frequency in its datasheet; instead, it guarantees timing margins via propagation delay (6.3 ns max), setup time (2.0 ns min), and hold time (1.5 ns min). For reliable operation, the minimum clock period must exceed tW (5.0 ns min pulse width) plus tPLH/tPHL, supporting effective clock rates up to ~80 MHz in well-designed layouts with controlled trace lengths and proper termination.
Does CY74FCT16646ATPVCT support hot-swap or partial-power-down operation?
Yes, CY74FCT16646ATPVCT supports partial-power-down via its Ioff circuitry. When VCC = 0 V, the outputs are actively disabled, limiting IOFF leakage to ±1 µA and preventing damaging back-current flow from live buses. This makes CY74FCT16646ATPVCT suitable for hot-plug backplane modules and multi-rail systems where subsystems power up/down independently.
How does the SAB and SBA pin functionality differ between CY74FCT16646ATPVCT and CY74FCT162646ATPVCT?
SAB and SBA operate identically across both devices: SAB selects source for A-bus output (real-time A or stored B), and SBA selects source for B-bus output (real-time B or stored A). However, CY74FCT16646ATPVCT uses these controls in conjunction with its asymmetrical 64/32 mA drivers and Ioff, whereas CY74FCT162646ATPVCT pairs them with balanced 24 mA drivers and no Ioff-altering their suitability for backplane vs. transmission-line use cases.
What is the recommended decoupling strategy for CY74FCT16646ATPVCT?
TI recommends one 0.1 µF ceramic capacitor per VCC–GND pair, placed as close as possible to each power pin. With four VCC and four GND pins distributed across the 56-pin SSOP package, eight localized 0.1 µF X7R capacitors (0603 or 0402) are required. Avoid shared bulk capacitance; use separate vias to internal planes to minimize loop inductance and suppress simultaneous switching noise.
Can CY74FCT16646ATPVCT be used in place of CY74FCT16646TPVCT?
Yes, CY74FCT16646ATPVCT is a direct speed-grade upgrade over CY74FCT16646TPVCT (9.0 ns), sharing identical pinout, package (SSOP-56), supply voltage, and functional logic. The "A" suffix denotes 6.3 ns max propagation delay versus "T" (9.0 ns), enabling higher-speed operation without PCB or firmware changes-provided timing margins in the target design accommodate the faster edge rates.
CY74FCT16646ATPVCT 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
CY74FCT16646ATPVCT FAQ
1.How can I place an order for CY74FCT16646ATPVCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT16646ATPVCT 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 CY74FCT16646ATPVCT reliable?
The price and inventory of CY74FCT16646ATPVCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT16646ATPVCT is usually 5 days.
3.What payment methods are accepted for CY74FCT16646ATPVCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT16646ATPVCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT16646ATPVCT?
CY74FCT16646ATPVCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT16646ATPVCT 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 CY74FCT16646ATPVCT?
For technical support, including CY74FCT16646ATPVCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT16646ATPVCT requirements.
6.How does Aetrix verify that CY74FCT16646ATPVCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT16646ATPVCT 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 CY74FCT16646ATPVCT meets industry standards.
7.What is the process for return or replacement of CY74FCT16646ATPVCT?
All CY74FCT16646ATPVCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT16646ATPVCT, 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 CY74FCT16646ATPVCT part is unused and in its original packaging.
Return procedure for CY74FCT16646ATPVCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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