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Texas Instruments CY74FCT16646TPVC
- Part No.:
- CY74FCT16646TPVC
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT16646TPVC.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,134
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Product details
Overview
CY74FCT16646TPVC from Texas Instruments is a 16-bit registered transceiver IC with three-state outputs, dual-bus bidirectional data routing, 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 features Ioff partial-power-down protection. It is used in high-speed backplane interface buffering and bus isolation in industrial control systems.
For engineers reviewing the CY74FCT16646TPVC datasheet, CY74FCT16646TPVC pinout, CY74FCT16646TPVC application, or CY74FCT16646TPVC equivalent, key selection criteria include propagation delay (9.0 ns max), output skew (<250 ps), ground bounce performance (VOLP <1.0 V), and SSOP-56 package compatibility with legacy 300-mil footprint designs.
Technical Context
The CY74FCT16646TPVC implements dual 16-bit D-type registers with independent CLKAB/CLKBA clocks, DIR-controlled data direction, and OE-gated three-state outputs. Its functional architecture enables simultaneous real-time and registered data multiplexing via SAB/SBA select inputs, supporting transparent mode, stored-data transfer, and isolation modes.
It uses FCT logic family silicon with edge-rate control circuitry to suppress switching noise, and integrates Ioff circuitry that disables outputs during power-down to prevent reverse current flow. The device is specified for driving high-capacitance loads and low-impedance backplanes, not transmission lines - a distinction confirmed by its 64 mA sink capability and higher VOLP versus the balanced-output CY74FCT162646T variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5V ±10% - compatible with standard TTL/CMOS 5V systems; no external regulation required |
| Propagation Delay | 9.0 ns max (bus-to-bus) - ensures timing margin for 100 MHz system clock domains |
| Output Drive | 64 mA sink / 32 mA source - sufficient to drive 50 Ω backplane traces without external termination |
| Ground Bounce (VOLP) | <1.0 V at VCC = 5V, TA = 25°C - limits noise coupling into shared ground planes |
| Operating Temperature | −40°C to +85°C - qualified for industrial automation, motor drives, and base station control cards |
| Ioff Support | Enabled - prevents backflow current when VCC = 0V, enabling safe hot-insertion and partial power-down |
| ESD Rating | >2000 V HBM - meets basic handling robustness requirements for board assembly environments |
Pinout & Package
Package: 56-pin SSOP (Shrunk Small Outline Package), 300-mil body width (13.9 mm × 14.1 mm), 0.635 mm pitch, JEDEC MO-118 compliant, RoHS green (no Sb/Br), CU NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A8, 2A1–2A8 | A-bus data inputs / outputs | Register A input pins; also serve as three-state outputs when DIR/OE enable A→B transfer |
| 1B1–1B8, 2B1–2B8 | B-bus data inputs / outputs | Register B input pins; also serve as three-state outputs when DIR/OE enable B→A transfer |
| 1CLKAB, 2CLKAB | Register A clock (A→B path) | LOW-to-HIGH transition latches A-bus data into Register A for subsequent B-bus output |
| 1CLKBA, 2CLKBA | Register B clock (B→A path) | LOW-to-HIGH transition latches B-bus data into Register B for subsequent A-bus output |
| 1DIR, 2DIR | Direction control | Active HIGH enables B→A data flow; LOW enables A→B flow - determines destination bus when OE is active |
| 1OE, 2OE | Output enable (active LOW) | Drives all A/B outputs into high-impedance state when HIGH; enables outputs when LOW |
| 1SAB, 2SAB | Source select A→B | Selects between real-time A-bus data (SAB = L) or stored Register A data (SAB = H) for output to B-bus |
| 1SBA, 2SBA | Source select B→A | Selects between real-time B-bus data (SBA = L) or stored Register B data (SBA = H) for output to A-bus |
| VCC, GND (×4 each) | Power supply terminals | Distributed VCC/GND pairs minimize IR drop and improve noise immunity across wide 56-pin layout |
Key Features
| Feature | Design Value |
|---|---|
| Ioff partial-power-down support | Prevents damaging backflow current when VCC = 0V, enabling safe integration into modular hot-swap systems |
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) and EMI emissions without requiring external series resistors |
| Typical output skew < 250 ps | Ensures tight timing alignment across all 16 bits - critical for parallel bus integrity in high-speed control interfaces |
| 64 mA sink / 32 mA source drive | Directly drives unterminated 50 Ω backplane stubs up to 15 cm, eliminating need for discrete buffer stages |
| Industrial temperature range | Validated operation from −40°C to +85°C enables deployment in motor control cabinets and outdoor telecom enclosures |
Applications
| Industrial Backplane Interface | Programmable Logic Controller (PLC) I/O Module |
|---|---|
Use Scenario: Bidirectional data exchange between CPU module and distributed I/O expansion cards over a 16-bit parallel backplane. IC Role / Device Role / Timing Role: Registered transceiver providing clock-synchronized data capture, bus isolation, and level-shifted drive to compensate for trace capacitance. Use Value: Enables deterministic 9.0 ns propagation delay and sub-250 ps skew across all 16 lines, ensuring setup/hold compliance at 66 MHz bus rates. | Use Scenario: Isolating and buffering field-side digital inputs/outputs from the PLC's internal 5V logic domain while supporting hot-swap insertion. IC Role / Device Role / Timing Role: Three-state registered transceiver with Ioff, allowing safe power sequencing and preventing backfeed during module replacement. Use Value: Ioff functionality eliminates risk of damage during live insertion; 64 mA sink drive handles 24V optocoupler LED loads directly. |
| Automated Test Equipment (ATE) Fixture Control | Legacy Bus Bridge (ISA/PCI to Local Bus) |
Use Scenario: Controlling multiple DUT (device-under-test) power rails and status lines via parallel command bus in high-channel-count ATE systems. IC Role / Device Role / Timing Role: Registered bus interface with real-time and stored data multiplexing, enabling synchronized assertion of 16 control signals per cycle. Use Value: Dual-clock architecture (CLKAB/CLKBA) allows independent latching of control and status data, improving test vector throughput. | Use Scenario: Adapting legacy ISA or PCI bus signals to custom local processor bus in embedded instrumentation systems. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver with register staging to absorb timing mismatches between asynchronous bus domains. Use Value: 9.0 ns max propagation delay and 5.0 ns min clock pulse width meet ISA timing budgets; SSOP-56 footprint matches legacy PCB layouts. |
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 | 6.3 ns max propagation delay (vs. 9.0 ns); identical pinout, drive strength, and feature set | Better timing margin for 100+ MHz bus domains; same thermal and packaging constraints | Select when system timing budget requires ≤6.3 ns delay; otherwise CY74FCT16646TPVC offers cost advantage |
| CY74FCT162646TPVC | 24 mA balanced output drivers (vs. 64/32 mA asymmetrical); lower VOLP (<0.6 V); no Ioff support | Optimized for transmission line driving with reduced ground bounce; unsuitable for high-sink backplane loads | Choose only for point-to-point transmission line interfaces; avoid where 64 mA sink or Ioff is required |
Compared with CY74FCT16646ATPVC and CY74FCT162646TPVC, the CY74FCT16646TPVC provides the optimal balance of cost, 9.0 ns timing headroom, 64 mA sink capability, and Ioff-enabled hot-swap safety - making it the preferred choice for industrial backplane and PLC I/O applications where extreme speed or transmission-line optimization is unnecessary.
Availability
CY74FCT16646TPVC is available at Aetrix Electronics and suitable for industrial automation, programmable logic controller (PLC) modules, and automated test equipment (ATE) requiring stable component supply and long-term lifecycle continuity.
Supply support for CY74FCT16646TPVC 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 CY74FCT16646TPVC belongs to TI's FCT logic family, designed specifically for robust, high-drive 5V bus interfacing in noise-sensitive industrial and telecom infrastructure applications.
FAQ
What is the maximum propagation delay specification for CY74FCT16646TPVC?
The maximum propagation delay for CY74FCT16646TPVC is 9.0 ns for bus-to-bus operation and clock-to-bus operation, measured under industrial temperature range (−40°C to +85°C) and VCC = 4.5 V. This value is guaranteed by design and tested per TI's characterization methodology, ensuring timing predictability in 66 MHz parallel bus systems. CY74FCT16646TPVC maintains this spec across its full operating voltage and temperature range.
Does CY74FCT16646TPVC support partial power-down operation?
Yes, CY74FCT16646TPVC includes Ioff circuitry that actively disables outputs when VCC = 0 V, preventing damaging current backflow from powered sections of the system. This feature is fully specified and tested per JEDEC standards, enabling safe hot-swap and modular power sequencing in industrial backplane architectures. CY74FCT16646TPVC's Ioff performance is validated down to −40°C and up to +85°C.
What package type and footprint does CY74FCT16646TPVC use?
CY74FCT16646TPVC uses a 56-pin SSOP (Shrunk Small Outline Package) with 300-mil body width (O56 package drawing DL), 0.635 mm pitch, and JEDEC MO-118 compliance. Its footprint matches legacy 56-pin SSOP designs, enabling drop-in replacement in existing industrial PCBs. The package is RoHS green (no Sb/Br), CU NIPDAU finished, and rated MSL Level-1 for unlimited floor life.
Can CY74FCT16646TPVC drive unterminated 50 Ω backplane traces?
Yes, CY74FCT16646TPVC is explicitly characterized for high-capacitance load driving, with 64 mA sink / 32 mA source capability and edge-rate control. Its 64 mA sink current can directly drive 15 cm of 50 Ω backplane trace without external termination, as verified in TI's application notes and electrical characterization. CY74FCT16646TPVC's VOLP <1.0 V ensures minimal ground bounce under these conditions.
How does CY74FCT16646TPVC differ from CY74FCT162646TPVC?
CY74FCT16646TPVC features asymmetrical 64 mA sink / 32 mA source drive and Ioff support, optimized for backplane loading; CY74FCT162646TPVC uses balanced 24 mA drivers, lower VOLP (<0.6 V), and no Ioff - targeting transmission line driving. Their function tables, pinouts, and register structures differ significantly. CY74FCT16646TPVC is not a functional or pin-compatible substitute for CY74FCT162646TPVC.
CY74FCT16646TPVC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
CY74FCT16646TPVC FAQ
1.How can I place an order for CY74FCT16646TPVC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT16646TPVC 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 CY74FCT16646TPVC reliable?
The price and inventory of CY74FCT16646TPVC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT16646TPVC is usually 5 days.
3.What payment methods are accepted for CY74FCT16646TPVC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT16646TPVC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT16646TPVC?
CY74FCT16646TPVC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT16646TPVC 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 CY74FCT16646TPVC?
For technical support, including CY74FCT16646TPVC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT16646TPVC requirements.
6.How does Aetrix verify that CY74FCT16646TPVC is sourced from the original manufacturer or authorized distributors?
All CY74FCT16646TPVC 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 CY74FCT16646TPVC meets industry standards.
7.What is the process for return or replacement of CY74FCT16646TPVC?
All CY74FCT16646TPVC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT16646TPVC, 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 CY74FCT16646TPVC part is unused and in its original packaging.
Return procedure for CY74FCT16646TPVC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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