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Texas Instruments 74ACT16646DLR
- Part No.:
- 74ACT16646DLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16646DLR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,308
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Product details
Overview
74ACT16646DLR from Texas Instruments is a 16-bit bus transceiver and register IC with 3-state outputs, TTL-voltage-compatible inputs, independent A/B bus registers, and multiplexed real-time/stored data routing. It operates from –40°C to 85°C at 4.5–5.5 V, supports up to 90 MHz clock frequency, and is packaged in a 56-pin SSOP (DL) for high-density PCB layouts.
For engineers reviewing the 74ACT16646DLR datasheet, 74ACT16646DLR pinout, 74ACT16646DLR application, or 74ACT16646DLR equivalent, key selection criteria include its dual-register architecture, flow-through layout optimization, distributed VCC/GND pinning for noise reduction, and support for real-time or stored-data transfer between 16-bit buses in industrial control and legacy system upgrades.
Technical Context
The 74ACT16646DLR implements two independent 8-bit D-type flip-flop banks (A and B), each with dedicated clock (CLKAB/CLKBA), direction (DIR), output-enable (OE), and select (SAB/SBA) controls. Its logic eliminates decoding glitches during transitions between transparent and stored data modes.
It uses TI's EPIC 1-μm CMOS process, delivers ±24 mA output drive, achieves tPLH/tPHL ≤ 12.2 ns (max), and features distributed power/ground pins across all four sides to minimize simultaneous switching noise in high-speed bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and CMOS systems without level-shifting. |
| Operating Temperature | –40°C to +85°C - Qualified for commercial and industrial ambient environments, not extended military range. |
| Max Clock Frequency | 90 MHz - Enables high-throughput data handshaking in backplane and memory-mapped I/O interfaces. |
| Output Drive | ±24 mA - Sufficient to drive multiple TTL loads or terminate short stubs on parallel buses without external buffers. |
| Propagation Delay | tPHL/tPLH ≤ 12.2 ns - Supports sub-10-ns timing margins in 80-MHz synchronous bus designs. |
| I/O Capacitance | Cio = 12 pF - Low capacitance minimizes signal degradation and reflection on densely routed 16-bit buses. |
| Latch-Up Immunity | 500 mA typical at 125°C - Robust against transient current surges in noisy industrial power domains. |
Pinout & Package
74ACT16646DLR is housed in a 56-pin Shrink Small-Outline Package (SSOP, DL), 300-mil body width, 0.025-inch pin pitch, RoHS-compliant NIPDAU finish, MSL Level-1 (unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input | Determines bus flow direction (A→B or B→A) when OE is active low; enables bidirectional data routing per register bank. |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Register clock inputs | Clock data into A or B registers on rising edge; allows independent latching of each 8-bit bus segment. |
| 1SAB, 2SAB, 1SBA, 2SBA | Select control inputs | Choose between real-time (transparent) or stored data output without glitching during mode transitions. |
| 1OE, 2OE | Output-enable inputs | Enable/disable 3-state outputs independently per register bank; high = high-impedance isolation. |
| A1–A8, B1–B8 (×2 banks) | Bus I/O terminals | 16-bit bidirectional data paths (A and B); inputs remain active even when outputs are disabled for storage. |
| VCC, GND (×8 total) | Power and ground | Distributed VCC/GND pins reduce simultaneous switching noise and improve signal integrity on high-speed buses. |
Key Features
| Feature | Design Value |
|---|---|
| Independent A/B register banks | Enables concurrent latching and routing of two 8-bit data streams-critical for dual-bus arbitration in controller co-processing. |
| Glitch-free multiplexed output select | SAB/SBA control eliminates metastability and decoding spikes during real-time ↔ stored data switching-ensures deterministic bus behavior. |
| Flow-through pin architecture | Minimizes trace length and layer transitions on PCBs, reducing skew and EMI in 16-bit parallel interfaces. |
| TTL-voltage-compatible inputs | Accepts standard 0.8 V / 2.0 V logic thresholds-interoperates directly with legacy 74LS, 74ALS, and microcontroller GPIOs. |
| EPIC 1-μm CMOS process | Delivers high speed with low static power (ICC ≤ 80 μA typical) and robust latch-up immunity (500 mA @ 125°C). |
Applications
| Industrial PLC Backplane Interface | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Interfacing a modern ARM-based controller to an aging 16-bit ISA-style backplane with isolated address/data buses. IC Role / Device Role / Timing Role: Acts as a buffered, registered transceiver that isolates timing domains while preserving data integrity across voltage and speed boundaries. Use Value: Eliminates need for discrete latches and bus buffers; supports 90-MHz burst transfers while maintaining setup/hold compliance with slow peripherals. |
Use Scenario: Upgrading a 1990s test equipment mainframe with new FPGA-based modules requiring synchronized access to shared memory and I/O space. IC Role / Device Role / Timing Role: Provides dual-register staging for A/B buses, enabling seamless handoff between real-time sensor reads and preloaded command sequences. Use Value: Reduces FPGA logic utilization by offloading bus arbitration and data staging-cuts design cycle time for legacy interoperability. |
| Automated Test Equipment (ATE) Data Switching | Redundant Control Bus Arbitration |
|
Use Scenario: Routing high-speed digital stimulus patterns from multiple pattern generators to DUT pins in parallel test fixtures. IC Role / Device Role / Timing Role: Functions as a programmable 16-bit multiplexer with storage, allowing pattern preloading and glitch-free switching mid-test. Use Value: Achieves sub-10-ns channel-to-channel skew and eliminates test interruption during source changes-improves test throughput by >15%. |
Use Scenario: Managing failover between primary and backup control buses in safety-critical rail signaling hardware. IC Role / Device Role / Timing Role: Stores critical state data on both A and B buses simultaneously, then routes validated outputs under DIR/OE control during switchover. Use Value: Guarantees zero-cycle data loss during redundancy transition-meets SIL-2 timing determinism requirements. |
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 |
|---|---|---|---|
| 74ACT16245DLR | Non-registering 16-bit transceiver; no internal storage or clock inputs-only real-time pass-through. | Suitable only where buffering without latching is required; cannot replace stored-data multiplexing functions. | Select when latency minimization is critical and bus synchronization is handled externally. |
| SN74LVTH16646DGGR | Lower-voltage (3.3 V) LVTH family; higher drive (±64 mA), but incompatible with 5-V TTL input thresholds. | Requires level translation for legacy 5-V systems; better suited for mixed-voltage 3.3/5-V hybrid boards. | Choose only if migrating toward 3.3-V core logic and adding translation circuitry is acceptable. |
Compared with 74ACT16646DLR, the 74ACT16245DLR lacks register functionality and clock control-making it unsuitable for stored-data multiplexing-while the SN74LVTH16646DGGR trades 5-V TTL compatibility for higher drive and lower voltage operation, requiring redesign of interface logic.
Availability
74ACT16646DLR is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy system bus extensions, automated test equipment, and redundant control bus architectures requiring stable component supply, long-lifecycle support, and guaranteed SSOP package continuity.
Supply support for 74ACT16646DLR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74ACT16646DLR belongs to TI's Widebus™ family of high-speed bus interface ICs, designed specifically for reliable, low-noise data transfer in legacy and upgrade-focused industrial control systems.
FAQ
What is the maximum operating frequency of the 74ACT16646DLR?
The 74ACT16646DLR supports a maximum clock frequency of 90 MHz across its recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to +85°C). This rating applies to both CLKAB and CLKBA inputs and is verified by TI's switching characteristics table under typical and worst-case timing limits.
Does the 74ACT16646DLR support true bidirectional data flow on the same bus lines?
Yes-the 74ACT16646DLR supports bidirectional operation via DIR-controlled routing: when DIR is low, data flows from B to A; when high, from A to B. Each direction path includes independent 3-state outputs, allowing dynamic reversal without external bus switches or direction logic.
Can the 74ACT16646DLR operate with 3.3-V logic inputs?
No-the 74ACT16646DLR requires TTL-voltage-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and is specified only for 4.5–5.5 V VCC. Applying 3.3-V signals risks marginal or non-functional operation; level translation is mandatory for interfacing with 3.3-V controllers.
How many power and ground pins does the 74ACT16646DLR have, and why?
The 74ACT16646DLR has eight dedicated VCC and GND pins distributed across all four sides of its 56-pin SSOP package. This layout minimizes high-speed switching noise by reducing inductance in power delivery paths and improving decoupling effectiveness for clean 16-bit bus signaling.
Is the 74ACT16646DLR pin-compatible with the 54ACT16646WD?
No-the 74ACT16646DLR uses a 56-pin SSOP (DL) package, while the 54ACT16646WD uses a 56-pin ceramic flat pack (WD) with different mechanical dimensions, thermal characteristics, and solder profile requirements. Though functionally identical, they are not mechanically interchangeable on PCBs.
74ACT16646DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
74ACT16646DLR FAQ
1.How can I place an order for 74ACT16646DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16646DLR 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 74ACT16646DLR reliable?
The price and inventory of 74ACT16646DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16646DLR is usually 5 days.
3.What payment methods are accepted for 74ACT16646DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16646DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT16646DLR?
74ACT16646DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16646DLR 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 74ACT16646DLR?
For technical support, including 74ACT16646DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16646DLR requirements.
6.How does Aetrix verify that 74ACT16646DLR is sourced from the original manufacturer or authorized distributors?
All 74ACT16646DLR 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 74ACT16646DLR meets industry standards.
7.What is the process for return or replacement of 74ACT16646DLR?
All 74ACT16646DLR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16646DLR, 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 74ACT16646DLR part is unused and in its original packaging.
Return procedure for 74ACT16646DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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