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Texas Instruments 74ACT16648DL
- Part No.:
- 74ACT16648DL
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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74ACT16648DL.pdf
- Description:
- REGISTERED BUS TRANSCEIVER
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Product details
Overview
74ACT16648DL from Texas Instruments is a 16-bit advanced CMOS bus transceiver with dual independent 8-bit registers, inverting data path, flow-through architecture, and TTL-voltage-compatible inputs. It operates from −40°C to 85°C at 4.5–5.5 V supply, supports real-time and stored data multiplexing, and is used in high-speed backplane and board-level bus management systems.
For engineers reviewing the 74ACT16648DL datasheet, 74ACT16648DL pinout, 74ACT16648DL application, or 74ACT16648DL equivalent, this device enables flexible bidirectional data routing between A/B buses with glitch-free select control, clocked storage, and isolation modes-critical for synchronous bus arbitration in industrial control and telecom interface designs.
Technical Context
The 74ACT16648DL implements two independent 8-bit D-type flip-flop sections (1A/1B and 2A/2B), each with dedicated CLKAB/CLKBA clocks, DIR direction control, OE output enable, and SAB/SBA select inputs. Its inverting data path ensures signal polarity consistency across register-to-bus transfers.
It uses TI's EPIC 1-µm CMOS process with distributed VCC/GND pins to suppress switching noise, supports up to 75 MHz clock frequency, and features flow-through logic that eliminates internal feedback paths-optimizing PCB layout by aligning input and output pins on opposite sides of the DL package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL and CMOS logic rails |
| Operating Temperature | −40°C to +85°C - qualified for commercial and industrial ambient environments |
| Max Clock Frequency | 75 MHz - enables high-throughput synchronous bus transfer in real-time systems |
| Output Drive | ±24 mA - sufficient to drive multiple TTL loads or short PCB traces without buffering |
| Propagation Delay | tPLH/tPHL ≤ 11 ns - ensures timing margin in 10-ns clock domains |
| Input Compatibility | TTL-voltage level - accepts standard 0.8 V / 2.0 V logic thresholds directly |
| Power Dissipation | 1.4 W max at 55°C (DL package) - defines thermal derating limits for dense layouts |
Pinout & Package
74ACT16648DL is housed in a 56-pin plastic shrink small-outline (DL) package with 300-mil body width and 25-mil center-to-center pin pitch. The pin layout supports flow-through routing: A-side I/Os occupy one half, B-side I/Os the other, with control signals distributed across top/bottom edges to minimize layer crossings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input | Determines bus direction per section: DIR = L routes B→A; DIR = H routes A→B |
| 1CLKAB, 2CLKAB | Register clock (A→B) | Low-to-high transition latches A-bus data into internal register for later B-bus output |
| 1CLKBA, 2CLKBA | Register clock (B→A) | Low-to-high transition latches B-bus data into internal register for later A-bus output |
| 1SAB, 2SAB | Select control (A→B path) | SAB = L enables real-time A→B transfer; SAB = H enables stored-A→B transfer |
| 1SBA, 2SBA | Select control (B→A path) | SBA = L enables real-time B→A transfer; SBA = H enables stored-B→A transfer |
| 1OE, 2OE | Output enable | OE = H disables outputs (high-Z); OE = L enables output drivers per section |
| A1–A8, B1–B8 (×2 sections) | Bidirectional data I/O | True bidirectional ports: input when driver disabled, output when enabled and DIR set |
| VCC, GND (×8 total) | Power distribution | Distributed VCC/GND pins reduce simultaneous switching noise and improve signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual 8-bit registers | Enables concurrent storage and routing of two data streams without cross-talk or arbitration delay |
| Glitch-free multiplexed select control | Eliminates decoding glitches during transitions between real-time and stored data modes |
| Flow-through architecture | Aligns A- and B-side pins on opposite package edges-reducing layer count and trace length in PCB layout |
| Distributed power/ground pins | Minimizes high-speed switching noise and improves EMI performance in dense digital systems |
| Inverting data path | Maintains consistent signal polarity across register-to-bus transfers, simplifying timing analysis |
Applications
| Backplane Bus Arbitration | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Managing shared data paths between CPU and multiple I/O modules in modular control chassis. IC Role / Device Role / Timing Role: Bidirectional bus transceiver with clocked storage, enabling time-sliced access to common backplane without contention. Use Value: Eliminates external glue logic for bus hold/isolation; supports deterministic latency via synchronized CLKAB/CLKBA edges. |
Use Scenario: Interfacing fieldbus controllers (e.g., Profibus DP masters) with local sensor/actuator banks. IC Role / Device Role / Timing Role: Isolating and buffering serial or parallel control data between isolated voltage domains while preserving timing alignment. Use Value: Enables hot-swap-safe data capture via OE-controlled high-Z state and DIR-gated direction switching. |
| Telecom Line Card Interface | Test Equipment Data Capture |
Use Scenario: Routing configuration and status data between DSP subsystems and FPGA-based packet processors on line cards. IC Role / Device Role / Timing Role: Multiplexed transceiver supporting both live traffic monitoring and stored diagnostic data injection. Use Value: SAB/SBA select lines allow seamless switching between real-time and preloaded test patterns without clock interruption. |
Use Scenario: Capturing parallel bus waveforms from DUTs under controlled clock edges in automated test fixtures. IC Role / Device Role / Timing Role: High-speed latch-and-forward element capturing A/B bus states on precise CLKAB/CLKBA rising edges. Use Value: ±24 mA drive strength and 11 ns propagation delay ensure clean sampling of 75-MHz bus activity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT16245DL | No internal registers; transparent non-latching operation only; lacks SAB/SBA select and CLKAB/CLKBA inputs | Suitable for simple level-shifting or bus driving where storage/multiplexing is unnecessary | Choose when deterministic storage, real-time/stored mode switching, or clocked arbitration is not required |
| SN74LVTH16646DL | Lower voltage (3.3 V), higher drive (±64 mA), but no SAB/SBA select logic; uses different control scheme (OE + DIR only) | Targeted for 3.3-V LVT systems with higher fanout needs, but cannot replicate multiplexed stored/real-time behavior | Choose only for 3.3-V designs requiring greater current drive and where register multiplexing is handled externally |
Compared with 74ACT16648DL, 74ACT16245DL omits all storage and select functionality-reducing complexity but eliminating bus arbitration capability-while SN74LVTH16646DL trades 5-V compatibility and multiplexed operation for 3.3-V efficiency and higher drive, making it unsuitable as a drop-in replacement.
Availability
74ACT16648DL is available at Aetrix Electronics and suitable for industrial control backplanes, telecom line card interfaces, and automated test equipment requiring stable component supply, long-term obsolescence management, and verified legacy logic sourcing.
Supply support for 74ACT16648DL 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 heritage in high-reliability industrial and communications ICs.
The 74ACT16648DL belongs to TI's Widebus™ family of advanced CMOS bus interface devices, designed specifically for high-speed, low-noise, multi-drop bus management in demanding industrial and telecom infrastructure applications.
FAQ
What is the maximum operating frequency of the 74ACT16648DL?
The 74ACT16648DL supports a maximum clock frequency of 75 MHz under recommended operating conditions (VCC = 5 V ± 0.5 V, TA = 25°C). This rating applies to both CLKAB and CLKBA inputs and is validated across the full commercial temperature range (−40°C to +85°C), ensuring reliable high-speed bus synchronization in real-time systems.
Does the 74ACT16648DL support true bidirectional operation on each port?
Yes, the 74ACT16648DL provides true bidirectional I/O on all A1–A8 and B1–B8 pins. When OE is low and DIR is asserted, the port drives data in the selected direction; when OE is high, the same pins remain active as inputs-allowing continuous data capture even while outputs are disabled. This behavior is confirmed in the FUNCTION TABLE and logic diagram of the 74ACT16648DL datasheet.
How does the 74ACT16648DL eliminate multiplexer glitches during mode switching?
The 74ACT16648DL uses dedicated select-control circuitry for SAB and SBA inputs that avoids combinatorial decoding hazards. As stated in the datasheet, this design "eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data." The internal path ensures monotonic switching without momentary invalid states-critical for glitch-free bus handoff in synchronous systems using the 74ACT16648DL.
What is the purpose of the distributed VCC and GND pins in the 74ACT16648DL DL package?
The 74ACT16648DL places eight VCC and eight GND pins across the perimeter of its 56-pin DL package to minimize simultaneous switching noise and reduce ground bounce. This distributed power architecture lowers inductance in high-frequency switching paths, stabilizes local supply rails during fast edge transitions, and improves signal integrity-especially important for maintaining timing margins in 75-MHz operation of the 74ACT16648DL.
Can the 74ACT16648DL be used as two independent 8-bit transceivers?
Yes, the 74ACT16648DL is explicitly structured as two independent 8-bit sections (1A/1B and 2A/2B), each with dedicated CLKAB, CLKBA, DIR, OE, SAB, and SBA inputs. The datasheet confirms it "can be used as two 8-bit transceivers or one 16-bit transceiver," allowing separate clocking, direction control, and data storage per section-enabling flexible partitioning in complex bus architectures using the 74ACT16648DL.
74ACT16648DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74ACT16648DL FAQ
1.How can I place an order for 74ACT16648DL through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16648DL 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 74ACT16648DL reliable?
The price and inventory of 74ACT16648DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16648DL is usually 5 days.
3.What payment methods are accepted for 74ACT16648DL?
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4.How is shipping managed for 74ACT16648DL?
74ACT16648DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16648DL 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 74ACT16648DL?
For technical support, including 74ACT16648DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16648DL requirements.
6.How does Aetrix verify that 74ACT16648DL is sourced from the original manufacturer or authorized distributors?
All 74ACT16648DL 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 74ACT16648DL meets industry standards.
7.What is the process for return or replacement of 74ACT16648DL?
All 74ACT16648DL units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16648DL, 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 74ACT16648DL part is unused and in its original packaging.
Return procedure for 74ACT16648DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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