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Texas Instruments 74ACT16646DL
- Part No.:
- 74ACT16646DL
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16646DL.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,688
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Product details
Overview
74ACT16646DL 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 flow-through architecture optimized for PCB layout. It operates from –40°C to 85°C at 4.5–5.5 V, supports up to 90 MHz clock frequency, and features distributed VCC/GND pins to minimize high-speed switching noise.
For engineers reviewing the 74ACT16646DL datasheet, 74ACT16646DL pinout, 74ACT16646DL application, or 74ACT16646DL equivalent, key selection criteria include real-time/stored data multiplexing capability, dual-clock (CLKAB/CLKBA) control, DIR/OE/SAB/SBA functional logic, and SSOP-56 package compatibility with legacy Widebus designs.
Technical Context
The 74ACT16646DL implements two independent 8-bit D-type flip-flop banks (A and B), each with dedicated clock (CLKAB/CLKBA), select (SAB/SBA), and direction (DIR) controls. Its flow-through architecture enables transparent data transfer while allowing simultaneous storage of A- or B-bus data on clock edges.
It uses TI's EPIC 1-μm CMOS process, delivers ±24 mA output drive, achieves 3.4–5.2 ns propagation delays (tPHL/tPLH), and incorporates glitch-free select logic that eliminates decoding hazards during transitions between real-time and stored data modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 16-bit bidirectional bus transceiver with dual 8-bit storage registers and 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS systems without level-shifting |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing applications |
| Max Clock Frequency | 90 MHz - supports high-speed data routing in backplane and memory interface designs |
| Output Drive | ±24 mA - sufficient to drive multiple TTL loads or stubbed transmission lines |
| Propagation Delay | 3.4–12.2 ns - low-latency performance critical for synchronous bus arbitration |
| Input Compatibility | TTL-voltage - accepts standard 0.8 V / 2.0 V logic thresholds without external biasing |
Pinout & Package
74ACT16646DL is housed in a 56-pin shrink small-outline package (SSOP-DL, 300-mil width), featuring distributed power/ground pins (12× VCC, 12× GND) to suppress simultaneous switching noise in high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input | Determines data flow direction (A→B or B→A) when OE is active; enables isolation mode when OE is high |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Clock input | Low-to-high edge clocks data from A or B bus into respective register; enables real-time or stored-path selection |
| 1SAB, 2SAB, 1SBA, 2SBA | Select control input | Glitch-free multiplexing between real-time (transparent) and stored data paths for A/B buses |
| 1OE, 2OE | Output enable | Active-low control of 3-state outputs; input receivers remain enabled even when outputs are disabled |
| A1–A8, B1–B8 (x2) | Bus I/O terminals | Two independent 8-bit bidirectional ports (A and B); each port supports concurrent input capture and output driving |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Enables direct real-time data pass-through while simultaneously storing prior values - eliminates pipeline stalls in bus arbitration |
| Distributed VCC/GND pinning | 12 power and 12 ground pins reduce simultaneous switching noise and improve signal integrity in high-frequency operation |
| Glitch-free select logic | SAB/SBA control circuitry prevents transient glitches during stored↔real-time data switching - critical for deterministic timing |
| EPIC 1-μm CMOS process | Delivers 500-mA latch-up immunity at 125°C and robust ESD tolerance - suitable for harsh industrial environments |
| TTL-input compatibility | Accepts standard TTL voltage thresholds without pull-ups or level shifters - simplifies integration with legacy logic families |
Applications
| Industrial Backplane Interface | Memory Expansion Subsystem |
|---|---|
Use Scenario: Bidirectional data routing between CPU and peripheral modules across a shared 16-bit backplane with hot-swap capability. IC Role / Device Role / Timing Role: Bus transceiver and register providing isolated, glitch-free data handoff between asynchronous domains while maintaining stored state during reconfiguration. Use Value: Enables real-time data mirroring and stored-data replay during module insertion/removal - avoids bus contention and system reset. | Use Scenario: Extending address/data bus width between microcontroller and parallel SRAM/Flash devices in resource-constrained embedded systems. IC Role / Device Role / Timing Role: 16-bit registered transceiver buffering and synchronizing memory access cycles with precise clock-edge alignment. Use Value: Supports 90-MHz burst transfers and eliminates setup/hold violations via internal register staging - improves memory bandwidth by >30% vs. unregistered buffers. |
| Test Equipment Data Acquisition | Legacy System Bus Bridge |
Use Scenario: Capturing and time-stamping parallel sensor data streams before serial conversion in automated test equipment. IC Role / Device Role / Timing Role: Dual-register transceiver capturing synchronized snapshots of A- and B-bus states on independent clock edges for timestamp correlation. Use Value: Allows concurrent acquisition of control and measurement buses with sub-ns skew - essential for jitter analysis and phase-error measurement. | Use Scenario: Interfacing modern 5-V logic controllers with legacy 16-bit ISA or VMEbus peripherals requiring strict timing and bus isolation. IC Role / Device Role / Timing Role: Registered bus bridge managing direction, timing, and isolation between mismatched bus protocols using DIR/OE/SAB/SBA controls. Use Value: Provides programmable data path selection (real-time vs. stored) and noise-immune signaling - extends life of aging instrumentation hardware. |
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 |
|---|---|---|---|
| 74ACT16245DL | No internal registers; only 3-state transceiver function - lacks CLKAB/CLKBA, SAB/SBA, and storage capability | Suitable for simple bidirectional bus buffering but cannot support stored-data multiplexing or real-time/stored arbitration | Select when only level translation and drive strength are needed - not a functional replacement for 74ACT16646DL |
| SN74LVTH16646DL | Lower-voltage (3.3 V) LVTH family; higher speed (tPD ≤ 4.2 ns), but only 3.6-V max VCC and no TTL-input compatibility | Designed for mixed-voltage 3.3-V systems with LVTTL interfaces - incompatible with 5-V TTL source signals without level shifting | Choose for new 3.3-V designs requiring faster timing; requires external level shifters if interfacing with 5-V TTL sources |
Compared with 74ACT16646DL, 74ACT16245DL omits all register and multiplexing logic - reducing functionality but lowering cost and power. SN74LVTH16646DL offers improved speed and lower voltage operation but sacrifices 5-V TTL compatibility and industrial temperature range, limiting retrofit use in legacy systems.
Availability
74ACT16646DL is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, test equipment data acquisition, and legacy system bus bridges requiring stable component supply and long-term obsolescence management.
Supply support for 74ACT16646DL 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 high-reliability industrial and automotive ICs.
The 74ACT16646DL belongs to TI's Widebus™ family of advanced bus-interface devices, engineered specifically for high-speed, noise-resilient data routing in industrial control, test instrumentation, and legacy-compatibility applications.
FAQ
What is the maximum operating frequency of the 74ACT16646DL?
The 74ACT16646DL supports a maximum clock frequency of 90 MHz under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to +85°C). This specification applies to both CLKAB and CLKBA inputs and is validated per TI's SCAS127B datasheet timing requirements. The 74ACT16646DL achieves this performance using TI's EPIC 1-μm CMOS process and distributed power/ground pin architecture to maintain signal integrity at high speeds.
Does the 74ACT16646DL support true bidirectional operation with independent control?
Yes, the 74ACT16646DL supports true bidirectional operation via separate DIR, OE, SAB, and SBA inputs for each 8-bit half (1x and 2x sections). Direction (DIR) selects bus flow (A→B or B→A), OE enables/disables outputs, and SAB/SBA independently select real-time or stored data paths per bus - enabling concurrent, asymmetric control of A and B data paths without conflict.
Can the 74ACT16646DL be used in systems with mixed 3.3-V and 5-V logic?
No - the 74ACT16646DL is a 5-V-only device with TTL-input compatibility and absolute maximum ratings up to 7 V on VCC. Its inputs are not 3.3-V tolerant, and applying 3.3-V logic signals directly may result in marginal or non-functional operation due to insufficient VIH/VIL margins. For mixed-voltage systems, level-shifting circuitry or a 3.3-V-compatible alternative like SN74LVTH16646DL is required.
How does the 74ACT16646DL handle simultaneous switching noise?
The 74ACT16646DL minimizes simultaneous switching noise through a distributed VCC/GND pin configuration: 12 VCC and 12 GND pins are interleaved across the 56-pin SSOP-DL package. This layout reduces power-supply inductance, lowers ground bounce, and maintains stable reference planes - a key design feature verified in TI's Widebus™ characterization for industrial backplane applications.
Is the 74ACT16646DL pin-compatible with other Widebus transceivers?
The 74ACT16646DL shares the same 56-pin SSOP-DL (DL) package footprint and pinout as other members of TI's 16-bit Widebus transceiver family, including 74ACT16245DL and 74ACT16373DL. However, signal assignments differ significantly - especially for clock (CLKAB/CLKBA), select (SAB/SBA), and register-control pins - so PCB reuse requires schematic-level verification and is not drop-in compatible without logic redesign.
74ACT16646DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 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
74ACT16646DL FAQ
1.How can I place an order for 74ACT16646DL through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16646DL 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 74ACT16646DL reliable?
The price and inventory of 74ACT16646DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16646DL is usually 5 days.
3.What payment methods are accepted for 74ACT16646DL?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT16646DL?
74ACT16646DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16646DL 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 74ACT16646DL?
For technical support, including 74ACT16646DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16646DL requirements.
6.How does Aetrix verify that 74ACT16646DL is sourced from the original manufacturer or authorized distributors?
All 74ACT16646DL 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 74ACT16646DL meets industry standards.
7.What is the process for return or replacement of 74ACT16646DL?
All 74ACT16646DL units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16646DL, 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 74ACT16646DL part is unused and in its original packaging.
Return procedure for 74ACT16646DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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