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Texas Instruments 74ACT16544DL
- Part No.:
- 74ACT16544DL
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
74ACT16544DL.pdf
- Description:
- REGISTERED BUS TRANSCEIVER
- Quantity:
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Inventory:1,235
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Product details
Overview
74ACT16544DL from Texas Instruments is a 16-bit registered transceiver IC with dual-directional data flow control, TTL-voltage-compatible inputs, 3-state inverted outputs, and flow-through architecture optimized for PCB layout. It operates from −40°C to 85°C at 4.5–5.5 V supply, supports independent A↔B register control via dedicated latch-enable and output-enable pins, and is used in high-speed bus interface applications such as memory expansion and microprocessor data bus isolation.
For engineers reviewing the 74ACT16544DL datasheet, 74ACT16544DL pinout, 74ACT16544DL application, or 74ACT16544DL equivalent, key selection criteria include bidirectional latch timing (tPLH/tPHL ≤ 11.2 ns), ±24 mA drive strength, 500-mA latch-up immunity, distributed VCC/GND pin configuration for noise reduction, and compatibility with Widebus™-optimized system designs.
Technical Context
The 74ACT16544DL implements two independent 8-bit D-type latch sets-one for A-to-B and one for B-to-A data paths-each with separate CE, LE, and OE controls enabling asynchronous, directionally isolated register operation. Its EPIC™ 1-µm CMOS process delivers fast propagation (tPLH/tPHL = 2.8–11.2 ns) and low power dissipation (ICC ≤ 80 µA).
It features distributed VCC and GND pins across the 56-pin DL package to minimize simultaneous switching noise, and its flow-through pinout places inputs and outputs on opposite sides of the package to simplify trace routing. All inputs are TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V), and outputs drive ±24 mA with VOH ≥ 3.8 V and VOL ≤ 0.44 V at VCC = 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V logic systems and margin against rail droop. |
| Operating Temperature | −40°C to +85°C - qualified for commercial and industrial ambient environments without derating. |
| Propagation Delay | tPLH/tPHL ≤ 11.2 ns at VCC = 5 V - enables reliable operation in 80+ MHz bus systems with setup/hold margins. |
| Output Drive | ±24 mA per output - sufficient to drive 50-pF loads and multiple TTL inputs without external buffers. |
| Input Compatibility | TTL-level inputs (VIH = 2 V, VIL = 0.8 V) - allows direct interfacing with legacy 74LS and microcontroller GPIOs. |
| Latch-Up Immunity | 500 mA typical at 125°C - meets JEDEC JESD78 requirements for robustness in noisy or thermally stressed systems. |
| Power Dissipation | 1.4 W max at TA = 55°C - defines thermal design limits for continuous operation in compact enclosures. |
Pinout & Package
74ACT16544DL is housed in a 56-pin shrink small-outline (DL) package with 300-mil body width and 25-mil center-to-center pin pitch. The package supports twice the I/O density of standard SOIC while maintaining footprint compatibility with space-constrained board layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Controls 3-state output drivers for each 8-bit port; independent enables allow selective bus driving without contention. |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | Captures data on rising edge; transparent when low, latched when high - enables synchronous sampling of bidirectional buses. |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Enables data entry or output for corresponding port; must be low for any A↔B transfer to occur. |
| A1–A8, B1–B8 (x2 sets) | Bidirectional Data I/O | Two independent 8-bit ports support full-duplex or half-duplex data transfer between subsystems. |
| VCC, GND (x8 total) | Distributed Power/Ground | Multiple VCC/GND pairs reduce ground bounce and supply noise during high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Inputs on one side, outputs on opposite side - eliminates layer jumps and reduces trace length in dense PCB routing. |
| Dual independent 8-bit registers | Supports either two concurrent 8-bit transfers or one synchronized 16-bit transfer - increases system flexibility without added logic. |
| EPIC™ 1-µm CMOS process | Delivers AC performance comparable to bipolar logic with CMOS power efficiency and latch-up immunity. |
| TTL-voltage-compatible inputs | Accepts standard LS-TTL logic levels directly - eliminates level-shifter components in mixed-technology systems. |
| 3-state inverted outputs | Provides active-low bus drivers with high-impedance disable state - prevents bus contention in multi-master configurations. |
Applications
| Memory Expansion Interface | Microprocessor Bus Isolation |
|---|---|
|
Use Scenario: Expanding address/data bus between a microcontroller and external SRAM or Flash memory. IC Role / Device Role / Timing Role: Registered transceiver buffering and direction-controlled data staging between CPU and memory subsystems. Use Value: Enables clean timing separation between read/write cycles using independent LE/OE controls, reducing bus contention and setup violations. |
Use Scenario: Isolating a main processor bus from peripheral modules (e.g., UART, ADC, DAC) in an embedded controller. IC Role / Device Role / Timing Role: Bidirectional data gate with latch synchronization to prevent metastability during clock domain crossings. Use Value: Provides deterministic data capture via LEAB/LEBA edges, allowing peripherals to operate asynchronously relative to CPU clock. |
| Backplane Data Routing | Industrial PLC I/O Module |
|
Use Scenario: Routing parallel data between slot-based cards in a modular instrumentation backplane. IC Role / Device Role / Timing Role: High-speed registered repeater with noise-immune distributed power delivery. Use Value: Distributed VCC/GND pins and flow-through layout suppress simultaneous switching noise across 16-bit wide backplane traces. |
Use Scenario: Interfacing field I/O signals (24 V digital inputs/outputs) to a 5-V logic controller in programmable logic controllers. IC Role / Device Role / Timing Role: Level-translating and latching interface between ruggedized field-side circuitry and sensitive logic-side processors. Use Value: TTL-compatible inputs tolerate input noise up to 0.8 V, while 500-mA latch-up immunity protects against transient-induced failures in electrically harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT16245DL | Non-inverting 16-bit transceiver with identical pinout but no internal latches; requires external clocking for registered behavior. | Suitable for simpler unidirectional or non-latched bidirectional buffering where timing control is handled externally. | Select 74ACT16245DL only if latch functionality is implemented upstream; 74ACT16544DL provides integrated register control per port. |
| SN74LVTH16544DL | Lower-voltage (3.3 V) variant with LVCMOS inputs, reduced drive (±24 mA), and higher tPLH/tPHL (≤15 ns); pin-compatible but not voltage-compatible. | Used in mixed-voltage systems where 3.3-V logic domains interface with legacy 5-V buses via level translation. | Choose SN74LVTH16544DL for 3.3-V core systems requiring backward compatibility; 74ACT16544DL remains optimal for native 5-V designs. |
Compared with 74ACT16544DL, 74ACT16245DL lacks on-chip latches and requires external timing control, while SN74LVTH16544DL operates at 3.3 V and trades speed for voltage compatibility-making 74ACT16544DL the only solution offering native 5-V registered bidirectional transfer with flow-through layout and distributed power integrity.
Availability
74ACT16544DL is available at Aetrix Electronics and suitable for memory expansion interfaces, microprocessor bus isolation, backplane data routing, and industrial PLC I/O modules requiring stable component supply across long-life industrial programs.
Supply support for 74ACT16544DL 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 over 90 years of innovation in high-reliability electronic components.
The 74ACT16544DL belongs to TI's Widebus™ family of high-speed CMOS logic devices, designed specifically for noise-sensitive, high-density PCB applications requiring precise timing control and robust signal integrity in industrial and computing systems.
FAQ
What is the maximum operating frequency supported by the 74ACT16544DL?
The 74ACT16544DL does not specify a maximum clock frequency in its datasheet, but its propagation delay (tPLH/tPHL ≤ 11.2 ns at VCC = 5 V) and setup/hold times (tsu/th ≥ 1.5 ns) support reliable operation in systems with bus cycle times down to approximately 25 ns - equivalent to a theoretical maximum data rate of ~40 MHz for registered transfers. Actual achievable frequency depends on PCB layout, load capacitance, and timing margin requirements in the target application.
Does the 74ACT16544DL support hot-swap or live-insertion?
No, the 74ACT16544DL is not rated for hot-swap operation. Its absolute maximum ratings do not include powered insertion conditions, and it lacks bus-hold or power-up 3-state features required for safe live insertion. TI recommends powering the device before applying signal voltages, and using external protection circuits if hot-swap capability is required in the system design.
Can the 74ACT16544DL be used as two independent 8-bit transceivers?
Yes, the 74ACT16544DL is explicitly designed to operate as two independent 8-bit registered transceivers. Each set (1xx and 2xx) has dedicated CE, LE, and OE controls - allowing separate A↔B and B↔A data paths to be enabled, latched, and driven without interference. This is confirmed in the functional description, logic diagram, and pin labeling of the 74ACT16544DL datasheet.
What is the meaning of "flow-through architecture" in the 74ACT16544DL?
Flow-through architecture in the 74ACT16544DL refers to the physical pin arrangement where all A-side inputs/outputs are located on one half of the 56-pin DL package and all B-side inputs/outputs on the opposite half. This allows straight-line PCB trace routing between connected subsystems, minimizing vias, crossovers, and stub lengths - directly improving signal integrity and simplifying layout in high-speed parallel bus designs.
Is the 74ACT16544DL pin-compatible with the 54ACT16544WD military-grade version?
No, the 74ACT16544DL and 54ACT16544WD are not pin-compatible. While both share identical logic functionality and signal naming, the 74ACT16544DL uses a 56-pin shrink small-outline (DL) package with 25-mil pitch, whereas the 54ACT16544WD uses a 56-pin fine-pitch ceramic flat (WD) package with different mechanical dimensions and solder profile requirements. Pin numbering matches, but physical mounting and thermal design are incompatible.
74ACT16544DL 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:
- -
74ACT16544DL FAQ
1.How can I place an order for 74ACT16544DL through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16544DL 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 74ACT16544DL reliable?
The price and inventory of 74ACT16544DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16544DL is usually 5 days.
3.What payment methods are accepted for 74ACT16544DL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16544DL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT16544DL?
74ACT16544DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16544DL 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 74ACT16544DL?
For technical support, including 74ACT16544DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16544DL requirements.
6.How does Aetrix verify that 74ACT16544DL is sourced from the original manufacturer or authorized distributors?
All 74ACT16544DL 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 74ACT16544DL meets industry standards.
7.What is the process for return or replacement of 74ACT16544DL?
All 74ACT16544DL units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16544DL, 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 74ACT16544DL part is unused and in its original packaging.
Return procedure for 74ACT16544DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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