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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments 74ACT16543DL

Name: 74ACT16543DL
Brand: Texas Instruments
SKU: 74ACT16543DL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ACT16543DL

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 56-BSSOP (0.295", 7.50mm Width)

Datasheet:: 74ACT16543DL.pdf

Description:: IC TXRX NON-INVERT 5.5V 56SSOP

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Product details

Overview

74ACT16543DL from Texas Instruments is a 16-bit registered transceiver IC with dual 8-bit bidirectional data paths, 3-state outputs, TTL-compatible inputs, and flow-through pinout architecture optimized for high-density PCB layout. It operates from –40°C to 85°C at 4.5–5.5 V, supports ±24 mA output drive, and features independent A↔B latch enable (LEAB/LEBA) and output enable (OEAB/OEBA) controls for flexible bus isolation and data staging.

For engineers reviewing the 74ACT16543DL datasheet, 74ACT16543DL pinout, 74ACT16543DL application, or 74ACT16543DL equivalent, this device is selected for synchronous bidirectional data buffering in legacy industrial control backplanes, memory expansion interfaces, and FPGA-to-ASIC parallel bus bridging where latch-controlled timing and noise-immune 3-state bus driving are required.

Technical Context

The 74ACT16543DL implements two independent octal D-type latch registers - one for A-to-B and one for B-to-A data flow - each with dedicated CE, LE, and OE controls enabling transparent or storage mode operation per direction. Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process delivers 500-mA latch-up immunity at 125°C and low-noise switching via distributed V_CC/GND pins.

Timing is characterized with t_PLH/t_PHL ≤ 10.5 ns (A↔B), t_su = 2.5 ns, t_h = 4 ns, and t_w(LE) ≥ 7.5 ns at V_CC = 5 V and T_A = 25°C. The device uses true 3-state outputs (not inverted), supports TTL-level input thresholds (V_IL = 0.8 V, V_IH = 2 V), and maintains rail-to-rail output swing (V_OL ≤ 0.44 V, V_OH ≥ 3.8 V at I_OL/I_OH = ±24 mA).

Key Specifications

Parameter	Value and Actual Design Meaning
Function	16-bit bidirectional registered transceiver with independent A↔B latches and 3-state outputs
Supply Voltage	4.5–5.5 V - compatible with standard 5-V TTL/CMOS systems without level-shifting
Operating Temperature	–40°C to +85°C - qualified for commercial/industrial environments, not military-grade
Output Drive	±24 mA - sufficient to drive 50-Ω transmission lines or multiple TTL loads directly
Propagation Delay	≤10.5 ns (A↔B) - enables reliable operation up to ~50 MHz system clock rates with margin
Input Compatibility	TTL-voltage compatible (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) - interoperable with legacy 74LS/74F logic without interface buffers
Latch-Up Immunity	500 mA typical at 125°C - meets stringent reliability requirements for industrial power cycling

Pinout & Package

74ACT16543DL is housed in a 56-pin Shrink Small-Outline Package (SSOP-DL), 300-mil body width, 25-mil pin pitch, with gull-wing leads and exposed thermal pad (not electrically connected). Pin 1 is located at top-left corner (Q1 quadrant), and package dimensions are 11.35 mm × 18.67 mm × 2.79 mm (L × W × H).

Pin/Terminal	Circuit Role	Design Meaning
1OEAB, 2OEAB, 1OEBA, 2OEBA	Output Enable (active-low)	Disables respective 8-bit output port to high-impedance state; enables bidirectional bus sharing
1LEAB, 2LEAB, 1LEBA, 2LEBA	Latch Enable (active-low)	Controls transparent vs. stored mode for corresponding A↔B register; edge-triggered on low→high transition
1CEAB, 2CEAB, 1CEBA, 2CEBA	Chip Enable (active-low)	Gates data capture into latch; must be low for LE to take effect - prevents spurious latching
1A1–1A8, 2A1–2A8	Port A inputs/outputs	First and second 8-bit data bus segment on A side; bidirectional when paired with OE/LE controls
1B1–1B8, 2B1–2B8	Port B inputs/outputs	First and second 8-bit data bus segment on B side; functionally identical to A ports with mirrored control
V_CC (pins 7, 22, 39, 50)	Power supply	Distributed V_CC pins minimize simultaneous switching noise and improve PDN impedance
GND (pins 4, 11, 27, 33, 46, 53)	Ground reference	Six GND pins provide low-inductance return paths for high-speed switching currents

Key Features

Feature	Design Value
Flow-through architecture	Input and output pins arranged on opposite sides of package to eliminate layer jumps and reduce trace crossovers on dense PCBs
Distributed V_CC/GND pinning	Four V_CC and six GND pins placed across the package to suppress ground bounce and supply droop during 16-bit parallel switching
Independent directional control	Separate CE/LE/OE signals per 8-bit channel allow asymmetric data flow - e.g., A→B latched while B→A remains transparent
EPIC 1-µm CMOS process	Delivers ACT-series speed/power balance with 500-mA latch-up immunity - critical for field-reliable industrial deployments
TTL-input compatibility	Accepts standard 74LS/74F logic levels directly, eliminating need for external level translators in mixed-logic systems

Applications

Industrial Backplane Interface	FPGA-to-Memory Expansion Bridge
Use Scenario: Bidirectional data transfer between PLC CPU module and I/O expansion chassis over a 16-bit parallel bus with hot-swap capability. IC Role / Device Role / Timing Role: Registered transceiver providing controlled data staging, bus isolation during module insertion/removal, and noise-suppressed signal integrity. Use Value: Independent OE/LE per 8-bit lane allows selective bus arbitration and eliminates contention during partial reconfiguration.	Use Scenario: Extending a Xilinx Spartan FPGA's 16-bit data bus to connect off-chip SRAM or Flash memory with precise timing control. IC Role / Device Role / Timing Role: Synchronous latch-based buffer that aligns memory read/write strobes with FPGA clock domain and decouples timing skew. Use Value: t_su = 2.5 ns and t_h = 4 ns enable tight setup/hold margins for 50-MHz memory access cycles without additional delay elements.
Legacy System Bus Isolation	Test Equipment Data Capture Interface
Use Scenario: Isolating a microcontroller's address/data bus from a peripheral ASIC in a medical diagnostic instrument to prevent signal corruption during firmware updates. IC Role / Device Role / Timing Role: Directional bus gate with latch storage, allowing safe reprogramming of downstream logic while maintaining stable bus states. Use Value: 3-state outputs and CE/LE separation ensure zero bus glitches during mode transitions - critical for Class II medical device EMC compliance.	Use Scenario: Capturing parallel digital waveform data from a high-speed ADC array into a test controller's FIFO using a shared 16-bit data path. IC Role / Device Role / Timing Role: Registered capture interface synchronizing asynchronous ADC outputs to the controller's sampling clock via LEAB edge-triggering. Use Value: Flow-through pinout minimizes trace length mismatch across all 16 bits, preserving inter-channel skew < 100 ps for accurate multi-channel time alignment.

Industrial Backplane Interface

FPGA-to-Memory Expansion Bridge

Use Scenario: Bidirectional data transfer between PLC CPU module and I/O expansion chassis over a 16-bit parallel bus with hot-swap capability.

IC Role / Device Role / Timing Role: Registered transceiver providing controlled data staging, bus isolation during module insertion/removal, and noise-suppressed signal integrity.

Use Value: Independent OE/LE per 8-bit lane allows selective bus arbitration and eliminates contention during partial reconfiguration.

Use Scenario: Extending a Xilinx Spartan FPGA's 16-bit data bus to connect off-chip SRAM or Flash memory with precise timing control.

IC Role / Device Role / Timing Role: Synchronous latch-based buffer that aligns memory read/write strobes with FPGA clock domain and decouples timing skew.

Use Value: t_su = 2.5 ns and t_h = 4 ns enable tight setup/hold margins for 50-MHz memory access cycles without additional delay elements.

Legacy System Bus Isolation

Test Equipment Data Capture Interface

Use Scenario: Isolating a microcontroller's address/data bus from a peripheral ASIC in a medical diagnostic instrument to prevent signal corruption during firmware updates.

IC Role / Device Role / Timing Role: Directional bus gate with latch storage, allowing safe reprogramming of downstream logic while maintaining stable bus states.

Use Value: 3-state outputs and CE/LE separation ensure zero bus glitches during mode transitions - critical for Class II medical device EMC compliance.

Use Scenario: Capturing parallel digital waveform data from a high-speed ADC array into a test controller's FIFO using a shared 16-bit data path.

IC Role / Device Role / Timing Role: Registered capture interface synchronizing asynchronous ADC outputs to the controller's sampling clock via LEAB edge-triggering.

Use Value: Flow-through pinout minimizes trace length mismatch across all 16 bits, preserving inter-channel skew < 100 ps for accurate multi-channel time alignment.

Equivalent & Alternatives

The following parts are listed as comparable options for similar registered transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74ACT16541DL	Octal (8-bit), non-latched 3-state transceiver - no internal register storage; only bus direction control via OE.	Suitable for simple bus drivers without data staging; cannot replace 74ACT16543DL in latch-dependent timing-critical paths.	Select only if application requires basic direction control without hold/transparent mode sequencing.
SN74LVTH16543DGGR	Lower-voltage (3.3 V), higher-speed (t_PD ≤ 4.5 ns), LVTH series with TTL-compatible inputs but different V_CC range (2.7–3.6 V).	Requires level translation when interfacing with 5-V systems; unsuitable for direct drop-in replacement in existing 5-V designs.	Choose for new 3.3-V designs prioritizing speed and lower power; not recommended for 74ACT16543DL retrofit.

Compared with 74ACT16543DL, 74ACT16541DL lacks latch functionality and thus cannot support data staging or hold-mode operation, while SN74LVTH16543DGGR operates at 3.3 V and offers faster timing but introduces voltage translation complexity in legacy 5-V systems.

Availability

74ACT16543DL is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA memory expansion bridges, legacy system bus isolation, and test equipment data capture requiring stable component supply and long-term obsolescence management.

Supply support for 74ACT16543DL 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The 74ACT16543DL belongs to TI's Widebus™ family of high-speed CMOS logic devices, designed specifically for noise-immune, high-density parallel bus interfacing in industrial control and instrumentation systems.

FAQ

What is the operating temperature range for the 74ACT16543DL?

The 74ACT16543DL is characterized for operation from –40°C to +85°C. This commercial/industrial temperature grade distinguishes it from the military-spec 54ACT16543 (–55°C to +125°C) and confirms its suitability for factory automation, test equipment, and embedded control applications outside extreme environmental conditions.

Does the 74ACT16543DL support true bidirectional data flow with independent control?

Yes, the 74ACT16543DL supports fully independent A↔B data flow using separate CEAB/LEAB/OEAB and CEBA/LEBA/OEBA control sets. Each 8-bit register can be configured in transparent, latched, or high-impedance states without affecting the other direction - enabling asymmetric bus arbitration essential in complex backplane architectures.

What package type is used for the 74ACT16543DL, and is it RoHS-compliant?

The 74ACT16543DL uses the SSOP (DL) package: 56-pin, 300-mil body width, 25-mil pin pitch. Per TI's packaging documentation, the active variant 74ACT16543DLR.A is RoHS-compliant with NiPdAu (NIPDAU) lead finish and MSL Level-1 rating - confirming full compliance with EU Directive 2011/65/EU and JEDEC J-STD-020.

Can the 74ACT16543DL interface directly with TTL logic families?

Yes, the 74ACT16543DL features TTL-voltage compatible inputs (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), allowing direct connection to 74LS, 74F, and other legacy TTL outputs without level-shifting circuitry. Its 5-V supply and rail-swing outputs also ensure clean interfacing with TTL inputs.

What is the maximum output current specification for the 74ACT16543DL?

The 74ACT16543DL specifies ±24 mA output drive per pin under recommended operating conditions (V_CC = 4.5–5.5 V, T_A = –40°C to +85°C). This value is validated per TI's SCAS126B datasheet and supports driving multiple TTL loads or 50-Ω transmission lines without external buffers.

74ACT16543DL 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

74ACT16543DL FAQ

1.How can I place an order for 74ACT16543DL through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ACT16543DL 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 74ACT16543DL reliable?

The price and inventory of 74ACT16543DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16543DL is usually 5 days.

3.What payment methods are accepted for 74ACT16543DL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16543DL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74ACT16543DL?

74ACT16543DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ACT16543DL 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 74ACT16543DL?

For technical support, including 74ACT16543DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16543DL requirements.

6.How does Aetrix verify that 74ACT16543DL is sourced from the original manufacturer or authorized distributors?

All 74ACT16543DL 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 74ACT16543DL meets industry standards.

7.What is the process for return or replacement of 74ACT16543DL?

All 74ACT16543DL units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16543DL, 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 74ACT16543DL part is unused and in its original packaging.

Return procedure for 74ACT16543DL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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