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Texas Instruments 74ACT16543DLR
- Part No.:
- 74ACT16543DLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16543DLR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,664
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Product details
Overview
74ACT16543DLR from Texas Instruments is a 16-bit registered transceiver IC with dual 8-bit bidirectional data paths, 3-state outputs, TTL-voltage-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 supply, supports ±24 mA output drive, and features independent A↔B latch enable (LEAB/LEBA) and output enable (OEAB/OEBA) controls per register.
For engineers reviewing the 74ACT16543DLR datasheet, 74ACT16543DLR pinout, 74ACT16543DLR application, or 74ACT16543DLR equivalent, this device is selected for high-speed bus interface, memory expansion, and bidirectional data buffering in industrial control backplanes and legacy computing systems where latch-controlled data staging and noise-immune 3-state isolation are required.
Technical Context
The 74ACT16543DLR implements two independent octal D-type latched transceivers - each with separate CE, LE, and OE controls - enabling simultaneous or staggered A-to-B and B-to-A data transfers. Its EPIC 1-μm CMOS process delivers 500-mA latch-up immunity at 125°C and supports 11.6 ns max tPHL/tPLH propagation delay across the full temperature range.
Distributed VCC/GND pin configuration minimizes high-speed switching noise, while flow-through architecture aligns input and output pins on opposite sides of the package to simplify trace routing. All control inputs accept TTL-level voltages (VIL ≤ 0.8 V, VIH ≥ 2 V), and outputs drive ±24 mA at VCC = 5 V with VOH ≥ 3.8 V and VOL ≤ 0.44 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 16-bit bidirectional registered transceiver with dual 8-bit latched paths |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of ±10% regulation variation |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems and control equipment |
| Output Drive | ±24 mA - sufficient to drive multiple TTL loads or terminate short stubs on parallel buses |
| Propagation Delay | Max 11.6 ns (tPHL/tPLH) - enables reliable operation up to ~50 MHz bus clock rates with margin |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - interfaces directly with legacy 74LS/74ALS without level shifters |
| Latch-Up Immunity | 500 mA typical at 125°C - meets stringent reliability requirements for industrial power cycling |
Pinout & Package
74ACT16543DLR is housed in a 56-pin Shrink Small-Outline Package (SSOP-DL), 380-mil body width, 25-mil center-to-center pin pitch, with exposed thermal pad not present. Pin numbering follows standard DL package top-view orientation with Pin 1 in Q1 quadrant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Individually disables A→B or B→A outputs to high-impedance state; critical for bus arbitration and contention avoidance |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | Controls transparent vs. storage mode for corresponding 8-bit register; low-to-high transition captures data |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Gates data flow directionally - must be low to allow A→B or B→A transfer; enables hierarchical bus partitioning |
| 1A1–1A8, 2A1–2A8 | Port A inputs/outputs | First and second 8-bit bidirectional data ports on A side; connected to local processor or controller bus |
| 1B1–1B8, 2B1–2B8 | Port B inputs/outputs | First and second 8-bit bidirectional data ports on B side; typically connected to memory, peripheral, or backplane bus |
| VCC (Pins 7, 20, 32, 46, 54) | Power supply | Five distributed VCC pins reduce simultaneous switching noise and improve power integrity across wide data bus |
| GND (Pins 4, 11, 25, 37, 49) | Ground reference | Five distributed GND pins provide low-inductance return paths, essential for clean signal integrity at >20 MHz |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input and output pins aligned on opposite package edges - eliminates layer jumps and reduces crosstalk in dense 16-bit bus layouts |
| Distributed VCC/GND pins | Five VCC and five GND pins interleaved across package - lowers ground bounce and improves EMI performance at high switching rates |
| Independent directional control | Separate CE/LE/OE per 8-bit register - allows asymmetric data flow (e.g., A→B active while B→A held in latch) for flexible bus protocol handling |
| TTL-input compatibility | Accepts standard 74LS/74ALS logic thresholds - eliminates need for external level translators in mixed-logic-system upgrades |
| EPIC 1-μm CMOS process | Enables 500-mA latch-up immunity and stable operation up to 125°C junction - suitable for thermally constrained industrial enclosures |
Applications
| Industrial Backplane Interface | Legacy Memory Expansion |
|---|---|
|
Use Scenario: Bidirectional data transfer between CPU module and I/O expansion cards in modular PLC chassis using parallel backplane bus. IC Role / Device Role / Timing Role: Registered transceiver buffers and isolates address/data/control signals; latches synchronize burst transfers across asynchronous modules. Use Value: Flow-through pinout and distributed power pins minimize skew and noise on 16-bit bus running at 25 MHz; 3-state outputs prevent contention during hot-swap events. |
Use Scenario: Adding external SRAM or EPROM to microcontroller-based instrumentation with limited address/data bus pins. IC Role / Device Role / Timing Role: Acts as bidirectional data buffer and latch between MCU data bus and memory device, supporting multiplexed or non-multiplexed addressing schemes. Use Value: Independent LE/OE controls allow precise timing of memory read/write cycles; TTL compatibility ensures direct interface with older 8051/68K families without level-shifting. |
| Processor Bus Isolation | Test Equipment Data Capture |
|
Use Scenario: Isolating development board CPU bus from external debug probe or logic analyzer during firmware bring-up. IC Role / Device Role / Timing Role: Provides controlled, latched visibility into bidirectional bus traffic; enables glitch-free sampling of address/data strobes. Use Value: 11.6 ns max propagation delay ensures accurate capture of 50-MHz bus transitions; 3-state outputs allow safe insertion without disrupting target system timing. |
Use Scenario: Capturing parallel digital waveform data from sensor array or ADC interface in automated test systems. IC Role / Device Role / Timing Role: Latches incoming parallel samples on trigger event, then presents stable data to host controller via controlled output enable. Use Value: Dual 8-bit registers support ping-pong acquisition; independent OE control permits seamless handoff between capture and readout phases without bus contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT16245DLR | Non-latched 16-bit transceiver; no LE/CE inputs - only OE-controlled 3-state buffering | Suitable for simple bus driving without data staging; lacks register functionality for pipeline or synchronization | Select when latch control is unnecessary and lower propagation delay (9.5 ns) is prioritized over data retention capability |
| SN74LVTH16543DGGR | Lower-voltage (3.3 V) LVTH family; TTL-compatible inputs but 3.3-V supply; 56-pin TSSOP (DGG) | Designed for mixed-voltage systems interfacing 3.3-V logic with 5-V peripherals; not drop-in compatible due to VCC and timing differences | Choose for new 3.3-V designs requiring similar register control but improved power efficiency and reduced EMI |
Compared with 74ACT16543DLR, the 74ACT16245DLR offers faster throughput but no data staging, while the SN74LVTH16543DGGR provides 3.3-V operation and better noise margin at the cost of non-interchangeable supply and thermal characteristics - neither is pin-compatible, requiring layout revision for substitution.
Availability
74ACT16543DLR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory expansion, processor bus isolation, and test equipment data capture requiring stable component supply across extended lifecycle programs.
Supply support for 74ACT16543DLR 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 74ACT16543DLR belongs to TI's Widebus™ family of high-speed CMOS logic devices, designed specifically for robust, noise-immune parallel bus interfacing in industrial control, instrumentation, and legacy system upgrades.
FAQ
What is the operating voltage range for the 74ACT16543DLR?
The 74ACT16543DLR operates over a supply voltage range of 4.5 V to 5.5 V. This 5-V nominal specification ensures compatibility with standard TTL and CMOS logic families, and accommodates typical power rail tolerances in industrial power supplies. Operation outside this range may cause functional failure or permanent damage, as specified in the absolute maximum ratings.
Does the 74ACT16543DLR support true bidirectional data flow with independent control?
Yes, the 74ACT16543DLR supports fully independent bidirectional data flow via two sets of dedicated control inputs: CEAB/LEAB/OEAB govern A-to-B transfer, while CEBA/LEBA/OEBA manage B-to-A transfer. Each 8-bit register can be enabled, latched, or tri-stated separately - enabling asymmetric protocols such as simultaneous A→B write and B→A read in memory-mapped I/O systems.
What package type and pin count does the 74ACT16543DLR use?
The 74ACT16543DLR uses a 56-pin Shrink Small-Outline Package (SSOP-DL) with 25-mil center-to-center pin pitch and 380-mil body width. This DL package provides twice the I/O density of standard SOIC while maintaining compatibility with automated SMT assembly processes and offering superior thermal and electrical performance versus older wide-body alternatives.
How does the flow-through architecture of the 74ACT16543DLR benefit PCB layout?
The flow-through architecture of the 74ACT16543DLR positions inputs and outputs on opposite sides of the package - e.g., Port A pins on one edge and Port B pins on the opposing edge - allowing straight-line trace routing without layer changes or vias. This reduces crosstalk, impedance discontinuities, and signal skew in high-speed 16-bit parallel buses, directly improving timing margin and EMI performance.
Is the 74ACT16543DLR pin-compatible with other members of the ACT16543 family?
Yes, the 74ACT16543DLR shares identical pinout and function with the 74ACT16543DGGR (TSSOP-DGG) and 54ACT16543WD (ceramic flat), as confirmed by TI's SCAS126B datasheet and package addendum. All variants use the same 56-pin assignment, including distributed VCC/GND and dual-register control structure - enabling footprint interchangeability where thermal and mechanical constraints permit.
74ACT16543DLR 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
74ACT16543DLR FAQ
1.How can I place an order for 74ACT16543DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16543DLR 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 74ACT16543DLR reliable?
The price and inventory of 74ACT16543DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16543DLR is usually 5 days.
3.What payment methods are accepted for 74ACT16543DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16543DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT16543DLR?
74ACT16543DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16543DLR 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 74ACT16543DLR?
For technical support, including 74ACT16543DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16543DLR requirements.
6.How does Aetrix verify that 74ACT16543DLR is sourced from the original manufacturer or authorized distributors?
All 74ACT16543DLR 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 74ACT16543DLR meets industry standards.
7.What is the process for return or replacement of 74ACT16543DLR?
All 74ACT16543DLR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16543DLR, 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 74ACT16543DLR part is unused and in its original packaging.
Return procedure for 74ACT16543DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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