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Texas Instruments SN74ABT16543DL
- Part No.:
- SN74ABT16543DL
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT16543DL.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,844
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Product details
Overview
SN74ABT16543DL from Texas Instruments is a 16-bit registered transceiver with dual 3-state outputs, designed for bidirectional data flow between two 16-bit buses. It features separate latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls per direction, ±32-mA high-drive outputs, and operates from 4.5 V to 5.5 V across –40°C to 85°C. It is used in high-speed bus interface applications requiring temporary data latching and noise-immune signal isolation.
For engineers reviewing the SN74ABT16543DL datasheet, SN74ABT16543DL pinout, SN74ABT16543DL application, or SN74ABT16543DL equivalent, this page delivers verified functional identity, DL-package pin mapping, timing parameters (e.g., tPLH ≤ 3.8 ns), drive strength (–32 mA IOH / 64 mA IOL), and validated alternatives for industrial bus buffering and register-controlled data routing.
Technical Context
The SN74ABT16543DL implements two independent 8-bit registered transceiver sections-each with transparent latch mode on LEAB/LEBA low and storage mode on low-to-high transition-enabling flexible A↔B data flow control via CEAB/CEBA, OEAB/OEBA, and LEAB/LEBA inputs. Its EPIC-IIB BiCMOS process delivers low ground bounce (VOLP < 1 V) and latch-up immunity (>500 mA per JESD-17).
Distributed VCC/GND pins and flow-through architecture minimize switching noise and optimize PCB layout. The device supports 50-pF load switching with propagation delays as low as 1 ns (tPLH/tPHL min) and enable/disable times under 7 ns (tPZL/tPHZ max), meeting requirements for synchronous bus interfacing in industrial controllers and memory expansion systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and CMOS logic domains. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded systems and automation equipment. |
| Output Drive Strength | –32 mA IOH / +64 mA IOL - Supports high-fanout bus loading without external buffers. |
| Propagation Delay (tPLH/tPHL) | 1 ns (min) to 3.8 ns (max) at VCC = 5 V, CL = 50 pF - Enables sub-266-MHz bus clocking with timing margin. |
| Enable/Disable Time (tPZL/tPHZ) | 1.1 ns (min) to 7.0 ns (max) - Allows rapid bus arbitration and dynamic direction switching. |
| Input Clamp Current | –18 mA - Protects against transient overvoltage on control inputs during hot-swap or ESD events. |
| Thermal Impedance (θJA) | 74°C/W (DL package) - Guides thermal design for continuous operation at full drive in enclosed enclosures. |
Pinout & Package
SN74ABT16543DL uses a 56-pin Shrink Small-Outline Package (SSOP-DL), 300-mil body width, 0.5-mm lead pitch, 13.9 mm × 7.9 mm footprint, and 1.2-mm max height. Pin 1 is marked by a beveled corner and located in Quadrant 1 per JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Controls 3-state output drivers for respective 8-bit sections; tie to VCC via pullup for power-up high-Z safety. |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | Configures latch transparency/storage mode; rising edge captures data into D-type registers. |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Gates data flow direction: CEAB low enables A→B path; CEBA low enables B→A path. |
| 1A1–1A8, 2A1–2A8 | Input/Output Port A (bidirectional) | First and second 8-bit data lanes from side A; driven by internal latches when enabled. |
| 1B1–1B8, 2B1–2B8 | Input/Output Port B (bidirectional) | First and second 8-bit data lanes to side B; reflect latched A-data or drive A when reversed. |
| VCC (pins 7, 22, 35, 46, 50) | Power Supply | Distributed VCC pins reduce simultaneous switching noise and improve PDN stability. |
| GND (pins 4, 11, 25, 32, 39, 43, 53) | Ground Reference | Seven dedicated GND pins provide low-inductance return paths for high-speed switching currents. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input and output pins arranged to support straight PCB trace routing-reducing crosstalk and layer count in dense bus layouts. |
| High-drive 3-state outputs | –32 mA IOH / +64 mA IOL capability eliminates need for external bus drivers in 5-V backplane and motherboard designs. |
| EPIC-IIB BiCMOS process | Combines bipolar speed and CMOS density to achieve <1 V ground bounce and >500 mA latch-up immunity per JEDEC JESD-17. |
| Dual independent 8-bit sections | Enables split-bus operation: one section for address/data separation, the other for control/status channel buffering. |
| Distributed power/ground | Five VCC and seven GND pins minimize voltage droop and ground shift during 16-bit parallel switching events. |
Applications
| Industrial PLC Backplane Interface | Memory Expansion Subsystem |
|---|---|
Use Scenario: Interfacing microcontroller local bus to isolated I/O module backplane with bidirectional data and address multiplexing. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, glitch-free data transfer between CPU and peripheral modules using latch-controlled handshaking. Use Value: Eliminates external glue logic by integrating dual 8-bit latches and 3-state drivers-reducing BOM count and board area while maintaining timing integrity at 25 MHz. |
Use Scenario: Expanding SRAM or Flash memory capacity in embedded controllers where address/data bus must be shared across multiple devices. IC Role / Device Role / Timing Role: Bidirectional bus buffer with independent direction control, enabling CPU read/write cycles to external memory banks without contention. Use Value: High-drive outputs (64 mA IOL) drive long traces and multiple loads; flow-through pinout simplifies routing in space-constrained memory daughterboards. |
| Test Equipment Digital I/O Module | Automated Test Fixture Controller |
Use Scenario: Programmable digital pattern generator capturing and relaying stimulus signals between FPGA-based sequencer and DUT interface connectors. IC Role / Device Role / Timing Role: Registered transceiver acting as programmable direction-switched data pipeline with precise setup/hold timing (tsu = 3.5 ns, th = 2 ns). Use Value: Low propagation delay (≤3.8 ns) and tight timing specs ensure deterministic signal capture at 200+ Mbps, critical for boundary-scan and JTAG test vectors. |
Use Scenario: Controlling relay matrices and sensor signal conditioning circuits in production-line test fixtures requiring robust level translation and noise immunity. IC Role / Device Role / Timing Role: Industrial-grade bus isolator with latch-enabled data staging, decoupling controller timing from actuator response latency. Use Value: –40°C to +85°C rating and >500 mA latch-up immunity ensure reliable operation in factory-floor environments with EMI and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT16543DGGR | TSSOP-56 package (DGG); 0.65-mm lead pitch; 2000-piece tape-and-reel packaging. | Better suited for automated SMT assembly and higher-volume production due to TSSOP's smaller footprint and reel compatibility. | Select DGGR for new designs targeting surface-mount scalability; DL remains optimal for legacy tube-fed prototyping or repair. |
| SN74LVT16543DL | Lower-voltage operation (2.7–3.6 V); LVT BiCMOS process; reduced drive (–24 mA IOH / +24 mA IOL); 3.3-V logic compatible. | Designed for mixed-voltage systems where 3.3-V core logic interfaces with 5-V peripherals-requires level-shifting if replacing SN74ABT16543DL directly. | Choose LVT version only when migrating to 3.3-V supply rails; not drop-in compatible due to voltage and drive mismatch. |
Compared with SN74ABT16543DGGR and SN74LVT16543DL, the SN74ABT16543DL offers superior 5-V drive strength and tube-based availability for low-volume validation, while maintaining identical logic function and timing behavior-making it ideal for industrial field-replaceable units and engineering prototypes.
Availability
SN74ABT16543DL is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory expansion subsystems, and automated test fixture controllers requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT16543DL 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 expertise in high-reliability interface ICs for industrial and automotive markets.
The SN74ABT16543DL belongs to TI's Widebus™ family of advanced bus-interface logic, engineered specifically for noise-immune, high-speed bidirectional data transfer in industrial control, instrumentation, and computing infrastructure.
FAQ
What is the maximum operating frequency supported by the SN74ABT16543DL?
The SN74ABT16543DL does not specify a maximum clock frequency in its datasheet, but its propagation delay (tPLH/tPHL ≤ 3.8 ns) and setup/hold times (tsu = 3.5 ns, th = 2 ns) support reliable operation up to approximately 266 MHz in well-designed 50-pF bus environments. Actual system frequency depends on trace length, loading, and controller timing margins-not an intrinsic clock input.
Does the SN74ABT16543DL require external pull-up resistors on its output-enable pins?
Yes-the SN74ABT16543DL OEAB/OEBA pins are active-low, and to ensure high-impedance state during power-up or power-down, each OE pin should be tied to VCC through a pullup resistor. The minimum resistance value depends on the driver's current-sinking capability; TI recommends verifying against actual board-level reset sequencing and driver strength.
Can the SN74ABT16543DL be used as two independent 8-bit transceivers?
Yes-the SN74ABT16543DL contains two fully independent 8-bit registered transceiver sections (1A/1B and 2A/2B), each with dedicated CE, LE, and OE controls. This allows simultaneous A↔B data flow in both sections with separate timing and direction management-ideal for address/data splitting or dual-channel I/O expansion.
What is the thermal performance of the SN74ABT16543DL in its DL package?
The SN74ABT16543DL in the SSOP-DL package has a junction-to-ambient thermal resistance (θJA) of 74°C/W. Under worst-case conditions (5.5 V, full 16-bit drive), power dissipation may reach ~350 mW; derating curves and PCB copper area must be considered to maintain junction temperature below 125°C in sustained operation.
Is the SN74ABT16543DL pin-compatible with the SN74ABT16543DGGR?
Yes-the SN74ABT16543DL and SN74ABT16543DGGR share identical pin functions and logic behavior, but differ in package: DL is 300-mil SSOP with 0.5-mm pitch and tube packaging, while DGGR is TSSOP with 0.65-mm pitch and tape-and-reel. Mechanical layout and soldering profiles differ; no PCB redesign is needed only if footprint adapters or rework are acceptable.
SN74ABT16543DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74ABT16543DL FAQ
1.How can I place an order for SN74ABT16543DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT16543DL 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 SN74ABT16543DL reliable?
The price and inventory of SN74ABT16543DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT16543DL is usually 5 days.
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SN74ABT16543DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT16543DL 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 SN74ABT16543DL?
For technical support, including SN74ABT16543DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT16543DL requirements.
6.How does Aetrix verify that SN74ABT16543DL is sourced from the original manufacturer or authorized distributors?
All SN74ABT16543DL 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 SN74ABT16543DL meets industry standards.
7.What is the process for return or replacement of SN74ABT16543DL?
All SN74ABT16543DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT16543DL, 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 SN74ABT16543DL part is unused and in its original packaging.
Return procedure for SN74ABT16543DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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