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Texas Instruments SN74LVTH16543DGGR
- Part No.:
- SN74LVTH16543DGGR
- Manufacturer:
- Texas Instruments
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74LVTH16543DGGR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,933
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Product details
Overview
SN74LVTH16543 from Texas Instruments is a 3.3-V ABT 16-bit registered transceiver with 3-state outputs, designed for bidirectional data flow between 3.3-V logic and 5-V TTL systems. It supports mixed-mode operation (5-V inputs/outputs with 3.3-V VCC), features bus-hold on all data inputs, and delivers 64 mA low-level output drive at VCC = 3 V. It is used in backplane interface, memory expansion, and bus isolation applications requiring hot-insertion support.
For engineers reviewing the SN74LVTH16543 datasheet, SN74LVTH16543 pinout, SN74LVTH16543 application, or SN74LVTH16543 equivalent, key selection considerations include its dual 8-bit register control (LEAB/LEBA, OEAB/OEBA), Ioff-enabled hot-swap capability, 2.7–3.6 V supply range, and TSSOP-56 package with distributed power/ground pins for noise reduction.
Technical Context
The SN74LVTH16543 implements two independent 8-bit registered transceiver sections, each with separate latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls, enabling flexible direction management. Its Advanced BiCMOS Technology (ABT) ensures low static power dissipation while supporting 5-V-tolerant I/Os at 3.3-V VCC.
It integrates Ioff circuitry to disable outputs during power-down and power-up 3-state logic to prevent bus conflicts. Bus-hold circuitry eliminates external pullup/pulldown resistors on all A and B port inputs, and its flow-through pinout optimizes PCB layout for high-speed signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V without functional loss. |
| IOL / IOH | 64 mA / –32 mA at VCC = 3 V - sufficient drive strength for driving multiple TTL loads or long traces. |
| Input Voltage Tolerance | Up to 5.5 V on all A/B ports - enables direct interfacing with 5-V systems without level shifters. |
| Bus-Hold Current | ±75 µA at VI = 2 V or 0.8 V - actively holds floating inputs at valid logic levels, removing need for external biasing. |
| tPLH / tPHL | 1.1–3.7 ns (CL = 50 pF) - fast propagation enables use in high-throughput data paths up to ~200 MHz effective throughput. |
| Ioff | ±100 µA at VCC = 0 - prevents damaging backflow current during hot insertion or partial power-down. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment. |
Pinout & Package
TSSOP-56 (DGG) package with 1.2 mm max height, 0.5 mm pitch, and flow-through pin arrangement minimizing trace crossovers. Pin 1 located at top-left corner with quadrants Q1 orientation per tape reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Individually enable/disable 3-state outputs per 8-bit section; critical for bus arbitration and contention avoidance. |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | Control transparent vs. storage mode for A→B or B→A latches; allows synchronous capture of data edges. |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Gate data flow directionally - must be low to allow A→B or B→A transfer; adds layer of system-level control. |
| A1–A8, B1–B8 (x2 sections) | Bidirectional Data Ports | 16 total I/Os with bus-hold; support independent 8-bit or combined 16-bit transceiver operation. |
| VCC, GND (x8 each) | Distributed Power/Ground | Minimizes simultaneous switching noise (SSN) and improves signal integrity in high-speed parallel buses. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode 5-V tolerant I/O | Enables seamless interconnection between legacy 5-V TTL subsystems and modern 3.3-V logic without external level translators. |
| Hot-insertion support via Ioff & power-up 3-state | Prevents backdrive damage and bus contention during live board replacement in telecom or server backplanes. |
| Integrated bus-hold on all data inputs | Eliminates 32 external pullup/pulldown resistors in a 16-bit interface, reducing BOM count and PCB area. |
| Flow-through architecture | Allows straight-line PCB routing from A-side to B-side connectors, reducing skew and crosstalk in parallel bus layouts. |
| Distributed VCC/GND pinning | Reduces ground bounce (VOLP < 0.8 V) and improves noise margin in high-speed switching environments. |
Applications
| Backplane Interface | Memory Expansion Subsystem |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA-based controller to a legacy 5-V VMEbus or ISA-compatible backplane. IC Role / Device Role / Timing Role: Registered transceiver providing direction-controlled, latched data transfer with 5-V input tolerance and 3-state isolation. Use Value: Enables drop-in compatibility with existing 5-V backplane infrastructure while maintaining 3.3-V core logic power efficiency. | Use Scenario: Extending address/data bus between a microcontroller and external SRAM or Flash memory operating at different voltage domains. IC Role / Device Role / Timing Role: Bidirectional registered buffer isolating memory bus timing domains and preventing contention during read/write cycles. Use Value: Eliminates need for discrete level shifters and bus buffers, simplifying design and improving setup/hold margin via internal latching. |
| Hot-Swappable Module Interface | Industrial I/O Isolation |
Use Scenario: Connecting modular I/O cards to a central PLC backplane where modules may be inserted or removed under power. IC Role / Device Role / Timing Role: Hot-plug–qualified transceiver managing bidirectional data flow with Ioff and power-up 3-state protection. Use Value: Prevents system lockup or damage during live module replacement by blocking backfeed current and holding outputs high-Z during power transitions. | Use Scenario: Isolating noisy sensor or actuator signals from a clean microcontroller bus in factory automation equipment. IC Role / Device Role / Timing Role: Directionally controlled, registered buffer with bus-hold ensuring stable logic states on unterminated stubs. Use Value: Suppresses floating-input oscillation and EMI susceptibility without external bias components, improving EMC robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVT16543DGGR | LVT version lacks ABT's Ioff and enhanced hot-swap features; lower drive (32 mA IOL); no bus-hold. | Suitable only for non-hot-swap, low-noise, fully powered systems with external biasing. | Select when cost sensitivity outweighs hot-swap or bus-hold requirements. |
| SN74ALVCH16543GR | ALVC variant offers 1.65–3.6 V operation, higher speed (tPD ≈ 2.5 ns), but no 5-V tolerance or Ioff. | Requires level-shifting for 5-V interfaces; better for ultra-low-voltage, high-speed point-to-point links. | Choose for newer 1.8-V/2.5-V designs where 5-V compatibility is unnecessary. |
Compared with SN74LVT16543DGGR and SN74ALVCH16543GR, the SN74LVTH16543 provides unique 5-V-tolerant I/O, integrated bus-hold, and Ioff-enabled hot insertion - making it the only option among the three qualified for mixed-voltage backplane and live-replaceable module applications.
Availability
SN74LVTH16543 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, and hot-swappable module designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVTH16543 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 heritage in bus interface and widebus technologies.
The SN74LVTH16543 belongs to TI's Widebus™ family of advanced transceivers, engineered specifically for robust, mixed-voltage system interconnect in industrial, telecom, and computing infrastructure.
FAQ
What voltage levels can the SN74LVTH16543 tolerate on its A and B port inputs?
The SN74LVTH16543 supports input voltages up to 5.5 V on all A and B port pins, even when VCC is at 3.3 V. This 5-V tolerance enables direct connection to legacy TTL systems without external level-shifting circuitry. The device maintains full functionality across its 2.7–3.6 V VCC range while reliably accepting 5-V signals - a key feature confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the official datasheet.
Does the SN74LVTH16543 support hot insertion, and how is it implemented?
Yes, the SN74LVTH16543 supports hot insertion via two integrated mechanisms: Ioff circuitry disables outputs when VCC = 0, preventing damaging backflow current, and power-up 3-state logic forces outputs into high-impedance during power ramp-up/down. These features are explicitly documented in the device description and Functional Characteristics section. The SN74LVTH16543 is fully characterized for hot-insertion applications per JEDEC standards, making it suitable for live-backplane systems like telecom line cards or modular PLCs.
How many independent control sections does the SN74LVTH16543 provide, and what signals manage them?
The SN74LVTH16543 provides two independent 8-bit transceiver sections (Section 1 and Section 2), each with dedicated CE, LE, and OE inputs: 1CEAB/1LEAB/1OEAB and 2CEAB/2LEAB/2OEAB for A→B flow, plus corresponding 1CEBA/1LEBA/1OEBA and 2CEBA/2LEBA/2OEBA for B→A flow. This granular control allows asynchronous latching and output gating per byte lane - essential for partial-word transfers and multi-drop bus arbitration. The pinout diagram and Function Table in the datasheet confirm this dual-section architecture.
What is the purpose of bus-hold circuitry in the SN74LVTH16543, and how does it affect system design?
The bus-hold circuitry in the SN74LVTH16543 actively maintains valid logic states (VIH/VIL) on all A and B port inputs when they are unused or floating, drawing ±75 µA at switching thresholds. This eliminates the need for 32 external pullup/pulldown resistors in a full 16-bit configuration - reducing BOM cost, PCB real estate, and potential signal integrity issues from resistor parasitics. The feature is enabled by default and requires no configuration, as verified in the Electrical Characteristics table and device description.
What package type and thermal characteristics apply to the SN74LVTH16543DGGR variant?
The SN74LVTH16543DGGR uses a 56-pin TSSOP (DGG) package with 0.5 mm pitch and 1.2 mm maximum height. Its thermal impedance is θJA = 81°C/W, as specified in the Absolute Maximum Ratings table. The package supports standard reflow profiles (MSL Level-1, peak 260°C) and features a Q1 pin-1 quadrant orientation in tape-and-reel packaging. Mechanical dimensions, land pattern, and stencil recommendations are provided in TI's DGG0056A package outline document.
SN74LVTH16543DGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 56-TFSOP (0.240", 6.10mm 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
SN74LVTH16543DGGR FAQ
1.How can I place an order for SN74LVTH16543DGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH16543DGGR 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 SN74LVTH16543DGGR reliable?
The price and inventory of SN74LVTH16543DGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH16543DGGR is usually 5 days.
3.What payment methods are accepted for SN74LVTH16543DGGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH16543DGGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVTH16543DGGR?
SN74LVTH16543DGGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH16543DGGR 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 SN74LVTH16543DGGR?
For technical support, including SN74LVTH16543DGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH16543DGGR requirements.
6.How does Aetrix verify that SN74LVTH16543DGGR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH16543DGGR 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 SN74LVTH16543DGGR meets industry standards.
7.What is the process for return or replacement of SN74LVTH16543DGGR?
All SN74LVTH16543DGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH16543DGGR, 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 SN74LVTH16543DGGR part is unused and in its original packaging.
Return procedure for SN74LVTH16543DGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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