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Texas Instruments SN74LVTH16543DLR
- Part No.:
- SN74LVTH16543DLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVTH16543DLR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,727
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Product details
Overview
SN74LVTH16543DLR 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 systems. It supports mixed-mode operation (5-V inputs/outputs with 3.3-V VCC), features bus-hold on all data inputs, and delivers 128 mA low-level output drive at VCC = 3.3 V. Used in backplane interfaces and modular system interconnects requiring hot-insertion support.
For engineers reviewing the SN74LVTH16543DLR datasheet, SN74LVTH16543DLR pinout, SN74LVTH16543DLR application, or SN74LVTH16543DLR equivalent, key selection considerations include its dual 8-bit register control architecture, Ioff-enabled hot-swap capability, 2.7–3.6 V supply range, and SSOP-56 package compatibility with legacy Widebus™ layouts.
Technical Context
The SN74LVTH16543DLR implements two independent 8-bit registered transceiver sections (A↔B), each with dedicated latch-enable (LEAB/LEBA), output-enable (OEAB/OEBA), and chip-enable (CEAB/CEBA) controls. Its Advanced BiCMOS Technology (ABT) enables TTL-compatible 5-V signal interfacing while operating from a 3.3-V supply.
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 distributed VCC/GND pins reduce high-speed switching noise.
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 degradation |
| IOL (per output) | 64 mA at VCC = 3.3 V - drives heavy capacitive loads or multiple TTL inputs directly |
| VIH/VIL | 2.0 V / 0.8 V - compatible with standard TTL input thresholds for seamless 5-V system integration |
| tPLH/tPHL (max) | 3.7 ns at VCC = 3.3 V, CL = 50 pF - enables >200 MHz data throughput in point-to-point links |
| Bus-Hold Current | ±75 µA at VCC = 3 V - actively holds floating inputs at valid logic levels without external components |
| Ioff (max) | ±100 µA at VCC = 0 V - blocks damaging current backflow during hot insertion or partial power-down |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment |
Pinout & Package
SN74LVTH16543DLR is housed in a 56-pin Shrink Small-Outline Package (SSOP-DL), 13.9 mm × 7.4 mm × 2.4 mm body, with 0.5-mm lead pitch and gull-wing leads. Pin 1 identifier located at top-left corner of package marking area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Individually disables 3-state B or A outputs per 8-bit section; enables hot-swap isolation |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | Controls transparent vs. storage mode for A→B or B→A latches; enables synchronous data capture |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Gates data entry/output per section; must be low for any A↔B transfer to occur |
| A1–A8, B1–B8 (×2 sections) | Bidirectional Data Ports | 16 total I/Os with bus-hold; tolerate 5-V signals while powered from 3.3-V rail |
| VCC, GND (×8 each) | Distributed Power/Ground | Minimizes simultaneous switching noise via interleaved VCC/GND pin placement |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode 5-V/3.3-V interface | Accepts 5-V inputs and drives 5-V loads while powered from 3.3-V VCC - eliminates level-shifter ICs |
| Hot-insertion support | Ioff and power-up 3-state ensure zero current backflow and no bus contention during live board insertion |
| Integrated bus-hold | Active termination on all 32 data inputs - removes need for 32 external pullup/pulldown resistors |
| Flow-through pinout | Input and output pins arranged to minimize PCB trace crossovers - reduces layout complexity and EMI |
| Latch-enable independence | Separate LEAB/LEBA per 8-bit section allows asynchronous capture of A→B and B→A data streams |
Applications
| Backplane Interconnect | Modular System Expansion |
|---|---|
Use Scenario: High-density rack-mounted telecom modules exchanging configuration and status data across shared backplanes. IC Role / Device Role / Timing Role: Registered transceiver buffering and synchronizing parallel address/data/control buses between 3.3-V controller cards and 5-V legacy line cards. Use Value: Enables direct 5-V/3.3-V interoperability without discrete level shifters, reducing BOM count and signal integrity risk. | Use Scenario: Industrial PLC base units connecting hot-swappable I/O expansion modules via parallel bus. IC Role / Device Role / Timing Role: Bidirectional data register managing command/response handshaking between master CPU and slave module firmware. Use Value: Ioff and power-up 3-state prevent bus lockups during module insertion/removal, ensuring system uptime. |
| Legacy System Upgrade Interface | Test Equipment Signal Conditioning |
Use Scenario: Retrofitting modern 3.3-V FPGA-based controllers into aging 5-V instrumentation chassis. IC Role / Device Role / Timing Role: Voltage-tolerant transceiver translating control bus signals between new controller and legacy analog/digital subsystems. Use Value: Bus-hold eliminates floating inputs on unused slots, preventing spurious resets or misreads during partial configuration. | Use Scenario: Automated test equipment (ATE) fixture routing digital stimulus and response signals to DUTs with mixed voltage rails. IC Role / Device Role / Timing Role: Registered buffer isolating tester logic from DUT load variations and providing clean, synchronized sampling windows. Use Value: 3.7 ns max propagation delay ensures tight timing margins for high-speed digital pattern generation and capture. |
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 family: lower drive (32 mA), no bus-hold, no Ioff - requires external termination and hot-swap protection | Suitable only for static, fully powered systems with controlled insertion cycles | Select when cost sensitivity outweighs hot-swap or floating-input robustness requirements |
| SN74ALVCH16543GR | ALVCH family: 3.3-V only I/O (no 5-V tolerance), higher speed (2.8 ns typ), integrated ESD (4 kV HBM) | Requires full 3.3-V system environment; not interoperable with 5-V peripherals | Prefer for new 3.3-V-only designs prioritizing speed and ESD immunity over mixed-voltage flexibility |
Compared with SN74LVT16543DGGR and SN74ALVCH16543GR, the SN74LVTH16543DLR uniquely combines 5-V-tolerant I/O, bus-hold, and Ioff in a single SSOP-56 package - making it the only option for retrofitting 3.3-V logic into existing 5-V infrastructure with live-insertion capability.
Availability
SN74LVTH16543DLR is available at Aetrix Electronics and suitable for industrial backplane interconnects, modular system expansion boards, and legacy system upgrade interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SN74LVTH16543DLR 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 SN74LVTH16543DLR belongs to TI's Widebus™ family of advanced transceivers, engineered specifically for high-reliability, mixed-voltage system interconnects in industrial, telecom, and test equipment applications.
FAQ
What is the maximum output drive capability of the SN74LVTH16543DLR?
The SN74LVTH16543DLR provides up to 64 mA of low-level output current (IOL) per pin at VCC = 3.3 V, enabling direct drive of multiple TTL loads or moderate-capacitance PCB traces without external buffers. This specification is confirmed in the "recommended operating conditions" table of the official SCBS699D datasheet, and applies across the full industrial temperature range (–40°C to +85°C).
Does the SN74LVTH16543DLR support hot insertion?
Yes, the SN74LVTH16543DLR supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V, preventing back-current flow, and power-up 3-state forces outputs into high-impedance during power ramp-up. These functions are explicitly verified in the device's absolute maximum ratings and recommended operating conditions tables in the SCBS699D datasheet.
Can the SN74LVTH16543DLR interface directly with 5-V logic devices?
Yes, the SN74LVTH16543DLR accepts 5-V inputs and drives 5-V loads while operating from a 3.3-V supply - a core feature of its ABT process technology. Input voltage tolerance extends to 5.5 V, and output VOH reaches 2.4 V minimum under 24-mA load, meeting TTL high-level requirements. This mixed-mode capability is documented in the "recommended operating conditions" and "electrical characteristics" sections of SCBS699D.
What package type is used for the SN74LVTH16543DLR?
The SN74LVTH16543DLR uses a 56-pin Shrink Small-Outline Package (SSOP) with designation DL, measuring 13.9 mm × 7.4 mm × 2.4 mm with 0.5-mm lead pitch. This matches the mechanical drawing DGG0056A referenced in TI's packaging addendum and is distinct from the TSSOP (DGG) variant used in other members of the same family.
How does bus-hold functionality work on the SN74LVTH16543DLR?
The SN74LVTH16543DLR integrates active bus-hold circuitry on all 32 data inputs (A1–A8, B1–B8 ×2), maintaining floating pins at valid logic levels using ±75 µA hold current at VCC = 3 V. This eliminates the need for external pullup/pulldown resistors and is specified in the "electrical characteristics" table of SCBS699D under parameter II(hold).
SN74LVTH16543DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- 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:
- 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-SSOP
SN74LVTH16543DLR FAQ
1.How can I place an order for SN74LVTH16543DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH16543DLR 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 SN74LVTH16543DLR reliable?
The price and inventory of SN74LVTH16543DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH16543DLR is usually 5 days.
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Once your SN74LVTH16543DLR 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 SN74LVTH16543DLR?
For technical support, including SN74LVTH16543DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH16543DLR requirements.
6.How does Aetrix verify that SN74LVTH16543DLR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH16543DLR 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 SN74LVTH16543DLR meets industry standards.
7.What is the process for return or replacement of SN74LVTH16543DLR?
All SN74LVTH16543DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH16543DLR, 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 SN74LVTH16543DLR part is unused and in its original packaging.
Return procedure for SN74LVTH16543DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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