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Texas Instruments SN74LVC16543DLR
- Part No.:
- SN74LVC16543DLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC16543DLR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,439
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Product details
Overview
SN74LVC16543DLR from Texas Instruments is a 16-bit registered transceiver IC designed for 3.3-V bus interface applications, featuring dual 8-bit bidirectional data paths, independent latch-enable and output-enable controls per direction, and 3-state outputs with bus-hold on all data inputs. It operates from –40°C to 85°C and supports high-speed data transfer with propagation delay as low as 1.5 ns at 3.3 V.
For engineers reviewing the SN74LVC16543DLR datasheet, SN74LVC16543DLR pinout, SN74LVC16543DLR application, or SN74LVC16543DLR equivalent, key selection considerations include its dual-directional register control logic, bus-hold input stabilization, 3.3-V-only supply compatibility, and DL-package thermal performance (1.4 W max at 55°C).
Technical Context
The SN74LVC16543DLR implements two independent 8-bit registered transceiver sections-A-to-B and B-to-A-each with dedicated CE, LE, and OE inputs enabling precise timing control of data latching and output enablement. Its EPIC™ submicron CMOS process ensures low ground bounce (VOLP < 0.8 V) and undershoot immunity (VOHV > 2 V) at 3.3 V.
Bus-hold circuitry eliminates external pullup/pulldown resistors on all A and B port inputs, while latch-up performance exceeds 250 mA per JEDEC JESD-17. The device requires no level-shifting and is not 5-V tolerant-inputs and outputs are strictly 3.3-V compatible with absolute max ratings up to VCC + 0.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - defines strict 3.3-V system compatibility; operation outside this range risks functional failure or damage. |
| Propagation Delay (tpd) | 1.5 ns (min) to 8 ns (max) at VCC = 3.3 V - enables high-speed synchronous bus interfacing up to ~125 MHz effective throughput. |
| IOL / IOH Drive | ±24 mA at VCC = 3 V - supports direct connection to multiple LVC/LVT inputs without buffering in point-to-point or lightly loaded buses. |
| Bus-Hold Current | ±75 µA at VI = 2 V or 0.8 V - actively holds floating data lines at valid logic levels, preventing metastability in unterminated stubs. |
| Operating Temperature | –40°C to 85°C - qualified for industrial-grade embedded systems including motor control and programmable logic interfaces. |
| Package Thermal Limit | 1.4 W max (DL package, TA = 55°C) - constrains continuous power budget in dense PCB layouts without forced airflow. |
Pinout & Package
SN74LVC16543DLR uses a 56-pin Plastic 300-mil Shrink Small-Outline (DL) package with 0.5-mm lead pitch and exposed pad thermal design. Pin numbering follows standard top-view orientation with dual-row symmetry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Individually disables 3-state outputs per 8-bit section; must be pulled high via resistor during power-up to ensure Hi-Z state. |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | Controls transparent vs. storage mode for corresponding A or B latches; edge-triggered behavior requires stable data before LE transition. |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Gates data flow directionally; CE must be low to allow latching or output driving-adds hierarchical bus arbitration capability. |
| A1–A8, B1–B8 (x2 sections) | Bidirectional Data I/O | True bidirectional ports with bus-hold; each pair (e.g., 1A1/1B1) forms one data channel; no internal direction control-direction set by CE/LE/OE logic. |
| VCC, GND (x5 each) | Power Distribution | Multiple distributed VCC/GND pins minimize simultaneous switching noise; critical for maintaining VOLP < 0.8 V under fast edge rates. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit register control | Enables asymmetric data flow management-e.g., A→B latched at 10 MHz while B→A runs at 2 MHz-without interlock timing constraints. |
| Integrated bus-hold on all data inputs | Eliminates need for 10-kΩ external pullups on 32 data lines, reducing BOM count, board area, and signal integrity risk from stub reflections. |
| Low ground bounce (VOLP < 0.8 V) | Mitigates false logic transitions during heavy simultaneous output switching-critical for reliable operation in mixed-signal environments. |
| JEDEC JESD-17 latch-up immunity >250 mA | Ensures robustness against transient overvoltage events on PCBs with shared ground planes or inductive loads. |
| EPIC™ submicron CMOS process | Delivers consistent 1.5-ns minimum propagation delay across temperature and voltage, supporting deterministic timing closure in FPGA-ASIC bridging. |
Applications
| Industrial PLC Backplane Interface | FPGA-to-Memory Bus Extension |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA I/O bank to legacy 16-bit parallel memory or peripheral ASIC with asynchronous control timing. IC Role / Device Role / Timing Role: Registered transceiver providing setup/hold time margin and direction-controlled data staging between clock domains. Use Value: Enables reliable handshaking across mismatched timing budgets using independent LE/CE sequencing-no external glue logic required. | Use Scenario: Extending a microcontroller's 16-bit external bus to off-chip SRAM or flash while maintaining full read/write bandwidth. IC Role / Device Role / Timing Role: Bidirectional bus repeater with latch synchronization, isolating controller timing from memory access latency variations. Use Value: Achieves 8 ns maximum tpd at 3.3 V, allowing sustained 125-MHz burst transfers without wait states in pipelined architectures. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
Use Scenario: Isolating MCU GPIOs from noisy CAN/LIN subsystem peripherals while preserving real-time response. IC Role / Device Role / Timing Role: Directionally gated data buffer with bus-hold protection against ESD-induced floating inputs during connector hot-plug events. Use Value: Prevents spurious resets or command corruption during vehicle power cycling-validated for –40°C to 85°C operation with no derating. | Use Scenario: Generating synchronized 16-bit stimulus patterns for DUT testing with precise edge alignment and output disable control. IC Role / Device Role / Timing Role: Programmable pattern latch with per-section OE/LE enabling multi-phase vector sequencing. Use Value: Supports sub-10 ns pulse-width resolution via independent CE/LE timing, eliminating need for FPGA-based pattern logic in mid-tier ATE. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH16543ADLR | Includes Schmitt-trigger inputs and higher drive (±32 mA); supports 1.65–3.6 V VCC range. | Required for noisy industrial environments or mixed-voltage systems where input hysteresis improves noise margin. | Select when interfacing to slow-rising signals or operating below 2.7 V-SN74LVC16543DLR lacks Schmitt inputs and has narrower VCC range. |
| 74ALVC16543PW | Same logic function but in TSSOP-56 (DGG) package; lower thermal rating (1 W vs. 1.4 W) and different pinout. | Suitable for space-constrained designs where DL package height or thermal mass is prohibitive. | Choose only if board layout accommodates DGG footprint and thermal design meets 1-W limit-pinout is not compatible with DL. |
Compared with SN74LVC16543DLR, SN74LVCH16543ADLR adds input hysteresis and wider voltage support at the cost of slightly higher ICC, while 74ALVC16543PW offers identical functionality in a thermally less capable but physically smaller package-neither is pin-compatible.
Availability
SN74LVC16543DLR is available at Aetrix Electronics and suitable for industrial automation backplanes, FPGA-to-memory interfaces, automotive body control modules, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC16543DLR 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 experience delivering high-reliability components for industrial, automotive, and communications infrastructure.
The SN74LVC16543DLR belongs to TI's Widebus™ family of advanced bus-interface ICs, engineered specifically for high-speed, low-voltage 3.3-V system interconnect with deterministic timing and robust noise immunity.
FAQ
What is the maximum operating frequency supported by the SN74LVC16543DLR?
The SN74LVC16543DLR does not specify a maximum clock frequency, but its propagation delay (tpd) is 1.5 ns (min) to 8 ns (max) at 3.3 V, enabling reliable operation in systems with data valid windows ≥8 ns. For synchronous bus use, it supports effective data rates up to ~125 MHz when paired with appropriate setup/hold margins and controlled slew rates.
Does the SN74LVC16543DLR support 5-V tolerant inputs?
No, the SN74LVC16543DLR is not 5-V tolerant. Its absolute maximum input voltage is VCC + 0.5 V, and recommended operating conditions restrict VI to 0–VCC. Applying 5 V to any input-even briefly-exceeds absolute maximum ratings and may cause permanent damage. Level-shifting circuitry is required for interfacing with 5-V systems.
How does bus-hold functionality work on the SN74LVC16543DLR?
The SN74LVC16543DLR integrates active bus-hold circuitry on all A and B port inputs, drawing ±75 µA at VI = 2 V or 0.8 V to weakly reinforce the last-valid logic state. This prevents floating inputs from drifting into undefined regions, eliminating external pullup/pulldown resistors while maintaining noise immunity-critical for unconnected or intermittently driven data lines.
Can the SN74LVC16543DLR be used as a single 16-bit transceiver or only as two 8-bit units?
The SN74LVC16543DLR can operate flexibly as either two independent 8-bit transceivers or one unified 16-bit unit. Its dual-section architecture-with separate CEAB/LEAB/OEAB and CEBA/LEBA/OEBA controls-allows fully independent timing and direction control per 8-bit group, or synchronized operation across all 16 bits using tied control signals.
What is the purpose of the multiple VCC and GND pins on the SN74LVC16543DLR DL package?
The SN74LVC16543DLR DL package includes five VCC and five GND pins distributed across the perimeter to minimize power delivery impedance and reduce simultaneous switching noise. This layout directly supports the device's low ground bounce specification (VOLP < 0.8 V), ensuring signal integrity during fast, wide-bus transitions without requiring complex PCB decoupling schemes.
SN74LVC16543DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- 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:
- -
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74LVC16543DLR FAQ
1.How can I place an order for SN74LVC16543DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC16543DLR 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 SN74LVC16543DLR reliable?
The price and inventory of SN74LVC16543DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC16543DLR is usually 5 days.
3.What payment methods are accepted for SN74LVC16543DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC16543DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC16543DLR?
SN74LVC16543DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC16543DLR 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 SN74LVC16543DLR?
For technical support, including SN74LVC16543DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC16543DLR requirements.
6.How does Aetrix verify that SN74LVC16543DLR is sourced from the original manufacturer or authorized distributors?
All SN74LVC16543DLR 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 SN74LVC16543DLR meets industry standards.
7.What is the process for return or replacement of SN74LVC16543DLR?
All SN74LVC16543DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC16543DLR, 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 SN74LVC16543DLR part is unused and in its original packaging.
Return procedure for SN74LVC16543DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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