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Texas Instruments SN74LVTH543DWR
- Part No.:
- SN74LVTH543DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVTH543DWR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,792
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Product details
Overview
SN74LVTH543DWR from Texas Instruments is an octal transceiver with dual-directional latched data flow, supporting mixed-mode 3.3-V VCC operation while interfacing to 5-V TTL systems. It features bus-hold on all data inputs, Ioff and power-up 3-state for hot insertion, and operates down to 2.7 V for unregulated battery applications. Used in backplane interface and legacy bus bridging.
For engineers reviewing the SN74LVTH543DWR datasheet, SN74LVTH543DWR pinout, SN74LVTH543DWR application, or SN74LVTH543DWR equivalent, key selection criteria include bidirectional latch-enable control (LEAB/LEBA), independent output-enable (OEAB/OEBA), CEAB/CEBA direction gating, bus-hold elimination of external resistors, and hot-insertion support via Ioff and power-up 3-state.
Technical Context
The SN74LVTH543DWR implements two independent sets of D-type transparent latches-one for A-to-B and one for B-to-A data paths-each with dedicated latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls. Directional data flow requires active-low CEAB for A→B or CEBA for B→A, enabling precise timing isolation between bus domains.
Its bus-hold circuitry actively maintains valid logic states on undriven A/B port inputs without external pullups, and Ioff protection disables outputs during power-down to prevent current backflow. The device enters high-impedance state when VCC is below 1.5 V, and power-up 3-state ensures conflict-free initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery supply and low-voltage system integration |
| IOL (max) | 64 mA at VCC = 3 V - drives standard TTL loads directly without buffering |
| tPLH/tPHL | 1.2–3.7 ns (VCC = 3.3 V, CL = 50 pF) - enables high-speed bidirectional data transfer in 33-MHz-class buses |
| Bus-Hold Current | ±500 µA at VCC = 3.6 V - maintains stable input logic without external biasing components |
| Ioff | ±100 µA at VCC = 0 V - blocks damaging back-current during hot-swap or partial power-down |
| Input Voltage Range | −0.5 V to 7 V - accepts 5-V TTL inputs safely while powered from 3.3-V rail |
| ESD Rating | 2000-V HBM, 200-V MM - meets industrial-level electrostatic robustness requirements |
Pinout & Package
SN74LVTH543DWR uses a 24-pin SOIC (DW) package, 7.5 mm × 15.4 mm body, 1.27 mm pitch, with gull-wing leads and RoHS-compliant NiPdAu finish. MSL Level-1, peak reflow 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Data Inputs/Outputs | Port A side of bidirectional data path; bus-hold enabled by default |
| 13, 14, 15, 16, 17, 18, 19, 20 | B1–B8 Data Inputs/Outputs | Port B side of bidirectional data path; compatible with 5-V TTL logic levels |
| 9 | CEAB | A-to-B direction enable - must be low to allow A→B latching or B-output driving |
| 10 | OEAB | A-to-B output enable - low enables B-port outputs; high places them in high-Z |
| 11 | LEAB | A-to-B latch enable - low makes A→B latches transparent; rising edge stores data |
| 22 | CEBA | B-to-A direction enable - must be low to allow B→A latching or A-output driving |
| 23 | OEBA | B-to-A output enable - low enables A-port outputs; high places them in high-Z |
| 24 | LEBA | B-to-A latch enable - low makes B→A latches transparent; rising edge stores data |
| 12 | GND | Ground reference for all internal circuitry and I/O |
| 21 | VCC | 3.3-V supply rail - powers internal logic and I/O buffers; supports 2.7–3.6 V operation |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Accepts 5-V TTL inputs and drives 5-V TTL loads while operating from 3.3-V VCC, eliminating level-shifter ICs |
| Bus-hold on all A/B data inputs | Eliminates need for external pullup/pulldown resistors, reducing BOM count and PCB space in unterminated bus designs |
| Ioff and power-up 3-state | Prevents current backflow during hot insertion and forces outputs to high-Z during power ramp, avoiding bus contention |
| Low ground bounce (VOLP) | <0.8 V at VCC = 3.3 V - minimizes noise coupling into shared ground planes in dense digital systems |
| Latch-up immunity | >500 mA per JESD 17 - ensures robust operation in noisy industrial environments with transient voltage exposure |
Applications
| Industrial Backplane Interface | Legacy System Bus Bridging |
|---|---|
|
Use Scenario: Interfacing a modern 3.3-V FPGA-based controller to an older 5-V ISA or VME bus segment. IC Role / Device Role / Timing Role: Bidirectional octal transceiver providing latch-controlled, direction-gated data transfer between voltage domains. Use Value: Enables direct connection without discrete level shifters or external bus terminators, leveraging built-in bus-hold and hot-swap safety. |
Use Scenario: Upgrading a 5-V microcontroller subsystem while retaining legacy peripheral modules with 5-V signaling. IC Role / Device Role / Timing Role: Voltage-tolerant transceiver managing controlled data handoff between new low-voltage logic and existing 5-V peripherals. Use Value: Maintains signal integrity across mixed-supply boundaries with sub-4-ns propagation delay and no external biasing required. |
| Hot-Swappable Module Interface | Embedded Control Subsystem Isolation |
|
Use Scenario: Adding/removing I/O expansion cards in a 3.3-V PLC base unit while main system remains powered. IC Role / Device Role / Timing Role: Hot-insertion–qualified transceiver isolating card-side signals using Ioff and power-up 3-state behavior. Use Value: Prevents bus glitches and back-current damage during live module replacement, certified per JESD 17 latch-up and ESD standards. |
Use Scenario: Segregating a real-time control processor (3.3-V) from sensor/actuator interfaces operating at 5-V logic levels. IC Role / Device Role / Timing Role: Latched bidirectional buffer ensuring deterministic data capture and output timing across supply domains. Use Value: Provides independent LE/OE control per direction, allowing precise synchronization of control command writes and status reads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVT543DWR | No bus-hold circuitry; requires external pullup/pulldown resistors on all A/B inputs | Suitable only where board layout guarantees defined input states; not recommended for floating-bus or hot-swap use | Select SN74LVT543DWR only if cost reduction outweighs design simplicity and reliability trade-offs in fixed-configuration systems |
| SN74LVTH16543DGGR | 16-bit version in 48-pin TSSOP; higher channel count but larger footprint and different pinout | Used in wider data paths (e.g., 16-bit memory or address buses); not drop-in replaceable due to pin count and package mismatch | Choose SN74LVTH16543DGGR when scaling bandwidth beyond 8 bits is required and PCB redesign is acceptable |
Compared with SN74LVT543DWR, SN74LVTH543DWR adds bus-hold and enhanced hot-swap robustness at identical pinout and speed; versus SN74LVTH16543DGGR, it offers 8-bit compatibility in compact SOIC with lower system-level routing complexity.
Availability
SN74LVTH543DWR is available at Aetrix Electronics and suitable for industrial backplane interface, legacy bus bridging, and hot-swappable module designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74LVTH543DWR 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 in industrial-grade interface ICs.
The SN74LVTH543DWR belongs to TI's LVTH logic family, designed specifically for robust mixed-voltage communication between 3.3-V systems and legacy 5-V TTL infrastructure in harsh or field-upgradeable environments.
FAQ
What is the maximum data rate supported by SN74LVTH543DWR?
The SN74LVTH543DWR supports reliable operation up to 33 MHz in typical bus configurations, based on its 1.2–3.7 ns propagation delay (tPLH/tPHL) under 50-pF load conditions at VCC = 3.3 V. Actual achievable rate depends on trace length, termination, and fanout; for sustained 33-MHz operation, maintain controlled-impedance routing and minimize capacitive loading beyond 50 pF.
Does SN74LVTH543DWR require external pullup resistors on its data lines?
No, SN74LVTH543DWR does not require external pullup or pulldown resistors on A1–A8 or B1–B8 inputs because it integrates active bus-hold circuitry on all data terminals. This feature maintains valid logic states on undriven or floating inputs, reducing component count and improving reliability in unterminated bus topologies.
Can SN74LVTH543DWR be used in hot-swap applications?
Yes, SN74LVTH543DWR is explicitly qualified for hot-insertion use via integrated Ioff circuitry and power-up 3-state functionality. When VCC is off or ramping, outputs remain in high-impedance state and Ioff blocks reverse current flow, preventing damage or bus contention during live module insertion or removal.
What is the function of CEAB and CEBA pins on SN74LVTH543DWR?
CEAB (Chip Enable A-to-B) and CEBA (Chip Enable B-to-A) are directional gate controls on SN74LVTH543DWR. CEAB must be low to enable A→B data latching or B-port output driving; CEBA must be low for B→A operation. Both are independent, allowing simultaneous or selective activation of either data path without interference.
Is SN74LVTH543DWR compatible with 5-V input signals while powered from 3.3 V?
Yes, SN74LVTH543DWR accepts 5-V TTL input signals safely while operating from a 3.3-V VCC supply, with guaranteed input voltage range up to 7 V and absolute maximum rating of −0.5 V to 7 V. Its input structure includes clamping diodes and current limiting, enabling direct interfacing to legacy 5-V logic without external level translation.
SN74LVTH543DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- 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:
- 24-SOIC
SN74LVTH543DWR FAQ
1.How can I place an order for SN74LVTH543DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH543DWR 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 SN74LVTH543DWR reliable?
The price and inventory of SN74LVTH543DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH543DWR is usually 5 days.
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SN74LVTH543DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH543DWR 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 SN74LVTH543DWR?
For technical support, including SN74LVTH543DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH543DWR requirements.
6.How does Aetrix verify that SN74LVTH543DWR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH543DWR 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 SN74LVTH543DWR meets industry standards.
7.What is the process for return or replacement of SN74LVTH543DWR?
All SN74LVTH543DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH543DWR, 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 SN74LVTH543DWR part is unused and in its original packaging.
Return procedure for SN74LVTH543DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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