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Texas Instruments SN74LVTH543PWR
- Part No.:
- SN74LVTH543PWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVTH543PWR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,126
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Product details
Overview
SN74LVTH543PWR 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. Used in backplane interface and legacy system bridging applications.
For engineers reviewing the SN74LVTH543PWR datasheet, SN74LVTH543PWR pinout, SN74LVTH543PWR application, or SN74LVTH543PWR equivalent, key selection criteria include bidirectional latch control (LEAB/LEBA), independent output enables (OEAB/OEBA), CEAB/CEBA flow gating, bus-hold elimination of external resistors, and TSSOP-24 packaging for space-constrained board designs.
Technical Context
The SN74LVTH543PWR integrates two independent sets of D-type latches-one for A-to-B and one for B-to-A data paths-with separate latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls. Each direction requires its dedicated chip-enable (CEAB or CEBA) to be low for data transfer.
Its bus-hold circuitry actively maintains valid logic states on undriven A/B port inputs without external pull resistors, and Ioff protection disables outputs during power-down to prevent current backflow-critical for live-insertion systems operating across 2.7–3.6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery supply and ensures stable operation across industrial voltage tolerances |
| IOL / IOH | 64 mA / −32 mA - drives standard TTL loads directly without buffer stages in 3.3-V systems |
| tPLH/tPHL | 1.2 ns to 4.3 ns (VCC = 3.3 V) - enables high-speed bidirectional data handshaking in synchronous bus architectures |
| Bus-Hold Current | ±500 µA at VCC = 3.6 V - eliminates need for external pullup/pulldown resistors on A/B data lines |
| Ioff | ±100 µA at VCC = 0 V - prevents damaging back-current during hot-swap or partial-power-down sequences |
| ESD Rating | 2000-V HBM, 200-V MM - meets JEDEC JESD22-A114/A115 for robust handling in manufacturing and field service |
| Thermal Resistance θJA | 88°C/W (TSSOP-PW) - defines maximum power dissipation limit under natural convection cooling |
Pinout & Package
TSSOP-24 package (PW), 7.8 mm × 4.4 mm footprint, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | Data inputs for A-to-B path; internally connected to A-latch D-inputs |
| 9, 10, 11, 12, 13, 14, 15, 16 | B1–B8 I/Os | 3-state bidirectional data terminals for B-side; driven by A-latches or drive A-latches |
| 17 | CEAB | A-to-B chip enable - must be low to enable A-latch transparency or B-output driving |
| 18 | GND | Ground reference for all internal circuitry and I/O structures |
| 19 | VCC | 3.3-V supply input; powers all logic, bus-hold, and output drivers |
| 20 | CEBA | B-to-A chip enable - must be low to enable B-latch transparency or A-output driving |
| 21, 22, 23, 24 | LEBA, OEBA, LEAB, OEAB | Latch-enable and output-enable controls for each direction - fully independent timing and state management |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal interface | Accepts 5-V TTL-level inputs while operating at 3.3-V VCC, enabling seamless bridging between legacy and low-voltage subsystems |
| Hot-insertion support | Ioff and power-up 3-state ensure outputs remain high-impedance during power ramp-up/down, preventing bus contention in live-backplane systems |
| Integrated bus-hold | Active input-hold circuitry maintains valid logic states on floating A/B data lines - removes need for 10-kΩ external resistors and saves PCB area |
| Dual independent data paths | Separate LE/OE/CE controls per direction allow asymmetric flow control - e.g., A-to-B latched while B-to-A is disabled or transparent |
| Latch transparency mode | When LEAB is low and CEAB is low, A inputs pass directly to B outputs - supports real-time monitoring or bypass functionality |
Applications
| Industrial Backplane Interface | Legacy System Bridging |
|---|---|
|
Use Scenario: Interfacing a 3.3-V FPGA-based controller to a 5-V ISA or VME bus in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver with latch isolation between clock domains. Use Value: Eliminates discrete level shifters and external bus-hold resistors, reducing BOM count and layout complexity while maintaining signal integrity at 25-MHz bus rates. |
Use Scenario: Upgrading aging test equipment with modern microcontrollers while retaining original 5-V peripheral modules. IC Role / Device Role / Timing Role: Voltage-tolerant octal transceiver providing controlled data handoff between mismatched logic families. Use Value: Enables direct connection without redesigning power distribution or adding voltage translators - accelerates retrofit timelines and avoids firmware revalidation. |
| Hot-Swappable Module Interface | Low-Power Embedded Data Hub |
|
Use Scenario: Carrier board supporting field-replaceable mezzanine cards in telecom line cards with live power insertion. IC Role / Device Role / Timing Role: Isolation and flow-control element ensuring bus stability during card insertion/removal events. Use Value: Ioff and power-up 3-state prevent glitch-induced resets or data corruption when modules are inserted into powered backplanes. |
Use Scenario: Battery-powered portable instrumentation requiring minimal quiescent current and robust noise immunity. IC Role / Device Role / Timing Role: Low-voltage bidirectional data concentrator managing sensor readouts and actuator commands. Use Value: Operates down to 2.7 V with <0.2 mA ICC (disabled state), extending runtime while bus-hold prevents spurious interrupts from floating sensor lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC543APWR | Lower drive strength (24 mA IOL), no bus-hold, no Ioff; LVTTL-compatible only (no 5-V tolerant inputs) | Suitable for pure 3.3-V systems without legacy interface or hot-swap requirements | Select when cost reduction is prioritized over mixed-voltage support and robustness features |
| 74ALVCH162245DGGR | 16-bit, dual-supply (VCCA/VCCB), higher speed (tPD = 2.8 ns), but no latch function or bus-hold | Used in high-bandwidth memory/data bus translation where latching is handled upstream | Choose for wider data paths and dual-rail translation, not for latch-controlled bidirectional flow |
Compared with SN74LVTH543PWR, SN74LVC543APWR lacks 5-V input tolerance and hot-swap protection-making it unsuitable for legacy integration-while 74ALVCH162245DGGR offers greater bandwidth and flexibility across voltage domains but omits the critical latch-enable and bus-hold functions required for deterministic control in buffered bus architectures.
Availability
SN74LVTH543PWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bridging, hot-swappable module interconnects, and low-power embedded data hubs requiring stable component supply and long-term manufacturability.
Supply support for SN74LVTH543PWR 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 industrial-grade reliability validation.
The SN74LVTH543PWR belongs to TI's LVTH logic family, designed specifically for mixed-voltage system interfacing where 3.3-V core logic must communicate reliably with 5-V legacy peripherals under hot-insertion and wide supply conditions.
FAQ
What is the primary function of the SN74LVTH543PWR in a mixed-voltage system?
The SN74LVTH543PWR serves as a bidirectional octal transceiver that enables reliable data exchange between 3.3-V logic domains and 5-V TTL systems. Its 5-V-tolerant inputs, bus-hold circuitry, and independent latch/output controls make it ideal for bridging legacy and modern subsystems without external level-shifting components or pull resistors.
Does the SN74LVTH543PWR support hot insertion, and how is this implemented?
Yes, the SN74LVTH543PWR supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V to prevent back-current, and power-up 3-state holds outputs in high-impedance until VCC stabilizes above 1.5 V. These mechanisms eliminate bus contention during live module replacement in backplane or carrier-board applications.
Can the SN74LVTH543PWR operate below 3.3 V, and what is its minimum functional supply voltage?
Yes, the SN74LVTH543PWR is fully specified down to 2.7 V VCC. At this voltage, it maintains guaranteed logic thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), 48-mA output drive, and functional bus-hold - making it suitable for battery-powered or unregulated supply environments where voltage droop occurs.
How does the bus-hold feature of the SN74LVTH543PWR simplify PCB design?
The bus-hold circuitry in the SN74LVTH543PWR actively maintains the last-valid logic state on all A and B port inputs when left floating, eliminating the need for external 10-kΩ pullup or pulldown resistors. This reduces component count, saves board space, avoids resistor-induced noise coupling, and improves signal integrity in high-density layouts.
What are the key timing control signals for bidirectional data flow in the SN74LVTH543PWR?
The SN74LVTH543PWR uses six dedicated control signals: CEAB and CEBA gate data flow direction; LEAB and LEBA determine latch transparency vs. storage mode; OEAB and OEBA independently enable/disable B and A outputs. This granular control allows asymmetric operation - for example, latching A→B data while keeping B→A outputs disabled - essential for protocol-aware buffering.
SN74LVTH543PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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-TSSOP
SN74LVTH543PWR FAQ
1.How can I place an order for SN74LVTH543PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH543PWR 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 SN74LVTH543PWR reliable?
The price and inventory of SN74LVTH543PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH543PWR is usually 5 days.
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SN74LVTH543PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH543PWR 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 SN74LVTH543PWR?
For technical support, including SN74LVTH543PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH543PWR requirements.
6.How does Aetrix verify that SN74LVTH543PWR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH543PWR 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 SN74LVTH543PWR meets industry standards.
7.What is the process for return or replacement of SN74LVTH543PWR?
All SN74LVTH543PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH543PWR, 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 SN74LVTH543PWR part is unused and in its original packaging.
Return procedure for SN74LVTH543PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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