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Texas Instruments SN74LVC543APWR
- Part No.:
- SN74LVC543APWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC543APWR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,331
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Product details
Overview
SN74LVC543APWR from Texas Instruments is an octal registered transceiver with 3-state outputs, designed for bidirectional data flow between two 8-bit buses operating at 1.65 V to 3.6 V supply voltage. It features independent A-to-B and B-to-A latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls, 7 ns max propagation delay at 3.3 V, and 5.5 V-tolerant inputs-enabling use in mixed-voltage 3.3 V/5 V systems such as bus interface logic in industrial controllers.
For engineers reviewing the SN74LVC543APWR datasheet, SN74LVC543APWR pinout, SN74LVC543APWR application, or SN74LVC543APWR equivalent, key selection criteria include its dual-directional latching capability, Ioff partial-power-down support, 3-state output isolation, and TSSOP-24 package compatibility with high-density PCB layouts.
Technical Context
The SN74LVC543APWR implements two independent 8-bit D-type latch banks-one for A-to-B and one for B-to-A data paths-with separate CE, LE, and OE control signals per direction. Its Ioff circuitry disables outputs during power-down, preventing backflow current when VCC = 0 V.
It supports mixed-mode operation: inputs tolerate up to 5.5 V regardless of VCC (1.65–3.6 V), enabling level translation without external biasing. The device meets JESD 17 latch-up immunity (>250 mA) and operates across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables direct integration into modern low-voltage logic domains including 1.8 V, 2.5 V, and 3.3 V systems. |
| Input Voltage Tolerance | Up to 5.5 V - Allows interfacing with legacy 5 V logic without level shifters in mixed-voltage bus architectures. |
| Max Propagation Delay | 7 ns at VCC = 3.3 V - Supports high-speed data transfer in real-time control and memory-mapped peripheral interfaces. |
| Ioff Current | ±10 µA at VI/VO = 5.5 V - Ensures safe partial-power-down operation with no damaging back-current during system sleep states. |
| Output Drive Strength | ±24 mA at VCC = 3 V - Sufficient to drive standard CMOS loads and moderate capacitive bus traces without buffering. |
| Latch-Up Immunity | >250 mA per JESD 17 - Guarantees robustness against transient overvoltage events in industrial environments. |
| Operating Temperature | –40°C to +85°C - Qualified for extended industrial temperature range deployment in embedded automation and motor drives. |
Pinout & Package
TSSOP-24 package (PW), 0.65 mm pitch, 7.15 mm × 4.5 mm body size, 1.2 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LEBA | Latch-enable for B-to-A register - Low enables transparent mode; rising edge captures B-bus data into A-latches. |
| 2 | OEBA | Output-enable for B-to-A outputs - Low activates 3-state B-port drivers to drive A-bus. |
| 3–10 | A1–A8 | A-side data inputs/outputs - Bidirectional I/O pins connected to A-bus; driven by A-latches when OEAB = low. |
| 11 | CEAB | A-to-B chip-enable - Must be low to enable A-to-B data capture or B-output driving. |
| 12 | GND | Ground reference - Common return path for all internal logic and I/O circuits. |
| 13 | VCC | Power supply - Supplies core logic and output drivers; range 1.65–3.6 V. |
| 14 | CEBA | B-to-A chip-enable - Must be low to enable B-to-A data capture or A-output driving. |
| 15–22 | B1–B8 | B-side data inputs/outputs - Bidirectional I/O pins connected to B-bus; driven by B-latches when OEBA = low. |
| 23 | LEAB | Latch-enable for A-to-B register - Low enables transparent mode; rising edge captures A-bus data into B-latches. |
| 24 | OEAB | Output-enable for A-to-B outputs - Low activates 3-state A-port drivers to drive B-bus. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit latched paths | Enables concurrent A→B and B→A data transfers with separate timing control-critical for full-duplex bus arbitration. |
| 5.5 V-tolerant inputs on all ports | Eliminates need for external level translators when connecting 5 V microcontrollers to 3.3 V FPGAs or ASICs. |
| Ioff partial-power-down protection | Prevents current backflow from live buses into unpowered sections-essential for hot-swap and power-gated subsystems. |
| Low ground bounce (VOLP < 0.8 V) | Reduces noise coupling into adjacent signal lines and power rails during high-speed switching in dense PCB layouts. |
| High noise immunity (VIH/VIL thresholds scale with VCC) | Ensures reliable logic-level recognition across full VCC range (1.65–3.6 V), supporting dynamic voltage scaling designs. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module Bus Bridge |
|---|---|
|
Use Scenario: Isolating and synchronizing data between a 3.3 V ARM-based main controller and legacy 5 V I/O expansion modules on a modular PLC rack. IC Role / Device Role / Timing Role: Octal registered transceiver providing controlled, glitch-free bidirectional data handshaking with independent latch timing per direction. Use Value: Eliminates metastability risk via synchronous latching and ensures voltage compatibility without discrete level shifters or pull-up networks. |
Use Scenario: Interfacing a 3.3 V CAN microcontroller with 5 V analog sensor clusters and relay driver ICs in a vehicle body control unit. IC Role / Device Role / Timing Role: Voltage-translating bus transceiver with 3-state isolation during MCU reset or sleep modes. Use Value: Maintains bus integrity during power sequencing and prevents spurious activation of high-side drivers during brown-out conditions. |
| FPGA Configuration Data Pipeline | Test Equipment Digital Pattern Generator |
|
Use Scenario: Buffering and registering configuration bitstreams between a 2.5 V FPGA JTAG port and a 3.3 V boundary-scan controller ASIC. IC Role / Device Role / Timing Role: Registered transceiver acting as a synchronous pipeline stage to meet setup/hold timing margins on high-frequency configuration clocks. Use Value: Adds deterministic 1-cycle latency while absorbing jitter and skew-improving bitstream reliability at >25 MHz clock rates. |
Use Scenario: Driving multiple 5 V TTL-compatible test channels from a 3.3 V pattern generator FPGA in automated test equipment. IC Role / Device Role / Timing Role: Output buffer with 3-state control enabling channel multiplexing and simultaneous waveform updates across 8 parallel lines. Use Value: Delivers ±24 mA drive strength per pin to maintain fast edge rates into 50 Ω loads, preserving signal fidelity up to 100 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC541APWR | Octal buffer (unidirectional only); lacks B-to-A register path and CEBA/LEBA/OEBA controls. | Suitable only for A-to-B data flow; cannot replace bidirectional functionality without redesign. | Select only if application requires fixed-direction data transfer and space-constrained layout favors same TSSOP-24 footprint. |
| 74ALVC162245DGGR | 16-bit dual-supply transceiver (VCCA = 1.65–3.6 V, VCCB = 2.3–5.5 V); higher pin count (48-pin TSSOP), no internal latches. | Requires external clocking for registration; better for wide-bus, dual-voltage translation but adds timing complexity. | Choose when migrating to 16-bit buses or requiring true dual-supply rail-to-rail translation with programmable direction control. |
Compared with SN74LVC543APWR, SN74LVC541APWR reduces feature set to unidirectional operation-simplifying control logic but eliminating bidirectional latching. The 74ALVC162245DGGR offers wider data width and dual-supply flexibility at the cost of increased board area and external clock dependency for registered behavior.
Availability
SN74LVC543APWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, FPGA configuration pipelines, and automated test equipment requiring stable component supply and long-term manufacturability.
Supply support for SN74LVC543APWR 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 expertise in high-reliability interface IC design.
The SN74LVC543A product line delivers robust, low-voltage registered transceivers optimized for mixed-signal industrial, automotive, and computing systems requiring voltage translation, bus isolation, and deterministic data staging.
FAQ
What is the maximum clock frequency supported by SN74LVC543APWR?
The SN74LVC543APWR does not contain an internal clock; it is edge-triggered by control signals (LEAB/LEBA). Its 7 ns max propagation delay at 3.3 V supports effective data rates up to ~140 MHz in latch-controlled systems. Actual timing depends on external clocking of CE/LE signals and load capacitance.
Can SN74LVC543APWR operate with VCC = 1.8 V and interface with 5 V inputs?
Yes. SN74LVC543APWR is fully specified from 1.65 V to 3.6 V VCC and accepts input voltages up to 5.5 V on all pins-including A1–A8, B1–B8, CEAB, CEBA, LEAB, LEBA, OEAB, and OEBA-making it ideal for translating between 1.8 V logic and 5 V peripherals without external components.
Does SN74LVC543APWR support hot-swap or partial-power-down operation?
Yes. SN74LVC543APWR incorporates Ioff circuitry that disables outputs when VCC = 0 V, limiting off-state current to ±10 µA even with 5.5 V applied to I/O pins. This prevents damaging back-current during hot-insertion or subsystem power cycling.
What is the recommended pull-up resistor value for OE pins on SN74LVC543APWR during power-up?
TI recommends tying OEAB and OEBA to VCC through a pull-up resistor to ensure high-impedance outputs at power-up. Minimum resistance is determined by the driver's current-sinking capability; for typical 3.3 V systems, 10 kΩ provides sufficient noise margin and fast release while limiting current to <0.3 mA.
Is SN74LVC543APWR pin-compatible with other TSSOP-24 transceivers like SN74LVC245APWR?
No. SN74LVC543APWR has a unique pinout optimized for dual-latch control (CEAB/CEBA/LEAB/LEBA/OEAB/OEBA), differing significantly from the single-direction, single-OE architecture of SN74LVC245APWR. PCB layout and firmware control logic are not interchangeable.
SN74LVC543APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SN74LVC543APWR FAQ
1.How can I place an order for SN74LVC543APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC543APWR 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 SN74LVC543APWR reliable?
The price and inventory of SN74LVC543APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC543APWR is usually 5 days.
3.What payment methods are accepted for SN74LVC543APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC543APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC543APWR?
SN74LVC543APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC543APWR 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 SN74LVC543APWR?
For technical support, including SN74LVC543APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC543APWR requirements.
6.How does Aetrix verify that SN74LVC543APWR is sourced from the original manufacturer or authorized distributors?
All SN74LVC543APWR 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 SN74LVC543APWR meets industry standards.
7.What is the process for return or replacement of SN74LVC543APWR?
All SN74LVC543APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC543APWR, 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 SN74LVC543APWR part is unused and in its original packaging.
Return procedure for SN74LVC543APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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