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Texas Instruments SN74LVT543DW
- Part No.:
- SN74LVT543DW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVT543DW.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:380
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Product details
Overview
SN74LVT543DW from Texas Instruments is a 3.3-V ABT octal registered transceiver with 3-state outputs, designed for bidirectional data flow between 3.3-V and 5-V systems. It features two independent D-type latch sets (A-to-B and B-to-A), separate latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls, bus-hold inputs eliminating external pullups, and operation down to 2.7 V for unregulated battery use.
For engineers reviewing the SN74LVT543DW datasheet, SN74LVT543DW pinout, SN74LVT543DW application, or SN74LVT543DW equivalent, key selection considerations include its dual-direction latching capability, 3.3-V VCC with 5-V tolerant I/O, 24-pin SOIC (DW) package, -40°C to 85°C temperature range, and compatibility with mixed-voltage backplane or bus interface designs.
Technical Context
The SN74LVT543DW implements Advanced BiCMOS Technology (ABT) to achieve low static power dissipation while supporting TTL-level interfacing in 3.3-V systems. Its dual-register architecture enables independent A↔B data staging via dedicated CEAB/CEBA, LEAB/LEBA, and OEAB/OEBA control lines - allowing simultaneous or asynchronous bidirectional buffering.
Bus-hold circuitry actively maintains valid logic states on unused A/B data inputs without external components, and output ground bounce (VOLP) remains below 0.8 V at VCC = 3.3 V and TA = 25°C. The device supports live insertion and tolerates input voltages up to 7 V, enabling robust operation in noisy or hot-swap environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery supply and brownout resilience |
| IOL / IOH | 64 mA / –32 mA - drives standard TTL loads directly without buffers |
| VIH / VIL | 2.0 V / 0.8 V - compatible with 5-V TTL input thresholds at 3.3-V VCC |
| tPLH / tPHL | 2.9 ns to 4.7 ns (typ, VCC = 3.3 V) - enables high-speed bus transfer up to ~170 MHz effective rate |
| Bus-Hold Current | ±75 µA (VI = 0.8 V or 2.0 V) - eliminates need for external pullup/pulldown resistors on idle data lines |
| ESD Protection | >2000 V HBM, >200 V MM - enhances reliability in handling and system integration |
| ICC (Active) | 8.8 mA (max, VCC = 3.6 V) - low quiescent current suitable for portable and power-sensitive applications |
Pinout & Package
SN74LVT543DW is housed in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), with 300-mil body width, gull-wing leads, and RoHS-compliant NiPdAu lead finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LEBA) | B-to-A latch enable | Low-active edge-triggered control: latches B-port data into B→A register on rising edge |
| 2 (OEBA) | B-to-A output enable | Low-active 3-state control for B→A output drivers; high = high-impedance |
| 3–10 (A1–A8) | A-port data inputs/outputs | Bidirectional I/O with bus-hold; connected to A-side system bus or controller |
| 11 (CEAB) | A-to-B chip enable | Low-active master control: must be low to enable A→B data capture or B-output drive |
| 12 (GND) | Ground reference | Primary return path for all digital and I/O currents; requires low-inductance PCB connection |
| 13 (VCC) | Supply voltage | 3.3-V nominal supply (2.7–3.6 V range); decoupling capacitor required near pin |
| 14 (CEBA) | B-to-A chip enable | Low-active master control for B→A path; independent of CEAB for asymmetric flow control |
| 15–22 (B1–B8) | B-port data inputs/outputs | Bidirectional I/O with bus-hold; interfaces to 5-V or 3.3-V peripheral bus or memory subsystem |
| 23 (LEAB) | A-to-B latch enable | Low-active edge-triggered control: captures A-port data into A→B register on rising edge |
| 24 (OEAB) | A-to-B output enable | Low-active 3-state control for A→B output drivers; high = high-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent register paths | Enables concurrent A→B and B→A data staging without contention, critical for full-duplex bus arbitration |
| Mixed-mode I/O tolerance | Accepts 5-V inputs and drives 5-V loads while operating at 3.3-V VCC - eliminates level-shifter ICs in 3.3/5-V interconnects |
| Integrated bus-hold circuitry | Maintains stable logic state on floating A/B inputs - removes 16 external pullup resistors and associated board area |
| Live-insertion support | Withstands hot-plug events without latch-up or damage due to controlled I/O clamp structure and ESD robustness |
| Low ground bounce (VOLP) | <0.8 V at VCC = 3.3 V - minimizes noise coupling into adjacent signals during high-speed switching |
Applications
| PCI Bus Interface | Memory Subsystem Bridge |
|---|---|
Use Scenario: Interfacing a 3.3-V microcontroller to a legacy 5-V PCI slot for add-in card communication. IC Role / Device Role / Timing Role: Registered transceiver providing direction-controlled, latched data transfer between CPU and PCI address/data bus. Use Value: Eliminates discrete level shifters and reduces signal integrity risk via controlled 3-state timing and low VOLP. | Use Scenario: Connecting a 3.3-V FPGA to 5-V SRAM or Flash memory in an industrial controller. IC Role / Device Role / Timing Role: Bidirectional registered buffer managing address/data handshaking with independent A→B and B→A latch timing. Use Value: Enables reliable read-modify-write cycles using bus-hold to retain data during OE transitions. |
| Hot-Swappable Backplane Module | Low-Power Embedded Data Logger |
Use Scenario: Adding/removing 3.3-V sensor modules into a 5-V powered telecom backplane without system reset. IC Role / Device Role / Timing Role: Isolation and voltage translation layer with live-insertion support and bus-hold for safe plug/unplug. Use Value: Prevents bus contention during insertion via high-impedance default state and withstands 200-V machine-model ESD. | Use Scenario: Battery-powered environmental monitor collecting analog sensor data via 3.3-V ADC and storing to 5-V EEPROM. IC Role / Device Role / Timing Role: Low-quiescent-current (0.13 mA disabled) transceiver enabling intermittent 3.3-V ↔ 5-V data transfers. Use Value: Operates down to 2.7 V VCC and draws only 8.8 mA active current - extends battery life in duty-cycled logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVTH16245ADGGR | 16-bit, non-latched, 3.3-V-only I/O, no bus-hold, higher drive (64 mA), TSSOP-48 | Requires external latches for registered behavior; suited for wide-bus, non-staging transfers | Select when wider data path and lower propagation delay (2.5 ns) outweigh need for on-chip latching and mixed-voltage tolerance |
| 74ALVC164245DGGR | 16-bit, non-latched, 3.3-V core with 5-V tolerant I/O, no bus-hold, TSSOP-48 | Lacks latch registers and bus-hold; needs external pullups; optimized for cost-sensitive, high-volume 3.3/5-V bridges | Choose for simpler, lower-cost bidirectional translation where staging and floating-input immunity are not required |
Compared with SN74LVT543DW, both alternatives offer higher bit-width but omit integrated latches and bus-hold - requiring additional components for equivalent functionality in staging or floating-bus scenarios, and lacking the same degree of live-insertion robustness.
Availability
SN74LVT543DW is available at Aetrix Electronics and suitable for PCI interface design, memory subsystem bridging, hot-swappable backplane modules, and low-power embedded data loggers requiring stable component supply across extended production lifecycles.
Supply support for SN74LVT543DW 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade performance.
The SN74LVT543DW belongs to TI's ABT (Advanced BiCMOS Technology) logic family, engineered for high-speed, low-power 3.3-V system interfacing with backward compatibility to 5-V TTL environments.
FAQ
What is the maximum operating temperature range for the SN74LVT543DW?
The SN74LVT543DW is characterized for operation from –40°C to +85°C ambient temperature. This commercial-grade rating aligns with TI's standard industrial temperature specification and ensures stable performance in embedded controllers, communications equipment, and industrial automation hardware where thermal margins exceed consumer-grade limits. The SN74LVT543DW maintains full electrical compliance across this range per its recommended operating conditions table.
Does the SN74LVT543DW require external pullup resistors on its data inputs?
No, the SN74LVT543DW does not require external pullup resistors on A1–A8 or B1–B8 inputs because it integrates active bus-hold circuitry. Each data input maintains a valid logic level (VIH or VIL) when left floating, drawing ±75 µA hold current at VCC = 3 V. This feature eliminates 16 external resistors, reduces BOM count, and improves layout density - confirmed in the device description and electrical characteristics section of the SCBS137D datasheet.
Can the SN74LVT543DW interface directly between a 3.3-V microcontroller and a 5-V peripheral?
Yes, the SN74LVT543DW supports direct 3.3-V to 5-V interfacing: its inputs tolerate up to 7 V, and outputs drive 5-V TTL loads with VOH ≥ 2.4 V at IOL = 24 mA (VCC = 2.7 V). When VCC = 3.3 V, it delivers VOH ≥ 2.0 V at –32 mA and VOL ≤ 0.55 V at 64 mA - meeting 5-V TTL VIH/VIL thresholds. This mixed-mode capability is explicitly stated in the device description and recommended operating conditions.
What is the function of the CEAB and CEBA pins on the SN74LVT543DW?
The CEAB (pin 11) and CEBA (pin 14) pins are low-active chip-enable controls for the A→B and B→A data paths, respectively. CEAB must be low to allow A-port data capture into the A→B latches or to enable B-port outputs; CEBA performs the same function for the reverse direction. Both operate independently, enabling asymmetric data flow control - for example, permitting A→B transmission while holding B→A in high-impedance. This behavior is defined in the FUNCTION TABLE and logic diagram of the SN74LVT543DW datasheet.
Is the SN74LVT543DW pin-compatible with other packages in the LVT543 family?
Yes, the SN74LVT543DW (SOIC-24) shares identical pinout and functionality with the SN74LVT543DB (SSOP-24) and SN74LVT543PW (TSSOP-24), as confirmed by the "SN74LVT543 . . . DB, DW, OR PW PACKAGE" designation and matching top-view pin diagrams in the SCBS137D datasheet. All three packages use the same 24-pin assignment, including LEBA, OEBA, A1–A8, CEAB, GND, VCC, CEBA, B1–B8, LEAB, and OEAB - enabling drop-in replacement across form factors.
SN74LVT543DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
SN74LVT543DW FAQ
1.How can I place an order for SN74LVT543DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT543DW 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 SN74LVT543DW reliable?
The price and inventory of SN74LVT543DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT543DW is usually 5 days.
3.What payment methods are accepted for SN74LVT543DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVT543DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVT543DW?
SN74LVT543DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT543DW 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 SN74LVT543DW?
For technical support, including SN74LVT543DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT543DW requirements.
6.How does Aetrix verify that SN74LVT543DW is sourced from the original manufacturer or authorized distributors?
All SN74LVT543DW 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 SN74LVT543DW meets industry standards.
7.What is the process for return or replacement of SN74LVT543DW?
All SN74LVT543DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT543DW, 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 SN74LVT543DW part is unused and in its original packaging.
Return procedure for SN74LVT543DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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