My Inquiry
My Account
Texas Instruments SN74LVTH543NS
- Part No.:
- SN74LVTH543NS
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74LVTH543NS.pdf
- Description:
- IC REGISTERED TRANSCVR 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,754
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVTH543NS from Fairchild Semiconductor is a low-voltage octal registered transceiver with 3-STATE outputs, designed for bidirectional data flow between 3.3V and 5V systems. It features dual D-type latch registers (A→B and B→A), independent Latch Enable (LEAB/LEBA) and Output Enable (OEAB/OEBA) controls, bushold inputs eliminating external pull-ups, and ±32 mA/64 mA drive capability. It operates across −40°C to +85°C with VCC = 2.7–3.6 V.
For engineers reviewing the SN74LVTH543NS datasheet, SN74LVTH543NS pinout, SN74LVTH543NS application, or SN74LVTH543NS equivalent, key selection criteria include its dual-direction latching control, TTL-compatible 5V interface tolerance, bushold input functionality, 3-STATE bus isolation, and SOIC-24 package compatibility in industrial bus interface designs.
Technical Context
The SN74LVTH543NS implements two independent 8-bit D-type latch paths-A-to-B and B-to-A-with separate Chip Enable (CEAB/CEBA), Latch Enable (LEAB/LEBA), and Output Enable (OEAB/OEBA) signals. Each path supports transparent latching on LE transition and high-impedance output control via OE.
It uses advanced BiCMOS technology to achieve ABT-class speed (tPLH/tPHL ≤ 4.8 ns at 3.3 V) while maintaining low power (ICCL ≤ 5 mA when outputs driven LOW). Input voltage range extends to 5.5 V, enabling direct interfacing with legacy 5V TTL logic without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - Ensures stable operation in 3.3V supply domains with ±0.3V margin. |
| IOH/IOL | −32 mA / +64 mA - Supports robust bus driving and sink capability for stub-loaded backplanes. |
| tPLH/tPHL | 1.3 ns (min) to 4.8 ns (max) at VCC = 3.3 V - Enables high-speed bidirectional data transfer in synchronous bus architectures. |
| VIH/VIL | 2.0 V / 0.8 V - Guarantees TTL-level input compatibility when interfacing with 5V logic families. |
| Bushold Current | ±75 µA at VI = 0.8 V/2.0 V - Holds floating inputs at valid logic levels without external resistors, reducing BOM count. |
| ICCZ | 0.19 mA - Low quiescent current during 3-STATE disable, minimizing standby power in idle bus segments. |
| Operating Temp | −40°C to +85°C - Qualified for extended industrial temperature environments including motor control and PLC I/O modules. |
Pinout & Package
SN74LVTH543NS is packaged in a 24-pin Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300-inch wide body (Package Number M24B), with standard lead pitch of 0.050 inch (1.27 mm) and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A0–A7 Data I/O | Side A bidirectional port: inputs when CEAB active and latched; outputs when OEAB active and latched. |
| 9, 10, 11, 12, 13, 14, 15, 16 | B0–B7 Data I/O | Side B bidirectional port: inputs when CEBA active and latched; outputs when OEBA active and latched. |
| 17 | OEAB | Active-low output enable for A→B direction - disables B-port drivers when HIGH. |
| 18 | LEAB | Latch enable for A→B path - captures A-port data on LOW-to-HIGH transition. |
| 19 | CEAB | Chip enable for A→B path - must be LOW to allow A-port data entry or B-port output. |
| 20 | GND | Ground reference for all internal circuitry and I/O buffers. |
| 21 | VCC | Primary 3.3V supply - powers internal logic and output drivers; tolerant to 5.5V inputs. |
| 22 | CEBA | Chip enable for B→A path - must be LOW to allow B-port data entry or A-port output. |
| 23 | LEBA | Latch enable for B→A path - captures B-port data on LOW-to-HIGH transition. |
| 24 | OEBA | Active-low output enable for B→A direction - disables A-port drivers when HIGH. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-Tolerant Inputs | Accepts 0–5.5 V input signals while powered from 3.3 V, enabling seamless integration into mixed-voltage backplane systems. |
| Bushold Inputs | Internally holds unused A/B port pins at valid logic levels, eliminating need for 16 external pull-up resistors in typical 8-bit bus applications. |
| Live Insertion Support | Power-up/down high-impedance behavior prevents bus contention during hot-plug operations in modular rack systems. |
| Dual Independent Control Paths | Separate CE/LE/OE per direction allows asynchronous latching and output gating - critical for handshake-based interprocessor communication. |
| High Drive Strength | 64 mA sink capability supports driving multiple TTL loads or long traces without signal degradation in industrial control buses. |
Applications
| Industrial Backplane Interface | Legacy System Bus Bridge |
|---|---|
Use Scenario: Connecting a modern 3.3V FPGA-based controller to an older 5V ISA or VME bus segment in factory automation hardware. IC Role / Device Role / Timing Role: Bidirectional registered transceiver providing voltage translation, data staging, and bus isolation between clock domains. Use Value: Eliminates discrete level shifters and pull-up networks while ensuring glitch-free handshaking via independent CE/LE/OE control. | Use Scenario: Interfacing a 3.3V microcontroller to a 5V parallel printer port or EPROM programming adapter. IC Role / Device Role / Timing Role: Octal latched buffer with 3-STATE outputs, synchronizing data transfers and preventing bus contention during write cycles. Use Value: Bushold inputs prevent floating data lines during reset or configuration, and ±32 mA/64 mA drive ensures reliable signal integrity over 12-inch ribbon cables. |
| Modular I/O Expansion Module | Programmable Logic Controller (PLC) I/O Hub |
Use Scenario: Hot-swap I/O daughter cards in a 3U CompactPCI chassis where modules may be inserted or removed under power. IC Role / Device Role / Timing Role: Registered transceiver managing bidirectional data flow between carrier backplane and module-local logic with live-insertion safety. Use Value: Power-up/down high-impedance state prevents bus glitches during insertion, and latch enables support deterministic data capture aligned to system clock edges. | Use Scenario: Isolating field-side 5V sensor/actuator signals from a 3.3V ARM-based PLC CPU board in harsh industrial environments. IC Role / Device Role / Timing Role: Voltage-tolerant octal register buffering digital I/O with ESD-hardened inputs (HBM > 2000 V) and latch-controlled sampling. Use Value: Latch Enable timing (tS = 0.4 ns, tH = 1.5 ns) supports tight setup/hold windows in real-time I/O scanning cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVT543PW | Same function and pinout; TSSOP-24 package (MTC24); slightly higher ICCZ (0.25 mA vs. 0.19 mA). | Preferred for space-constrained PCBs; requires rework of footprint but identical logic behavior and timing. | Select when board area is limited and TSSOP assembly capability exists. |
| SN74LVTH16543DGGR | 16-bit version in 48-pin TSSOP; double the channel count; same VCC range and bushold feature. | Used in wider data buses (e.g., 16-bit memory interfaces); not drop-in compatible due to pin count and layout changes. | Choose for new 16-bit designs requiring identical electrical behavior and enhanced density. |
Compared with SN74LVTH543NS, the 74LVT543PW offers identical functionality in a smaller TSSOP package but requires footprint redesign, while the SN74LVTH16543DGGR scales channel count for wider buses but demands full layout revision - neither is pin-compatible, making SN74LVTH543NS optimal for existing SOIC-24-based 8-bit bus upgrades.
Availability
SN74LVTH543NS is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus bridges, and modular I/O expansion requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN74LVTH543NS 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The LVTH logic family was engineered for high-speed, low-voltage 3.3V operation with backward compatibility to 5V TTL systems - targeting bus interface, backplane bridging, and hot-swap I/O applications in enterprise and industrial equipment.
FAQ
What is the maximum input voltage rating for SN74LVTH543NS?
The SN74LVTH543NS supports DC input voltages up to +7.0 V, with recommended operating input range of 0–5.5 V. This allows safe interfacing with 5V TTL logic while powered from a 3.3V supply. Absolute maximum rating applies regardless of VCC state, and exceeding +7.0 V risks permanent damage to input structures. The device's 5V-tolerant inputs are verified per datasheet Section 3 (Absolute Maximum Ratings) and Section 4 (Recommended Operating Conditions).
Does SN74LVTH543NS require external pull-up resistors on unused inputs?
No, SN74LVTH543NS does not require external pull-up resistors on unused inputs due to integrated bushold circuitry. Each data input (A0–A7, B0–B7) actively holds its last-valid logic state with ±75 µA drive strength at VI = 0.8 V/2.0 V. This feature is confirmed in the "Features" section and DC Electrical Characteristics table (II(HOLD)) of the official Fairchild DS012448 datasheet.
What is the propagation delay specification for SN74LVTH543NS at 3.3V?
At VCC = 3.3 V and TA = −40°C to +85°C, SN74LVTH543NS has a maximum propagation delay of 4.8 ns (tPLH) and 5.2 ns (tPHL) for data-to-outputs, and 6.4 ns (tPLH) and 6.6 ns (tPHL) for latch-enable-to-output transitions. These values are specified in the AC Electrical Characteristics table under "VCC = 3.3V ± 0.3V" conditions and reflect worst-case performance across temperature and voltage.
Can SN74LVTH543NS be used in hot-swap applications?
Yes, SN74LVTH543NS supports live insertion/extraction per its design. During power-up or power-down, outputs enter high-impedance state before supply rails stabilize, preventing bus contention. This behavior is explicitly documented in the "Features" list and verified by the Power Up/Down 3-STATE leakage current (IPU/PD) specification of ±100 µA in the DC Electrical Characteristics table.
What package type is used for SN74LVTH543NS?
SN74LVTH543NS is supplied in a 24-pin Small Outline Integrated Circuit (SOIC) package, JEDEC MS-013 compliant, 0.300-inch body width, with Package Number M24B. This is confirmed in the "Connection Diagram" and "Physical Dimensions" sections of the Fairchild DS012448 datasheet, and distinguishes it from the TSSOP variant (74LVTH543MTC).
SN74LVTH543NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVTH543NS FAQ
1.How can I place an order for SN74LVTH543NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH543NS 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 SN74LVTH543NS reliable?
The price and inventory of SN74LVTH543NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH543NS is usually 5 days.
3.What payment methods are accepted for SN74LVTH543NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH543NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVTH543NS?
SN74LVTH543NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH543NS 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 SN74LVTH543NS?
For technical support, including SN74LVTH543NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH543NS requirements.
6.How does Aetrix verify that SN74LVTH543NS is sourced from the original manufacturer or authorized distributors?
All SN74LVTH543NS 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 SN74LVTH543NS meets industry standards.
7.What is the process for return or replacement of SN74LVTH543NS?
All SN74LVTH543NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH543NS, 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 SN74LVTH543NS part is unused and in its original packaging.
Return procedure for SN74LVTH543NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVTH543NS Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
