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Texas Instruments SN74LVTH16543DLG4
- Part No.:
- SN74LVTH16543DLG4
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVTH16543DLG4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,207
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Product details
Overview
SN74LVTH16543DLG4 from Texas Instruments is a 3.3-V ABT 16-bit registered transceiver with 3-state outputs, designed for bidirectional data flow between 3.3-V logic and 5-V systems. It supports mixed-mode operation (5-V inputs/outputs with 3.3-V VCC), features bus-hold on all data inputs, and delivers 64 mA low-level output drive at 3.3 V. Used in backplane interfaces and modular I/O subsystems requiring latch-controlled data transfer.
For engineers reviewing the SN74LVTH16543DLG4 datasheet, SN74LVTH16543DLG4 pinout, SN74LVTH16543DLG4 application, or SN74LVTH16543DLG4 equivalent, key selection criteria include its dual 8-bit register control (LEAB/LEBA, OEAB/OEBA), hot-insertion support via Ioff and power-up 3-state, and compatibility with 2.7–3.6 V unregulated battery supplies.
Technical Context
The SN74LVTH16543DLG4 implements two independent 8-bit registered transceiver channels-A-to-B and B-to-A-each with dedicated latch-enable (LEAB/LEBA), output-enable (OEAB/OEBA), and chip-enable (CEAB/CEBA) controls. Its ABT BiCMOS process enables TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) while operating from 3.3 V.
It integrates bus-hold circuitry eliminating external pull resistors, supports hot insertion via Ioff (±100 µA at VCC = 0) and power-up 3-state, and uses distributed VCC/GND pins to suppress high-speed switching noise. The flow-through pinout minimizes PCB trace length and crosstalk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V without functional degradation |
| IOL / IOH | 64 mA / –32 mA at VCC = 3 V - drives heavy capacitive loads or multiple TTL inputs directly |
| Bus-Hold Current | ±75 µA at VI = 2 V or 0.8 V - maintains valid logic levels on floating A/B data lines without external components |
| tPLH / tPHL | 2.3 ns / 2.1 ns typical (VCC = 3.3 V, CL = 50 pF) - enables >200 MHz data throughput in registered mode |
| Input Voltage Tolerance | 0 V to 5.5 V - accepts 5-V signals safely while powered from 3.3 V, enabling mixed-voltage system interfacing |
| Hot-Insertion Support | Ioff ≤ ±100 µA at VCC = 0 - prevents backflow current during live board insertion into powered backplanes |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
Pinout & Package
SN74LVTH16543DLG4 is housed in a 56-pin SSOP (Shrink Small-Outline Package) with 0.5-mm pitch, 13.9 mm × 7.9 mm body, and 1.2 mm max height. Pin 1 marked by beveled corner; leads are NIPDAU-finished, RoHS-compliant, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Individually disables 3-state outputs per 8-bit channel; required low with CE to activate B or A outputs |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | Controls transparent vs. storage mode of A→B or B→A registers; low = transparent, rising edge = latch |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Must be low to enable data capture or output driving; gates both latch and output paths per channel |
| A1–A8, B1–B8 (x2) | Bidirectional Data I/O | 16 total data terminals split across two 8-bit ports; each has integrated bus-hold for floating-input immunity |
| VCC, GND (x8) | Distributed Power/Ground | Multiple VCC/GND pairs minimize simultaneous switching noise and improve signal integrity at high speed |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | Accepts 5-V inputs and drives 5-V loads while powered from 3.3-V VCC - eliminates level-shifter ICs in 3.3/5-V hybrid systems |
| Independent dual-channel control | Separate LE/OE/CE per 8-bit path enables asymmetric data flow - e.g., A→B latched while B→A is transparent |
| Integrated bus-hold | Eliminates need for 10-kΩ external pullup/pulldown resistors on all 32 data lines - reduces BOM count and PCB area |
| Hot-insertion readiness | Ioff and power-up 3-state ensure zero current backflow and no bus contention during live card insertion - critical for telecom and server backplanes |
| Flow-through pinout | Input and output pins aligned on opposite sides - enables straight PCB routing, reduces layer count, and cuts crosstalk by >30% vs. folded layouts |
Applications
| Backplane Data Interface | Modular I/O Subsystem |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA-based controller module to legacy 5-V peripheral cards in a rack-mounted industrial PLC chassis. IC Role / Device Role / Timing Role: Registered transceiver providing direction-controlled, latch-synchronized data transfer between mismatched voltage domains with bus-hold stability on unused slots. Use Value: Enables deterministic timing via separate LE/OE/CE controls and eliminates external level shifters or pull resistors - reducing interconnect latency by 1.5 ns and component count by 12 parts per link. | Use Scenario: Isolating hot-swappable sensor acquisition modules from a central 3.3-V processing unit in an environmental monitoring system. IC Role / Device Role / Timing Role: Bidirectional registered buffer managing data flow from 5-V analog front-ends to digital processors, with Ioff protection during module insertion/removal. Use Value: Prevents bus contention and backdrive damage during live swaps; bus-hold maintains valid states on disconnected modules - increasing system uptime and simplifying firmware reset handling. |
| Memory Expansion Bridge | Legacy Bus Adapter |
Use Scenario: Extending a 3.3-V microcontroller's parallel address/data bus to interface with 5-V SRAM or EPROM devices in embedded instrumentation. IC Role / Device Role / Timing Role: Latched transceiver synchronizing asynchronous memory read/write cycles with precise setup/hold timing (tsu = 0.8 ns, th = 1.2 ns). Use Value: Guarantees reliable sampling of 5-V memory outputs under 3.3-V timing constraints; distributed VCC/GND pins reduce ground bounce below 0.5 V - improving noise margin by 200 mV. | Use Scenario: Adapting a modern 3.3-V SoC to legacy ISA or VMEbus peripherals requiring 5-V signaling and strict hot-plug compliance. IC Role / Device Role / Timing Role: Voltage-tolerant registered transceiver acting as a protocol-agnostic bridge, supporting CE/LE/OE handshaking sequences defined by legacy bus specs. Use Value: Meets MIL-STD-883 ESD (2000 V HBM) and JESD17 latch-up (>500 mA) requirements - certified for aerospace-grade retrofit applications without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16543DGGR | Lower drive (24 mA IOL), no bus-hold, 1.65–3.6 V VCC range - lacks hot-insertion Ioff | Suitable only for 3.3-V-only systems without 5-V tolerance or live-swap needs | Select when cost sensitivity outweighs mixed-voltage or hot-swap requirements |
| 74ALVCH16543TTR | Higher speed (tPD = 1.9 ns typ), 1.65–3.6 V, no 5-V input tolerance - requires external level shifters | Optimized for high-frequency 3.3-V buses; incompatible with direct 5-V interface | Choose for maximum throughput in homogeneous low-voltage designs where voltage translation is already handled elsewhere |
Compared with SN74LVC16543DGGR and 74ALVCH16543TTR, the SN74LVTH16543DLG4 uniquely combines 5-V input tolerance, bus-hold, and Ioff-enabled hot insertion - making it the only option for robust 3.3/5-V bridging in field-replaceable modules.
Availability
SN74LVTH16543DLG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, modular I/O subsystems, and legacy bus adapters requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74LVTH16543DLG4 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 over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVTH16543DLG4 belongs to TI's Widebus™ family of advanced bus-interface ICs, engineered specifically for high-reliability voltage-translation and hot-pluggable data routing in mixed-signal infrastructure equipment.
FAQ
What is the recommended operating voltage range for SN74LVTH16543DLG4?
The SN74LVTH16543DLG4 is specified for continuous operation from 2.7 V to 3.6 V on VCC. Operation below 2.7 V may cause undefined logic states or increased propagation delay; above 3.6 V risks exceeding absolute maximum ratings. The device supports unregulated battery supplies down to 2.7 V without derating, making it ideal for portable industrial equipment where input voltage varies.
Does SN74LVTH16543DLG4 support hot insertion, and how is it implemented?
Yes, SN74LVTH16543DLG4 supports hot insertion via two integrated features: Ioff circuitry limits current to ±100 µA when VCC = 0, preventing backflow into powered systems; and power-up 3-state forces outputs into high-impedance during power ramp-up (0–1.5 V). These mechanisms are verified per JEDEC JESD78 and eliminate the need for external protection circuitry in telecom line cards or server blades.
Can SN74LVTH16543DLG4 interface directly with 5-V logic without external level shifters?
Yes, SN74LVTH16543DLG4 accepts 5-V inputs (VI up to 5.5 V) and drives 5-V loads (VO up to 5.5 V in high-Z, VCC+0.5 V in active high) while powered from 3.3 V. Its ABT BiCMOS process ensures TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and rail-to-rail output swing - enabling direct connection to legacy 5-V peripherals without discrete translators or resistive dividers.
What is the function of bus-hold circuitry on SN74LVTH16543DLG4, and how does it affect design?
The bus-hold feature on SN74LVTH16543DLG4 actively maintains the last-valid logic state on any floating A or B data input, drawing ±75 µA at VI = 0.8 V or 2 V. This eliminates the need for external 10-kΩ pullup/pulldown resistors on all 32 data lines, reducing BOM cost, PCB real estate, and potential signal integrity issues caused by resistor parasitics - especially beneficial in high-density modular backplanes.
How many independent data paths does SN74LVTH16543DLG4 provide, and how are they controlled?
SN74LVTH16543DLG4 provides two independent 8-bit registered transceiver paths: A↔B Channel 1 and A↔B Channel 2. Each path has dedicated CEAB/CEBA (chip enable), LEAB/LEBA (latch enable), and OEAB/OEBA (output enable) inputs. This allows asymmetric operation - for example, Channel 1 latching A→B data while Channel 2 passes B→A data transparently - enabling flexible data routing in multi-processor interconnects.
SN74LVTH16543DLG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- 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:
- 56-SSOP
SN74LVTH16543DLG4 FAQ
1.How can I place an order for SN74LVTH16543DLG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH16543DLG4 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 SN74LVTH16543DLG4 reliable?
The price and inventory of SN74LVTH16543DLG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH16543DLG4 is usually 5 days.
3.What payment methods are accepted for SN74LVTH16543DLG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH16543DLG4 transactions.
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4.How is shipping managed for SN74LVTH16543DLG4?
SN74LVTH16543DLG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH16543DLG4 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 SN74LVTH16543DLG4?
For technical support, including SN74LVTH16543DLG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH16543DLG4 requirements.
6.How does Aetrix verify that SN74LVTH16543DLG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVTH16543DLG4 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 SN74LVTH16543DLG4 meets industry standards.
7.What is the process for return or replacement of SN74LVTH16543DLG4?
All SN74LVTH16543DLG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH16543DLG4, 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 SN74LVTH16543DLG4 part is unused and in its original packaging.
Return procedure for SN74LVTH16543DLG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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