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Texas Instruments SN74LVTH16543DGG
- Part No.:
- SN74LVTH16543DGG
- Manufacturer:
- Texas Instruments
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74LVTH16543DGG.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,465
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Product details
Overview
SN74LVTH16543 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 TTL systems. It supports mixed-mode operation (5-V inputs/outputs with 3.3-V VCC), features bus-hold on all data inputs, and provides independent A↔B control via dual latch-enable and output-enable pins per 8-bit section. Used in backplane interfaces and voltage-level-translating bus systems.
For engineers reviewing the SN74LVTH16543 datasheet, SN74LVTH16543 pinout, SN74LVTH16543 application, or SN74LVTH16543 equivalent, this page delivers verified electrical specs, thermal performance (θJA = 81°C/W), hot-insertion support via Ioff and power-up 3-state, bus-hold functionality, and timing parameters including tPLH/tPHL ≤ 3.7 ns at VCC = 3.3 V.
Technical Context
The SN74LVTH16543 implements two independent 8-bit registered transceiver sections, each with separate CEAB/CEBA, LEAB/LEBA, and OEAB/OEBA controls-enabling asymmetric direction management. Its Advanced BiCMOS Technology (ABT) ensures low static power dissipation while maintaining TTL-compatible thresholds at 3.3-V supply.
It supports unregulated battery operation down to 2.7 V, includes distributed VCC/GND pinning to suppress high-speed switching noise, and features flow-through architecture for optimized PCB layout. Latch-up immunity exceeds 500 mA per JESD 17, and ESD protection meets 2000 V (MIL-STD-883) and 200 V (machine model).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports wide-input-voltage battery rails and tolerates supply droop during transient load conditions |
| IOL (max) | 64 mA - drives heavy capacitive loads or multiple TTL inputs without external buffers |
| tPLH/tPHL | ≤ 3.7 ns at VCC = 3.3 V, CL = 50 pF - enables high-speed synchronous bus operation up to ~200 MHz effective data rate |
| Bus-Hold Current | ±75 µA at VCC = 3 V - eliminates need for external pullup/pulldown resistors on floating data lines |
| Ioff | ±100 µA at VCC = 0 V - prevents backflow current during hot insertion or partial power-down |
| θJA | 81°C/W (DGG package) - defines thermal derating limit for continuous 16-bit switching at ambient ≤ 70°C |
| VIL/VIH | 0.8 V / 2.0 V - compatible with standard TTL input thresholds while operating from 3.3-V supply |
Pinout & Package
SN74LVTH16543 is packaged in a 56-pin Thin Shrink Small-Outline (DGG) package with 0.5-mm pitch, 10.0 mm × 12.5 mm body size, and exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Controls 3-state output drivers per 8-bit section; asserts high-impedance when high |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | Enables transparent latching of A→B or B→A data on low-to-high transition |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Gates data flow into latches; must be low for register capture or output activation |
| A1–A8, B1–B8 (x2 sections) | Bidirectional Data I/O | 16 total data terminals with bus-hold circuitry; tolerate 5-V signals with 3.3-V VCC |
| VCC, GND (x8 pins) | Distributed Power/Ground | Minimizes simultaneous switching noise via interleaved VCC/GND pin placement |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Accepts 5-V inputs and drives 5-V loads while powered from 3.3-V rail - eliminates level-shifter ICs in 3.3/5-V interface designs |
| Hot-insertion support | Ioff and power-up 3-state prevent backfeed and bus contention during live board insertion - critical for modular backplanes |
| Bus-hold on all data inputs | Active internal keeper circuits maintain valid logic state on unused/floating lines - reduces BOM count and layout complexity |
| Flow-through pinout | Input and output pins aligned across package edges - simplifies layer routing and minimizes trace skew in high-speed parallel buses |
| Distributed VCC/GND | Eight dedicated power/ground pairs reduce ground bounce (VOLP < 0.8 V) and improve signal integrity at >100 MHz toggle rates |
Applications
| Backplane Interface | Industrial PLC I/O Module |
|---|---|
Use Scenario: Bidirectional data transfer between 3.3-V controller FPGA and legacy 5-V peripheral cards in modular rack systems. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, glitch-free data handshaking with independent A/B enable control per 8-bit lane. Use Value: Eliminates external level shifters and pull resistors while supporting hot-swap maintenance without system shutdown. |
Use Scenario: Isolating and translating control signals between 3.3-V microcontroller and 5-V relay driver banks in programmable logic controllers. IC Role / Device Role / Timing Role: Voltage-tolerant registered buffer with bus-hold ensuring deterministic startup behavior after power cycling. Use Value: Prevents undefined I/O states during brown-out conditions and reduces firmware initialization overhead. |
| Telecom Line Card | Test Equipment Backplane |
Use Scenario: Interfacing 3.3-V packet processor ASIC with 5-V analog front-end and timing distribution circuits in carrier-grade line cards. IC Role / Device Role / Timing Role: Low-skew, registered transceiver enabling precise setup/hold timing (tsu = 0.5 ns, th = 1.2 ns) for synchronous bus transfers. Use Value: Meets strict jitter budgets for TDM and packet-based timing synchronization without added delay compensation logic. |
Use Scenario: High-reliability data path between 3.3-V test controller and 5-V DUT interface boards in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Robust registered bus interface with latch-up immunity (>500 mA) and ESD hardening (2000 V HBM) for production floor environments. Use Value: Ensures long-term operational stability under repeated probe contact, ESD events, and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVT16543DGGR | Same pinout and function but uses LVT (not LVTH) process - lower drive strength (IOL = 32 mA), no bus-hold | Requires external pull resistors; unsuitable for floating-bus or hot-swap scenarios where bus-hold is needed | Select SN74LVTH16543 when bus-hold or higher drive (64 mA) is required; choose SN74LVT16543 for lower-power, non-hot-swap applications |
| 74ALVC164245 | Non-latched, direction-controlled transceiver with auto-direction sensing; no register stage or LE inputs | Lacks registered timing control - cannot meet setup/hold requirements for synchronous bus protocols like PCI-X or custom parallel interfaces | Use 74ALVC164245 only for asynchronous, direction-flexible data paths; retain SN74LVTH16543 for clocked, deterministic transfers |
Compared with SN74LVT16543DGGR and 74ALVC164245, the SN74LVTH16543 uniquely combines registered data capture, bus-hold, hot-insertion support, and 64-mA drive - making it the sole choice for synchronous, robust 3.3/5-V bus bridging where deterministic timing and floating-line immunity are mandatory.
Availability
SN74LVTH16543 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and test equipment applications requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.
Supply support for SN74LVTH16543 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 SN74LVTH16543 belongs to TI's Widebus™ family of advanced 3.3-V ABT logic devices, engineered specifically for mixed-voltage system interconnects requiring high-speed, low-noise, and hot-plug-capable bus interfaces.
FAQ
What is the maximum operating temperature range for the SN74LVTH16543?
The SN74LVTH16543 is characterized for operation from –40°C to +85°C. This commercial temperature grade makes it suitable for industrial control panels, telecom line cards, and embedded instrumentation where ambient temperatures remain within this envelope. The military-grade SN54LVTH16543 variant extends to –55°C to +125°C, but SN74LVTH16543 itself is not rated beyond +85°C.
Does the SN74LVTH16543 support true 5-V tolerant inputs with 3.3-V VCC?
Yes, the SN74LVTH16543 supports 5-V input voltages with VCC = 3.3 V, as confirmed by its absolute maximum input voltage rating of 7 V and recommended VI specification of 5.5 V. Input clamp current is limited to ±50 mA, and the device maintains valid logic thresholds (VIL = 0.8 V, VIH = 2.0 V) under these conditions - enabling direct connection to 5-V TTL sources without external attenuation.
Can the SN74LVTH16543 be used in hot-swap applications?
Yes, the SN74LVTH16543 is explicitly designed for hot-insertion use cases. Its Ioff circuitry disables outputs when VCC = 0 V, preventing damaging back-current, and its power-up 3-state feature forces outputs into high-impedance during power ramp-up/down. These capabilities are validated per JEDEC standards and documented in the SCBS699D datasheet under "Hot Insertion Support".
What is the purpose of the bus-hold circuitry on the SN74LVTH16543?
The bus-hold circuitry on the SN74LVTH16543 actively maintains the last-valid logic state on any unused or floating data input (A or B ports), eliminating the need for external pullup or pulldown resistors. With ±75 µA hold current at VCC = 3 V, it ensures deterministic startup and avoids metastability in systems with partially populated connectors or intermittent signal connections - a key advantage in modular backplane designs.
How does the SN74LVTH16543 handle power sequencing when VCC is below 1.5 V?
When VCC is between 0 V and 1.5 V, the SN74LVTH16543 automatically enters a high-impedance state during power-up or power-down sequences. However, to guarantee high-impedance above 1.5 V, the OE (output-enable) pins must be tied to VCC via a pullup resistor - minimum value determined by the driver's current-sinking capability - as specified in the functional description of the SCBS699D datasheet.
SN74LVTH16543DGG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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-TSSOP
SN74LVTH16543DGG FAQ
1.How can I place an order for SN74LVTH16543DGG through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH16543DGG 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 SN74LVTH16543DGG reliable?
The price and inventory of SN74LVTH16543DGG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH16543DGG is usually 5 days.
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Once your SN74LVTH16543DGG 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 SN74LVTH16543DGG?
For technical support, including SN74LVTH16543DGG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH16543DGG requirements.
6.How does Aetrix verify that SN74LVTH16543DGG is sourced from the original manufacturer or authorized distributors?
All SN74LVTH16543DGG 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 SN74LVTH16543DGG meets industry standards.
7.What is the process for return or replacement of SN74LVTH16543DGG?
All SN74LVTH16543DGG units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH16543DGG, 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 SN74LVTH16543DGG part is unused and in its original packaging.
Return procedure for SN74LVTH16543DGG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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