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Texas Instruments SN74LVCH16543ADGGR
- Part No.:
- SN74LVCH16543ADGGR
- Manufacturer:
- Texas Instruments
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74LVCH16543ADGGR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,277
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Product details
Overview
SN74LVCH16543ADGGR from Texas Instruments is a 16-bit registered transceiver with 3-state outputs, designed for bidirectional data flow between two 8-bit buses or as a single 16-bit transceiver. It operates from 1.65 V to 3.6 V, supports 5.5-V-tolerant inputs, delivers 5.4 ns max propagation delay at 3.3 V, and features bus-hold circuitry and Ioff partial-power-down capability - used in mixed-voltage memory interfaces and FPGA-to-ASIC interconnects.
For engineers reviewing the SN74LVCH16543ADGGR datasheet, SN74LVCH16543ADGGR pinout, SN74LVCH16543ADGGR application, or SN74LVCH16543ADGGR equivalent, key selection criteria include voltage translation (3.3 V/5 V), latch-enable independence per 8-bit section, 3-state output control granularity, bus-hold elimination of external resistors, and TSSOP-56 thermal performance under industrial temperature range (–40°C to 85°C).
Technical Context
This device implements dual independent 8-bit registered transceivers, each with separate CEAB/CEBA (chip enable), LEAB/LEBA (latch enable), and OEAB/OEBA (output enable) controls - enabling asynchronous latching and output gating per direction. Its logic diagram confirms noninverting signal path with transparent latch behavior when LE is low and storage on LE↑ edge.
It supports mixed-mode operation: A- and B-side I/O tolerate up to 5.5 V while VCC remains at 1.65–3.6 V, allowing safe interfacing between 3.3-V logic and legacy 5-V systems. Ioff protection disables outputs during power-down, preventing backflow current, and bus-hold circuitry maintains valid logic levels on floating data lines without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables direct integration into modern low-voltage digital systems including battery-powered and FPGA I/O banks. |
| Input Voltage Tolerance | Up to 5.5 V - allows connection to 5-V peripherals without level-shifting components in mixed-voltage designs. |
| Max tpd | 5.4 ns at VCC = 3.3 V - ensures timing compliance in high-speed 8/16-bit parallel bus applications such as memory expansion or processor co-processor links. |
| Ioff Support | Active during power-down - prevents damaging current backflow when VCC = 0 V, critical for hot-swap and partial-power-down architectures. |
| Bus-Hold Current | ±45 µA to ±75 µA depending on VCC - eliminates need for external pullup/pulldown resistors on unused data lines, reducing BOM count and layout complexity. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements for handling and board-level reliability. |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments including factory automation and telecom infrastructure. |
Pinout & Package
TSSOP-56 (DGG) package: 13.9 mm × 6.1 mm × 1.2 mm body, 0.5-mm pitch, lead-free NiPdAu finish, MSL Level-1, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Individually gates 3-state outputs for each 8-bit segment in A→B or B→A direction - enables dynamic bus sharing and contention avoidance. |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | Controls transparency/storage mode of internal registers - low enables real-time pass-through; rising edge captures and holds data. |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Enables data capture or output drive only when asserted - provides hierarchical control over register activation and output driver readiness. |
| 1A1–1A8, 2A1–2A8 | A-side Data Inputs/Outputs | First and second 8-bit data ports for A bus - support bidirectional flow with bus-hold on all pins. |
| 1B1–1B8, 2B1–2B8 | B-side Data Inputs/Outputs | Corresponding B-side ports - electrically identical to A-side, fully symmetrical for flexible routing. |
| VCC, GND | Power and Ground | Multiple distributed VCC/GND pairs (12 total) minimize switching noise and improve signal integrity across high-speed parallel paths. |
Key Features
| Feature | Design Value |
|---|---|
| Widebus™ Architecture | Optimized for high-density, low-skew parallel bus applications - reduces interconnect skew and improves timing margin in multi-bit synchronous transfers. |
| Mixed-Mode Signal Operation | Supports 5-V input signals with 3.3-V VCC - enables seamless bridging between legacy 5-V logic and modern low-voltage FPGAs or microcontrollers. |
| Independent 8-Bit Control | Dual CE/LE/OE sets allow concurrent but isolated operation of two 8-bit channels - simplifies partitioned data movement in memory-mapped I/O or DMA controller interfaces. |
| Bus-Hold Circuitry | Eliminates external pull resistors on all data inputs - reduces PCB area, assembly cost, and potential noise coupling from resistor networks. |
| Low Ground Bounce (VOLP) | Typical < 0.8 V at VCC = 3.3 V - maintains signal fidelity during simultaneous switching of multiple outputs, critical for stable bus arbitration. |
Applications
| Memory Expansion Interface | FPGA-to-Microcontroller Bridge |
|---|---|
Use Scenario: Connecting an 8-bit or 16-bit SRAM/ROM to a microcontroller with limited I/O or mismatched voltage domains. IC Role / Device Role / Timing Role: Registered transceiver providing latch-controlled, direction-gated data transfer with voltage translation between 3.3-V MCU and 5-V memory devices. Use Value: Eliminates need for discrete level shifters and external latches; bus-hold prevents floating address/data lines during reset or standby. | Use Scenario: Interfacing a Xilinx Artix-7 FPGA's 16-bit user I/O bank to an ARM Cortex-M7 microcontroller operating at different supply voltages. IC Role / Device Role / Timing Role: Bidirectional registered buffer managing handshake-controlled data exchange with independent clock domain isolation via latch enables. Use Value: Enables deterministic setup/hold timing via LE-controlled capture; Ioff protects FPGA I/O during MCU power cycling. |
| Industrial PLC Backplane Link | Test Equipment Digital I/O Module |
Use Scenario: Routing configurable 16-bit parallel I/O between modular PLC CPU and I/O expansion cards across varying supply rails. IC Role / Device Role / Timing Role: Robust transceiver with ESD-hardened I/O and industrial temp rating, supporting hot-plug detection via CE-driven enable sequencing. Use Value: Withstands repeated insertion cycles and ESD events; bus-hold maintains known state during card insertion/removal. | Use Scenario: Building a programmable digital pattern generator/analyzer module requiring precise timing control and 5-V TTL compatibility. IC Role / Device Role / Timing Role: Registered interface IC capturing test vectors synchronously and driving DUT signals with controlled 3-state output timing. Use Value: 5.4 ns tpd ensures sub-200 MHz timing resolution; independent OE control enables glitch-free signal sourcing/sinking transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16245ADGGR | No latch registers; unregistered bus transceiver with 3-state outputs only. | Suitable for simple level-shifted data forwarding without storage - lacks LE-based sampling or hold functionality. | Select when timing-critical latching is unnecessary and lower propagation delay (4.2 ns) is prioritized over data retention. |
| SN74AVC16T245DGGR | Auto-direction sensing (no LE/CE); higher speed (3.2 ns tpd); supports 1.2–3.6 V VCC. | Used where direction is determined by data flow (e.g., USB PHY interfaces); not suitable for explicit latch-controlled buffering. | Choose for self-timed bidirectional buses; avoid when deterministic LE-triggered capture or independent 8-bit control is required. |
Compared with SN74LVC16245ADGGR and SN74AVC16T245DGGR, the SN74LVCH16543ADGGR uniquely provides dual 8-bit registered latching with independent enable controls - essential for synchronous data capture in memory-mapped or DMA-driven systems where intermediate storage and directional decoupling are mandatory.
Availability
SN74LVCH16543ADGGR is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-to-ASIC interconnects, and memory expansion interfaces requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSSOP packaging.
Supply support for SN74LVCH16543ADGGR 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 leadership in high-reliability interface and logic ICs.
The SN74LVCH16543ADGGR belongs to TI's Widebus™ family - engineered for high-speed, low-voltage parallel bus applications in industrial, computing, and communications infrastructure where signal integrity, voltage translation, and latch-controlled timing are critical.
FAQ
What is the maximum operating frequency supported by the SN74LVCH16543ADGGR?
The SN74LVCH16543ADGGR does not specify a maximum clock frequency directly, but its 5.4 ns maximum propagation delay (tpd) at 3.3 V implies reliable operation up to approximately 185 MHz for setup/hold-constrained synchronous systems. Actual usable frequency depends on system-level timing margins, PCB layout, and load capacitance - verified using the provided switching characteristics table and load circuit in Figure 1 of the datasheet. The SN74LVCH16543ADGGR is optimized for burst-mode parallel transfers rather than continuous clocked operation.
Does the SN74LVCH16543ADGGR support true 5-V operation on VCC?
No, the SN74LVCH16543ADGGR requires VCC between 1.65 V and 3.6 V. However, its inputs tolerate up to 5.5 V regardless of VCC level - enabling safe connection to 5-V signal sources while powered from 3.3 V or lower. This makes the SN74LVCH16543ADGGR ideal for voltage translation, but it must not be supplied with 5 V on VCC, as that exceeds absolute maximum ratings and risks permanent damage.
How does bus-hold functionality work on the SN74LVCH16543ADGGR, and can it be disabled?
Bus-hold on the SN74LVCH16543ADGGR is an internal weak feedback circuit that maintains the last-valid logic state on unused A- or B-side data inputs - eliminating need for external pullup/pulldown resistors. It operates independently of OE or DIR signals and cannot be disabled via control pins. Using external resistors with active bus-hold is discouraged, as it may cause contention or increased power draw. The SN74LVCH16543ADGGR's bus-hold current ranges from ±45 µA to ±75 µA depending on VCC and input voltage.
Can the SN74LVCH16543ADGGR be used as a single 16-bit transceiver, or is dual 8-bit operation mandatory?
The SN74LVCH16543ADGGR supports both configurations: it can operate as one unified 16-bit transceiver (using shared or coordinated CE/LE/OE signals) or as two independent 8-bit transceivers (with separate CEAB/LEAB/OEAB and CEBA/LEBA/OEBA controls). The functional diagram and truth table confirm full symmetry and independent enable logic per section. This flexibility allows designers to optimize for either bandwidth consolidation or channel isolation - e.g., using one 8-bit section for address and the other for data in memory interfaces. The SN74LVCH16543ADGGR's pinout and internal architecture explicitly support both modes without hardware modification.
What is the thermal performance of the SN74LVCH16543ADGGR in the TSSOP-56 (DGG) package?
The SN74LVCH16543ADGGR in TSSOP-56 (DGG) package has a junction-to-ambient thermal resistance (θJA) of 48°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC high-efficiency board conditions (2-layer board, 1-in² copper). In typical industrial PCB layouts with moderate copper pour, the device sustains continuous operation at full drive strength within its –40°C to +85°C ambient range. Derating is recommended above 70°C ambient if driving 24 mA per output continuously. Thermal performance is further enhanced by the 12 dedicated VCC/GND pairs distributing power delivery and reducing localized heating.
SN74LVCH16543ADGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
SN74LVCH16543ADGGR FAQ
1.How can I place an order for SN74LVCH16543ADGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH16543ADGGR 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 SN74LVCH16543ADGGR reliable?
The price and inventory of SN74LVCH16543ADGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH16543ADGGR is usually 5 days.
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Once your SN74LVCH16543ADGGR 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 SN74LVCH16543ADGGR?
For technical support, including SN74LVCH16543ADGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH16543ADGGR requirements.
6.How does Aetrix verify that SN74LVCH16543ADGGR is sourced from the original manufacturer or authorized distributors?
All SN74LVCH16543ADGGR 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 SN74LVCH16543ADGGR meets industry standards.
7.What is the process for return or replacement of SN74LVCH16543ADGGR?
All SN74LVCH16543ADGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH16543ADGGR, 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 SN74LVCH16543ADGGR part is unused and in its original packaging.
Return procedure for SN74LVCH16543ADGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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