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Nexperia USA Inc. 74ALVCH16646DGGS
- Part No.:
- 74ALVCH16646DGGS
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74ALVCH16646DGGS.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,162
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Product details
Overview
74ALVCH16646DGGS from Nexperia is a 16-bit non-inverting bus transceiver/register with 3-state outputs, dual D-type flip-flop registers per port, and multiplexed real-time/registered data routing. It operates from 2.3 V to 3.6 V, delivers ±24 mA output drive at 3.0 V, supports −40 °C to +85 °C ambient, and integrates bus-hold on all data inputs for floating-input immunity. It enables bidirectional data flow between two 16-bit buses (A and B) in systems requiring registered buffering, such as memory-mapped I/O expansion in industrial controllers.
For engineers reviewing the 74ALVCH16646DGGS datasheet, 74ALVCH16646DGGS pinout, 74ALVCH16646DGGS application, or 74ALVCH16646DGGS equivalent, this device serves as a high-speed, low-power, register-enhanced transceiver for synchronous bus isolation, level translation between 2.5 V/3.3 V domains, and glitch-free data capture in FPGA-to-ASIC interconnects.
Technical Context
The 74ALVCH16646DGGS implements two independent 8-bit transceiver/register sections (1x and 2x), each with separate clock (nCPAB/nCPBA), direction (nDIR), output enable (nOE), and select (nSAB/nSBA) controls. Its logic supports simultaneous storage of A- and B-bus data during isolation mode (nOE = HIGH), and selective routing of either stored or transparent data to outputs based on nSAB/nSBA state.
It uses CMOS technology with MULTIBYTE™ flow-through pinout, low-inductance multiple VCC/GND pins to suppress ground bounce, and active bus-hold circuitry eliminating external pull-ups on unused inputs. Propagation delays range from 1.0 ns to 5.3 ns depending on supply voltage and signal path (e.g., tpd = 2.6 ns typical from nAn to nBn at VCC = 3.3 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.3 V to 3.6 V - Enables direct interface with both 2.5 V and 3.3 V logic families without level shifters. |
| Output Drive | ±24 mA at VCC = 3.0 V - Sufficient to drive 50 Ω transmission lines at 85 °C, supporting point-to-point high-speed routing. |
| Propagation Delay | 1.0–3.9 ns (nAn→nBn, VCC = 3.0–3.6 V) - Ensures sub-4 ns timing margin for 100+ MHz bus operation with 30–50 pF loads. |
| Bus-Hold Current | IBHL = 75–150 μA (LOW), IBHH = −75 to −175 μA (HIGH) at VCC = 3.0 V - Actively maintains valid logic levels on unconnected data inputs without external resistors. |
| Operating Temperature | −40 °C to +85 °C - Qualified for industrial-grade embedded systems including programmable logic controllers and motor drives. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Meets JEDEC JS-001/JS-002 Class 2/C3, reducing board-level ESD hardening requirements. |
| Max Clock Frequency | 320 MHz per channel (VCC = 3.0–3.6 V) - Supports high-throughput register clocking for burst-mode data capture in test equipment interfaces. |
Pinout & Package
TSSOP56 plastic thin shrink small outline package (SOT364-1), 56-pin, 6.1 mm body width, 0.5 mm pitch, with 8 GND and 4 VCC pins for low-noise power distribution.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A0–1A7, 2A0–2A7 | Data I/O (Port A) | Bi-directional bus A terminals; input when driving B, output when driven by B; always enabled for register capture. |
| 1B0–1B7, 2B0–2B7 | Data I/O (Port B) | Bi-directional bus B terminals; function mirrors Port A with independent control signals. |
| 1OE, 2OE | Output Enable (active-LOW) | Disables all outputs to high-impedance; input functions remain active for register loading even when outputs are off. |
| 1DIR, 2DIR | Direction Control | Determines data flow direction: LOW = B→A, HIGH = A→B, only active when nOE = LOW. |
| 1CPAB, 2CPAB | Register Clock A→B | LOW-to-HIGH transition latches Port A data into internal register for later B-bus output or multiplexing. |
| 1CPBA, 2CPBA | Register Clock B→A | LOW-to-HIGH transition latches Port B data into internal register for later A-bus output or multiplexing. |
| 1SAB, 2SAB | Select A-to-B Source | HIGH selects registered Port A data; LOW selects real-time Port A data for output to Port B. |
| 1SBA, 2SBA | Select B-to-A Source | HIGH selects registered Port B data; LOW selects real-time Port B data for output to Port A. |
| GND (Pins 4, 11, 18, 25, 32, 39, 46, 53) | Ground Reference | Eight dedicated ground pins minimize ground loop inductance and reduce switching noise coupling across 16-bit channels. |
| VCC (Pins 7, 22, 35, 50) | Supply Voltage | Four distributed VCC pins ensure uniform power delivery and lower impedance supply paths for all 32 I/Os. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2.3 V to 3.6 V operation allows single-supply compatibility with legacy 2.5 V and modern 3.3 V systems without voltage translation. |
| MULTIBYTE™ Flow-Through Pinout | Standardized A/B pin pairing (e.g., 1A0/1B0 adjacent) simplifies PCB layout, reduces trace crossovers, and maintains signal integrity in dense 16-bit buses. |
| Dual Register Architecture | Independent A→B and B→A registers enable concurrent capture and forwarding-critical for handshake-free data staging in DMA controllers. |
| Active Bus-Hold Circuitry | Eliminates need for external pull-up/down resistors on unused data lines, reducing BOM count and board space in modular backplane designs. |
| Low Ground Bounce | Multiple low-inductance VCC/GND pins suppress simultaneous switching noise, enabling reliable operation in mixed-signal environments like PLC I/O modules. |
Applications
| Industrial PLC Backplane Interface | FPGA-to-Microcontroller Data Bridge |
|---|---|
|
Use Scenario: Isolating and synchronizing data between a fieldbus controller (Modbus RTU) and a local microcontroller managing analog I/O modules. IC Role / Device Role / Timing Role: Acts as a registered transceiver that captures microcontroller writes into internal registers before forwarding to the fieldbus ASIC, decoupling timing domains and preventing metastability. Use Value: Enables deterministic 16-bit data transfer at up to 320 MHz clock rate while maintaining signal integrity across noisy industrial backplanes via bus-hold and low-ground-bounce design. |
Use Scenario: Interfacing a Xilinx Artix-7 FPGA's user I/O bank (3.3 V) with an ARM Cortex-M7 MCU (2.5 V) in a real-time motion control system. IC Role / Device Role / Timing Role: Provides bidirectional voltage-level translation and registered buffering, allowing the FPGA to sample MCU status flags synchronously while driving command words with setup/hold compliance. Use Value: Eliminates external level shifters and discrete latches; ±24 mA drive ensures clean 50 Ω line termination into the MCU's 30 pF inputs at 100 MHz burst rates. |
| Test Equipment Digital Pattern Generator | Memory-Mapped I/O Expansion Module |
|
Use Scenario: Generating precise, glitch-free stimulus patterns for IC functional testing using a pattern memory and sequencer. IC Role / Device Role / Timing Role: Buffers and registers pattern data from SRAM into a high-speed parallel output bus, with nSAB/nSBA selecting between live or stored vectors on-the-fly. Use Value: Sub-4 ns propagation delay and 320 MHz max clock support enable nanosecond-accurate vector timing; bus-hold prevents invalid states during pattern reload gaps. |
Use Scenario: Expanding GPIO count on a RISC-V SoC-based edge gateway by adding 32-bit peripheral registers accessible via AXI-Lite bus. IC Role / Device Role / Timing Role: Serves as a synchronous register interface between the SoC's APB bridge and external SPI/UART peripherals, capturing address/data on clock edges and presenting stable outputs. Use Value: Dual-register capability allows overlapping read-modify-write cycles without bus contention; TSSOP56 footprint fits compact carrier boards with thermal constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVCH16646GR | Same logic function and pinout; Texas Instruments version in 56-pin TSSOP but with wider VCC range (1.65 V–3.6 V) and higher ICC max (100 mA vs. 40 μA typical). | Supports 1.8 V domain interfacing; less suitable for ultra-low-quiescent-current battery-backed systems due to higher static current. | Select SN74ALVCH16646GR only if 1.65 V operation or TI ecosystem alignment is required; otherwise, 74ALVCH16646DGGS offers superior bus-hold strength and lower typical ICC. |
| 74LVC16646ADGG | Nexperia LVC variant; identical TSSOP56 package but lacks bus-hold and has lower drive (±24 mA only at VCC ≥ 3.0 V; drops to ±12 mA at 2.7 V). | Not suitable for systems with unterminated or long stub traces where floating inputs may cause oscillation; requires external pull-ups. | Choose 74ALVCH16646DGGS over 74LVC16646ADGG when bus-hold is mandatory or when operating below 3.0 V with full drive capability is needed. |
Compared with SN74ALVCH16646GR and 74LVC16646ADGG, the 74ALVCH16646DGGS uniquely combines robust bus-hold, guaranteed ±24 mA drive down to 2.3 V, and industrial temperature rating in a single optimized package-making it the preferred choice for noise-prone, mixed-voltage industrial interconnects where reliability trumps marginal cost savings.
Availability
74ALVCH16646DGGS is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, FPGA-to-MCU bridging, and memory-mapped I/O expansion requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for 74ALVCH16646DGGS 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74ALVCH16646DGGS belongs to Nexperia's ALVCH advanced low-voltage CMOS logic family, engineered specifically for noise-immune, register-enhanced bus interfacing in industrial control and test equipment where signal integrity and timing determinism are critical.
FAQ
What is the purpose of the nSAB and nSBA pins?
The nSAB (Select A-to-B) and nSBA (Select B-to-A) pins determine whether real-time or registered data appears at the transceiver outputs. When nSAB = HIGH, registered Port A data is routed to Port B; when LOW, live Port A data passes through. This enables dynamic selection between buffered and transparent modes without re-clocking, essential for protocol-aware data multiplexing in communication controllers.
How does bus-hold functionality affect system design?
Bus-hold actively maintains the last valid logic state on any floating data input (1A0–1A7, 1B0–1B7, etc.) using internal feedback circuitry, eliminating the need for external pull-up or pull-down resistors. This reduces component count, saves PCB area, and prevents undefined states during hot-swap or partial power-down events-particularly valuable in modular I/O chassis where connectors may be unpopulated.
Can 74ALVCH16646DGGS operate at 1.8 V?
No. The 74ALVCH16646DGGS is specified for 2.3 V to 3.6 V operation only. Attempting to power it at 1.8 V violates the recommended operating conditions and will result in unreliable output drive, increased propagation delay, and potential register corruption. For 1.8 V systems, consider the SN74ALVCH16646GR (1.65 V–3.6 V) or redesign with level-shifting circuitry.
Why are there eight GND pins and four VCC pins?
The eight GND and four VCC pins provide low-inductance, distributed power delivery to minimize ground bounce and supply noise during simultaneous switching of all 32 I/Os. This architecture meets JEDEC standards for high-speed logic and ensures stable operation in electrically noisy industrial environments-such as motor drive cabinets-where transient coupling could otherwise corrupt register contents or output states.
74ALVCH16646DGGS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74ALVCH
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 2.3V ~ 2.7V, 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
74ALVCH16646DGGS FAQ
1.How can I place an order for 74ALVCH16646DGGS through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ALVCH16646DGGS 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 74ALVCH16646DGGS reliable?
The price and inventory of 74ALVCH16646DGGS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ALVCH16646DGGS is usually 5 days.
3.What payment methods are accepted for 74ALVCH16646DGGS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ALVCH16646DGGS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ALVCH16646DGGS?
74ALVCH16646DGGS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ALVCH16646DGGS 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 74ALVCH16646DGGS?
For technical support, including 74ALVCH16646DGGS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ALVCH16646DGGS requirements.
6.How does Aetrix verify that 74ALVCH16646DGGS is sourced from the original manufacturer or authorized distributors?
All 74ALVCH16646DGGS 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 74ALVCH16646DGGS meets industry standards.
7.What is the process for return or replacement of 74ALVCH16646DGGS?
All 74ALVCH16646DGGS units undergo pre-shipment inspection (PSI). If there is an issue with 74ALVCH16646DGGS, 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 74ALVCH16646DGGS part is unused and in its original packaging.
Return procedure for 74ALVCH16646DGGS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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