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Texas Instruments 74ALVCH16646DGGRG4
- Part No.:
- 74ALVCH16646DGGRG4
- Manufacturer:
- Texas Instruments
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74ALVCH16646DGGRG4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
74ALVCH16646DGGRG4 from Texas Instruments is a 16-bit bus transceiver and register with 3-state outputs, designed for bidirectional data flow control between two 8-bit buses (A and B) in low-voltage systems. It operates from 1.65 V to 3.6 V, supports clocked register storage on CLKAB/CLKBA rising edges, and features bus-hold circuitry eliminating external pullup/pulldown resistors - used in high-density memory interface and FPGA I/O expansion applications.
For engineers reviewing the 74ALVCH16646DGGRG4 datasheet, 74ALVCH16646DGGRG4 pinout, 74ALVCH16646DGGRG4 application, or 74ALVCH16646DGGRG4 equivalent, key selection criteria include its dual 8-bit register-controlled transceiver architecture, 56-pin TSSOP (DGG) package, -40°C to +85°C industrial temperature range, and support for real-time or stored-data transfer via SAB/SBA select controls.
Technical Context
The 74ALVCH16646DGGRG4 implements two independent 8-bit register-transceiver channels sharing common control logic (OE, DIR, SAB/SBA, CLKAB/CLKBA), enabling flexible bus management including isolation, real-time transfer, and stored-data multiplexing. Its EPIC™ submicron CMOS process ensures latch-up immunity (>250 mA per JESD 17) and ESD robustness (>2 kV HBM, >200 V MM).
Bus-hold inputs maintain valid logic states on floating A/B data lines without external biasing, while output-enable and direction-control inputs coordinate bidirectional drive timing. The device supports simultaneous storage of A- and B-bus data on separate clock edges, and eliminates multiplexer glitch during transitions between transparent and registered modes via dedicated select-control circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables interoperability across mixed-voltage 1.8 V, 2.5 V, and 3.3 V logic domains. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded systems and communications equipment. |
| Max Clock Frequency | 150 MHz - supports high-speed synchronous bus handshaking in memory controllers and FPGA interconnects. |
| Output Drive Strength | ±24 mA at 3.0 V - sufficient to drive 50 Ω transmission lines or multiple CMOS loads without buffering. |
| Propagation Delay | 4.5 ns typical (VCC = 3.3 V) - ensures tight timing margins in high-speed parallel interfaces. |
| Power Dissipation Capacitance | 39 pF (outputs enabled, CL = 50 pF, f = 10 MHz) - quantifies dynamic power consumption in active data transfer mode. |
| Bus-Hold Current | ±75 µA at 3.0 V - actively sustains input logic state without external resistors, reducing BOM count and board space. |
Pinout & Package
TSSOP-56 (DGG) package: 12.0 mm × 4.4 mm × 1.2 mm body, 0.5 mm pitch, lead-free NiPdAu finish, MSL Level-1 (260°C reflow unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input | Determines data flow direction (A→B or B→A) when OE is low; dual independent controls enable asymmetric bus arbitration. |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Clock input | Rising-edge-triggered register clocks - stores A-port data on CLKAB↑, B-port data on CLKBA↑; supports independent or simultaneous capture. |
| 1SAB, 2SAB, 1SBA, 2SBA | Select control input | Chooses between real-time (transparent) or registered data path for each channel; eliminates glitch during mode switching. |
| 1OE, 2OE | Output-enable input | Active-low enables 3-state outputs; tied to VCC via pullup resistor ensures high-Z during power-up/down sequences. |
| A1–A8, B1–B8 | Data I/O port | Two 8-bit bidirectional data buses - each pin functions as input or output depending on DIR/OE state; includes bus-hold on all inputs. |
| VCC, GND | Supply terminals | Single 1.65–3.6 V supply with distributed decoupling required; 10 VCC/GND pairs minimize ground bounce and supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| Widebus™ architecture | Enables scalable 16-bit data paths with consistent timing and signal integrity across TI's ALVC/ALVCH families. |
| EPIC™ submicron CMOS process | Delivers 150 MHz operation with <4.5 ns propagation delay and <10 µA ICC quiescent current at 3.3 V. |
| Integrated bus-hold circuitry | Eliminates need for 16 external pullup/pulldown resistors - reduces PCB area, assembly cost, and signal integrity risk. |
| Glitch-free select control | Hardware-multiplexed path switching between real-time and registered data avoids metastability or transient glitches. |
| Industrial temperature rating | Guaranteed functionality from -40°C to +85°C - suitable for base station radios, industrial PLCs, and automotive infotainment gateways. |
Applications
| Memory Interface Expansion | FPGA I/O Bridging |
|---|---|
Use Scenario: Expanding limited FPGA I/O banks to connect multiple SRAM or Flash devices with shared address/data buses. IC Role / Device Role / Timing Role: Acts as registered bidirectional bus transceiver - isolates FPGA core from memory timing skew while latching addresses and data on clock edges. Use Value: Enables deterministic setup/hold timing for asynchronous memory access, reduces FPGA pin count pressure, and supports hot-swap-capable memory modules. |
Use Scenario: Interfacing heterogeneous logic domains (e.g., 1.8 V FPGA core to 3.3 V peripheral ASIC) with synchronized data transfer. IC Role / Device Role / Timing Role: Provides voltage-level translation and clock-domain crossing via dual-register staging - buffers data across asynchronous clocks using CLKAB/CLKBA. Use Value: Eliminates external level shifters and FIFOs; simplifies PCB routing with single-chip bidirectional bridging and glitch-free mode switching. |
| Industrial Backplane Bus | Test Equipment Data Acquisition |
Use Scenario: Managing multi-drop communication on a 16-bit parallel backplane connecting PLC modules and sensor nodes. IC Role / Device Role / Timing Role: Functions as isolated bus repeater - stores and forwards commands/responses between master and slave slots using DIR/OE sequencing. Use Value: Prevents bus contention during hot insertion/removal; maintains signal integrity over 15+ cm traces via controlled drive strength and low Cio (8.5 pF). |
Use Scenario: Capturing parallel digital waveforms from DUTs into high-speed digitizers with precise timestamp alignment. IC Role / Device Role / Timing Role: Serves as clocked acquisition buffer - samples DUT outputs on CLKAB↑, holds data stable for digitizer readout via SAB-controlled output gating. Use Value: Achieves sub-nanosecond jitter-free sampling window; bus-hold preserves last valid state during idle periods, improving test repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVCH16646DGVR | Identical logic function and pinout, but in TVSOP-56 (DGV) package - 4.4 mm × 3.6 mm, 0.4 mm pitch, 1.2 mm max height. | Better suited for ultra-dense layouts where footprint area is constrained; thermal resistance higher (θJA = 86°C/W vs. 81°C/W). | Choose DGVR for space-constrained designs requiring same electrical behavior; verify PCB stencil design for finer pitch. |
| SN74ALVCH162245DGGR | 16-bit non-registering transceiver - no CLKAB/CLKBA, SAB/SBA, or storage capability; only DIR/OE control. | Applicable only in transparent (non-latched) bus extension scenarios - lacks clocked data capture and multiplexed output selection. | Select ALVCH162245 when real-time pass-through suffices and register functionality is unnecessary; saves control logic complexity. |
Compared with SN74ALVCH16646DGVR, the 74ALVCH16646DGGRG4 offers lower thermal resistance and broader PCB assembly compatibility; compared with SN74ALVCH162245DGGR, it adds critical clocked storage and glitch-free multiplexing - essential for synchronous system integration.
Availability
74ALVCH16646DGGRG4 is available at Aetrix Electronics and suitable for industrial automation, FPGA-based prototyping, and high-reliability memory subsystems requiring stable component supply across extended product lifecycles.
Supply support for 74ALVCH16646DGGRG4 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 expertise in high-performance bus interface ICs.
The ALVCH family delivers advanced low-voltage, high-speed logic for next-generation computing and communications infrastructure - optimized for signal integrity, power efficiency, and industrial reliability.
FAQ
What is the recommended power-up sequence for 74ALVCH16646DGGRG4?
TI recommends tying OE pins to VCC through a pullup resistor (value determined by driver sink capability) to ensure outputs remain in high-impedance state during power ramp. VCC must stabilize before applying input signals. The 74ALVCH16646DGGRG4 has no internal power-on reset, so external sequencing of control inputs is required for deterministic initialization.
Does 74ALVCH16646DGGRG4 support mixed-voltage operation between A and B buses?
No - the 74ALVCH16646DGGRG4 uses a single VCC supply (1.65 V to 3.6 V) for both A and B I/O ports. All inputs and outputs are referenced to this common supply; it does not provide level-shifting functionality. For mixed-voltage interfacing, external translators or the SN74ALVCH162245DGGR variant with independent VCCA/VCCB is required.
How does bus-hold circuitry affect signal integrity on unused 74ALVCH16646DGGRG4 inputs?
Bus-hold circuitry actively maintains the last-valid logic state on floating A/B inputs using weak feedback transistors (±75 µA hold current at 3 V). This prevents oscillation and EMI from unterminated stubs, eliminates need for external resistors, and improves noise immunity - verified across -40°C to +85°C operation in the 74ALVCH16646DGGRG4 datasheet.
Can 74ALVCH16646DGGRG4 operate reliably at 1.65 V VCC with full 150 MHz clock rate?
No - the 150 MHz maximum clock frequency is specified at VCC ≥ 2.3 V. At 1.65 V, timing parameters degrade: tpd increases to 5.6 ns (vs. 4.5 ns at 3.3 V), and minimum pulse width (tw) remains 3.3 ns. Full-speed operation requires VCC ≥ 2.3 V per TI's SCES032F timing tables for the 74ALVCH16646DGGRG4.
What is the meaning of the 'G4' suffix in 74ALVCH16646DGGRG4?
The 'G4' suffix denotes TI's green packaging standard: lead-free (Pb-free), RoHS-compliant, NiPdAu terminal finish, and halogen-free mold compound. It matches the environmental specifications of SN74ALVCH16646DGGR but with updated material content - the 74ALVCH16646DGGRG4 is fully compatible in form, fit, and function with legacy DGGR variants.
74ALVCH16646DGGRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 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
74ALVCH16646DGGRG4 FAQ
1.How can I place an order for 74ALVCH16646DGGRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ALVCH16646DGGRG4 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 74ALVCH16646DGGRG4 reliable?
The price and inventory of 74ALVCH16646DGGRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ALVCH16646DGGRG4 is usually 5 days.
3.What payment methods are accepted for 74ALVCH16646DGGRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ALVCH16646DGGRG4 transactions.
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4.How is shipping managed for 74ALVCH16646DGGRG4?
74ALVCH16646DGGRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ALVCH16646DGGRG4 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 74ALVCH16646DGGRG4?
For technical support, including 74ALVCH16646DGGRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ALVCH16646DGGRG4 requirements.
6.How does Aetrix verify that 74ALVCH16646DGGRG4 is sourced from the original manufacturer or authorized distributors?
All 74ALVCH16646DGGRG4 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 74ALVCH16646DGGRG4 meets industry standards.
7.What is the process for return or replacement of 74ALVCH16646DGGRG4?
All 74ALVCH16646DGGRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74ALVCH16646DGGRG4, 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 74ALVCH16646DGGRG4 part is unused and in its original packaging.
Return procedure for 74ALVCH16646DGGRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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