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Texas Instruments 74ALVCH16646DLG4
- Part No.:
- 74ALVCH16646DLG4
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ALVCH16646DLG4.pdf
- Description:
- IC BUS TRANSCVR 16BIT 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:340
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Product details
Overview
74ALVCH16646DLG4 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 storage on both buses, features bus-hold inputs to eliminate external pull resistors, and delivers 150 MHz clock frequency capability in 56-pin SSOP (DL) package.
For engineers reviewing the 74ALVCH16646DLG4 datasheet, 74ALVCH16646DLG4 pinout, 74ALVCH16646DLG4 application, or 74ALVCH16646DLG4 equivalent, this device serves as a voltage-scalable, registered transceiver for memory interface buffering, FPGA I/O expansion, and multi-bus arbitration where real-time and stored data multiplexing is required.
Technical Context
The 74ALVCH16646DLG4 implements dual independent 8-bit transceiver channels with separate DIR, OE, CLKAB/CLKBA, and SAB/SBA controls - enabling simultaneous or selective real-time transfer, stored-data forwarding, or isolation modes. Its EPIC™ submicron CMOS process ensures latch-up immunity (>250 mA) and robust ESD protection (>2 kV HBM).
Each channel supports transparent or registered operation: data at A or B ports is latched on the low-to-high transition of CLKAB or CLKBA, while SAB/SBA selects between live input or registered value at output - eliminating decoding glitches during mode transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables interoperability across 1.8 V, 2.5 V, and 3.3 V logic domains without level shifters. |
| Max Clock Frequency | 150 MHz - supports high-speed synchronous bus handshaking in memory-mapped peripherals and FPGA interconnects. |
| Output Drive | ±24 mA at 3.0 V - sufficient to drive 50 Ω transmission lines or fan-out to ≥10 LVTTL loads under worst-case conditions. |
| Bus-Hold Current | ±75 µA at 3.0 V - actively holds floating inputs at valid logic levels, removing need for external biasing components. |
| Propagation Delay | 4.5 ns typical (VCC = 3.3 V) - ensures timing closure in sub-5 ns critical paths for high-performance digital subsystems. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control, communications infrastructure, and automotive body electronics. |
| Power Dissipation Cap | 43 pF (outputs enabled, VCC = 3.3 V) - enables accurate dynamic power estimation in clocked register applications. |
Pinout & Package
74ALVCH16646DLG4 is housed in a 56-pin Shrink Small-Outline Package (SSOP, DL), 300-mil width, 1.2 mm max height, JEDEC MO-194 compliant, with 0.5 mm lead pitch and exposed metal thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control (per 8-bit bank) | Determines data flow direction: low = B→A, high = A→B; independent per bank for asymmetric bus management. |
| 1OE, 2OE | Output enable (per 8-bit bank) | Active-low; places associated A/B port outputs in high-impedance state - essential for bus sharing and hot-swap isolation. |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Clock inputs (per bank and direction) | Low-to-high edge triggers registration of A or B bus data into internal registers - enables synchronous capture and deterministic timing. |
| 1SAB, 2SAB, 1SBA, 2SBA | Select control (per bank and direction) | Chooses between real-time or registered data at output - eliminates glitch during mode switching via internal synchronized mux logic. |
| A1–A8, B1–B8 (x2 banks) | Bidirectional I/O ports | True 16-bit dual-port interface: each pin functions as input or output depending on DIR/OE state - no dedicated input-only or output-only pins. |
| VCC, GND (x8 total) | Power and ground terminals | Distributed supply/ground pins minimize switching noise and improve signal integrity across full 16-bit width. |
Key Features
| Feature | Design Value |
|---|---|
| Widebus™ architecture | Optimized 16-bit layout with interleaved I/O and distributed power pins reduces crosstalk and improves timing margin in parallel bus designs. |
| Bus-hold circuitry | Eliminates external pull-up/pull-down resistors on all data inputs - reduces BOM count, PCB area, and assembly cost in high-pin-count interfaces. |
| Glitch-free select multiplexing | Internal synchronization of SAB/SBA control prevents metastability and output glitches when toggling between real-time and stored data paths. |
| EPIC™ submicron CMOS | Delivers 150 MHz operation with <4.5 ns propagation delay and <7 ns enable/disable times - meets timing requirements for DDR2/DDR3 auxiliary control buses. |
| Industrial temperature range | Guaranteed functionality from –40°C to +85°C - suitable for deployment in uncontrolled environments such as factory automation controllers and outdoor telecom equipment. |
Applications
| Memory Interface Buffering | FPGA I/O Expansion |
|---|---|
|
Use Scenario: Isolating and synchronizing data between a microcontroller's external memory bus and a slower SRAM or flash device. IC Role / Device Role / Timing Role: Acts as a registered transceiver that captures address/data on clock edges and forwards stable values to memory - decoupling timing domains. Use Value: Enables reliable interfacing to memory parts with setup/hold timing stricter than the controller's native bus timing, using clocked registration to meet tSU/tH requirements. |
Use Scenario: Extending the I/O count of an FPGA by connecting additional peripheral devices (e.g., ADCs, DACs, sensors) via a shared parallel bus. IC Role / Device Role / Timing Role: Provides bidirectional, direction-controlled data path between FPGA GPIO banks and peripheral modules - managed via FPGA-configured DIR/OE signals. Use Value: Allows single FPGA pin bank to serve multiple peripherals through time-multiplexed access, reducing FPGA resource usage and simplifying PCB routing. |
| Multi-Processor Bus Arbitration | Legacy Peripheral Interfacing |
|
Use Scenario: Enabling controlled data exchange between two microcontrollers sharing a common data bus, with priority-based access and data staging. IC Role / Device Role / Timing Role: Functions as a dual-register transceiver where each MCU stores its data independently, then forwards it on demand - preventing bus contention. Use Value: Eliminates need for external arbitration logic or software handshake protocols; hardware-enforced isolation ensures deterministic, glitch-free inter-processor communication. |
Use Scenario: Connecting modern low-voltage SoCs to legacy 5 V tolerant peripherals (e.g., industrial UARTs, display controllers) via level-adapted parallel interface. IC Role / Device Role / Timing Role: Serves as a voltage-scalable buffer with bus-hold inputs - accepts 1.8 V/2.5 V/3.3 V logic levels while driving compatible loads without external level shifters. Use Value: Simplifies migration from older 5 V systems by maintaining compatibility with existing peripheral timing and voltage thresholds across mixed-supply designs. |
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 |
|---|---|---|---|
| SN74ALVCH16646DGGR | Same die, TSSOP-56 (DGG) package; 0.5 mm pitch, 6.2 mm × 13.9 mm footprint vs. DL's 7.4 mm × 15.0 mm. | Better suited for automated SMT assembly with tape-and-reel (2000 pcs/reel); higher density but requires tighter stencil design. | Choose DGGR for volume production with pick-and-place optimization; DL remains preferred for prototyping or tube-based manual assembly. |
| SN74ALVCH16646DGVR | Same die, TVSOP-56 (DGV) package; 1.2 mm max height, 4.4 mm × 11.7 mm footprint - smallest board area among variants. | Optimized for space-constrained portable or modular designs; lower thermal mass may require derating above 85°C ambient. | Select DGVR when PCB real estate is critical and thermal profile allows; verify reflow profile compatibility due to thinner package construction. |
Compared with SN74ALVCH16646DGGR and SN74ALVCH16646DGVR, the 74ALVCH16646DLG4 offers the largest pad pitch (0.5 mm) and most relaxed soldering tolerances - making it ideal for low-volume manufacturing, repair, and validation where assembly yield and test accessibility outweigh miniaturization goals.
Availability
74ALVCH16646DLG4 is available at Aetrix Electronics and suitable for industrial control systems, FPGA-based instrumentation, memory subsystems, and legacy interface bridging requiring stable component supply across extended product lifecycles.
Supply support for 74ALVCH16646DLG4 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-reliability interface ICs and widebus architectures.
The 74ALVCH16646DLG4 belongs to TI's Widebus™ family - engineered specifically for high-speed, low-voltage parallel bus management in industrial, computing, and communications equipment where signal integrity and timing determinism are critical.
FAQ
What is the recommended power-up sequence for the 74ALVCH16646DLG4?
TI specifies that OE should be tied to VCC through a pullup resistor during power-up to ensure outputs remain in high-impedance state until system initialization completes. For 74ALVCH16646DLG4, a minimum 10 kΩ resistor is sufficient given its ±5 µA input leakage; VCC must stabilize before applying clocks or data to prevent metastability in register stages.
Does the 74ALVCH16646DLG4 support hot-swap operation?
The 74ALVCH16646DLG4 supports partial hot-swap capability: its I/O ports tolerate input voltages up to VCC + 0.5 V, and bus-hold circuitry maintains valid logic states on floating inputs. However, full hot-swap requires external current limiting on VCC/GND lines, as the device lacks built-in hot-swap controllers or slew-rate limiting on I/Os.
Can the 74ALVCH16646DLG4 operate at 1.65 V with guaranteed timing performance?
Yes - the 74ALVCH16646DLG4 is fully characterized down to 1.65 V, including timing parameters like tpd (5.6 ns max), tsu (1.7 ns min), and th (0.6 ns min) at VCC = 1.65 V. All electrical specs in the datasheet SCES032F apply across the full 1.65 V–3.6 V range, with no derating required.
How does bus-hold functionality interact with externally pulled inputs on the 74ALVCH16646DLG4?
Bus-hold on the 74ALVCH16646DLG4 activates only when an input is floating; if an external resistor pulls the pin strongly (e.g., <1 kΩ to VCC/GND), the bus-hold circuit is overridden. At 1.65 V, bus-hold strength is ±25 µA - sufficient to hold against typical PCB leakage but not against active drivers or stiff pull resistors.
Is the 74ALVCH16646DLG4 RoHS compliant and lead-free?
Yes - the 74ALVCH16646DLG4 carries NIPDAU (nickel-palladium-gold) lead finish and is RoHS compliant per TI's packaging addendum. It meets JEDEC MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and supports peak reflow temperatures up to 260°C, consistent with standard lead-free soldering profiles.
74ALVCH16646DLG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- -
- 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-SSOP
74ALVCH16646DLG4 FAQ
1.How can I place an order for 74ALVCH16646DLG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ALVCH16646DLG4 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 74ALVCH16646DLG4 reliable?
The price and inventory of 74ALVCH16646DLG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ALVCH16646DLG4 is usually 5 days.
3.What payment methods are accepted for 74ALVCH16646DLG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ALVCH16646DLG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ALVCH16646DLG4?
74ALVCH16646DLG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ALVCH16646DLG4 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 74ALVCH16646DLG4?
For technical support, including 74ALVCH16646DLG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ALVCH16646DLG4 requirements.
6.How does Aetrix verify that 74ALVCH16646DLG4 is sourced from the original manufacturer or authorized distributors?
All 74ALVCH16646DLG4 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 74ALVCH16646DLG4 meets industry standards.
7.What is the process for return or replacement of 74ALVCH16646DLG4?
All 74ALVCH16646DLG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74ALVCH16646DLG4, 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 74ALVCH16646DLG4 part is unused and in its original packaging.
Return procedure for 74ALVCH16646DLG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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