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Texas Instruments SN74ALVCH16646

Name: SN74ALVCH16646
Brand: Texas Instruments
SKU: SN74ALVCH16646
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ALVCH16646

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN74ALVCH16646.pdf

Description:: IC BUS TRANSCVR 16BIT 56SSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN74ALVCH16646 from Texas Instruments is a 16-bit bus transceiver and register with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It supports dual 8-bit or single 16-bit bidirectional data transfer between A and B buses, features independent clocking (CLKAB/CLKBA), direction control (DIR), output enable (OE), and select control (SAB/SBA) for real-time or stored-data routing. It operates across –40°C to 85°C and integrates bus-hold circuitry to eliminate external pullup/pulldown resistors - used in high-density memory interface and backplane buffer applications.

For engineers reviewing the SN74ALVCH16646 datasheet, SN74ALVCH16646 pinout, SN74ALVCH16646 application, or SN74ALVCH16646 equivalent, key selection criteria include its dual-clock register architecture, 3.6-V absolute maximum supply rating, bus-hold input retention, 150-MHz clock frequency capability, and support for DL/DGG/DGV packages - all critical for voltage-scalable, glitch-free bus management in industrial and telecom systems.

Technical Context

The SN74ALVCH16646 implements two independent 8-bit register-transceiver blocks, each with separate CLKAB/CLKBA, DIR, OE, SAB/SBA, and bus-hold inputs. Data latching occurs on low-to-high clock transitions, and select control enables seamless multiplexing between real-time and registered data without decoding glitches.

Its EPIC™ submicron CMOS process delivers ESD protection >2000 V (MIL-STD-883), latch-up immunity >250 mA (JESD 17), and rail-to-rail I/O voltage tolerance (–0.5 V to V_CC + 0.5 V). The device maintains functional integrity during power sequencing via OE pullup recommendation and retains valid logic states on floating inputs via active bus-hold circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 3.6 V - enables interoperability across 1.8-V, 2.5-V, and 3.3-V system domains without level shifters.
Operating Temperature	–40°C to 85°C - qualified for industrial-grade embedded and communications equipment.
Max Clock Frequency	150 MHz - supports high-speed synchronous bus arbitration and data capture in backplane interfaces.
Bus-Hold Current	±45 µA at 2.3 V - actively holds unused inputs at valid logic levels, eliminating external biasing components.
Output Drive	±24 mA at 3.0 V - drives standard TTL loads and moderate-capacitance PCB traces without buffering.
Propagation Delay	4.5 ns typical at 3.3 V - ensures tight timing margins in multi-stage register pipelines.
I/O Capacitance	8.5 pF per port - minimizes signal distortion and crosstalk in dense parallel bus layouts.

Pinout & Package

SN74ALVCH16646 is available in 56-pin plastic packages: Shrink Small-Outline (DL), Thin Shrink Small-Outline (DGG), and Thin Very Small-Outline (DGV). All variants share identical pinout and thermal characteristics (θ_JA = 74–86°C/W).

Pin/Terminal	Circuit Role	Design Meaning
1DIR, 2DIR	Direction Control Input	Determines data flow direction (A→B or B→A) when OE is low; controls which bus receives registered or real-time data.
1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA	Register Clock Input	Latches data from A bus (on CLKAB↑) or B bus (on CLKBA↑); enables independent timing for each 8-bit channel.
1SAB, 2SAB, 1SBA, 2SBA	Select Control Input	Chooses between real-time (transparent) or stored data output; eliminates multiplexer switching glitches during mode transitions.
1OE, 2OE	Output Enable Input	Active-low control of 3-state outputs; high-OE forces isolation while preserving internal register state and input functionality.
A1–A8, B1–B8 (×2)	Bidirectional Data Port	16 total I/O pins split into two 8-bit buses; each supports simultaneous input sampling and output driving under proper DIR/OE control.
V_CC, GND (×8)	Power Distribution	Multiple V_CC/GND pairs reduce switching noise and improve signal integrity across high-speed parallel paths.

Key Features

Feature	Design Value
Dual 8-bit register-transceiver architecture	Enables independent clocking, direction control, and data storage for two bus segments - ideal for asymmetric memory-mapped I/O partitioning.
Bus-hold circuitry on all data inputs	Eliminates need for external pullup/pulldown resistors, reducing BOM count and board area in high-pin-count designs.
Glitch-free select control (SAB/SBA)	Prevents transient invalid states during transitions between real-time and registered data modes - critical for deterministic bus arbitration.
3.6-V absolute maximum supply rating	Allows safe operation with 3.3-V supplies and tolerance to transient overvoltage events in noisy industrial environments.
EPIC™ submicron CMOS process	Delivers high-speed performance with low static current (40 µA typical ICC) and robust latch-up immunity (>250 mA).

Applications

Memory Interface Buffering	Backplane Data Routing
Use Scenario: Interfacing a 16-bit microprocessor data bus to multiple SRAM or Flash devices with staggered access timing. IC Role / Device Role / Timing Role: Acts as a registered transceiver to decouple processor timing from memory latency; clocks data into registers on CLKAB/CLKBA edges and routes via DIR/OE/SAB control. Use Value: Enables pipelined read/write cycles with deterministic setup/hold timing (tsu = 1.4 ns min at 3.3 V), improving effective memory bandwidth by up to 30% versus non-registered buffers.	Use Scenario: Managing bidirectional data flow between line cards and a central switch fabric in modular telecom chassis. IC Role / Device Role / Timing Role: Provides isolated, registered bus extension between hot-swappable modules; uses OE high for safe insertion/removal and stores bus state during reconfiguration. Use Value: Maintains data coherency across module swaps via retained register contents and prevents bus contention using 3-state outputs with <1.6 ns disable time (tdis).
Industrial PLC I/O Expansion	FPGA-to-ASIC Parallel Bridge
Use Scenario: Extending FPGA-controlled I/O lines to remote sensor/actuator banks over 10+ cm PCB traces. IC Role / Device Role / Timing Role: Buffers and registers parallel control signals (e.g., address/data strobes) with bus-hold retention on unterminated stubs. Use Value: Eliminates signal degradation from unterminated lines using ±45 µA bus-hold current, enabling reliable operation at 150 MHz without termination resistors.	Use Scenario: Synchronizing asynchronous data transfers between a high-speed FPGA fabric and legacy ASIC peripherals. IC Role / Device Role / Timing Role: Serves as a clock-domain crossing bridge: captures FPGA-side data on CLKAB, holds it, then forwards to ASIC on CLKBA with controlled DIR/OE timing. Use Value: Resolves metastability risk via registered handshaking and provides glitch-free mode switching (SAB/SBA) for dynamic protocol adaptation.

Memory Interface Buffering

Backplane Data Routing

Use Scenario: Interfacing a 16-bit microprocessor data bus to multiple SRAM or Flash devices with staggered access timing.

IC Role / Device Role / Timing Role: Acts as a registered transceiver to decouple processor timing from memory latency; clocks data into registers on CLKAB/CLKBA edges and routes via DIR/OE/SAB control.

Use Value: Enables pipelined read/write cycles with deterministic setup/hold timing (tsu = 1.4 ns min at 3.3 V), improving effective memory bandwidth by up to 30% versus non-registered buffers.

Use Scenario: Managing bidirectional data flow between line cards and a central switch fabric in modular telecom chassis.

IC Role / Device Role / Timing Role: Provides isolated, registered bus extension between hot-swappable modules; uses OE high for safe insertion/removal and stores bus state during reconfiguration.

Use Value: Maintains data coherency across module swaps via retained register contents and prevents bus contention using 3-state outputs with <1.6 ns disable time (tdis).

Industrial PLC I/O Expansion

FPGA-to-ASIC Parallel Bridge

Use Scenario: Extending FPGA-controlled I/O lines to remote sensor/actuator banks over 10+ cm PCB traces.

IC Role / Device Role / Timing Role: Buffers and registers parallel control signals (e.g., address/data strobes) with bus-hold retention on unterminated stubs.

Use Value: Eliminates signal degradation from unterminated lines using ±45 µA bus-hold current, enabling reliable operation at 150 MHz without termination resistors.

Use Scenario: Synchronizing asynchronous data transfers between a high-speed FPGA fabric and legacy ASIC peripherals.

IC Role / Device Role / Timing Role: Serves as a clock-domain crossing bridge: captures FPGA-side data on CLKAB, holds it, then forwards to ASIC on CLKBA with controlled DIR/OE timing.

Use Value: Resolves metastability risk via registered handshaking and provides glitch-free mode switching (SAB/SBA) for dynamic protocol adaptation.

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
SN74ALVCH162245	Non-registering 16-bit transceiver; no CLKAB/CLKBA, SAB/SBA, or storage capability - only real-time bidirectional transfer.	Suitable for simple level-shifting or bus isolation where timing registration is unnecessary.	Choose SN74ALVCH162245 only if pipeline staging, data retention, or glitch-free multiplexing is not required.
SN74LVC16646	Same pinout and function but LVC family: lower drive (±24 mA @ 3.3 V vs. ±32 mA for LVC), higher ICC (100 µA vs. 40 µA), and no bus-hold - requires external biasing.	Used where cost sensitivity outweighs bus-hold convenience and leakage budget allows higher ICC.	SN74LVC16646 offers pin compatibility but lacks bus-hold and has higher static power - verify input biasing and thermal design.

Compared with SN74ALVCH162245, the SN74ALVCH16646 adds critical register functionality for pipelining and state retention; compared with SN74LVC16646, it delivers superior bus-hold integration and lower quiescent current - making it optimal for unbuffered, low-power, high-reliability industrial interfaces.

Availability

SN74ALVCH16646 is available at Aetrix Electronics and suitable for memory interface buffering, backplane data routing, industrial PLC I/O expansion, and FPGA-to-ASIC parallel bridging requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74ALVCH16646 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.

The SN74ALVCH16646 belongs to TI's Widebus™ family of advanced bus-interface devices, engineered specifically for high-speed, low-voltage, register-enhanced data transfer in industrial, telecom, and computing infrastructure.

FAQ

What is the primary function of the SN74ALVCH16646?

The SN74ALVCH16646 is a 16-bit bus transceiver and register with 3-state outputs. It performs bidirectional data transfer between two 8-bit or one 16-bit bus while providing clocked storage, direction control, output enable, and select control for real-time or registered data routing - all within a single 56-pin package.

Does the SN74ALVCH16646 require external pullup or pulldown resistors?

No. The SN74ALVCH16646 integrates active bus-hold circuitry on all data inputs, which maintains unused or floating inputs at valid logic levels without external components. This feature reduces BOM cost and PCB area, especially in high-density parallel bus implementations.

What are the supported supply voltage and operating temperature ranges for the SN74ALVCH16646?

The SN74ALVCH16646 operates from 1.65 V to 3.6 V V_CC and is characterized for –40°C to 85°C free-air temperature. Its EPIC™ process ensures stable timing and logic behavior across this full industrial range, with verified 150-MHz clock capability at 3.3 V.

How does the SN74ALVCH16646 prevent glitches during data mode switching?

The SN74ALVCH16646 uses dedicated select-control inputs (SAB/SBA) with internal circuitry that eliminates decoding glitches during transitions between real-time (transparent) and stored-data modes - a key differentiator versus discrete multiplexer + register solutions where timing skew causes transient invalid states.

Which packages are available for the SN74ALVCH16646?

The SN74ALVCH16646 is offered in three 56-pin surface-mount packages: Plastic 300-mil Shrink Small-Outline (DL), Thin Shrink Small-Outline (DGG), and Thin Very Small-Outline (DGV). All share identical pinout, electrical specifications, and thermal resistance values (θ_JA = 74–86°C/W).

SN74ALVCH16646 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SN74ALVCH16646 FAQ

1.How can I place an order for SN74ALVCH16646 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ALVCH16646 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 SN74ALVCH16646 reliable?

The price and inventory of SN74ALVCH16646 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH16646 is usually 5 days.

3.What payment methods are accepted for SN74ALVCH16646?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCH16646 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ALVCH16646?

SN74ALVCH16646 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ALVCH16646 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 SN74ALVCH16646?

For technical support, including SN74ALVCH16646 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH16646 requirements.

6.How does Aetrix verify that SN74ALVCH16646 is sourced from the original manufacturer or authorized distributors?

All SN74ALVCH16646 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 SN74ALVCH16646 meets industry standards.

7.What is the process for return or replacement of SN74ALVCH16646?

All SN74ALVCH16646 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH16646, 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 SN74ALVCH16646 part is unused and in its original packaging.

Return procedure for SN74ALVCH16646:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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