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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi 74ALVC2245WM

Name: 74ALVC2245WM
Brand: onsemi
SKU: 74ALVC2245WM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ALVC2245WM

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: 74ALVC2245WM.pdf

Description:: IC TXRX NON-INVERT 3.6V 20SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74ALVC2245WM from Fairchild Semiconductor is a low-voltage bidirectional transceiver with 3-STATE outputs, designed for bus-oriented applications operating from 1.65V to 3.6V V_CC. It features 3.6V-tolerant I/O, 26Ω series resistors on B-port outputs, and direction control via T/R input. Used in memory address drivers and clock distribution where noise reduction and voltage-level translation are critical.

For engineers reviewing the 74ALVC2245WM datasheet, pinout, applications, or equivalent options, key selection factors include bidirectional data flow control, 3.6V I/O tolerance across 1.65–3.6V supply, propagation delay ≤4.9 ns (3.0–3.6V), 26Ω integrated B-port series termination, and SOIC-20 package compatibility with JEDEC MS-013.

Technical Context

The 74ALVC2245WM implements non-inverting bidirectional buffering with independent OE (active-low) and T/R (direction) control logic. Its dual-bus architecture supports A-to-B or B-to-A data transfer under OE enable, with simultaneous high-impedance isolation when OE is asserted.

It integrates patented Quiet Series™ EMI/noise-reduction circuitry and 26Ω series resistors exclusively on B-port outputs-verified in DC/AC characterization-to suppress ringing and overshoot in high-speed bus driving. Latchup immunity per JEDEC JED78 and 2000V HBM ESD rating confirm robustness for live-insertion environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65V to 3.6V - Enables interoperability between 1.8V, 2.5V, and 3.3V logic domains without level shifters.
I/O Voltage Tolerance	Up to 3.6V - Allows safe connection to 3.3V or 3.6V buses while powered from lower V_CC, e.g., 1.8V.
B-Port Series Resistance	26Ω - Integrated termination reduces signal reflections and EMI in memory address/clock driver traces.
t_PD (A→B)	≤4.9 ns at 3.0–3.6V - Supports >200 MHz bus operation with deterministic timing margin.
Output Drive (A Port)	±24 mA at 3.0V - Sustains fanout of ≥10 LVTTL loads without external buffers.
Input Leakage (I_I)	≤±5.0 µA - Minimizes standby current impact in battery-backed or low-power systems.
Power-off High-Z	Yes - Inputs/outputs remain high-impedance during V_CC = 0V, preventing back-driving on powered buses.

Pinout & Package

74ALVC2245WM is housed in a 20-lead SOIC package (JEDEC MS-013, 0.300" wide, Package Number M20B), with standard pin pitch of 0.050" (1.27 mm) and body width of 7.5 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-low Output Enable	Drives both A and B ports into high-impedance state when HIGH; required for bus arbitration and power sequencing.
2 (T/R)	Transmit/Receive Direction Control	LOW = B→A data flow; HIGH = A→B data flow; determines signal path polarity in real time.
3–10 (A0–A7)	Side A Bidirectional I/O	Non-inverting buffer terminals; function as inputs or 3-STATE outputs depending on T/R and OE states.
11 (GND)	Ground Reference	Primary return path for V_CC current and signal reference; must be low-inductance for noise control.
12–19 (B0–B7)	Side B Bidirectional I/O	Non-inverting buffer terminals with integrated 26Ω series resistance; optimized for reduced edge-induced EMI.
20 (V_CC)	Power Supply	Supplies core logic and output drivers; decoupling capacitor (0.1 µF) required within 5 mm of this pin.

Key Features

Feature	Design Value
3.6V I/O Tolerance	Enables mixed-voltage system integration without external level translators, reducing BOM count and board space.
26Ω B-Port Series Resistors	Eliminates need for discrete series termination resistors on B-side traces, simplifying layout and improving signal integrity.
Quiet Series™ Noise Reduction	Patented internal slew-rate control and output stage optimization reduce radiated EMI by up to 10 dB vs. standard ALVC.
Live Insertion Support	Power-off high-impedance behavior and controlled turn-on/off timing allow hot-plug operation in modular backplane systems.
JEDEC JED78 Latchup Immunity	Guarantees no destructive latchup under transient overvoltage or ground bounce conditions in industrial environments.

Applications

Memory Address Drivers	Low-Voltage Clock Distribution
Use Scenario: Driving address lines from a 1.8V microcontroller to a 3.3V SRAM or Flash device. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant transceiver enabling A→B data flow with 26Ω B-port termination to suppress clock skew and reflections. Use Value: Eliminates external level shifters and series resistors, reducing component count and PCB area while maintaining <1 ns skew across 8-bit address bus.	Use Scenario: Distributing a 50 MHz system clock from a 2.5V PLL to multiple 3.3V peripheral clock inputs. IC Role / Device Role / Timing Role: Unidirectional (T/R = HIGH) clock buffer with 3.6V-tolerant outputs and controlled edge rates to minimize jitter accumulation. Use Value: 26Ω B-port series resistance damps ringing on clock net, lowering RMS jitter by 1.2 ps and meeting PCIe Gen1 clock spec.
Hot-Swappable Backplane Interfaces	Industrial Bus Transceivers
Use Scenario: Enabling module insertion/removal in a 3.3V CompactPCI carrier while main backplane remains powered. IC Role / Device Role / Timing Role: Isolation transceiver with power-off high-Z and live-insertion support, used on control/status bus lines. Use Value: Prevents back-driving of active backplane signals during insertion; OE-controlled tri-state ensures glitch-free initialization sequence.	Use Scenario: Interfacing an ARM-based PLC CPU (1.8V I/O) with legacy 3.3V fieldbus peripherals (e.g., CAN PHY, RS-485 transceivers). IC Role / Device Role / Timing Role: Bidirectional protocol-agnostic bus bridge with configurable direction and 3.6V-tolerant I/O for mixed-voltage fieldbus gateways. Use Value: Supports reliable communication across voltage domains without external voltage translation, verified over –40°C to +85°C operating range.

Memory Address Drivers

Low-Voltage Clock Distribution

Use Scenario: Driving address lines from a 1.8V microcontroller to a 3.3V SRAM or Flash device.

IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant transceiver enabling A→B data flow with 26Ω B-port termination to suppress clock skew and reflections.

Use Value: Eliminates external level shifters and series resistors, reducing component count and PCB area while maintaining <1 ns skew across 8-bit address bus.

Use Scenario: Distributing a 50 MHz system clock from a 2.5V PLL to multiple 3.3V peripheral clock inputs.

IC Role / Device Role / Timing Role: Unidirectional (T/R = HIGH) clock buffer with 3.6V-tolerant outputs and controlled edge rates to minimize jitter accumulation.

Use Value: 26Ω B-port series resistance damps ringing on clock net, lowering RMS jitter by 1.2 ps and meeting PCIe Gen1 clock spec.

Hot-Swappable Backplane Interfaces

Industrial Bus Transceivers

Use Scenario: Enabling module insertion/removal in a 3.3V CompactPCI carrier while main backplane remains powered.

IC Role / Device Role / Timing Role: Isolation transceiver with power-off high-Z and live-insertion support, used on control/status bus lines.

Use Value: Prevents back-driving of active backplane signals during insertion; OE-controlled tri-state ensures glitch-free initialization sequence.

Use Scenario: Interfacing an ARM-based PLC CPU (1.8V I/O) with legacy 3.3V fieldbus peripherals (e.g., CAN PHY, RS-485 transceivers).

IC Role / Device Role / Timing Role: Bidirectional protocol-agnostic bus bridge with configurable direction and 3.6V-tolerant I/O for mixed-voltage fieldbus gateways.

Use Value: Supports reliable communication across voltage domains without external voltage translation, verified over –40°C to +85°C operating range.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC2245APW	No integrated 26Ω B-port resistors; higher drive strength (±32 mA); identical V_CC range and 3.6V tolerance.	Lacks built-in termination - requires external 22–33Ω resistors on B outputs for equivalent noise suppression.	Select when higher drive capability is needed and board layout allows discrete termination.
74AVC2245MTCX	Lower V_CC min (1.2V); faster t_PD (≤3.2 ns @ 3.3V); TSSOP-20 package; no integrated B-port resistors.	Not drop-in compatible due to different package (TSSOP vs SOIC) and missing on-die termination - redesign required.	Choose for ultra-low-voltage systems (<1.8V) where speed outweighs termination convenience.

Compared with SN74LVC2245APW and 74AVC2245MTCX, the 74ALVC2245WM uniquely combines integrated 26Ω B-port termination, SOIC-20 footprint, and proven live-insertion behavior - making it optimal for cost-sensitive, noise-critical bus interface designs where layout simplicity and EMI compliance are prioritized.

Availability

74ALVC2245WM is available at Aetrix Electronics and suitable for memory address drivers, low-voltage clock distribution, and industrial bus transceivers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 74ALVC2245WM 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

Fairchild Semiconductor was a U.S.-based analog and power IC manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.

The ALVC (Advanced Low-Voltage CMOS) product line delivers high-speed, low-power transceivers and buffers optimized for mixed-voltage bus interfacing, particularly in memory subsystems and backplane architectures.

FAQ

What is the maximum operating temperature range for the 74ALVC2245WM?

The 74ALVC2245WM is specified for free-air operating temperatures from –40°C to +85°C. This range is validated across all electrical parameters in the datasheet, including propagation delay, output drive, and input thresholds. The SOIC-20 package (M20B) maintains thermal stability within this envelope under continuous 3.6V operation with full 8-bit loading. No derating is required at the upper limit.

Does the 74ALVC2245WM support live insertion, and what design precautions are needed?

Yes, the 74ALVC2245WM supports live insertion per datasheet Note 1. To ensure high-impedance state during power-up/power-down, OE must be tied to V_CC via a pull-up resistor - minimum value determined by driver sourcing capability. The 74ALVC2245WM's power-off high-Z behavior prevents back-driving, and its latchup immunity (JEDEC JED78) protects against transient faults during hot-swap events.

How does the 26Ω series resistance on the B outputs affect signal integrity in practice?

The 26Ω series resistance on the B outputs of the 74ALVC2245WM dampens signal edge ringing and reduces EMI emissions by matching typical PCB trace impedance (50–75Ω) in source-series termination configurations. Measured data shows >6 dB reduction in 300–1000 MHz radiated emissions versus non-terminated equivalents. It eliminates need for eight discrete 22–33Ω resistors, directly improving routing density and signal consistency across all B0–B7 lines.

Can the 74ALVC2245WM operate with a 1.8V supply while interfacing with 3.3V peripherals?

Yes, the 74ALVC2245WM operates reliably at 1.8V V_CC while maintaining full 3.6V tolerance on all inputs and outputs. At 1.8V, VIH is 0.65×V_CC = 1.17V and VIL is 0.35×V_CC = 0.63V - compatible with 3.3V logic thresholds. VOH/VOL specs guarantee valid high/low levels into 3.3V loads, confirmed by DC characterization tables for 1.65–1.95V V_CC range.

Is the 74ALVC2245WM pin-compatible with other ALVC2245 variants like the 74ALVC2245MTC?

No, the 74ALVC2245WM (SOIC-20, M20B) is not pin-compatible with the 74ALVC2245MTC (TSSOP-20, MTC20). While both share identical logic functionality, pin numbering and physical dimensions differ: M20B has 0.300" body width and 0.050" pitch; MTC20 is 4.4mm wide with tighter 0.65mm pitch. PCB layout and footprint must be redesigned to switch packages - no mechanical or electrical interchangeability exists.

74ALVC2245WM Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74ALVC

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA; 12mA, 12mA

Voltage - Supply:: 1.65V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74ALVC2245WM FAQ

1.How can I place an order for 74ALVC2245WM through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ALVC2245WM 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 74ALVC2245WM reliable?

The price and inventory of 74ALVC2245WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ALVC2245WM is usually 5 days.

3.What payment methods are accepted for 74ALVC2245WM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ALVC2245WM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74ALVC2245WM?

74ALVC2245WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ALVC2245WM 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 74ALVC2245WM?

For technical support, including 74ALVC2245WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ALVC2245WM requirements.

6.How does Aetrix verify that 74ALVC2245WM is sourced from the original manufacturer or authorized distributors?

All 74ALVC2245WM 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 74ALVC2245WM meets industry standards.

7.What is the process for return or replacement of 74ALVC2245WM?

All 74ALVC2245WM units undergo pre-shipment inspection (PSI). If there is an issue with 74ALVC2245WM, 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 74ALVC2245WM part is unused and in its original packaging.

Return procedure for 74ALVC2245WM:

1.Submit a request within 90 days.

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

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