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

onsemi 74VCX2245WMX

Name: 74VCX2245WMX
Brand: onsemi
SKU: 74VCX2245WMX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VCX2245WMX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74VCX2245WMX.pdf

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

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Product details

Overview

74VCX2245WMX from Fairchild Semiconductor is a low-voltage bidirectional transceiver IC with 3.6V-tolerant I/O, 1.4V–3.6V V_CC operation, and integrated 26Ω series resistors on B-port outputs. It features dual 8-bit non-inverting buffers with 3-STATE control, direction managed by T/R input and output enable via active-low OE, and is used in memory address drivers, clock distribution, and bus interface applications.

For engineers reviewing the 74VCX2245WMX datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, SOIC-20 package details, bidirectional timing behavior (t_PHL/t_PLH ≤ 4.4 ns at 3.3V), B-port drive strength (±12 mA), and noise-reduction design value of Quiet Series™ circuitry.

Technical Context

The 74VCX2245WMX implements a dual-bus bidirectional transceiver architecture with independent A- and B-side I/Os, where data flow direction is controlled by the T/R signal and both ports enter high-impedance state when OE is asserted HIGH. Its CMOS-based design supports live insertion and power-off high-impedance behavior, ensuring safe hot-swap operation without bus contention.

It integrates 26Ω series resistors exclusively on B-port outputs to suppress transmission-line ringing and EMI-verified by dynamic VOLP/VOLV measurements under CL = 30 pF-and maintains JEDEC-compliant latchup immunity (> JESD78 Class II) and ESD robustness (HBM ≥ 2000 V).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.4 V to 3.6 V - Enables interoperability across 1.8 V, 2.5 V, and 3.3 V logic domains without level shifters
I/O Voltage Tolerance	Up to 3.6 V - Allows connection to higher-voltage buses while powered from lower V_CC
B-Port Output Drive	±12 mA at 3.0–3.6 V - Sufficient for driving moderate-capacitance lines (e.g., PCB traces up to ~10 cm)
Propagation Delay (A→B)	≤ 4.4 ns max at V_CC = 3.3 V - Supports >200 MHz bus toggle rates in point-to-point configurations
Output Skew	≤ 0.5 ns (CL = 30 pF) - Ensures tight timing alignment across all 8 B-port outputs during parallel data transfer
Quiet Series™ Noise Reduction	Dynamic VOLP ≤ 1.0 V at 3.3 V - Reduces ground bounce and crosstalk in dense routing environments
Power-Off High-Z	Valid I/O states maintained at V_CC = 0 V - Prevents back-driving and leakage during system power sequencing

Pinout & Package

74VCX2245WMX is packaged in a 20-lead SOIC (JEDEC MS-013, 0.300" wide, Package Code M20B), with gull-wing leads, 1.27 mm pitch, and Pb-free finish compliant with JEDEC J-STD-020B.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-low Output Enable	Drives both A and B ports into high-impedance when HIGH; must be pulled up externally during power-up per Note 1
2 (T/R)	Transmit/Receive Direction Control	LOW = B→A data flow; HIGH = A→B data flow; determines internal buffer path polarity
3–10 (A0–A7)	Side A Bidirectional I/O	Non-inverting buffer inputs/outputs; 3.6 V tolerant; no series resistance
11 (GND)	Ground Reference	Primary return path for V_CC current and signal integrity; requires low-inductance PCB connection
12–19 (B0–B7)	Side B Bidirectional I/O	Non-inverting buffer inputs/outputs with integrated 26 Ω series termination; reduces edge-induced EMI
20 (V_CC)	Supply Voltage Input	Accepts 1.4–3.6 V; decoupling capacitor (0.1 µF) required within 5 mm of pin

Key Features

Feature	Design Value
26 Ω Series Resistors on B Outputs	Reduces signal overshoot/ringing on PCB traces and cables, lowering radiated emissions without external components
3.6 V I/O Tolerance at 1.4–3.6 V V_CC	Enables mixed-voltage system interfacing (e.g., 1.8 V FPGA ↔ 3.3 V peripheral) without external translators
Power-Off High-Impedance I/O	Prevents back-powering or contention when V_CC is off, critical for hot-swap and modular backplane designs
Quiet Series™ EMI Reduction	Validated by dynamic VOLP/VOLV measurements; improves signal integrity in high-speed digital systems with shared ground planes
Live Insertion Support	Guaranteed high-Z state during power ramp-up/down when OE tied to V_CC via pull-up resistor

Applications

Memory Address Bus Interface	Low-Voltage Clock Distribution
Use Scenario: Driving address lines between a 1.8 V microcontroller and 3.3 V SRAM or Flash memory. IC Role / Device Role / Timing Role: Bidirectional transceiver managing address/data flow direction under CPU control; provides voltage-level translation and line termination. Use Value: Eliminates need for discrete level shifters and series resistors, reducing BOM count and PCB area while maintaining <4.4 ns propagation delay.	Use Scenario: Distributing a 3.3 V clock signal from a PLL to multiple 1.8 V logic devices on the same board. IC Role / Device Role / Timing Role: Unidirectional clock driver (T/R fixed HIGH) with controlled edge rate and B-port termination. Use Value: 26 Ω B-port series resistance dampens clock edge reflections, lowering jitter and improving setup/hold margins at receivers.
Hot-Swappable Peripheral Interface	Industrial Backplane Data Link
Use Scenario: Connecting removable I/O modules to a main controller in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Isolates module bus from backplane during insertion/removal using OE-controlled 3-STATE and power-off high-Z. Use Value: Prevents bus contention and ground bounce during live plug-in, meeting industrial hot-swap reliability requirements.	Use Scenario: Interfacing 2.5 V FPGA mezzanine cards with legacy 3.3 V backplane infrastructure. IC Role / Device Role / Timing Role: Bidirectional data transceiver supporting full-duplex communication with direction switching synchronized to frame boundaries. Use Value: 3.6 V I/O tolerance allows direct connection to backplane lines; skew ≤0.5 ns ensures deterministic timing across 8-bit data lanes.

Memory Address Bus Interface

Low-Voltage Clock Distribution

Use Scenario: Driving address lines between a 1.8 V microcontroller and 3.3 V SRAM or Flash memory.

IC Role / Device Role / Timing Role: Bidirectional transceiver managing address/data flow direction under CPU control; provides voltage-level translation and line termination.

Use Value: Eliminates need for discrete level shifters and series resistors, reducing BOM count and PCB area while maintaining <4.4 ns propagation delay.

Use Scenario: Distributing a 3.3 V clock signal from a PLL to multiple 1.8 V logic devices on the same board.

IC Role / Device Role / Timing Role: Unidirectional clock driver (T/R fixed HIGH) with controlled edge rate and B-port termination.

Use Value: 26 Ω B-port series resistance dampens clock edge reflections, lowering jitter and improving setup/hold margins at receivers.

Hot-Swappable Peripheral Interface

Industrial Backplane Data Link

Use Scenario: Connecting removable I/O modules to a main controller in programmable logic controllers (PLCs).

IC Role / Device Role / Timing Role: Isolates module bus from backplane during insertion/removal using OE-controlled 3-STATE and power-off high-Z.

Use Value: Prevents bus contention and ground bounce during live plug-in, meeting industrial hot-swap reliability requirements.

Use Scenario: Interfacing 2.5 V FPGA mezzanine cards with legacy 3.3 V backplane infrastructure.

IC Role / Device Role / Timing Role: Bidirectional data transceiver supporting full-duplex communication with direction switching synchronized to frame boundaries.

Use Value: 3.6 V I/O tolerance allows direct connection to backplane lines; skew ≤0.5 ns ensures deterministic timing across 8-bit data lanes.

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 series resistors on outputs; 3.6 V tolerant I/O; 1.65–3.6 V V_CC; 20-pin TSSOP only	Lacks B-port EMI suppression; requires external 22–33 Ω resistors for equivalent noise control	Select when board layout allows discrete termination and cost sensitivity outweighs EMI reduction benefit
74ALVC2245MTCX	Higher speed (t_PD ≤ 3.3 ns at 3.3 V); same 26 Ω B-port resistors; 1.65–3.6 V V_CC; TSSOP-20 package	Not rated for 1.4 V operation; unsuitable for ultra-low-voltage (1.4–1.6 V) FPGA I/O banks	Select when system V_CC ≥ 1.65 V and sub-4 ns timing is mandatory; verify thermal derating for continuous 12 mA B-port loads

Compared with SN74LVC2245APW and 74ALVC2245MTCX, the 74VCX2245WMX uniquely supports 1.4 V operation and embeds B-port termination-enabling simpler, more robust designs in mixed-voltage, noise-sensitive, or ultra-low-power embedded systems.

Availability

74VCX2245WMX is available at Aetrix Electronics and suitable for memory interface, clock distribution, hot-swap peripheral, and industrial backplane applications requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for 74VCX2245WMX 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; known for high-reliability logic, MOSFETs, and power management solutions.

The VCX logic family targets low-voltage, high-speed bus interface applications with emphasis on voltage translation, noise control, and hot-swap capability-designed specifically for portable, industrial, and telecom equipment operating across 1.4–3.6 V domains.

FAQ

What is the minimum V_CC voltage supported by the 74VCX2245WMX?

The 74VCX2245WMX operates down to 1.4 V V_CC, as specified in the Recommended Operating Conditions table. At this voltage, it maintains functional 3-STATE control, direction switching, and 3.6 V I/O tolerance-but B-port drive strength drops to ±1 mA and propagation delay increases to ≤8.4 ns (CL = 30 pF). This enables compatibility with ultra-low-power 1.4–1.6 V FPGA I/O banks and battery-powered subsystems.

Does the 74VCX2245WMX require external pull-up resistors on OE or T/R inputs?

Yes-the 74VCX2245WMX datasheet explicitly requires OE to be tied to V_CC through a pull-up resistor during power-up and power-down to guarantee high-impedance state (Note 1). The minimum resistor value depends on the driver's sourcing capability; typical values range from 4.7 kΩ to 10 kΩ. T/R has no such requirement but should be actively driven or held stable to avoid metastability during direction transitions.

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

The 26 Ω series resistance on each B-port output acts as source termination for controlled-impedance PCB traces (typically 50–75 Ω), reducing signal reflections, overshoot, and EMI. Measured dynamic parameters (VOLP ≤ 1.0 V at 3.3 V) confirm its effectiveness in suppressing ground bounce. This eliminates the need for eight discrete 22–33 Ω resistors, saving PCB space and assembly cost while improving consistency across all B outputs.

Can the 74VCX2245WMX be used in hot-swap applications?

Yes-the 74VCX2245WMX supports live insertion and withdrawal per datasheet Note 1, due to its power-off high-impedance I/O and guaranteed high-Z behavior when OE is pulled up. When V_CC is absent, both A and B ports present high impedance, preventing back-driving or contention on live backplanes. This makes it suitable for modular PLC I/O carriers and field-replaceable compute blades.

What is the maximum capacitive load the 74VCX2245WMX can drive on its B outputs?

The 74VCX2245WMX B outputs are characterized up to 30 pF (AC Electrical Characteristics) and 50 pF (with +300 ps delay penalty per Note 8). At 3.3 V V_CC, it delivers ±12 mA while maintaining VOL ≤ 0.55 V and VOH ≥ 2.2 V into 30 pF. For loads exceeding 30 pF, propagation delay increases linearly; for >50 pF, signal integrity degrades significantly-external buffering or reduced slew rate may be required.

74VCX2245WMX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74VCX

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

Packaging:: Tape & Reel (TR)

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:: 1.4V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74VCX2245WMX FAQ

1.How can I place an order for 74VCX2245WMX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCX2245WMX 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 74VCX2245WMX reliable?

The price and inventory of 74VCX2245WMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCX2245WMX is usually 5 days.

3.What payment methods are accepted for 74VCX2245WMX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCX2245WMX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VCX2245WMX?

74VCX2245WMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCX2245WMX 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 74VCX2245WMX?

For technical support, including 74VCX2245WMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCX2245WMX requirements.

6.How does Aetrix verify that 74VCX2245WMX is sourced from the original manufacturer or authorized distributors?

All 74VCX2245WMX 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 74VCX2245WMX meets industry standards.

7.What is the process for return or replacement of 74VCX2245WMX?

All 74VCX2245WMX units undergo pre-shipment inspection (PSI). If there is an issue with 74VCX2245WMX, 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 74VCX2245WMX part is unused and in its original packaging.

Return procedure for 74VCX2245WMX:

1.Submit a request within 90 days.

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

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