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

onsemi 74LCXR2245MTCX

Name: 74LCXR2245MTCX
Brand: onsemi
SKU: 74LCXR2245MTCX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCXR2245MTCX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: 74LCXR2245MTCX.pdf

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

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Product details

Overview

74LCXR2245MTCX from Fairchild Semiconductor is a low-voltage bidirectional transceiver with 5V-tolerant I/O, 26Ω integrated series resistors on all A/B ports, 8.0ns max propagation delay at 3.3V, ±12mA drive strength at 3.0V, and 3-STATE control via OE and T/R inputs-designed for voltage-level translation between 2.3–3.6V buses and 5V systems in embedded interface applications.

For engineers reviewing the 74LCXR2245MTCX datasheet, pinout, applications, or equivalent options, key selection criteria include 5V tolerance without external clamping, built-in 26Ω termination for EMI reduction, live-insertion support, power-down high-impedance behavior, and TSSOP-20 packaging for space-constrained board layouts.

Technical Context

The 74LCXR2245MTCX implements eight non-inverting bidirectional buffers with independent direction control via T/R and global 3-STATE enable via OE. Its CMOS-based architecture supports simultaneous 2.3–3.6V V_CC operation while tolerating 0–5.5V input/output signals-enabling safe interfacing between mixed-voltage domains without level-shifting circuitry.

All outputs feature integrated 26Ω series resistors to suppress overshoot/undershoot during fast edge transitions, and the device maintains high-impedance I/O during power-up/down when OE is pulled up-a critical requirement for hot-swap bus architectures and backplane designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3V–3.6V operating supply; enables compatibility with 2.5V and 3.3V logic systems
t_PD Max	8.0ns at V_CC = 3.3V, CL = 50pF-supports >100MHz data rates in point-to-point links
I_OH/I_OL	±12mA at V_CC = 3.0V-drives standard TTL loads and short PCB traces without external buffers
Input Voltage Range	0–5.5V DC tolerant-eliminates need for external clamping diodes when connected to 5V buses
Series Resistance	26Ω on all A/B port outputs-reduces ringing and EMI without discrete resistors or layout tuning
ICC Max	10µA quiescent current-minimizes standby power in battery-backed or always-on subsystems
ESD Rating	HBM > 2000V-meets industrial handling requirements without additional protection circuitry

Pinout & Package

74LCXR2245MTCX is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm body width, 0.65mm lead pitch, with exposed pad not present. Pin 1 marked by notch or dot; pin 10 = GND, pin 20 = V_CC.

Pin/Terminal	Circuit Role	Design Meaning
OE	Output Enable Input	Active-low global 3-STATE control for both A and B ports; must be pulled up during power sequencing
T/R	Transmit/Receive Control	Determines data flow direction: LOW = B→A, HIGH = A→B; no internal pull-up/pull-down
A0–A7	Side A I/O Terminals	Bidirectional data lines with 5V-tolerant inputs and 26Ω series resistors on output path
B0–B7	Side B I/O Terminals	Bidirectional data lines mirroring A-side electrical characteristics and termination
V_CC	Power Supply	Single 2.3–3.6V supply; powers internal logic and I/O buffers
GND	Ground Reference	Common return for all signals and supply; two dedicated pins (10 and 19) reduce ground bounce

Key Features

Feature	Design Value
5V-tolerant I/O	Enables direct connection to legacy 5V buses without external level shifters or clamping networks
Integrated 26Ω series resistors	Reduces signal integrity issues (overshoot/undershoot/ringing) on both A and B ports without discrete components
Live insertion/withdrawal support	Guarantees high-impedance state during power transitions when OE is properly biased-critical for hot-plug backplanes
Low dynamic power dissipation	25pF typical power-dissipation capacitance enables efficient switching at high frequencies with minimal heat generation
Advanced CMOS process	Delivers 8ns propagation delay at 3.3V while maintaining <10µA ICC-optimizing speed/power trade-off for portable and dense systems

Applications

PCI Bus Interface	Memory Module Interconnect
Use Scenario: Bridging 3.3V controller logic to 5V PCI slot signaling in embedded computing modules. IC Role / Device Role / Timing Role: Bidirectional voltage translator and bus driver with direction control synchronized to PCI FRAME# and IRDY#. Use Value: Eliminates discrete level shifters and termination resistors, reducing BOM count and PCB area while meeting PCI electrical compliance.	Use Scenario: Interfacing DDR SDRAM controller (2.5V/3.3V) to SPD EEPROM (5V-tolerant I²C) on DIMM modules. IC Role / Device Role / Timing Role: Isolates and translates I²C clock/data lines between voltage domains with controlled slew rate. Use Value: Built-in 26Ω resistors dampen I²C edge rates to meet rise-time specifications without external RC networks.
Industrial PLC Backplane	Test Equipment Signal Routing
Use Scenario: Hot-swappable I/O module communication across mixed-voltage backplane segments (2.5V FPGA, 5V analog front-end). IC Role / Device Role / Timing Role: Direction-controlled transceiver enabling real-time data exchange with automatic high-Z during card insertion/removal. Use Value: OE-controlled 3-STATE and 5V tolerance prevent bus contention and latch-up during live maintenance operations.	Use Scenario: Reconfigurable signal path routing between 3.3V DUT interface and 5V instrument bus in automated test systems. IC Role / Device Role / Timing Role: Programmable bidirectional switch supporting multiple DUT configurations via T/R and OE control lines. Use Value: Sub-10ns propagation delay ensures timing-critical test vectors remain aligned across voltage domains.

PCI Bus Interface

Memory Module Interconnect

Use Scenario: Bridging 3.3V controller logic to 5V PCI slot signaling in embedded computing modules.

IC Role / Device Role / Timing Role: Bidirectional voltage translator and bus driver with direction control synchronized to PCI FRAME# and IRDY#.

Use Value: Eliminates discrete level shifters and termination resistors, reducing BOM count and PCB area while meeting PCI electrical compliance.

Use Scenario: Interfacing DDR SDRAM controller (2.5V/3.3V) to SPD EEPROM (5V-tolerant I²C) on DIMM modules.

IC Role / Device Role / Timing Role: Isolates and translates I²C clock/data lines between voltage domains with controlled slew rate.

Use Value: Built-in 26Ω resistors dampen I²C edge rates to meet rise-time specifications without external RC networks.

Industrial PLC Backplane

Test Equipment Signal Routing

Use Scenario: Hot-swappable I/O module communication across mixed-voltage backplane segments (2.5V FPGA, 5V analog front-end).

IC Role / Device Role / Timing Role: Direction-controlled transceiver enabling real-time data exchange with automatic high-Z during card insertion/removal.

Use Value: OE-controlled 3-STATE and 5V tolerance prevent bus contention and latch-up during live maintenance operations.

Use Scenario: Reconfigurable signal path routing between 3.3V DUT interface and 5V instrument bus in automated test systems.

IC Role / Device Role / Timing Role: Programmable bidirectional switch supporting multiple DUT configurations via T/R and OE control lines.

Use Value: Sub-10ns propagation delay ensures timing-critical test vectors remain aligned across voltage domains.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC2245APWR	No integrated series resistors; 5V-tolerant I/O but requires external 26Ω resistors for EMI control	Lacks built-in termination-requires PCB layout adjustments and adds 16 passive components	Select when cost sensitivity outweighs EMI performance and board space constraints
74AVC2245PW,118	Lower V_CC range (1.2–3.6V); higher speed (t_PD = 3.2ns); no 5V tolerance-requires external clamping	Not suitable for direct 5V bus interfacing; needs Schottky clamps or level translators	Select for ultra-low-voltage systems where 5V tolerance is unnecessary and speed is critical

Compared with SN74LVC2245APWR and 74AVC2245PW,118, the 74LCXR2245MTCX uniquely combines 5V tolerance, integrated 26Ω termination, and live-insertion capability in a single TSSOP-20 package-reducing design complexity for mixed-voltage hot-swap interfaces without sacrificing signal integrity.

Availability

74LCXR2245MTCX is available at Aetrix Electronics and suitable for PCI bus bridging, memory module interconnects, industrial PLC backplanes, and test equipment signal routing requiring stable component supply and long-term lifecycle support.

Supply support for 74LCXR2245MTCX 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 semiconductor company specializing in power management, signal conditioning, and interface ICs before its acquisition by ON Semiconductor in 2016.

The LCXR family was engineered for robust mixed-voltage system interfacing-targeting industrial backplanes, telecom line cards, and embedded controllers needing 5V-tolerant, low-power, high-speed bidirectional data transfer.

FAQ

What is the maximum recommended V_CC voltage for reliable operation of the 74LCXR2245MTCX?

The 74LCXR2245MTCX has a recommended operating V_CC range of 2.3V to 3.6V. While absolute maximum rating allows up to +7.0V, operation above 3.6V violates specification limits and risks parametric failure, increased ICC, and reduced reliability. The 74LCXR2245MTCX is not rated for 5V V_CC; it achieves 5V I/O tolerance while powered from 3.3V or lower.

Does the 74LCXR2245MTCX require external pull-up resistors on OE or T/R inputs?

Yes-the 74LCXR2245MTCX has no internal pull-up or pull-down on OE or T/R. OE must be tied to V_CC via an external pull-up resistor to ensure high-impedance state during power-up; minimum value depends on driver sourcing capability. T/R requires active driving-floating this pin causes undefined direction and potential bus contention. This behavior is explicitly documented in Note 1 of the 74LCXR2245MTCX datasheet.

How does the integrated 26Ω series resistor in the 74LCXR2245MTCX affect signal integrity?

Each output of the 74LCXR2245MTCX includes a 26Ω series resistor that damps fast edge transitions, reducing overshoot, undershoot, and ringing on PCB traces up to ~10 cm in length. This eliminates the need for discrete termination resistors and simplifies layout-particularly beneficial in compact, high-density designs where trace impedance control is impractical. Measured dynamic peak VOL remains ≤0.5V under load, confirming effective suppression.

Can the 74LCXR2245MTCX safely interface with a 5V microcontroller's GPIO pins?

Yes-the 74LCXR2245MTCX inputs and outputs are DC 5V-tolerant (0–5.5V), meaning they can accept and drive 5V logic levels while operating from a 2.3–3.6V V_CC. This allows direct connection to 5V microcontrollers without level shifters or clamping diodes. However, V_CC must remain within 2.3–3.6V; applying 5V to V_CC will damage the 74LCXR2245MTCX.

Is the 74LCXR2245MTCX suitable for hot-swap applications, and what design precautions apply?

Yes-the 74LCXR2245MTCX supports live insertion/withdrawal per datasheet Note 1. To guarantee high-impedance I/O during power transitions, OE must be externally pulled up to V_CC with a resistor sized per the driver's sourcing capability. Unused bus terminals in HIGH-Z state must be held HIGH or LOW (not floating) to prevent leakage-induced logic glitches-this requirement is specified in Note 2 and applies directly to the 74LCXR2245MTCX.

74LCXR2245MTCX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCXR

Package/Case:: 20-TSSOP (0.173", 4.40mm 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:: 12mA, 12mA

Voltage - Supply:: 2V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

74LCXR2245MTCX FAQ

1.How can I place an order for 74LCXR2245MTCX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCXR2245MTCX 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 74LCXR2245MTCX reliable?

The price and inventory of 74LCXR2245MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXR2245MTCX is usually 5 days.

3.What payment methods are accepted for 74LCXR2245MTCX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXR2245MTCX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCXR2245MTCX?

74LCXR2245MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCXR2245MTCX 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 74LCXR2245MTCX?

For technical support, including 74LCXR2245MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXR2245MTCX requirements.

6.How does Aetrix verify that 74LCXR2245MTCX is sourced from the original manufacturer or authorized distributors?

All 74LCXR2245MTCX 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 74LCXR2245MTCX meets industry standards.

7.What is the process for return or replacement of 74LCXR2245MTCX?

All 74LCXR2245MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXR2245MTCX, 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 74LCXR2245MTCX part is unused and in its original packaging.

Return procedure for 74LCXR2245MTCX:

1.Submit a request within 90 days.

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

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