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onsemi 74LCXR2245WM
- Part No.:
- 74LCXR2245WM
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LCXR2245WM.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,155
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Product details
Overview
74LCXR2245WM 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 legacy 5V systems in embedded data paths.
For engineers reviewing the 74LCXR2245WM datasheet, pinout, applications, or equivalent options, key selection criteria include 5V tolerance under 3.3V VCC operation, live-insertion support, output skew ≤1.0ns, power-down high-impedance behavior, and SOIC-20 package compatibility with JEDEC MS-013 footprint.
Technical Context
The 74LCXR2245WM implements eight non-inverting bidirectional buffers with independent direction control (T/R) and global 3-STATE enable (OE), enabling dynamic bus arbitration in mixed-voltage systems. Its advanced CMOS process delivers high-speed switching while maintaining <10µA quiescent ICC at 3.3V.
All I/O pins feature 5V tolerance across 2.3–3.6V VCC operation, with built-in 26Ω series resistors reducing overshoot/undershoot without external components. The device supports hot-plug operation via controlled high-impedance transitions during power-up/down when OE is pulled up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V operating supply; enables direct interface with 2.5V/3.3V logic rails |
| tPD Max | 8.0ns at VCC = 3.3V, CL = 50pF - ensures sub-10ns timing margin in high-speed data transfer |
| I/O Voltage Tolerance | 0–5.5V input/output range - allows safe connection to 5V peripherals without level shifters |
| Output Drive | ±12mA at VCC = 3.0V - sufficient to drive standard TTL loads and moderate capacitive buses |
| Series Resistance | 26Ω on all A/B port outputs - damps reflections and reduces EMI without discrete resistors |
| ICC Max | 10µA quiescent current - supports ultra-low-power standby modes in battery-sensitive designs |
| ESD Rating | HBM > 2000V - provides robust handling protection during board assembly and field service |
Pinout & Package
74LCXR2245WM is housed in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide, with standard 1.27mm pitch and gull-wing leads. Pin 1 is marked by a notch or dot; pin 10 is VCC, pin 20 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE | Global Output Enable Input | Active-Low control: drives both A and B ports into high-impedance state when HIGH |
| T/R | Direction Control Input | LOW = B→A data flow; HIGH = A→B data flow; determines signal path directionality |
| A0–A7 | Side-A Bidirectional I/O | Connects to low-voltage (2.3–3.6V) bus; 5V-tolerant; includes 26Ω series resistor |
| B0–B7 | Side-B Bidirectional I/O | Connects to 5V or mixed-voltage bus; identical 5V tolerance and damping as A-side |
| VCC | Power Supply | Supplies core logic; must be decoupled locally; supports 2.3–3.6V operation only |
| GND | Ground Reference | Common return for all I/O and internal circuitry; requires low-inductance PCB connection |
Key Features
| Feature | Design Value |
|---|---|
| 5V-Tolerant I/O | Enables direct interfacing with 5V peripherals while powered from 2.3–3.6V rails-eliminates external level translators |
| Integrated 26Ω Series Resistors | Reduces output ringing and EMI emissions without requiring external termination components on either bus side |
| Live Insertion Support | Guarantees high-impedance state during power sequencing when OE is pulled up-prevents bus contention during hot-swap |
| Low Propagation Skew | ≤1.0ns output-to-output skew ensures simultaneous edge alignment across all 8 channels for synchronous data capture |
| Ultra-Low ICC | 10µA max quiescent supply current enables use in always-on subsystems with strict power budgets |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Expansion Bus |
|---|---|
Use Scenario: Connecting a 3.3V ARM-based controller to legacy 5V I/O modules over a shared parallel backplane. IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver managing data flow direction and isolating voltage domains. Use Value: Eliminates need for discrete level shifters and series resistors-reducing BOM count and PCB area while ensuring signal integrity at 20MHz bus rates. | Use Scenario: Expanding GPIO count of a low-power MCU using an external 8-bit peripheral register mapped into memory space. IC Role / Device Role / Timing Role: Controlled-direction buffer enabling read/write access to external registers via shared address/data bus. Use Value: 8.0ns tPD and 1.0ns skew allow reliable 50MHz CPU access timing; 5V tolerance protects against overvoltage from misconfigured peripherals. |
| Laptop Docking Station Data Bridge | Automotive Infotainment Subsystem Link |
Use Scenario: Bridging a 3.3V host processor to 5V-compatible display timing controllers and audio codecs in modular docking hardware. IC Role / Device Role / Timing Role: Hot-pluggable bidirectional transceiver supporting plug-and-play detection and clean bus isolation. Use Value: Live insertion capability prevents bus glitches during docking; 26Ω damping suppresses EMI in compact, high-density layouts near RF sections. | Use Scenario: Interfacing a 2.5V automotive microcontroller to 5V CAN transceivers and sensor signal conditioners in infotainment head units. IC Role / Device Role / Timing Role: Mixed-voltage bus translator with fail-safe high-Z state during MCU reset or brown-out. Use Value: Power-down leakage <10µA maintains system sleep current targets; latch-up immunity >500mA meets AEC-Q100 stress requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | No integrated 26Ω resistors; 3.6V max VCC; 5V-tolerant inputs only (not outputs) | Requires external series resistors for EMI control; unsuitable for 5V-driven outputs | Select when cost sensitivity outweighs EMI performance and full 5V I/O tolerance is unnecessary |
| 74AVC245PW | Lower VCC range (1.2–3.6V); no 5V tolerance; higher speed (tPD = 2.8ns @ 1.8V) | Not compatible with 5V buses; requires additional level-shifting circuitry for legacy interfaces | Select for ultra-low-voltage, high-speed applications where 5V interoperability is absent |
Compared with SN74LVC245APWR and 74AVC245PW, the 74LCXR2245WM uniquely combines full 5V I/O tolerance, integrated 26Ω damping, and live-insertion support-making it the only option among the three qualified for mixed-voltage hot-swap bus bridging without external components.
Availability
74LCXR2245WM is available at Aetrix Electronics and suitable for industrial automation backplanes, embedded microcontroller expansion interfaces, and automotive infotainment subsystems requiring stable component supply and long-term lifecycle assurance.
Supply support for 74LCXR2245WM 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 analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and automotive systems.
The 74LCXR2245WM belongs to the LCX family of low-voltage, 5V-tolerant logic devices designed specifically for seamless voltage-domain bridging in mixed-supply systems with stringent EMI and hot-swap requirements.
FAQ
What is the maximum operating temperature range for the 74LCXR2245WM?
The 74LCXR2245WM is rated for free-air operating temperatures from –40°C to +85°C, making it suitable for industrial and extended-temperature embedded applications. This range is validated across all specified VCC (2.3–3.6V) and I/O (0–5.5V) conditions, with AC timing parameters guaranteed within this span.
Does the 74LCXR2245WM require external pull-up resistors on OE or T/R inputs?
Yes-the 74LCXR2245WM requires OE to be tied to VCC through a pull-up resistor during power-up/down to ensure predictable high-impedance behavior; the minimum resistance value depends on the driver's sourcing capability, as specified in the datasheet note. T/R may be driven directly but must not float.
Can the 74LCXR2245WM drive a 50pF load at 3.3V while meeting its 8.0ns tPD specification?
Yes-the 74LCXR2245WM guarantees a maximum propagation delay of 8.0ns at VCC = 3.3V ± 0.3V with CL = 50pF, as confirmed in the AC Electrical Characteristics table. This specification applies to both A→B and B→A directions under standard test conditions.
Is the 74LCXR2245WM pin-compatible with other 20-pin transceivers like the 74LVC245?
No-the 74LCXR2245WM uses a distinct pinout: OE and T/R are dedicated control inputs, whereas 74LVC245 uses OE and DIR. Signal pins A0–A7 and B0–B7 occupy different positions, and the 74LCXR2245WM includes integrated 26Ω resistors not present in LVC variants-requiring PCB layout changes for substitution.
What is the purpose of the 26Ω series resistors on the 74LCXR2245WM outputs?
The 26Ω series resistors on all A and B port outputs of the 74LCXR2245WM damp signal reflections and reduce overshoot/undershoot on transmission lines, lowering radiated EMI without requiring external components-critical for maintaining signal integrity in compact, high-speed digital interconnects.
74LCXR2245WM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCXR
- 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:
- 12mA, 12mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74LCXR2245WM FAQ
1.How can I place an order for 74LCXR2245WM through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCXR2245WM 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 74LCXR2245WM reliable?
The price and inventory of 74LCXR2245WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXR2245WM is usually 5 days.
3.What payment methods are accepted for 74LCXR2245WM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXR2245WM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCXR2245WM?
74LCXR2245WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCXR2245WM 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 74LCXR2245WM?
For technical support, including 74LCXR2245WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXR2245WM requirements.
6.How does Aetrix verify that 74LCXR2245WM is sourced from the original manufacturer or authorized distributors?
All 74LCXR2245WM 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 74LCXR2245WM meets industry standards.
7.What is the process for return or replacement of 74LCXR2245WM?
All 74LCXR2245WM units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXR2245WM, 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 74LCXR2245WM part is unused and in its original packaging.
Return procedure for 74LCXR2245WM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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