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onsemi 74LCXR2245MSAX
- Part No.:
- 74LCXR2245MSAX
- Manufacturer:
- onsemi
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74LCXR2245MSAX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,444
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Product details
Overview
74LCXR2245MSAX from Fairchild Semiconductor is a low-voltage, 8-bit bidirectional transceiver with 5V-tolerant I/O, 26Ω integrated series resistors on all A/B ports, 8.0ns max propagation delay at 3.3V, and 3-STATE control via OE and T/R inputs-designed for voltage-level translation between 2.3–3.6V buses and 5V logic in embedded bus interfaces.
For engineers reviewing the 74LCXR2245MSAX datasheet, pinout, applications, or equivalent options, key selection criteria include 5V tolerance without external clamping, live-insertion support, ±12mA drive at 3.0V, 10µA max ICC quiescent current, and SSOP-20 package compatibility with JEDEC MO-150 footprint.
Technical Context
The 74LCXR2245MSAX implements non-inverting bidirectional buffering with dual 3-STATE control: OE enables/disables both A and B ports simultaneously, while T/R selects data direction (A→B or B→A). Its advanced CMOS process delivers high-speed operation with low power dissipation.
All I/O pins feature 5V tolerance across VCC = 2.3–3.6V, and each output includes an integrated 26Ω series resistor to suppress overshoot/undershoot-eliminating need for discrete termination in point-to-point or lightly loaded stubbed bus topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V operating supply; supports mixed-voltage system interfacing |
| Propagation Delay | 8.0ns max (VCC = 3.3V, CL = 50pF); enables ≤125MHz bus timing margin |
| I/O Voltage Tolerance | 0–5.5V input/output range; allows direct connection to 5V TTL without level shifters |
| Output Drive | ±12mA at VCC = 3.0V; sufficient for driving 50Ω transmission lines or multiple LVTTL loads |
| Quiescent ICC | 10µA max; enables ultra-low-power standby in battery-backed or always-on systems |
| Series Resistance | 26Ω integrated on all A/B outputs; reduces EMI and eliminates external series resistors |
| ESD Rating | Human Body Model > 2000V; supports safe handling during board assembly and field service |
Pinout & Package
74LCXR2245MSAX is housed in a 20-lead Shrink Small Outline Package (SSOP), JEDEC MO-150 compliant, 5.3mm wide, with 0.65mm lead pitch and exposed pad not present. Pin 1 marked by notch or dot; pin 10 = GND, pin 20 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE | Active-Low Output Enable | Drives both A and B ports into high-impedance when HIGH; requires pull-up for power-up safety |
| T/R | Direction Control Input | LOW = B→A data flow; HIGH = A→B data flow; latched internally |
| A0–A7 | Bidirectional Port A I/O | 8-bit interface side connected to lower-voltage bus (e.g., 2.5V/3.3V microcontroller) |
| B0–B7 | Bidirectional Port B I/O | 8-bit interface side connected to 5V legacy bus or peripheral |
| VCC | Power Supply | Single 2.3–3.6V supply powers internal logic and I/O buffers |
| GND | Ground Reference | Common return path for logic and I/O; decoupling capacitor required at pin 10 |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Enables interoperability between 3.3V SoCs and 5V peripherals without external voltage translators |
| Integrated 26Ω series resistors | Reduces signal ringing and EMI on PCB traces-no layout changes needed for impedance matching |
| Live insertion support | High-impedance state during power sequencing prevents bus contention during hot-swap operations |
| Low ICC quiescent current | 10µA max draw allows use in energy-sensitive applications like portable instrumentation or sensor nodes |
| Latch-up immunity | Exceeds 500mA per JEDEC JESD78, ensuring robustness against transient overcurrent events |
Applications
| Industrial PLC Backplane Interface | Legacy Peripheral Adapter Board |
|---|---|
Use Scenario: Interfacing a modern 3.3V ARM-based controller to a 5V RS-485 transceiver and opto-isolated I/O modules on a DIN-rail mounted PLC backplane. IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver managing data flow between controller and legacy fieldbus peripherals. Use Value: Eliminates discrete level-shifting ICs and series resistors-reducing BOM count and PCB area while maintaining signal integrity at 10Mbps. | Use Scenario: Adding USB-to-parallel or USB-to-serial bridge functionality to an aging test instrument using a 5V parallel port header. IC Role / Device Role / Timing Role: Level-translating buffer enabling communication between a 3.3V USB bridge IC and 5V printer/plotter interface. Use Value: Supports hot-plug capability and withstands 5V signal swings without damage-extending field life of legacy equipment. |
| Embedded Memory Expansion Module | Automotive Diagnostic Interface Adapter |
Use Scenario: Connecting a low-power 2.5V FPGA memory controller to a 5V SRAM or Flash module on a modular compute card. IC Role / Device Role / Timing Role: Bidirectional data path translator with controlled slew rate for reliable read/write cycles up to 50MHz. Use Value: Integrated 26Ω resistors suppress reflections on short memory bus traces-avoiding timing violations and setup/hold failures. | Use Scenario: Building a compact OBD-II to CAN/LIN diagnostic adapter that bridges a 3.3V microcontroller to 5V vehicle bus transceivers. IC Role / Device Role / Timing Role: Isolating and translating control signals (e.g., reset, enable, mode select) between domains. Use Value: 5V tolerance and ±12mA drive ensure compatibility with automotive-grade 5V logic families-even under load dump conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional voltage-translating transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC2245APWR | No integrated series resistors; 32mA drive; 3.3V-only I/O tolerance (not 5V tolerant) | Requires external 26Ω resistors and clamping diodes for 5V bus interfacing | Select when higher drive strength is needed and board space allows discrete termination |
| 74AVC2245PW,118 | 2.3–3.6V VCC; 5V-tolerant I/O; no integrated resistors; 24mA drive | Lacks built-in 26Ω termination-requires careful PCB routing or external damping | Prefer when lower propagation skew (<0.5ns) is critical and EMI mitigation is handled at layout level |
Compared with SN74LVC2245APWR and 74AVC2245PW,118, the 74LCXR2245MSAX uniquely integrates 26Ω series resistors and guarantees 5V tolerance without external components-reducing design risk and validation effort for mixed-voltage bus bridging.
Availability
74LCXR2245MSAX is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy peripheral adapter boards, embedded memory expansion modules, and automotive diagnostic interface adapters requiring stable component supply and long-term obsolescence management.
Supply support for 74LCXR2245MSAX 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 LCXR family was designed specifically for low-voltage, 5V-tolerant bidirectional bus interfacing-targeting applications where voltage translation, EMI reduction, and live-insertion reliability are critical.
FAQ
What is the maximum data rate supported by the 74LCXR2245MSAX?
The 74LCXR2245MSAX achieves 8.0ns max propagation delay at VCC = 3.3V and CL = 50pF, supporting reliable bidirectional data transfer up to approximately 125MHz in point-to-point configurations. Actual achievable rate depends on bus loading, trace length, and termination-though the integrated 26Ω resistors help maintain signal integrity beyond 50MHz without external damping.
Does the 74LCXR2245MSAX require external pull-up resistors on OE or T/R inputs?
Yes-the 74LCXR2245MSAX datasheet specifies that OE must be tied to VCC through a pull-up resistor during power-up/down to guarantee high-impedance state and prevent bus contention. T/R may be driven directly but should not float; unused inputs must be held HIGH or LOW per recommended operating conditions.
Can the 74LCXR2245MSAX operate with a 2.5V supply?
Yes-the 74LCXR2245MSAX is fully specified for VCC = 2.3V to 3.6V, including 2.5V operation. At 2.5V, propagation delay increases to 9.6ns max (CL = 30pF), and output drive reduces to ±4mA, but 5V I/O tolerance and 26Ω series resistance remain fully functional.
Is the 74LCXR2245MSAX pin-compatible with other LCX-series transceivers?
Yes-the 74LCXR2245MSAX shares identical pinout and function mapping with 74LCX2245 variants (e.g., 74LCX2245WM, 74LCX2245SJ), differing only in package type (SSOP vs SOIC/SOP/TSSOP). All LCX2245 devices use the same 20-pin arrangement, OE/T/R control scheme, and A/B port assignment.
What is the thermal performance of the 74LCXR2245MSAX in SSOP package?
The 74LCXR2245MSAX in MSA20 (SSOP-20) package has a typical junction-to-ambient thermal resistance (θJA) of 120°C/W. Under worst-case conditions (TA = 85°C, ICC = 10µA, IO = ±12mA), power dissipation remains below 15mW-keeping junction temperature well within safe limits without heatsinking.
74LCXR2245MSAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCXR
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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-SSOP
74LCXR2245MSAX FAQ
1.How can I place an order for 74LCXR2245MSAX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCXR2245MSAX 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 74LCXR2245MSAX reliable?
The price and inventory of 74LCXR2245MSAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXR2245MSAX is usually 5 days.
3.What payment methods are accepted for 74LCXR2245MSAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXR2245MSAX transactions.
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4.How is shipping managed for 74LCXR2245MSAX?
74LCXR2245MSAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCXR2245MSAX 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 74LCXR2245MSAX?
For technical support, including 74LCXR2245MSAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXR2245MSAX requirements.
6.How does Aetrix verify that 74LCXR2245MSAX is sourced from the original manufacturer or authorized distributors?
All 74LCXR2245MSAX 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 74LCXR2245MSAX meets industry standards.
7.What is the process for return or replacement of 74LCXR2245MSAX?
All 74LCXR2245MSAX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXR2245MSAX, 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 74LCXR2245MSAX part is unused and in its original packaging.
Return procedure for 74LCXR2245MSAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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