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onsemi 74LCXR2245WMX
- Part No.:
- 74LCXR2245WMX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LCXR2245WMX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,240
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Product details
Overview
74LCXR2245WMX 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 VCC = 3.3V, ±12mA drive capability at 3.0V, and 3-STATE control via OE and T/R inputs. It enables level-shifting between 2.3–3.6V buses and 5V systems in memory expansion and peripheral interconnect applications.
For engineers reviewing the 74LCXR2245WMX datasheet, pinout, applications, or equivalent options, key selection criteria include 5V tolerance with sub-3.6V supply operation, deterministic direction control via T/R, live-insertion support, output overshoot suppression via on-die 26Ω resistors, and SOIC-20 packaging for legacy board compatibility.
Technical Context
The 74LCXR2245WMX implements eight non-inverting bidirectional buffers with independent 3-STATE control per port, where data flow direction (A→B or B→A) is determined solely by the T/R input state. OE disables both ports simultaneously into high-impedance mode, supporting hot-swap operation when OE is pulled up during power sequencing.
Its advanced CMOS process delivers 8.0ns max tPD at 3.3V while maintaining ICC ≤ 10µA in quiescent state. The integrated 26Ω series resistors are placed on every output terminal - not internal to driver stages - directly reducing edge-induced EMI and signal reflections without requiring external termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V operating; supports 2.5V/3.3V logic domains with 5V-tolerant I/O |
| Propagation Delay | 8.0ns max (tPHL/tPLH) at VCC = 3.3V, CL = 50pF - ensures timing compliance in 100MHz bus interfaces |
| Output Drive | ±12mA at VCC = 3.0V - sufficient to drive 50Ω transmission lines or multiple CMOS loads |
| Input/Output Tolerance | –0.5V to +7.0V - enables safe interfacing with 5V peripherals without level shifters |
| Series Resistance | 26Ω on all A0–A7 and B0–B7 outputs - reduces overshoot/undershoot and simplifies PCB layout |
| Power-Down Leakage | IOFF ≤ 10µA at VCC = 0V, VI/VO = 5.5V - prevents backfeeding in powered-down subsystems |
| ESD Rating | HBM > 2000V, MM > 200V - meets industrial handling requirements without additional protection |
Pinout & Package
74LCXR2245WMX is housed in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide (M20B package), with standard pin pitch of 1.27mm and body width of 7.5mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-low global enable: drives both A and B ports into high-impedance when HIGH |
| 2 (T/R) | Transmit/Receive Control | Determines direction: LOW = B→A, HIGH = A→B; must be stable before data transfer |
| 3–10 (A0–A7) | Side A Bidirectional I/O | Non-inverting buffer terminals with 26Ω series resistor and 5V tolerance |
| 11 (GND) | Ground Reference | Primary return path for VCC current and signal reference; requires low-inductance connection |
| 12–19 (B0–B7) | Side B Bidirectional I/O | Non-inverting buffer terminals mirroring A-side functionality and electrical specs |
| 20 (VCC) | Supply Voltage | 2.3–3.6V nominal; powers internal logic and output drivers; bypass capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Supports mixed-voltage system integration without external level translators |
| Integrated 26Ω series resistors | Eliminates need for discrete series termination resistors on all 16 I/O lines |
| Live insertion/withdrawal support | High-impedance state maintained during power transitions when OE pulled up |
| Low dynamic power dissipation | CPD = 25pF at 3.3V/10MHz - reduces switching current and heat generation |
| Latch-up immunity | Exceeds 500mA per JEDEC JESD78 - ensures robustness in noisy industrial environments |
Applications
| Memory Expansion Interface | Legacy Peripheral Bridge |
|---|---|
|
Use Scenario: Connecting a 3.3V microcontroller bus to 5V SRAM or EPROM modules in embedded instrumentation. IC Role / Device Role: Bidirectional level-shifting transceiver enabling data exchange across voltage domains. Use Value: Eliminates discrete level shifters and pull-up networks while maintaining signal integrity via on-die 26Ω resistors. |
Use Scenario: Interfacing modern low-voltage FPGAs to legacy 5V parallel I/O peripherals such as printers or industrial DACs. IC Role / Device Role: Voltage-domain translator with direction control synchronized to host handshake signals. Use Value: Enables drop-in replacement of obsolete 74-series transceivers without redesigning termination or power distribution. |
| Hot-Swappable Backplane Slot | EMI-Sensitive Sensor Hub |
|
Use Scenario: Providing isolated, hot-pluggable data lanes in modular test equipment chassis with mixed-supply backplanes. IC Role / Device Role: Isolation and direction-controlled bus interface with controlled slew rate and impedance matching. Use Value: Prevents bus contention during card insertion/removal using OE-driven high-Z state and 5V-tolerant fault isolation. |
Use Scenario: Aggregating analog sensor outputs (via ADCs) onto a low-noise 3.3V digital bus in medical monitoring devices. IC Role / Device Role: Low-overshoot bidirectional buffer isolating sensitive analog sections from digital switching noise. Use Value: 26Ω series resistors suppress ringing and reduce radiated emissions below CISPR 22 Class B limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC2245APW,118 | No integrated series resistors; 3.3V-only I/O tolerance (not 5V); 6.7ns tPD at 3.3V | Requires external 22–33Ω series resistors for EMI control; unsuitable for direct 5V peripheral connection | Select when lower propagation delay is critical and external termination is acceptable |
| SN74AVC2245RGVR | Higher drive (±24mA); no built-in series resistors; supports 1.2–3.6V VCC; 5V-tolerant I/O | Needs external termination for overshoot control; wider VCC range but higher ICC (20µA typical) | Select for ultra-low-voltage operation down to 1.2V or higher drive strength, with added layout effort |
Compared with 74LCXR2245WMX, the 74LVC2245APW lacks integrated 26Ω resistors and 5V tolerance, limiting its use in mixed-voltage systems, while SN74AVC2245RGVR offers broader VCC support but shifts EMI mitigation responsibility to the PCB designer.
Availability
74LCXR2245WMX is available at Aetrix Electronics and suitable for memory expansion interfaces, legacy peripheral bridging, hot-swappable backplane slots, and EMI-sensitive sensor hubs requiring stable component supply and long-term obsolescence management.
Supply support for 74LCXR2245WMX 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 logic ICs before its acquisition by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and telecom infrastructure.
The 74LCXR2245WMX belongs to the LCX family of low-voltage, 5V-tolerant logic devices designed specifically for seamless integration between emerging low-power systems and legacy 5V subsystems.
FAQ
What is the maximum recommended VCC voltage for reliable operation of the 74LCXR2245WMX?
The 74LCXR2245WMX has a recommended operating VCC range of 2.3V to 3.6V. While its absolute maximum rating is +7.0V, operation above 3.6V violates the Recommended Operating Conditions and risks parametric degradation or accelerated wear-out. The 74LCXR2245WMX is optimized for 2.5V and 3.3V systems, and exceeding 3.6V voids guaranteed AC/DC performance specifications.
Does the 74LCXR2245WMX require external pull-up resistors on OE or T/R inputs?
Yes - the 74LCXR2245WMX requires a pull-up resistor on the OE input to ensure high-impedance state during power-up or power-down, as specified in Note 1 of the datasheet. The minimum resistance value depends on the current-sourcing capability of the driving source; typical values range from 4.7kΩ to 10kΩ. T/R may be driven directly but must be held stable before data transfer begins.
Can the 74LCXR2245WMX be used to replace older 74AC245 or 74ALS245 transceivers in existing designs?
The 74LCXR2245WMX can serve as a functional upgrade in many 74AC245/74ALS245 applications due to its pin-compatible SOIC-20 footprint, identical A/B/OE/T/R pinout, and enhanced 5V tolerance. However, designers must verify that the 26Ω series resistors do not over-dampen edge rates in high-speed (>25MHz) buses and confirm that the reduced VCC range (2.3–3.6V vs. 5V) aligns with system power architecture.
How does the 26Ω series resistor in the 74LCXR2245WMX affect signal integrity compared to standard transceivers?
The 26Ω series resistor in the 74LCXR2245WMX is placed directly in series with each output driver, providing controlled impedance matching to typical PCB trace impedances (40–70Ω). This reduces output overshoot and undershoot by damping ringing, lowering radiated EMI, and improving eye diagram margins - especially on unterminated stubs or short traces - without requiring layout-level resistor placement.
Is the 74LCXR2245WMX suitable for automotive applications per AEC-Q100?
No - the 74LCXR2245WMX is not qualified to AEC-Q100. Its specified operating temperature range is –40°C to +85°C, which meets industrial grade requirements but lacks the extended temperature testing, failure rate validation, and qualification documentation required for automotive use. For automotive designs, consider AEC-Q100-qualified alternatives such as the NXP 74LVC2245ABQ or ON Semiconductor NC7SZ245.
74LCXR2245WMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCXR
- 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:
- 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
74LCXR2245WMX FAQ
1.How can I place an order for 74LCXR2245WMX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCXR2245WMX 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 74LCXR2245WMX reliable?
The price and inventory of 74LCXR2245WMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXR2245WMX is usually 5 days.
3.What payment methods are accepted for 74LCXR2245WMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXR2245WMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCXR2245WMX?
74LCXR2245WMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCXR2245WMX 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 74LCXR2245WMX?
For technical support, including 74LCXR2245WMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXR2245WMX requirements.
6.How does Aetrix verify that 74LCXR2245WMX is sourced from the original manufacturer or authorized distributors?
All 74LCXR2245WMX 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 74LCXR2245WMX meets industry standards.
7.What is the process for return or replacement of 74LCXR2245WMX?
All 74LCXR2245WMX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXR2245WMX, 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 74LCXR2245WMX part is unused and in its original packaging.
Return procedure for 74LCXR2245WMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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