My Inquiry
My Account
onsemi 74LCXR2245MTC
- Part No.:
- 74LCXR2245MTC
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LCXR2245MTC.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,940
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74LCXR2245MTC 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 output drive 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 signal domains in compact TSSOP-20 packages.
For engineers reviewing the 74LCXR2245MTC datasheet, pinout, applications, or equivalent options, this device supports live insertion, reduces EMI via on-die 26Ω termination, delivers sub-10ns timing for high-speed bus interfacing, and maintains high-impedance during power sequencing when OE is pulled up.
Technical Context
The 74LCXR2245MTC implements eight non-inverting bidirectional buffers with independent 3-STATE control per port, where direction is determined by the T/R input and global enable/disable is managed by OE. Its advanced CMOS process achieves high speed while maintaining low ICC ≤ 10µA in quiescent state.
All I/O pins tolerate 0–5.5V DC regardless of VCC (2.3–3.6V), and each output includes an integrated 26Ω series resistor to suppress overshoot/undershoot without external components. Power-down behavior places both A and B ports in high-impedance state when OE is HIGH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V operating supply; supports mixed-voltage system interfacing |
| tPD Max | 8.0ns at VCC = 3.3V, CL = 50pF - enables ≥100MHz bus operation |
| I/O Voltage Tolerance | 0–5.5V on all inputs/outputs - allows direct connection to 5V logic without level shifters |
| Output Drive | ±12mA at VCC = 3.0V - sufficient to drive standard TTL loads and stubbed buses |
| Series Resistance | 26Ω on all A/B port outputs - eliminates need for discrete series termination resistors |
| ICC Max | 10µA at VCC = 3.3V - ultra-low static power for battery-sensitive applications |
| ESD Rating | >2000V HBM - robust handling in manufacturing and field environments |
Pinout & Package
74LCXR2245MTC is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm wide, with 0.65mm lead pitch. The package supports fine-pitch PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active LOW global enable; pulls both A and B ports into high-impedance when HIGH |
| 2 (T/R) | Transmit/Receive Control | Determines data flow direction: LOW = B→A, HIGH = A→B |
| 3–10 (A0–A7) | Side A Bidirectional I/O | Non-inverting buffer terminals; function as inputs or 3-STATE outputs depending on T/R and OE |
| 11 (GND) | Ground Reference | Primary return path for VCC and I/O currents; must be low-impedance |
| 12–19 (B0–B7) | Side B Bidirectional I/O | Non-inverting buffer terminals; mirror A-side behavior with opposite directionality |
| 20 (VCC) | Power Supply | 2.3–3.6V supply input; decoupling capacitor required within 1cm |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Enables seamless interface between 3.3V systems and legacy 5V peripherals without external translators |
| Integrated 26Ω series resistors | Reduces board space and BOM count by eliminating eight discrete termination resistors |
| Live insertion support | Prevents bus contention during hot-plug events via controlled high-Z state during power transitions |
| Low dynamic power dissipation | CPD = 25pF at 10MHz ensures minimal switching current in high-frequency bus applications |
| High noise immunity | Input hysteresis and proprietary EMI reduction circuitry suppress coupling from adjacent traces |
Applications
| PCI Bus Interface | Memory Expansion Module |
|---|---|
|
Use Scenario: Interfacing a 3.3V FPGA-based controller to a 5V PCI slot for add-in card design. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing address/data strobes between domains with precise 8ns timing alignment. Use Value: Eliminates discrete level shifters and termination resistors, reducing layer count and improving signal integrity on dense PCIe-adjacent layouts. |
Use Scenario: Adding external SRAM or Flash memory to a low-voltage microcontroller with 5V-compatible address latches. IC Role / Device Role / Timing Role: Direction-controlled bus buffer enabling read/write cycles across voltage domains while maintaining tPD < 10ns for timing-critical access. Use Value: Integrated 26Ω resistors suppress reflections on 10+ cm memory bus traces, avoiding timing violations at 40MHz burst rates. |
| Hot-Swappable I/O Card | Industrial PLC Backplane |
|
Use Scenario: Modular I/O module requiring safe insertion/removal while main backplane remains powered. IC Role / Device Role / Timing Role: Isolation transceiver enforcing high-Z state during power ramp-up/down via OE pull-up resistor coordination. Use Value: Prevents bus contention and latch-up risk during live swap, validated to exceed 500mA latch-up immunity per IEC 61000-4-2. |
Use Scenario: Connecting distributed 24V I/O modules to a 3.3V logic core in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Robust bidirectional interface translating sensor/actuator signals across isolated power domains with ESD-hardened I/O. Use Value: 2000V HBM rating and 5.5V I/O tolerance withstand industrial transients, reducing need for external TVS protection on every line. |
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 series resistors; requires external 22–33Ω termination; 5V-tolerant I/O only when VCC = 3.3V | Lacks built-in EMI suppression; higher layout sensitivity on long traces | Select when cost-per-unit is prioritized over board area and signal integrity assurance |
| 74AVC245BQX | Lower VCC range (1.2–3.6V); 10Ω series resistance; higher speed (tPD = 3.2ns) but reduced 5V tolerance margin | Better for ultra-low-voltage SoC interconnects; not recommended for sustained 5.5V I/O stress | Select when interfacing sub-1.8V cores with moderate 5V exposure, not full 5.5V tolerance requirement |
Compared with SN74LVC245APWR and 74AVC245BQX, the 74LCXR2245MTC uniquely combines guaranteed 5.5V I/O tolerance, factory-trimmed 26Ω termination, and live-insertion capability-making it optimal for industrial backplanes and PCI-adjacent designs where reliability trumps marginal speed gain.
Availability
74LCXR2245MTC is available at Aetrix Electronics and suitable for PCI bus interface, memory expansion module, hot-swappable I/O card, and industrial PLC backplane applications requiring stable component supply and long-term lifecycle continuity.
Supply support for 74LCXR2245MTC 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; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The 74LCXR2245MTC belongs to the LCX family of low-voltage, 5V-tolerant logic devices engineered specifically for mixed-signal bus interfacing in telecom, computing, and automation systems where voltage domain bridging and EMI control are critical.
FAQ
What is the maximum allowable input voltage on 74LCXR2245MTC I/O pins?
The 74LCXR2245MTC supports DC input voltages from –0.5V to +5.5V on all A and B port pins, independent of VCC (2.3–3.6V). This 5V tolerance enables direct connection to legacy 5V logic without external level-shifting circuitry, and is verified across the full operating temperature range of –40°C to +85°C.
Does 74LCXR2245MTC require external series resistors for EMI control?
No - the 74LCXR2245MTC integrates a precise 26Ω series resistor on every A and B port output, eliminating the need for eight discrete resistors. This on-die termination reduces PCB area, improves impedance matching, and suppresses overshoot/undershoot in high-speed bus traces up to 100MHz.
How does the OE pin behave during power-up in 74LCXR2245MTC?
The OE pin must be tied to VCC through a pull-up resistor during power-up to ensure the A and B ports remain in high-impedance state until valid logic levels are established. The minimum resistor value depends on the driver's sourcing capability, as specified in Note 1 of the datasheet, preventing bus contention during sequencing.
What is the propagation delay specification for 74LCXR2245MTC at 2.5V supply?
At VCC = 2.5V ± 0.2V, CL = 30pF, the 74LCXR2245MTC guarantees tPHL/tPLH ≤ 9.6ns (max), with typical performance near 5.2ns. This delay is measured under worst-case conditions and supports reliable operation in 2.5V system designs such as DDR memory interfaces and low-power FPGA I/O banks.
Is 74LCXR2245MTC compatible with lead-free reflow profiles?
Yes - the 74LCXR2245MTC is manufactured in JEDEC MO-153-compliant TSSOP packaging and meets J-STD-020B lead-free soldering requirements. It supports peak reflow temperatures up to 260°C for 10 seconds, making it suitable for standard Pb-free assembly lines without derating or special process adjustments.
74LCXR2245MTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCXR
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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
74LCXR2245MTC FAQ
1.How can I place an order for 74LCXR2245MTC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCXR2245MTC 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 74LCXR2245MTC reliable?
The price and inventory of 74LCXR2245MTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXR2245MTC is usually 5 days.
3.What payment methods are accepted for 74LCXR2245MTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXR2245MTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCXR2245MTC?
74LCXR2245MTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCXR2245MTC 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 74LCXR2245MTC?
For technical support, including 74LCXR2245MTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXR2245MTC requirements.
6.How does Aetrix verify that 74LCXR2245MTC is sourced from the original manufacturer or authorized distributors?
All 74LCXR2245MTC 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 74LCXR2245MTC meets industry standards.
7.What is the process for return or replacement of 74LCXR2245MTC?
All 74LCXR2245MTC units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXR2245MTC, 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 74LCXR2245MTC part is unused and in its original packaging.
Return procedure for 74LCXR2245MTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74LCXR2245MTC Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
