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onsemi 74LCXZ245WM
- Part No.:
- 74LCXZ245WM
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LCXZ245WM.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,261
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Product details
Overview
74LCXZ245WM from Fairchild Semiconductor is a low-voltage, bidirectional 8-bit transceiver with 3-STATE outputs, designed for bus-oriented data transfer between 2.5V/3.3V domains and 5V signal environments. It features 5V-tolerant I/O, 7.0 ns max propagation delay at VCC = 3.3V, ±24 mA output drive at 3.0V, and power-down high-impedance protection during power-up/down - used in mixed-voltage motherboard interconnects and memory expansion interfaces.
For engineers reviewing the 74LCXZ245WM datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional flow control via T/R, OE-gated 3-STATE operation, 5V tolerance without level shifters, and SOIC-20 packaging compatible with JEDEC MS-013 footprint.
Technical Context
The 74LCXZ245WM implements non-inverting bidirectional buffering with independent OE (output enable) and T/R (transmit/receive) control logic. Its CMOS architecture supports dual-supply interoperability: VCC operates at 2.3–3.6V while inputs and outputs tolerate 0–5.5V, enabling direct connection to legacy 5V buses without external clamping or translation.
During power transitions (VCC = 0–1.5V), all I/O pins enter a guaranteed high-impedance state, preventing bus contention. The device integrates patented noise/EMI reduction circuitry and meets latch-up immunity >500 mA per JEDEC JESD78.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables stable operation in both 2.5V and 3.3V system rails |
| Propagation Delay | 7.0 ns max at VCC = 3.3V - Supports >100 MHz bus toggle rates in high-speed data paths |
| Output Drive | ±24 mA at VCC = 3.0V - Drives standard TTL loads and 50 Ω transmission lines without buffers |
| I/O Voltage Tolerance | 0 V to 5.5 V - Allows direct interfacing with 5V peripherals without level-shifting components |
| Power-Down Behavior | High-impedance I/O when VCC < 1.5V - Eliminates bus glitches during hot-swap or brown-out conditions |
| ESD Rating | HBM ≥ 2000 V - Provides robust handling margin for assembly and field service environments |
Pinout & Package
74LCXZ245WM is housed in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide, with 1.27 mm pitch and gull-wing leads. Thermal and mechanical dimensions comply with Fairchild Package Number M20B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-Low Output Enable | Disables both A and B ports simultaneously into high-impedance state when HIGH |
| 2 (A0) | Side A I/O Terminal | Bidirectional data terminal for Bus A; direction controlled by T/R input |
| 3 (A1) | Side A I/O Terminal | Same as A0 - part of 8-bit A-side interface with shared T/R control |
| 19 (B7) | Side B I/O Terminal | Most significant bit of B-side bus; electrically identical to B0–B6 |
| 20 (T/R) | Direction Control Input | LOW = B→A data flow; HIGH = A→B data flow; no internal pull-up/pull-down |
Key Features
| Feature | Design Value |
|---|---|
| 5V-Tolerant I/O | Supports direct connection to 5V logic without external voltage translators or clamping diodes |
| Live Insertion Support | Guaranteed high-Z state during power-up/down prevents bus conflicts during hot-plug operations |
| Noise/EMI Reduction | Patented circuitry minimizes simultaneous switching noise on shared VCC/GND planes |
| Low ICC Quiescent Current | 225 µA max at VCC = 2.3–3.6V - reduces standby power in battery-backed systems |
Applications
| PCI Express Slot Interface | Memory Expansion Bridge |
|---|---|
Use Scenario: Interfacing 3.3V FPGA configuration logic to legacy 5V PCI add-in cards. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant transceiver managing address/data strobes across mixed-voltage domains. Use Value: Eliminates need for discrete level shifters while maintaining <7 ns propagation delay for timing-critical control signals. | Use Scenario: Extending DDR SDRAM bus from 2.5V SoC to 5V DIMM slots in industrial computing modules. IC Role / Device Role / Timing Role: Direction-controlled buffer isolating memory controller I/O from higher-voltage module side. Use Value: ±24 mA drive capability ensures signal integrity over 10 cm PCB traces without repeaters. |
| Hot-Swappable Backplane Module | Legacy Industrial Controller Bus |
Use Scenario: Enabling safe insertion/removal of 3.3V I/O modules into 5V backplane infrastructure. IC Role / Device Role / Timing Role: Bus isolation transceiver with automatic high-Z on power loss. Use Value: Power-down high-impedance behavior prevents bus contention during module insertion or removal. | Use Scenario: Connecting modern low-voltage microcontrollers to aging 5V RS-485 or CAN transceiver buses. IC Role / Device Role / Timing Role: Level-adapting interface for control/status lines in programmable logic controllers. Use Value: 5V-tolerant inputs accept legacy bus voltages while consuming <250 µA quiescent current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245A | Lower VCC range (1.65–3.6V); no guaranteed 5V tolerance - requires external clamping for 5V I/O | Suitable only in fully 3.3V or lower systems; not drop-in for 5V bus interfacing | Select when full 5V tolerance is unnecessary and cost is primary constraint |
| SN74AVC245 | Wider VCC range (1.2–3.6V); supports 5V-tolerant I/O but with lower drive (±12 mA at 3.3V) | Better for ultra-low-voltage designs; less suitable for driving long traces or heavy loads | Prefer for portable/embedded systems where supply headroom is limited and load is light |
Compared with 74LCXZ245WM, 74LVC245A lacks guaranteed 5V I/O tolerance and requires external protection, while SN74AVC245 offers broader VCC flexibility but reduced drive strength - making 74LCXZ245WM optimal for robust 5V-bus interfacing at 2.5V/3.3V VCC with high-current drive needs.
Availability
74LCXZ245WM is available at Aetrix Electronics and suitable for PCI Express slot interface, memory expansion bridge, and hot-swappable backplane module applications requiring stable component supply, long-term lifecycle support, and JEDEC-compliant SOIC packaging.
Supply support for 74LCXZ245WM 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 designer and manufacturer of analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The 74LCXZ245WM belongs to the LCX low-voltage CMOS logic family, engineered specifically for mixed-voltage bus interfacing with emphasis on 5V tolerance, low dynamic power, and robust hot-swap behavior in computing and communications equipment.
FAQ
What is the maximum operating temperature range for the 74LCXZ245WM?
The 74LCXZ245WM is rated for free-air operating temperatures from –40°C to +85°C. This range supports deployment in industrial control panels, telecom line cards, and embedded computing platforms exposed to ambient thermal variation. All DC and AC electrical specifications in the datasheet are guaranteed across this full temperature span, including propagation delay, output drive, and leakage current parameters.
Does the 74LCXZ245WM require external pull-up resistors on OE or T/R inputs?
The 74LCXZ245WM does not integrate internal pull-ups on OE or T/R; however, a pull-up resistor on OE is recommended during power-up to ensure predictable high-impedance startup. Per Fairchild Application Note AN-5003, a minimum 10 kΩ pull-up to VCC guarantees reliable power-on initialization. T/R may be driven directly from CMOS logic without biasing, as it has no default state.
Can the 74LCXZ245WM be used in place of the 74LCX245 without modification?
Yes - the 74LCXZ245WM replaces the 74LCX245 with enhanced functionality: identical pinout and logic behavior, plus added power-down high-impedance protection below 1.5V VCC. No PCB changes are required, and the Z-version improves system robustness during brown-out or hot-insertion events. Both share the same SOIC-20 (M20B) package and JEDEC MS-013 footprint.
What is the meaning of "Z" in the 74LCXZ245WM part number?
The "Z" in 74LCXZ245WM denotes the inclusion of zero-power-down (ZPD) functionality: when VCC drops below 1.5V, all I/O pins automatically enter a high-impedance state regardless of OE or T/R logic levels. This feature distinguishes it from the base 74LCX245 and prevents bus contention during power sequencing - a critical requirement in modular and hot-pluggable systems using the 74LCXZ245WM.
Is the 74LCXZ245WM RoHS compliant and lead-free?
Yes - the 74LCXZ245WM is Pb-Free and complies with JEDEC J-STD-020B reflow standards. Its SOIC package (M20B) uses matte tin lead finish and meets RoHS Directive 2011/65/EU requirements. Fairchild's original datasheet DS500362 explicitly states "Pb-Free package per JEDEC J-STD-020B", confirming full compliance for use in environmentally regulated electronics manufacturing.
74LCXZ245WM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCXZ
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74LCXZ245WM FAQ
1.How can I place an order for 74LCXZ245WM through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCXZ245WM 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 74LCXZ245WM reliable?
The price and inventory of 74LCXZ245WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXZ245WM is usually 5 days.
3.What payment methods are accepted for 74LCXZ245WM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXZ245WM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCXZ245WM?
74LCXZ245WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCXZ245WM 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 74LCXZ245WM?
For technical support, including 74LCXZ245WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXZ245WM requirements.
6.How does Aetrix verify that 74LCXZ245WM is sourced from the original manufacturer or authorized distributors?
All 74LCXZ245WM 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 74LCXZ245WM meets industry standards.
7.What is the process for return or replacement of 74LCXZ245WM?
All 74LCXZ245WM units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXZ245WM, 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 74LCXZ245WM part is unused and in its original packaging.
Return procedure for 74LCXZ245WM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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