74LCXZ245MSA

Overview

The Fairchild Semiconductor 74LCXZ245MSA is a low-voltage bidirectional transceiver featuring eight non-inverting buffers with three-state outputs. It operates within a supply voltage range of 2.3V to 3.6V and provides 5V tolerant inputs and outputs, enabling direct interfacing with 5V signal environments. The device includes patented noise and EMI reduction circuitry to enhance signal integrity. It supports live insertion and withdrawal without damage. Key electrical specifications include a maximum propagation delay of 7.0 ns at 3.3V and a maximum quiescent current of 10 µA. The output drive capability is rated at ±24 mA at VCC = 3.0V.

Feature Summary

• Provides 5V tolerant inputs and outputs for seamless interface with 5V logic systems
• Implements patented noise and EMI reduction circuitry for improved signal quality
• Supports live insertion and withdrawal operations safely
• Features high impedance power-down state to minimize standby power consumption

Applications

• Bus-oriented applications in memory and microprocessor systems
• Bidirectional data bus communication between different voltage domains
• Low voltage (2.5V and 3.3V) system interconnects requiring 5V compatibility

Procurement Notes

Verify the specific manufacturer source, as this component was originally produced by Fairchild Semiconductor, which is now part of onsemi. Confirm that the datasheet revision and ordering suffix match the required specifications. Check for RoHS compliance status and lead-free packaging details relevant to your assembly process. Ensure the SOIC-20 package dimensions align with your PCB footprint requirements before finalizing procurement.

Selection Notes

Select this component when designing systems that require bidirectional data transfer between 3.3V or 2.5V buses and 5V peripherals. It is suitable for applications demanding low power consumption and high noise immunity. Consider the 7.0 ns propagation delay for timing-critical paths. Ensure the operating temperature range meets environmental conditions. This device is ideal for replacing older TTL or LS series transceivers in modern low-voltage designs.

Part Context

The 74LCXZ245MSA belongs to the LCX family of low-voltage CMOS logic devices. It is an octal bus transceiver designed for high-performance applications. The 'Z' suffix typically indicates lead-free and halogen-free construction. It shares functional similarities with other 74LCX245 variants but offers specific 5V tolerance features. The MS-20 package provides a compact surface-mount solution for space-constrained designs.

Replacement Considerations

Direct substitutes include MC74LCX245DT from onsemi/NXP and DM74ALS245AWMX from Fairchild (older ALS series). Verify pinout compatibility and electrical characteristics such as propagation delay and output drive strength. Ensure the replacement device supports the same voltage levels and 5V tolerance requirements.