FSTUD16450MTD

Overview

The FSTUD16450MTD is a configurable bus switch in a 56-lead TSSOP package. It supports 4-bit, 5-bit, 8-bit, 10-bit, 16-bit, and 20-bit configurations via select pins. Operating voltage ranges from 4.0V to 5.5V with an operating temperature of -40°C to +85°C. The device features undershoot hardened ports supporting voltages down to -2.0V. On-resistance is typically 4Ω at 5V supply. Propagation delay is 0.25ns. Quiescent current is 3µA when level shifting is disabled.

Feature Summary

• Configurable bit width selection for flexible system integration
• Undershoot hardened I/O ports protecting against negative voltage transients
• Selectable level shifting capability between 5V inputs and 3.3V outputs
• Low on-resistance enabling high-speed signal transmission

Applications

• High-speed CMOS TTL-compatible bus switching
• Level shifting between 5V and 3.3V logic domains
• Data bus isolation and routing in digital systems

Procurement Notes

Verify component authenticity through authorized distributors. Confirm the MTD56 package marking matches the datasheet specifications. Check RoHS compliance documentation as required by project standards. Ensure static discharge precautions are followed during handling due to CMOS sensitivity.

Selection Notes

Select this component when variable bus widths are required without additional control logic. The integrated level shifting feature simplifies interfacing mixed-voltage systems. Verify that the -2V undershoot protection meets the specific noise immunity requirements of the target application environment.

Part Context

This part belongs to the Fairchild Universal Bus Switch family, now manufactured by onsemi. It utilizes Undershoot Hardened Circuit (UHC) technology. The device replaces older discrete switching solutions by integrating multiple configurable channels into a single compact surface-mount package.

Replacement Considerations

Check for equivalent bus switches with similar pin counts and undershoot protection. Verify if alternative packages like FBGA are available for space-constrained designs. Ensure control logic compatibility with existing select pin configurations.