FST3245MTC

Overview

The FST3245MTCX is an 8-bit bus switch manufactured by onsemi, formerly Fairchild Semiconductor. It provides high-speed CMOS TTL-compatible switching in a standard '245 pin-out configuration housed in a 20-lead Thin Shrink Small Outline Package (TSSOP). The device operates within a supply voltage range of 4.0 V to 5.5 V and supports an operating temperature range from -40°C to +85°C. Key electrical characteristics include a typical on-resistance of 4 Ω at 4.5 V and minimal propagation delay.

Feature Summary

• Provides eight-bits of high-speed CMOS bus switching with a low on-resistance connection between ports.
• Features minimal propagation delay through the switch without adding ground bounce noise.
• Control inputs are compatible with TTL levels for straightforward integration.

Applications

• High-speed data bus switching applications
• Portable systems requiring low power consumption
• Consumer electronics utilizing standard '245 pin-outs

Procurement Notes

Verify the specific ordering suffix, such as 'X' for tape and reel packaging, against current official documentation. Confirm that the package type matches the required 20-lead TSSOP form factor. Ensure the operating temperature range aligns with system requirements. Check for any updates regarding part number nomenclature changes due to manufacturer integration processes.

Selection Notes

Select this component when an 8-bit bidirectional bus switch with standard '245 pin-out compatibility is required. Consider the 4 Ω on-resistance and low quiescent current for efficiency. Verify that the 4.0 V to 5.5 V supply voltage range meets the system's power specifications. Ensure the TSSOP package fits the available board space.

Part Context

The FST3245 series belongs to the Fast Switch Technology (FST) family, designed for high-speed data transfer. This specific model integrates eight bits of switching capability into a compact surface-mount package. It serves as a direct replacement for legacy devices using the standard '245 pin-out while offering improved performance metrics.

Replacement Considerations

Check for updated part numbers resulting from the Fairchild Semiconductor integration into ON Semiconductor. Verify pinout compatibility if substituting with other 8-bit bus switches. Ensure the replacement device supports the same 4.0 V to 5.5 V operating voltage range.

FAQ

What is the function of the /OE pin?

The /OE (Output Enable) pin controls the switch state. When LOW, Port A connects to Port B; when HIGH, the ports are disconnected in a high-impedance state.

Does the FST3245 generate ground bounce noise?

No, the low on-resistance allows inputs to connect to outputs without generating additional ground bounce noise.