SN74CB3Q3245PWR

Overview

The SN74CB3Q3245PWR is an 8-bit FET bus switch from Texas Instruments, packaged in a 20-pin TSSOP. It operates on a single supply voltage ranging from 2.3V to 3.6V and features bidirectional data flow with near-zero propagation delay (typical 0.12ns at 3.3V). The device utilizes a charge pump to maintain low and flat ON-state resistance (typical 4Ω) across the operating range. Data I/O ports support rail-to-rail switching up to 5V while powered by lower voltages. It includes built-in undershoot clamp diodes for control inputs and supports partial-power-down modes via Ioff circuitry.

Feature Summary

• High-bandwidth data path supporting frequencies up to 500MHz
• Low and flat ON-state resistance characteristics over the full operating temperature range
• Bidirectional data flow capability with minimal propagation delay
• Integrated Ioff circuitry enabling safe partial-power-down mode operation

Applications

• PCI interface systems
• Differential signal interfaces
• Memory interleaving applications
• Bus isolation circuits
• Broadband communications and networking equipment

Procurement Notes

Verify that the specific orderable part number matches the required package type and reel quantity. Confirm the moisture sensitivity level and peak reflow temperature ratings align with your assembly process capabilities. Ensure all unused control inputs are properly terminated to VCC or GND during operation to prevent undefined states. Check for any recent documentation updates regarding pinout or electrical characteristics before finalizing procurement.

Selection Notes

Select this component when designing systems requiring high-speed data transfer between buses operating at different voltage levels within the 2.3V to 3.6V range. It is suitable for applications demanding low capacitive loading to minimize signal distortion. Consider the TSSOP-20 package constraints regarding board space and thermal dissipation requirements compared to other available packages like VQFN or TVSOP.

Part Context

This device belongs to the SN74CB3Q3245 family of 8-bit FET bus switches designed for high-bandwidth applications. The 'PWR' suffix specifically denotes the TSSOP-20 package variant supplied in a tape and reel format. It is functionally equivalent to the IDTQS3VH384 device, providing a drop-in replacement option for designs originally utilizing that component.

Replacement Considerations

The datasheet explicitly states the device is equivalent to the IDTQS3VH384.