SN74CB3Q3244RGYR

Overview

The SN74CB3Q3244RGYR is an 8-bit FET bus switch in a 20-pin VQFN package. It operates with a supply voltage (VCC) range of 2.3V to 3.6V and supports data I/O voltages from 0V to 5.5V. The device features bidirectional data flow with two separate output-enable inputs, allowing configuration as one 8-bit or two 4-bit switches. It provides high-bandwidth performance up to 500MHz with propagation delays as low as 0.12ns at 3.3V. The component includes Ioff circuitry for partial-power-down isolation and meets JESD 78 Class II latch-up standards.

Feature Summary

• Rail-to-rail switching capability supporting 0V to 5V signaling levels when powered by 3.3V
• Integrated charge pump architecture ensures low and flat ON-state resistance across the operating range
• Ioff circuitry prevents damaging current backflow during partial-power-down mode operations
• Data and control inputs feature undershoot clamp diodes to protect against signal anomalies

Applications

• Broadband communications systems requiring high-bandwidth data paths
• Memory interleaving and bus isolation in data-intensive computing environments
• Low-distortion signal gating for differential signal interfaces
• Networking equipment utilizing mixed-voltage logic level translation

Procurement Notes

Verify the specific ordering suffix 'RGYR' corresponds to the VQFN-20 package with a 3000-unit reel quantity. Confirm that the moisture sensitivity level (MSL) rating of Level-2 aligns with your assembly timeline requirements. Ensure the lead finish matches the NIPDAU specification for compatibility with your soldering process.

Selection Notes

Select this component when interfacing between 2.5V/3.3V logic domains and 5V peripherals without external level shifters. The bidirectional nature and separate enable pins offer flexibility for complex bus topologies. Consider the thermal resistance characteristics of the VQFN package if high ambient temperatures are expected in the application environment.

Part Context

This device belongs to the SN74CB3Q series of automotive-grade bus switches designed for low-voltage applications. It utilizes Texas Instruments' proprietary charge pump technology to maintain consistent switching performance. The RGYR suffix specifically denotes the plastic quad flat no-lead package variant optimized for surface-mount assembly.

Replacement Considerations

SN74CBT3244RGYR: Octal FET Bus Switch with similar pinout and functionality but different internal specifications.