SN74CB3Q3244DBQR

Overview

The SN74CB3Q3244DBQR is an 8-bit FET bus switch from the SN74CB3Q series, manufactured by Texas Instruments. It operates within a supply voltage range of 2.3V to 3.6V and supports bidirectional data flow with near-zero propagation delay. The device features high-bandwidth data paths up to 500MHz and low ON-state resistance characteristics. It includes Ioff circuitry for partial-power-down mode operation and provides 5V-tolerant I/Os. The component is housed in a 20-pin SSOP package.

Feature Summary

• High-bandwidth data path supporting up to 500MHz
• Rail-to-rail switching capability on data ports
• Integrated Ioff circuitry for partial-power-down isolation
• Low input and output capacitance to minimize signal distortion

Applications

• Differential signal interface
• Memory interleaving
• Bus isolation
• Low-distortion signal gating

Procurement Notes

Verify the specific ordering suffix 'DBQR' corresponds to the SSOP-20 package variant when sourcing. Confirm RoHS compliance status and lead finish details via the manufacturer's official documentation. Ensure ESD handling precautions are observed during assembly due to the sensitivity of the CMOS inputs.

Selection Notes

Select this component for applications requiring high-speed data transfer between different voltage domains. The 5V-tolerant inputs allow compatibility with legacy systems while operating at lower core voltages. Consider the thermal resistance metrics if deploying in densely packed PCB layouts without adequate airflow.

Part Context

This part belongs to the SN74CB3Q family of high-bandwidth bus switches designed for broadband communications and data-intensive computing. The CB3Q series utilizes charge pump technology to maintain flat ON-state resistance across the operating range, ensuring consistent signal integrity for digital and analog signals.

Replacement Considerations

SN74CB3Q3244DBQ

FAQ

How does the device handle powered-down states?

The device incorporates Ioff circuitry that prevents damaging current backflow through the I/O ports when VCC is zero, allowing safe partial-power-down mode operation.

What is the maximum switching frequency for the control input?

The maximum switching frequency for the OE control input is specified as 20 MHz under recommended operating conditions.