SN74CB3Q3244PWR

Overview

The SN74CB3Q3244PWR is an 8-bit FET bus switch manufactured by Texas Instruments, housed in a TSSOP-20 package. It operates within a supply voltage range of 2.3V to 3.6V and supports data I/O voltages from 0V to 5.5V. The device features high-bandwidth data paths up to 500MHz with near-zero propagation delay (typical 0.12ns). It includes dedicated Ioff circuitry for partial-power-down mode isolation and provides undershoot clamp diodes on data and control inputs.

Feature Summary

• High-bandwidth data path supporting frequencies up to 500MHz
• Rail-to-rail switching capability across the full input/output voltage range
• Integrated Ioff circuitry enabling safe partial-power-down operation
• Low and flat ON-state resistance characteristics over the operating temperature range

Applications

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

Procurement Notes

Verify that the specific orderable part number matches the required TSSOP-20 package configuration. Confirm the moisture sensitivity level and reflow temperature profile requirements against your assembly process specifications. Ensure all unused control inputs are properly terminated to VCC or GND during operation to maintain device stability.

Selection Notes

Select this component when designing broadband communications or data-intensive computing systems requiring low capacitive loading. The charge pump mechanism ensures minimal signal distortion compared to standard switches. Verify that the system's control logic levels are compatible with the specified VIH and VIL thresholds for reliable switching performance.

Part Context

This device belongs to the SN74CB3Q series of low-voltage, high-bandwidth bus switches. It utilizes a charge pump to elevate gate voltage, providing superior ON-state resistance compared to conventional CMOS switches. The architecture allows the IC to function as two independent 4-bit switches or a single 8-bit switch.

Replacement Considerations

SN74CB3Q3244PW

FAQ

How does the device handle power-down conditions?

The integrated Ioff circuitry prevents damaging current backflow through the device when powered down, ensuring complete isolation between ports.

What is the maximum switching frequency supported?

The device supports a maximum switching frequency for the control input of up to 500MHz.