SN74CB3Q3244DGVR

Overview

The SN74CB3Q3244DGVR is an 8-bit FET bus switch from Texas Instruments, organized as two independent 4-bit switches with separate output-enable inputs. It operates within a VCC range of 2.3V to 3.6V and supports data I/O voltages up to 5.5V. The device features high-bandwidth data paths up to 500MHz, low ON-state resistance (ron) ranging from 4Ω to 9Ω depending on conditions, and propagation delays between 0.12ns and 2ns. It includes Ioff circuitry for partial-power-down isolation and ESD protection rated at ±2000V (HBM) and ±1000V (CDM).

Feature Summary

• High-bandwidth switching capability supporting broadband communications and data-intensive computing.
• Rail-to-rail switching performance across the full operating voltage range.
• Integrated Ioff circuitry prevents damaging backflow current during partial-power-down states.
• Robust electrostatic discharge protection exceeding standard automotive reliability requirements.

Applications

• Differential signal interface routing
• Memory interleaving systems
• Bus isolation in networking equipment

Procurement Notes

Verify the specific ordering suffix 'DGVR' corresponds to the TVSOP-20 package and tape-and-reel carrier configuration. Confirm that the RoHS compliance status and lead finish match the project requirements. Ensure the moisture sensitivity level rating aligns with the assembly floor's storage and reflow constraints.

Selection Notes

Select this component when designing interfaces requiring bidirectional data flow with minimal signal distortion. The charge pump mechanism ensures flat ON-state resistance, making it suitable for maintaining signal integrity across varying load conditions. Verify control input compatibility with the system's logic voltage levels.

Part Context

This device belongs to the SN74CB3Q series of automotive-grade digital bus switches. It utilizes a charge pump to elevate gate voltage, optimizing the pass transistor characteristics for low-loss switching. The family is designed to replace mechanical relays or older CMOS switches in high-speed applications.

Replacement Considerations

SN74CB3Q3244DBQR

FAQ

How does the device handle power-down states?

The integrated Ioff circuitry automatically disconnects the I/O ports when VCC is powered down, preventing backflow current through the device.

What is the maximum switching frequency supported?

The device supports a maximum switching frequency for the control input of up to 20 MHz.