74CB3Q3244DBQRE4

Overview

The SN74CB3Q3244 is an automotive-grade, high-bandwidth FET bus switch designed for 2.5V to 3.3V low-voltage applications. It features a charge pump that elevates the gate voltage of pass transistors to provide low and flat ON-state resistance (ron), enabling minimal propagation delay and rail-to-rail switching on data I/O ports. The device supports bidirectional data flow with near-zero propagation delay and includes undershoot clamp diodes on data and control inputs. It operates within a VCC range of 2.3V to 3.6V and supports data I/O signaling levels from 0V to 5V.

Feature Summary

• High-bandwidth data path supporting up to 500MHz
• 5V-tolerant I/Os compatible with powered-up or powered-down states
• Low and flat ON-state resistance characteristics over the operating range
• Rail-to-rail switching capability on data I/O ports

Applications

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

Procurement Notes

Verify the specific package suffix (e.g., DBQR, PWR) against the orderable part number addendum to ensure correct physical dimensions and moisture sensitivity level. Confirm RoHS compliance and lead finish specifications match assembly requirements. Ensure ESD handling protocols are followed during manufacturing due to the component's sensitivity ratings.

Selection Notes

Select this component when designing broadband communications, networking, or data-intensive computing systems requiring optimized interfaces. It is suitable for both digital and analog applications where low capacitive loading and signal distortion must be minimized. Verify that the control input voltage levels align with available TTL or CMOS drivers.

Part Context

This device belongs to the SN74CB3Q series, which represents Texas Instruments' automotive-qualified logic family. It utilizes a specialized FET architecture distinct from standard bipolar logic gates. The Q-series designation indicates qualification for automotive environments, ensuring reliability under varying thermal and electrical conditions typical in vehicle electronics.

Replacement Considerations

SN74CB3Q3244DBQRE4

FAQ

How does the device handle partial-power-down scenarios?

The device features dedicated Ioff circuitry that prevents damaging current backflow through the component when it is powered down while the system remains active.

What is the maximum switching frequency supported by the control inputs?

The maximum switching frequency for the control input (OE) is specified as 10 MHz to 20 MHz depending on the supply voltage.