SN74CBT3306DR

Overview

The SN74CBT3306DR is a dual FET bus switch manufactured by Texas Instruments, housed in an 8-pin SOIC package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports data I/O levels from 0 V to 5.5 V. The device features two independent 1:1 switches with separate output enable inputs. Key electrical characteristics include a maximum on-resistance of 12 ohms and a maximum propagation delay of 150 ps. It functions reliably across an operating temperature range of -40 °C to +85 °C.

Feature Summary

• Integrates active undershoot protection circuitry to maintain correct off-state during signal events down to -2 V.
• Supports bidirectional data flow with near-zero propagation delay for high-speed transmission.
• Enables partial power-down mode operation to prevent reverse current when the device is de-energized.

Applications

• High-speed data routing in digital systems
• Level shifting between different logic families
• Bus holding applications requiring low capacitance

Procurement Notes

Verify the specific suffix against official documentation to confirm package type and tape-and-reel specifications. Ensure the ordering part number matches the required RoHS compliance status and manufacturing revision. Cross-reference the manufacturer's latest datasheet to validate pinout compatibility and absolute maximum ratings before integration into the design.

Selection Notes

Select this component for designs requiring low on-resistance and fast switching speeds within a 5 V logic environment. The SOIC-8 package offers a compact footprint suitable for surface-mount assembly. Consider the separate enable inputs for flexible control of individual channels in multi-bus architectures.

Part Context

This device belongs to the Texas Instruments CBT series of bus switches. It is designed as a TTL-compatible solution for connecting buses where low impedance and minimal signal distortion are critical. The dual-channel configuration allows for efficient management of two distinct signal paths within a single integrated circuit.

Replacement Considerations

SN74CBTD3306CDR

FAQ

Does the SN74CBT3306DR support bidirectional data transfer?

Yes, the internal FET structure allows for bidirectional data flow between the A and B ports.

What is the purpose of the undershoot protection feature?

The active undershoot protection ensures the switch remains in the correct off-state if the input signal dips below ground potential, specifically protecting against undershoot events down to -2 V.