SN74CBTD3384CDW

Overview

The SN74CBTD3384CDW is a high-speed TTL-compatible FET bus switch manufactured by Texas Instruments. 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 V. The device features low ON-state resistance with a typical value of 3 Ω and low input/output capacitance of 5 pF in the OFF state. It includes active undershoot protection up to -2 V on A and B ports and an integrated diode for level shifting from 5-V inputs down to 3.3-V outputs. The component is housed in a 24-pin SOIC (DW) package.

Feature Summary

• Bidirectional data flow with near-zero propagation delay
• Integrated diode provides 5-V input to 3.3-V output level shifting
• Active undershoot protection ensures proper OFF state during signal anomalies
• Supports partial-power-down mode via Ioff feature

Applications

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

Procurement Notes

Verify the specific ordering suffix 'DW' corresponds to the SOIC-24 tube packaging configuration. Confirm RoHS compliance status and lead finish details against the latest TI Package Option Addendum. Ensure design compatibility with the specified operating temperature range of -40°C to 85°C.

Selection Notes

Select this component when bidirectional switching between 5-V and 3.3-V domains is required without external level shifters. The low ON-resistance minimizes signal degradation, while the integrated protection circuits simplify board layout by reducing the need for external clamping components.

Part Context

This part belongs to the SN74CBTD3384C series of digital bus switches. It is designed for high-speed applications requiring minimal signal distortion. The device integrates two independent 5-bit bus switches, offering flexible configuration as either two 5-bit switches or one 10-bit switch depending on control input usage.

Replacement Considerations

SN74CBTD3384CDWR

FAQ

How does the device handle undershoot events?

The SN74CBTD3384C features active undershoot-protection circuitry on the A and B ports that senses undershoot events up to -2 V and ensures the switch remains in the proper OFF state.

What is the function of the integrated diode?

The integrated diode in series with VCC allows the device to perform level shifting, enabling 5-V input signals to be correctly interpreted as 3.3-V output levels.