SN74CBT3384CPW

Overview

The SN74CBT3384CPW is a high-speed TTL-compatible FET bus switch housed in a 24-pin TSSOP package. It operates within a supply voltage range of 4 V to 5.5 V and supports data I/O levels from 0 V to 5 V. The device features two independent 5-bit bus switches, providing a total of 10 bits. Key electrical parameters include a maximum propagation delay of 0.24 ns at 4 V and 0.15 ns at 5 V, an ON-state resistance (ron) ranging from 3 Ω to 12 Ω depending on conditions, and a typical off-isolation input/output capacitance of 5 pF.

Feature Summary

• Active undershoot protection circuitry on A and B ports ensures proper OFF state during undershoot events up to -2 V.
• Supports partial-power-down mode operation via the Ioff feature to prevent damaging backflow current when powered down.
• Bidirectional data flow capability with near-zero propagation delay characteristics.

Applications

• PCI interface applications
• Memory interleaving systems
• Bus isolation circuits
• Low-distortion signal gating

Procurement Notes

Verify that the specific part number matches the required TSSOP-24 tube packaging configuration. Confirm RoHS compliance status and lead finish specifications against the latest Texas Instruments ordering information. Ensure control inputs are tied to VCC or GND to maintain proper device operation and avoid floating input issues.

Selection Notes

Select this component for designs requiring bidirectional switching between 4-V and 5.5-V domains. The low ON-state resistance and minimal capacitance make it suitable for high-speed digital buses. Verify that the operating temperature range of -40°C to 85°C aligns with the system environmental requirements.

Part Context

This device belongs to the SN74CBT3384C series of high-speed FET bus switches manufactured by Texas Instruments. It is designed to replace older logic families in modern high-density PCB layouts where signal integrity and speed are critical constraints.

Replacement Considerations

SN74CBT3384CDWR

FAQ

How does the device handle undershoot events?

The SN74CBT3384CPW includes 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 correct OFF state.

What is the function of the Ioff feature?

The Ioff feature allows the device to be fully specified for partial-power-down applications, ensuring that no damaging current backflows through the device when it is powered down.