SN74CBT3384CDBR

Overview

The SN74CBT3384CDBR is a high-speed TTL-compatible FET bus switch manufactured by Texas Instruments. It features two independent 5-bit bus switches housed in a 24-pin SSOP package. The device operates within a supply voltage range of 4 V to 5.5 V and supports bidirectional data flow with near-zero propagation delay. Key electrical parameters include a maximum on-state resistance of 12 Ω, a typical input/output capacitance of 5 pF, and a maximum power supply current of 3 µA. It provides active undershoot protection up to -2 V and supports partial-power-down mode via the Ioff feature.

Feature Summary

• Active undershoot-protection circuitry ensures proper OFF state during signal events down to -2 V
• Supports partial-power-down operation to prevent damaging backflow currents when powered off
• Low ON-state resistance minimizes propagation delay for high-speed data transfer
• Control inputs are compatible with TTL or 5-V/3.3-V CMOS outputs

Applications

• PCI interface bus isolation
• Memory interleaving
• Low-distortion signal gating

Procurement Notes

Verify that the specific orderable part number matches the required SSOP-24 package configuration. Confirm the operating temperature range requirements align with the specified -40°C to +85°C industrial limits. Ensure control inputs are properly biased to VCC or GND to maintain the high-impedance state during power-up or power-down sequences.

Selection Notes

Select this component when designing systems requiring low-capacitance switching for signal integrity preservation. The dual 5-bit architecture allows flexible configuration as either two separate 5-bit switches or one combined 10-bit switch. Verify that the application voltage levels fall within the supported 0 V to 5.5 V data I/O range.

Part Context

This device belongs to the SN74CBT3384C series of high-speed FET bus switches. It is designed to replace mechanical relays or slower logic gates in digital and analog applications where minimal signal distortion and fast switching speeds are critical. The SSOP-24 package provides a compact footprint suitable for dense printed circuit board layouts.

Replacement Considerations

SN74CBT3384CDWR (SOIC-24)

FAQ

How does the device handle undershoot events?

The SN74CBT3384C 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 ensures that damaging current will not backflow through the device when it is powered down, providing isolation during power-off conditions.