SN74CBT3383CDW

Overview

The SN74CBT3383CDW is a 10-bit FET bus-exchange switch manufactured by Texas Instruments. It operates within a supply voltage range of 4 V to 5.5 V and supports data I/O signaling levels from 0 V to 5 V, including 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V standards. The device features low on-state resistance (ron) with typical values of 3 Ω at 4.5 V and maximums up to 12 Ω depending on conditions. Propagation delay is minimal, typically 0.15 ns at 5 V. It includes active undershoot protection for off-isolation on A and B ports up to −2 V. The component is housed in a 24-pin SOIC package.

Feature Summary

• Bidirectional data flow capability with near-zero propagation delay for high-speed signal transmission.
• Bus-exchange functionality allowing nibble swapping between signal ports via the BX input pin.
• Active undershoot-protection circuitry ensuring proper OFF state during undershoot events up to −2 V.
• Supports partial-power-down mode operation through the Ioff feature to prevent backflow current.

Applications

• Enterprise servers
• Ethernet switches
• Routers

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official Package Option Addendum to confirm the exact physical package type and shipping carrier configuration. Ensure that the selected variant matches the required thermal performance and moisture sensitivity level ratings for the intended manufacturing process. Confirm RoHS compliance status and lead finish specifications prior to final procurement decisions.

Selection Notes

Select this component when designing systems requiring high-speed bus exchange or multiplexing capabilities with minimal signal distortion. The device is suitable for applications needing TTL-compatible control inputs and support for multiple voltage domains. Consider the thermal impedance characteristics of the SOIC package relative to the expected ambient operating temperature range and power dissipation requirements.

Part Context

This part belongs to the SN74CBT3383C series of high-speed CMOS TTL-compatible bus switches. It is designed to provide low ON-state resistance and low input/output capacitance to minimize loading effects. The series supports both digital and analog applications, offering robust latch-up performance exceeding 100 mA per JESD 78, Class II standards.

Replacement Considerations

SN74CBT3383CDWR

FAQ

How does the Bus Exchange (BX) pin affect data routing?

When the BE pin is low, the BX pin controls the data path. If BX is low, port A1 connects to port B1 and A2 to B2. If BX is high, port A1 connects to port B2 and A2 to B1, enabling byte swapping.

What is the purpose 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 states for partial-power-down applications.