SN74CBT3383CPWR

Overview

The SN74CBT3383CPWR is a high-speed TTL-compatible FET bus-exchange switch featuring ten bits. It operates within a VCC range of 4 V to 5.5 V, supporting data I/O signaling levels from 0 V to 5 V. The device provides active undershoot protection up to -2 V on A and B ports. Key electrical parameters include a typical ON-state resistance (ron) of 3 Ω at VCC=4.5V, maximum propagation delay (tpd) of 0.24 ns at VCC=4V, and maximum supply current (ICC) of 3 mA. ESD ratings are ±3000 V for the human-body model and ±1000 V for the charged-device model.

Feature Summary

• Active undershoot-protection circuitry ensures proper OFF state during negative voltage events up to -2 V.
• Bus-exchange functionality enables bidirectional data flow with nibble swapping between signal ports.
• Low input-output capacitance minimizes loading effects and signal distortion.
• Supports partial-power-down mode operation via the Ioff feature to prevent backflow currents.

Applications

• PCI interface systems
• Memory interleaving circuits
• Bus isolation applications

Procurement Notes

Verify the specific package type against the orderable addendum, as the SN74CBT3383C series includes SSOP, SOIC, and TSSOP options. Confirm that the CPWR suffix corresponds to the TSSOP-24 package variant. Ensure compatibility with the required operating temperature range of -40°C to +85°C. Check for any documentation updates or revision history changes prior to finalizing procurement specifications.

Selection Notes

Select this component when low propagation delay and near-zero switching latency are critical for system performance. The bus-exchange capability makes it suitable for byte-swapping operations in multiplexing configurations. Verify that control inputs can be driven by TTL or 5-V/3.3-V CMOS outputs to ensure logic level compatibility across different voltage domains.

Part Context

This device belongs to the Texas Instruments SN74CBT3383C family of 10-bit FET bus switches. It is designed for high-speed digital and analog applications requiring minimal signal degradation. The part integrates features such as latch-up protection exceeding 100 mA per JESD 78 standards and robust electrostatic discharge tolerance.

Replacement Considerations

Consult the manufacturer's product folder for direct substitutes. Cross-reference pinouts and electrical characteristics carefully if considering alternative bus-switch ICs from other manufacturers.

FAQ

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

When BE is low, setting BX high connects port A1 to B2 and A2 to B1, enabling nibble swapping. Setting BX low connects A1 to B1 and A2 to B2.

What is the purpose of the Ioff feature?

The Ioff feature ensures that damaging current does not backflow through the device when it is powered down, supporting partial-power-down mode operation.