SN74CBT6800CPWR

Overview

The SN74CBT6800CPWR is a 10-bit FET bus switch from the Widebus family, designed for high-speed bidirectional data flow with near-zero propagation delay. It operates within a VCC range of 4 V to 5.5 V and supports data I/O signaling levels from 0 V to 5 V. The device features low ON-state resistance (ron) characteristics and includes active undershoot protection on A and B ports up to −2 V. It incorporates an Ioff feature for partial-power-down isolation and precharges the B port via a user-selectable bias voltage (BIASV) to minimize live-insertion noise.

Feature Summary

• Active undershoot-protection circuitry ensures proper OFF state during signal glitches down to −2 V.
• B-port outputs are precharged by a user-selectable bias voltage (BIASV) to minimize signal distortion during live insertion and hot-plugging.
• Ioff feature provides isolation during power-off to prevent damaging backflow current in partial-power-down applications.
• Data and control inputs include undershoot clamp diodes to protect against voltage excursions below ground.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'PW' corresponds to the TSSOP-24 package configuration required for your PCB layout. Confirm that the component status is listed as Active in the manufacturer's latest product availability documentation before finalizing procurement plans. Ensure compatibility with the specified operating temperature range of −40°C to +85°C for your intended environment.

Selection Notes

Select this component when designing systems requiring wide-voltage tolerance and robust protection against undershoot events. The single output-enable input simplifies control logic compared to multi-channel switches. Consider the BIASV pin functionality if minimizing insertion noise is critical for your application's signal integrity requirements.

Part Context

This device belongs to Texas Instruments' Widebus family of high-speed TTL-compatible FET bus switches. It shares functional similarities with other members like the SN74CBT6800CDW but differs in its physical packaging. The PW suffix specifically denotes the Thin Shrink Small Outline Package (TSSOP), which offers a compact footprint suitable for space-constrained designs.

Replacement Considerations

SN74CBT6800CDW is a direct functional equivalent housed in a SOIC-24 package. SN74CBT6800CPWRG4 is a lead-free variant of the same TSSOP package. Verify pinout compatibility and thermal performance differences between packages before substituting.