SN74CBT6800CDGVR

Overview

The SN74CBT6800CDGVR is a 10-bit FET bus switch in a 24-pin TVSOP package. It operates within a VCC range of 4 V to 5.5 V and supports data I/O levels from 0 V to 5 V. The device features low ON-state resistance (ron) with typical values of 3 Ω at VCC = 4.5 V and 8 Ω at VCC = 4 V. Propagation delay (tpd) is typically 0.15 ns at VCC = 5 V. Control inputs accept TTL or 5-V/3.3-V CMOS logic, while the B port precharges to a user-selectable bias voltage (BIASV). Maximum supply current is 3 µA.

Feature Summary

• Active undershoot protection on A and B ports prevents false switching during signal glitches down to -2 V.
• B-port outputs are precharged via a bias voltage pin to minimize live-insertion noise and hot-plug distortion.
• Supports partial-power-down mode through Ioff isolation, preventing damaging backflow currents when powered off.
• Bidirectional data flow with near-zero propagation delay and low input/output capacitance for minimal loading.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'DGVR' corresponds to the TVSOP-24 package and tape-and-reel carrier format. Confirm that the component status remains active production rather than discontinued. Ensure the design accommodates the required BIASV connection for proper precharge functionality. Validate thermal management requirements against the specified package thermal impedance for the target operating environment.

Selection Notes

Select this component for high-speed digital buses requiring bidirectional switching with minimal signal degradation. The widebus family architecture allows compatibility with various signaling levels including 3.3-V and 5-V systems. Consider the single output-enable control input for simplified system integration. Evaluate the low power consumption characteristics for battery-operated or thermally constrained designs.

Part Context

This part belongs to the Texas Instruments Widebus family of high-speed FET bus switches. It shares functional similarities with other members like the SN74CBT6800CPWR but differs in physical packaging. The TVSOP form factor offers a compact solution for space-constrained printed circuit board layouts compared to standard SOIC packages.

Replacement Considerations

SN74CBT6800CDGVRE4 is an equivalent RoHS-compliant variant within the same package type.

FAQ

How does the device handle live insertion events?

The B port is precharged to a user-selectable bias voltage (BIASV), which minimizes live-insertion noise by ensuring glitches do not cross receiver input thresholds.

What is the function of the BIASV pin?

The BIASV pin provides a bias voltage to precharge the B port outputs, reducing signal distortion during hot-plugging and live insertion scenarios.