SN74CBT6800CDBQRG4

Overview

The SN74CBT6800CDBQRG4 is a 10-bit FET bus switch from the Widebus family, manufactured by Texas Instruments. It operates within a VCC range of 4 V to 5.5 V and supports bidirectional data flow with near-zero propagation delay. The device features active undershoot protection on A and B ports up to -2 V and precharges the B port via a user-selectable bias voltage (BIASV) to minimize live-insertion noise. It includes Ioff support for partial-power-down mode, ensuring isolation during power off. The component is housed in a 24-pin TVSOP package.

Feature Summary

• Active undershoot-protection circuitry on A and B ports prevents signal glitches during insertion or removal events.
• B-port outputs are precharged to a user-selectable bias voltage to minimize signal distortion during live insertion and hot-plugging.
• Supports partial-power-down applications through Ioff feature, preventing damaging backflow current when powered down.
• Low ON-state resistance and low input/output capacitance minimize loading and signal distortion.

Applications

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

Procurement Notes

Verify the exact part number against the manufacturer's official ordering information to ensure correct package type and environmental compliance. Confirm that the G4 suffix aligns with RoHS3 specifications as documented in the product addendum. Cross-reference the datasheet revision date to validate technical parameters before integration into design files.

Selection Notes

Select this component for high-speed digital and analog applications requiring minimal signal degradation. Ensure the control inputs are driven by TTL or 5-V/3.3-V CMOS outputs. Verify that the system operating temperature falls within the specified -40°C to 85°C range and that the supply voltage remains between 4 V and 5.5 V.

Part Context

This device belongs to the SN74CBT6800 series, designed as a high-speed TTL-compatible FET bus switch. It is part of Texas Instruments' Widebus family, which emphasizes low distortion and high bandwidth. The specific DBQRG4 designation indicates a tape-and-reel packaging format in a TVSOP-24 housing, suitable for surface-mount assembly.

Replacement Considerations

SN74CBT6800CDGVR

FAQ

How does the device handle live insertion?

The B port is precharged to a user-selectable bias voltage (BIASV), which minimizes live-insertion noise by ensuring glitches do not cross the input threshold region of receivers on the active bus.

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 partial-power-down mode operation.