SN74CBTLV16800GR

Overview

The SN74CBTLV16800GR is a low-voltage 20-bit FET bus switch manufactured by Texas Instruments in the TSSOP-48 package. It operates within a supply voltage range of 2.3 V to 3.6 V and an ambient temperature range of -40°C to 85°C. The device features a typical on-state resistance (ron) of 5 Ω at VCC = 3 V and 3.3 V, with maximum values up to 9 Ω under specific load conditions. Propagation delay (tpd) ranges from 0.15 ns to 0.25 ns depending on the supply voltage. Input leakage current (Ioff) is limited to 10 μA when VCC = 0 V.

Feature Summary

• Provides 20 bits of high-speed bus switching organized as dual 10-bit switches with separate output-enable inputs.
• Features precharged B-port outputs via a user-selectable bias voltage to minimize signal distortion during live insertion.
• Supports partial-power-down mode operation through Ioff functionality to prevent damaging backflow currents.
• Offers rail-to-rail switching capability on data I/O ports with low on-state resistance for minimal propagation delay.

Applications

• High-speed bus switching applications requiring low latency
• Partial-power-down systems requiring isolation during power-off states
• Live-insertion environments needing minimized signal distortion

Procurement Notes

Verify the exact ordering suffix 'GR' corresponds to the TSSOP (DGG) package with tape-and-reel packaging containing 2000 units per reel. Confirm that the RoHS status is compliant and the moisture sensitivity level is rated Level-1. Ensure the operating temperature range meets the application's environmental requirements of -40°C to 85°C.

Selection Notes

Select this component when a 20-bit widebus solution is required with independent control over two 10-bit segments. Consider the precharged output feature if the design involves hot-swapping or live insertion scenarios where signal integrity is critical. Verify that the 2.3 V to 3.6 V supply range aligns with the system's power rails and that the 5 Ω on-resistance satisfies the voltage drop constraints.

Part Context

This part belongs to the SN74CBTLV16800 family, which is part of Texas Instruments' Widebus family. The 'GR' suffix specifically denotes the TSSOP package variant. Other variants in the family include DL (SSOP), DGV (TVSOP), and their respective tape-and-reel versions like DLR and VR.

Replacement Considerations

Direct substitutes include other SN74CBTLV16800 variants such as SN74CBTLV16800DLR (SSOP package) or SN74CBTLV16800VR (TVSOP package). These share identical electrical characteristics but differ in physical package dimensions and pinout compatibility.

FAQ

How does the BIASV pin function?

The BIASV pin allows users to precharge the B port outputs to a specific voltage level. This feature minimizes signal distortion and noise during live insertion events when the switch is in the high-impedance state.

What is the purpose of the Ioff feature?

The Ioff feature ensures that no more than 10 μA of current flows through the device when it is powered down (VCC = 0 V). This prevents damaging backflow currents into the powered-down supply rail, supporting partial-power-down applications.