SN74CB3Q3345DGVR

Overview

The SN74CB3Q3345DGVR is an octal bus switch manufactured by Texas Instruments, featuring a single 8-bit configuration within a 20-pin TVSOP package. It operates on a supply voltage range of 2.3 V to 3.6 V and supports bidirectional data transfer between ports A and B. The device incorporates a charge pump to maintain low and flat on-resistance across the full voltage range, enabling rail-to-rail switching. Key electrical parameters include a maximum propagation delay of 0.2 ns, a typical on-resistance of 4 ohms, and an input/output capacitance of 4 pF in the off state. It provides 5-V tolerant I/Os and includes ESD protection rated at 2 kV HBM.

Feature Summary

• Features a charge pump mechanism that ensures low and flat on-resistance for effective rail-to-rail signal switching.
• Provides 5-V tolerant inputs and outputs, allowing compatibility with various logic families regardless of power state.
• Supports partial power-down mode via dedicated Ioff circuitry to prevent current backflow during device deactivation.
• Delivers high bandwidth up to 500 MHz with minimal propagation delay for high-speed data transmission.

Applications

• High-bandwidth communication systems requiring fast signal routing
• Network infrastructure equipment utilizing dense data buses
• Data-intensive computing systems needing low-distortion signal paths

Procurement Notes

Verify the specific suffix 'DGVR' corresponds to the TVSOP-20 package and tape-and-reel orientation as documented in the manufacturer's official ordering information. Confirm RoHS compliance status and ensure the component matches the exact pinout and electrical specifications required for the target design before finalizing procurement.

Selection Notes

Select this component when designing circuits that require an 8-bit wide bus interface operating between 2.3 V and 3.6 V. It is suitable for applications demanding low insertion loss and high-speed data integrity. Ensure the system architecture can accommodate the 20-pin TVSOP footprint and that the control logic aligns with the active-low enable requirements specified in the datasheet.

Part Context

This part belongs to the SN74CB3Q series of automotive-grade bus switches from Texas Instruments. The CB3Q family is designed for robust performance in demanding environments, offering enhanced reliability compared to standard commercial logic. It serves as a critical interconnect solution for managing multiple data lines in complex electronic architectures where signal fidelity and speed are paramount.

Replacement Considerations

Direct substitutes within the same family include SN74CB3Q3345RGYR (VQFN-20 package) or SN74CB3T3245 variants for similar functionality in different packages. Verify pin compatibility and electrical tolerances before swapping.