74CB3Q3245RGYRG4

Overview

The SN74CB3Q3245RGYRG4 is an 8-bit FET bus switch from Texas Instruments, housed in a 20-pin VQFN package. It operates within a supply voltage range of 2.3V to 3.6V and supports data I/O voltages up to 5.5V. The device features a high-bandwidth data path with a typical ON-state resistance (ron) of 4Ω and low input/output capacitance of 3.5pF. It provides bidirectional data flow with near-zero propagation delay and includes undershoot clamp diodes on control inputs.

Feature Summary

• Utilizes a charge pump to elevate gate voltage for low and flat ON-state resistance characteristics over the operating range.
• Supports rail-to-rail switching on data ports, enabling 0 to 5V switching at 3.3V VCC and 0 to 3.3V switching at 2.5V VCC.
• Features dedicated Ioff circuitry that prevents damaging current backflow through the device during partial-power-down mode.
• Includes internal enable signal logic and data/control inputs equipped with undershoot clamp diodes.

Applications

• PCI Interface
• Differential Signal Interface
• Memory Interleaving
• Bus Isolation
• Low-Distortion Signal Gating

Procurement Notes

Verify the specific ordering suffix 'G4' against the manufacturer's official documentation to confirm lead-free status and RoHS compliance. Ensure the component matches the RGY package designation for the 20-pin VQFN form factor. Confirm the moisture sensitivity level rating aligns with your assembly process requirements before procurement.

Selection Notes

Select this component when designing broadband communications or data-intensive computing systems requiring optimized interface capabilities. It is suitable for applications needing rail-to-rail switching and minimal signal distortion due to its low capacitance profile. Ensure the control input voltage levels are compatible with TTL or 5V/3.3V CMOS outputs as specified in the datasheet.

Part Context

This part belongs to the SN74CB3Q3245 family of high-bandwidth FET bus switches. The RG suffix indicates the VQFN package type, while the final 'G4' typically denotes environmental compliance attributes such as being lead-free and RoHS compliant. It serves as a direct functional equivalent to devices like the IDTQS384.

Replacement Considerations

The SN74CB3Q3245RGYR is the standard production version of this device. Verify if the 'G4' suffix is required for specific regulatory compliance or if the base part number suffices for your application needs.

FAQ

How does the device handle partial-power-down scenarios?

The device incorporates Ioff circuitry that prevents damaging current backflow through the I/O ports when the device is powered down, ensuring isolation during power-off states.

What is the maximum switching frequency for the control input?

The maximum switching frequency for the OE control input is 20 MHz when VCC is 3.3V ± 0.3V.