SN74CB3Q3125PWRG4

Overview

The SN74CB3Q3125PWRG4 is a quadruple FET bus switch designed for high-bandwidth applications. It operates within a VCC range of 2.3V to 3.6V and supports data I/O voltages from 0V to 5V. The device features four independent channels with separate output-enable inputs, utilizing a charge pump to maintain low ON-state resistance (ron) characteristics. It provides rail-to-rail switching capabilities and includes undershoot clamp diodes on data and control inputs.

Feature Summary

• High-bandwidth data path supporting up to 500MHz frequencies
• 5V tolerant I/Os compatible with various signaling levels while powered or unpowered
• Low input/output capacitance minimizes loading and signal distortion
• Ioff circuitry enables partial-power-down mode operation

Applications

• IP phones: wired and wireless
• Optical modules
• Private branch exchange (PBX)
• WiMAX and wireless infrastructure equipment

Procurement Notes

Verify the G4 suffix indicates RoHS compliance and green material status. Confirm the PW package designation corresponds to the TSSOP-14 form factor. Ensure the operating temperature range meets system requirements of -40°C to +85°C. Check current availability status as the non-G4 PW variant may be obsolete.

Selection Notes

Select this component for designs requiring bidirectional data flow with near-zero propagation delay. It is suitable for interfaces supporting 0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V logic levels. Control inputs are compatible with TTL, 5V, or 3.3V CMOS outputs.

Part Context

This part belongs to the SN74CB3Q3125 family of digital bus switches. It is manufactured by Texas Instruments and utilizes a charge pump mechanism to elevate the gate voltage of pass transistors. This architecture ensures flat ON-state resistance across the operating range, distinguishing it from standard CMOS switches.

Replacement Considerations

SN74CB3Q3125PW

FAQ

What is the maximum switching frequency for the control input?

The maximum switching frequency (fOE) for the control input is 20 MHz.

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

The device supports partial-power-down mode via Ioff circuitry, which prevents damaging current backflow through the device when it is powered down.