SN74CB3Q3253RGYR

Overview

The SN74CB3Q3253RGYR is a dual 1-of-4 FET multiplexer/demultiplexer designed for low-voltage applications. It operates within a supply voltage range of 2.3V to 3.6V and features high-bandwidth data paths up to 500MHz. The device provides rail-to-rail switching capabilities, supporting 0V to 5V signal levels with a 3.3V VCC and 0V to 3.3V with a 2.5V VCC. It includes 5V tolerant I/Os that function correctly whether the device is powered up or down. Key electrical characteristics include a typical ON-state resistance (ron) of 4Ω and low input/output capacitance.

Feature Summary

• High-bandwidth data path supporting frequencies up to 500MHz
• Rail-to-rail switching on data I/O ports across specified voltage ranges
• Bidirectional data flow with near-zero propagation delay
• Ioff circuitry supports partial-power-down mode operation

Applications

• Video broadcasting IP-based multi-format transcoder
• Video communications system
• USB interface bus isolation

Procurement Notes

Verify the specific package type matches the design requirements, as the SN74CB3Q3253 family is available in multiple packages including SSOP, TVSOP, TSSOP, VQFN, and SOT-23-THN. Confirm that the RGY suffix corresponds to the 16-pin VQFN package required for the PCB layout. Ensure control inputs are tied to VCC or GND to maintain proper operation and check thermal specifications if operating at high ambient temperatures.

Selection Notes

Select this component when designing systems requiring high-speed signal routing with low distortion. The device is suitable for broadband communications, networking, and data-intensive computing where minimal loading is critical. Consider the 5V tolerance feature if interfacing with legacy logic levels while operating from a lower supply voltage. Verify that the bidirectional nature of the switches aligns with the data flow requirements of the target application.

Part Context

This part belongs to the CB3Q family of low-voltage high-bandwidth bus switches from Texas Instruments. It utilizes a charge pump to elevate the gate voltage of the pass transistor, ensuring low and flat ON-state resistance over the operating range. This technology minimizes propagation delay and supports efficient signal transmission in compact surface-mount designs.

Replacement Considerations

SN74CBT3253RGYR

FAQ

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

The SN74CB3Q3253RGYR includes Ioff circuitry that prevents damaging current backflow through the device when it is powered down, allowing for safe isolation during power-off states.

What is the maximum switching frequency for the control inputs?

The maximum switching frequency for the OE or S control inputs is 20MHz under recommended operating conditions.