CMOS switch offers high-speed signals with low propagation delay

Texas Instruments SN3257-Q1 2:1 SPDT 4-Ch CMOS Switch supports high-speed signals with low propagation delay. The device provides a 2:1 (SPDT) switch configuration with four-channels making it excellent for multi-lane protocols including SPI and I2S. The device can support bidirectional analog and digital signals on the source (SxA, SxB) and drain (Dx) pins. It can pass signals above supply up to VDD x 2, with maximum input and output voltage of 5.5V.

The switch has an active-low EN pin that is employed to enable and disable all channels simultaneously. When the EN pin is LOW, one of the two switch paths is chosen based on the state of SEL pin. Powered-off protection up to 3.6V on the signal path of the device gives isolation when the supply voltage is stopped (VDD = 0V). Without this protection feature, switches are able to back-power the supply rail through an internal ESD diode and create possible harm to the system.

The switch is shielded from potential damage by fail-safe logic circuitry that enables voltages on the logic control pins to be implemented before the supply pin. Both TTL and CMOS logic compatibility is assured, via logic control inputs have 1.8V logic compatible thresholds. An integrated pull-down resistor on the logic pins eliminates external components to decrease system size and cost.

The devices are AEC-Q100 qualified for automotive applications. They are suitable for SPI multiplexing, I2S multiplexing, eSIM multiplexing, eMMC multiplexing, Flash memory sharing, battery management system , telematics control unit, smart telematics gateway, rear seat entertainment, digital cockpit processing unit, automotive head unit, automotive navigation, ADAS domain controller, surround view system ECU, and on-board and wireless charger.