Texas Instruments' SN3257-Q1 is an automotive-grade CMOS switch designed to support high-speed signals with low propagation delay. This switch features a 2:1 (SPDT) switch configuration with four channels, making it suitable for use in multi-lane protocols such as SPI and I2S.
The SN3257-Q1 supports bidirectional analog and digital signals on the source (SxA, SxB) and drain (Dx) pins. It can pass signals above the supply voltage up to VDD x 2, with a maximum input and output voltage of 5.5V. This allows for flexibility in signal routing and compatibility with various systems.
One notable feature of the SN3257-Q1 is its powered-off protection up to 3.6V on the signal path. This protection provides isolation when the supply voltage is removed, preventing potential damage to the system. Without this protection, switches can back-power the supply rail through an internal ESD diode, which can be harmful.
The SN3257-Q1 also incorporates fail-safe logic circuitry, which allows voltages on the logic control pins to be applied before the supply pin. This protects the device from potential damage that can occur if the supply voltage is applied before the logic control signals.
The logic control inputs of the SN3257-Q1 have 1.8V logic compatible thresholds, ensuring compatibility with both TTL and CMOS logic levels. Additionally, the switch includes an integrated pull-down resistor on the logic pins, eliminating the need for external components and reducing system size and cost.
In summary, Texas Instruments' SN3257-Q1 switch offers high-speed signal support with low propagation delay. Its 2:1 switch configuration and bidirectional signal capabilities make it suitable for multi-lane protocols. The powered-off protection and fail-safe logic circuitry enhance its reliability, while the integrated pull-down resistor simplifies system design.
AEC-Q100 qualified for automotive applications:
Ambient temperature (TA) range Grade 1: -40°C to +125°C
Wide supply range: 1.5 V to 5.5 V
Low propagation delay: 78 ps
Low on-resistance: 5 Ω
High bandwidth: 1.2 GHz
Bidirectional signal path
Supports input voltage beyond the supply
1.8 V logic compatible
Integrated pull-down resistor on the logic pins
Fail-safe logic
Powered-off protection up to 3.6 V signals
Multiplexing: SPI, I2S, eSIM, and eMMC
Flash memory sharing
Battery management systems (BMS)
Telematics control units (TCU)
Smart telematic gateways
Rear seat entertainment
Digital cockpit processing units
Automotive head units
Automotive navigation
ADAS domain controllers
Surround-view system ECU
Onboard (OBC) and wireless chargers
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