SCDS411D July   2019  – October 2022 SN3257-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Dynamic Characteristics
    7. 6.7 Timing Requirements
    8.     Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1  On-Resistance
    2. 7.2  Off-Leakage Current
    3. 7.3  On-Leakage Current
    4. 7.4  IPOFF Leakage Current
    5. 7.5  Transition Time
    6. 7.6  tON (EN) and tOFF (EN) Time
    7. 7.7  tON (VDD) and tOFF (VDD) Time
    8. 7.8  Break-Before-Make Delay
    9. 7.9  Propagation Delay
    10. 7.10 Skew
    11. 7.11 Charge Injection
    12. 7.12 Capacitance
    13. 7.13 Off Isolation
    14. 7.14 Channel-to-Channel Crosstalk
    15. 7.15 Bandwidth
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Bidirectional Operation
      2. 8.3.2 Beyond Supply Operation
      3. 8.3.3 1.8 V Logic Compatible Inputs
      4. 8.3.4 Powered-off Protection
      5. 8.3.5 Fail-Safe Logic
      6. 8.3.6 Integrated Pull-Down Resistors
    4. 8.4 Device Functional Modes
      1. 8.4.1 Truth Tables
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.1 Overview

The SN3257-Q1 is an automotive qualified 2:1 (SPDT) 4-channel switch with powered-off protection up to 3.6 V. Wide operating supply of 1.5 V to 5.5 V allows for use in applications where different supply voltages are available. The device supports bidirectional analog and digital signals on the source (SxA, SxB) and drain (Dx) pins. The wide bandwidth of this switch allows little or no attenuation of high-speed signals with minimum propagation delay.

The enable (EN) pin is an active-low logic pin that controls the connection between the source (SxA, SxB) and drain (Dx) pins of the device. The select pin (SEL) controls the state of all four channels of the SN3257-Q1 and determines which source pin is connected to the drain. Fail-Safe Logic circuitry allows voltages on the logic control pins to be applied before the supply pin, protecting the device from potential damage. All logic control inputs have 1.8 V logic compatible thresholds, ensuring both TTL and CMOS logic compatibility when operating in the valid supply voltage range.

Powered-off protection up to 3.6 V on the signal path of the SN3257-Q1 provides isolation when the supply voltage is removed (VDD = 0 V). Without this protection feature, the system can back-power the supply rail through an internal ESD diode and cause potential damage to the system.