SNAS818B July   2021  – May 2022 CDCDB800

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 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Fail-Safe Input
      2. 8.3.2 Output Enable Control
      3. 8.3.3 SMBus
        1. 8.3.3.1 SMBus Address Assignment
    4. 8.4 Device Functional Modes
      1. 8.4.1 CKPWRGD_PD# Function
      2. 8.4.2 OE[7:0]# and SMBus Output Enables
      3. 8.4.3 Output Slew Rate Control
      4. 8.4.4 Output Impedance Control
    5. 8.5 Programming
    6. 8.6 Register Maps
      1. 8.6.1 CDCDB800 Registers
  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
        1. 9.2.2.1 Output Enable Control Method
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Examples
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 TICS Pro
    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

8.4.1 CKPWRGD_PD# Function

The CKPWRGD_PD# pin is used to set two state variables inside of the device: PWRGD and PD#. The PWRGD and PD# variables control which functions of the device are active at any time, as well as the state of the input and output pins.

The PWRGD and PD# states are multiplexed on the CKPWRGD_PD# pin. CKPWRGD_PD# must remain below VOL and not exceed VDDR + 0.3 V until VDD and VDDR are present and within the recommended operating conditions. After CKPWRGD_PD# is set high, a valid CLKIN must be present to use PD#.

The first rising edge of the CKPWRGD_PD# pin sets PWRGD = 1. After PWRGD is set to 1, the CKPWRGD_PD# pin is used to assert PD# mode only. PWRGD variable will only be cleared to 0 with the removal of VDD and VDDR.

GUID-20201112-CA0I-W9MG-VK3L-V58F2D48LR1N-low.gifFigure 8-1 PWRGD and PD# State Changes