The UCD9080 power-supply sequencer controls the enable sequence of up to eight independent voltage rails and provides four general-purpose digital outputs. The device operates from a 3.3-V supply, provides 3.2-mV resolution of voltage rails, and requires no external memory or clock. The UCD9080 monitors the voltage rails independently at more than a 20-kHz rate and has a high degree of rail sequence and rail error-response configurability. The sequencing of rails can be based on timed events or on timed events in conjunction with other rails achieving regulation or a voltage threshold. In addition, each rail is monitored for undervoltage and overvoltage glitches and thresholds. Each rail the UCD9080 monitors can be configured to shut down a user-defined set of other rails, and alarm conditions are monitored on a per-rail basis.

Figure 1 shows the UCD9080 power-supply sequencer in a typical application.

• Single Supply Voltage: 3.3 V
• Low Power Consumption
• Sequences and Monitors up to Eight Voltage Rails
• Rail Voltages Sampled Every 50 µs With 3.2-mV Resolution
• Four Configurable Digital Outputs for Power-On Reset and Other Functions
• Configurable Rail-Enable Output Polarity
• Flexible Rail Sequencing: Timeline (ms), Parent Rail Regulation Window, Parent Rail Achieving Defined Threshold
• Under- and Overvoltage Thresholds: Settable Per-Rail
• Regulation Expiration Time: Settable Per-Rail
• Flexible Rail Shutdown: Parent Rail Shutdown Can Shut Down Child Rails, Independent Rail Configuration
• Per-Rail Alarm Conditions, With Timestamp: Under- and Overvoltage Glitch, Sustained Under- and/or Overvoltage, Rail Did Not Start
• I2C Interface for Configuration and Monitoring
• Microsoft™ Windows™ GUI for Configuration and Monitoring
• APPLICATIONS
  • Telecommunications Switches
  • Servers
  • Networking Equipment
  • Test Equipment
  • Any System Requiring Sequencing of Multiple Voltage Rails

TMS320 is a trademark of Texas Instruments. Microsoft, Windows are trademarks of Microsoft Corporation. All other trademarks are the property of their respective owners.