UCD9080 Power Supply Sequencer and Monitor | TI.com

UCD9080 (NRND) Power Supply Sequencer and Monitor

Power Supply Sequencer and Monitor - UCD9080

Not Recommended for New Designs (NRND)

Replaced By UCD9081 – The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. The device is a pin-compatible upgrade to the UCD9080 with enhanced functionality. Please see the UCD9081 product page at: http://focus.ti.com/docs/prod/folders/print/ucd9081.html

TI does not recommend using this part in a new design. This product continues to be in production to support existing customers.


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
    • Telecommunications Switches
    • Servers
    • Networking Equipment
    • Test Equipment
    • Any System Requiring Sequencing of Multiple Voltage Rails

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