UCD9080 Power Supply Sequencer and Monitor | TI.com

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Power Supply Sequencer and Monitor

Power Supply Sequencer and Monitor - UCD9080

Recommended alternative parts

  • 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
  • UCD9081  -  UCD9081 is a pin-compatible upgrade to UCD9080 with enhanced functionality. It is the preferred device part number for new designs.


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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Part number Order Number of supplies monitored VCC (Min) (V) VCC (Max) (V) Iq (Typ) (uA) Time delay (ms) Number of sequenced outputs Rating Package Group Package size: mm2:W x L (PKG)
UCD9080 Order now 8     3     3.6     4500     Programmable     8     Catalog     VQFN | 32     32VQFN: 25 mm2: 5 x 5 (VQFN | 32)    
UCD9081 Order now 8     3     3.6     3000     Programmable     8     Catalog     VQFN | 32     32VQFN: 25 mm2: 5 x 5 (VQFN | 32)