Product details

Supply voltage (Min) (V) 3 Number of supplies monitored 8 Supply voltage (Max) (V) 3.6 Iq (Typ) (uA) 3000 Time delay (ms) Programmable Number of sequenced outputs 8 Rating Catalog
Supply voltage (Min) (V) 3 Number of supplies monitored 8 Supply voltage (Max) (V) 3.6 Iq (Typ) (uA) 3000 Time delay (ms) Programmable Number of sequenced outputs 8 Rating Catalog
VQFN (RHB) 32 25 mm² 5.0 x 5.0
  • Single Supply Voltage: 3.3 V
  • Low Power Consumption: 3-mA Nominal Supply Current
  • Sequences and Monitors Eight Voltage Rails
  • Rail Voltages Sampled With 3.2-mV Resolution
  • Internal or External Voltage Reference
  • Four Configurable Digital Outputs for Power-On-Reset and Other Functions
  • Configurable Digital Output Polarity
  • Flexible Rail Sequencing Based on Timeline (ms), Parent Rail Regulation Window, or Parent Rail Achieving Defined Threshold
  • Independent Under- and Overvoltage Thresholds Per Rail
  • Configurable Regulation Expiration Times Per Rail
  • Flexible Alarm Processing: Ignore, Log Only, Retry n Times, Retry Continuously, Sequence, Parent Rail Can Shutdown Child Rails
  • Alarm Conditions Logged With Timestamp: Under- and Overvoltage Glitch, Sustained Under- and Overvoltage, Rail Did Not Start
  • On-Chip Flash for Storing User Data
  • Error Logging to Flash for System Failure Analysis
  • I2C™ Interface for Configuration and Monitoring
  • Microsoft Windows™ GUI for Configuration and Monitoring
  • APPLICATIONS
    • Telecommunications Switches
    • Servers
    • Networking Equipment
    • Test Equipment
    • Industrial
    • Any System Requiring Sequencing of Multiple Voltage Rails

All other trademarks are the property of their respective owners

  • Single Supply Voltage: 3.3 V
  • Low Power Consumption: 3-mA Nominal Supply Current
  • Sequences and Monitors Eight Voltage Rails
  • Rail Voltages Sampled With 3.2-mV Resolution
  • Internal or External Voltage Reference
  • Four Configurable Digital Outputs for Power-On-Reset and Other Functions
  • Configurable Digital Output Polarity
  • Flexible Rail Sequencing Based on Timeline (ms), Parent Rail Regulation Window, or Parent Rail Achieving Defined Threshold
  • Independent Under- and Overvoltage Thresholds Per Rail
  • Configurable Regulation Expiration Times Per Rail
  • Flexible Alarm Processing: Ignore, Log Only, Retry n Times, Retry Continuously, Sequence, Parent Rail Can Shutdown Child Rails
  • Alarm Conditions Logged With Timestamp: Under- and Overvoltage Glitch, Sustained Under- and Overvoltage, Rail Did Not Start
  • On-Chip Flash for Storing User Data
  • Error Logging to Flash for System Failure Analysis
  • I2C™ Interface for Configuration and Monitoring
  • Microsoft Windows™ GUI for Configuration and Monitoring
  • APPLICATIONS
    • Telecommunications Switches
    • Servers
    • Networking Equipment
    • Test Equipment
    • Industrial
    • Any System Requiring Sequencing of Multiple Voltage Rails

All other trademarks are the property of their respective owners

The UCD9081 power-supply sequencer controls the enable sequence of up to eight independent voltage rails and provides four general-purpose digital outputs (GPO). 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 UCD9081 monitors the voltage rails independently and has a high degree of rail sequence and alarm response options. 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 UCD9081 monitors can be configured to shut down a user-defined set of other rails and GPOs, and alarm conditions are monitored on a per-rail basis.

The UCD9081 power-supply sequencer controls the enable sequence of up to eight independent voltage rails and provides four general-purpose digital outputs (GPO). 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 UCD9081 monitors the voltage rails independently and has a high degree of rail sequence and alarm response options. 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 UCD9081 monitors can be configured to shut down a user-defined set of other rails and GPOs, and alarm conditions are monitored on a per-rail basis.

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Technical documentation

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Type Title Date
* Data sheet UCD9081 8-Channel Power Supply Sequencer and Monitor With Error Logging datasheet (Rev. C) 30 Nov 2016
Technical article 3 quiescent-current (Iq) specifications you need to understand 12 Nov 2021
Technical article Sequencing and managing multiple power rails in a system: common questions answered 01 Feb 2017
Application note UCD9081 Programming Guide (Rev. B) 09 Nov 2010
User guide Advanced Sequencing and Monitoring Using the UCD9081 (Rev. A) 06 May 2010
Application note Communicating With the UCD9081; Unpowered, in System 22 Dec 2008
Application note 5 VIN solution using DCDC Controllers, a LDO, and a Digitally Prog. Sequencer 24 Nov 2008
Application note Monitoring Fan Tachometers using the UCD908x Devices 17 Oct 2008
User guide UCD9081 Power Supply Sequencer and Monitor EVM 03 Sep 2008
Application note Expanded System Monitoring Functions with UCD9080 (Rev. A) 05 Nov 2007

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

UCD9081EVM — UCD9081EVM Evaluation Module

The UCD9081EVM facilitates evaluation of the UCD9081 Power Supply Sequencer and Monitor. The UCD9081EVM allows a user to configure sequencing and monitoring of the 8 on board power supplies or external power supplies via on board headers.
In stock
Limit: 3
Interface adapter

USB-TO-GPIO — USB Interface Adapter EVM

This EVM serves as an interface adapter or a bridge between a host PC (IBM™ compatible) and one or multiple slave devices via a standard type-A to mini-B USB cable. The communication between the USB interface adapter and the host PC is via USB, while the communication between the USB (...)

In stock
Limit: 3
GUI for evaluation module (EVM)

UCD9081 EVM GUI exe file (Rev. A)

SLVC173A.ZIP (408 KB)
GUI for evaluation module (EVM)

UCD9081 GUI Win 7

SLVC490.ZIP (162 KB)
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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