UCD9080 Datasheet | Texas Instruments

FEATURES - 234 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-m V 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 - Telemunications Switches - Servers - Networking Equipment - Test Equipment - Any System Requiring Sequencing of Multiple Voltage Rails DESCRIPTION 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-m V resolution of voltage rails, and requires no external memory or clock. The UCD9080 monitors the voltage rails independently at more than a 20-k Hz rate and has a high degree of rail sequence and rail error-response configurability. The sequencing of rails can be based on time or on time 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. 10 k W 3.3 V 0.01 m F 3.3 V 3.3 V 3.3 V 3.3 V 100 k W 10 k W 10 k W To I C...