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UC3903Q Datasheet(PDF) 1 Page - Texas Instruments |
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UC3903Q Datasheet(HTML) 1 Page - Texas Instruments |
1 / 16 page 1 FEATURES DESCRIPTION BLOCK DIAGRAM Note: Pin numbers refer to J, N and DW packages. UC1903 UC2903 UC3903 www.ti.com ........................................................................................................................................ SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008 Quad Supply and Line Monitor • Inputs for Monitoring up to Four Separate The UC1903 family of quad supply and line monitor Supply Voltage Levels integrated circuits will respond to under- and over-voltage conditions on up to four continuously • Internal Inverter for Sensing a Negative Supply monitored voltage levels. An internal op-amp inverter Voltage allows at least one of these levels to be negative. A • Line/Switch Sense Input for Early Power separate line/switcher sense input is available to Source Failure Warning provide early warning of line or other power source • Programmable Under- and Over-Voltage Fault failures. Thresholds with Proportional Hysteresis The fault window adjustment circuit on these devices • A Precision 2.5-V Reference provides easy programming of under- and over-voltage thresholds. The thresholds, centered • General Purpose Op-Amp for Auxiliary Use around a precision 2.5-V reference, have an input • Three High Current, >3 0mA, Open-Collector hysteresis that scales with the window width for Outputs Indicate Over-Voltage, Under-Voltage precise, glitch-free operation. A reference output pin and Power OK Conditions allows the sense input fault windows to be scaled • 8-V to 40-V Supply Operation with 7-mA independently using simple resistive dividers. Stand-By Current The three open collector outputs on these devices sink in excess of 30 mA of load current when active. The under- and over-voltage outputs respond after separate, user defined, delays to respective fault conditions. The third output is active during any fault condition including under- and over-voltage, line/switcher faults, and input supply under-voltage. The off state of this output indicates a "power OK" situation. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 1999–2008, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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