The UC1903 family of quad supply and line monitor integrated circuits will respondto under- and over-voltage conditions on up to four continuously monitored voltage levels. An internal op-amp inverter allows at least one of these levels to be negative. A separate line/switcher sense input is available to provide early warning of line or other power source failures.

The fault window adjustment circuit on these devices provides easy programming of under- and over-voltage thresholds. The thresholds, centered around a precision 2.5-V reference, have an input hysteresis that scales with the window width for precise, glitch-free operation. A reference output pin allows the sense input fault windows to be scaled independently using simple resistive dividers.

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.

An additional, uncommitted, general purpose op-amp is also included. This op-amp, capable of sourcing 20 mA of output current, can be used for a number of auxiliary functions including the sensing and amplification of a feedback error signal when the 2.5-V output is used as a system reference.

These parts operate over an 8-V to 40-V input supply range and require a typical stand-by current of only 7 mA.

• Inputs for Monitoring up to Four Separate Supply Voltage Levels
• Internal Inverter for Sensing a Negative Supply Voltage
• Line/Switch Sense Input for Early Power Source Failure Warning
• Programmable Under- and Over-Voltage Fault Thresholds with Proportional Hysteresis
• A Precision 2.5-V Reference
• General Purpose Op-Amp for Auxiliary Use
• Three High Current, >3 0mA, Open-Collector Outputs Indicate Over-Voltage, Under-Voltage and Power OK Conditions
• 8-V to 40-V Supply Operation with 7-mA Stand-By Current

• Number of supplies monitored
• 4
• Threshold voltage 1 (Typ) (V)
• 1.8
• Features
• Negative voltage monitoring, Undervoltage and overvoltage monitor, Wide input voltage
• Reset threshold accuracy (%)
• 3
• Output driver type/reset output
• Active-low, Open-drain
• Time delay (ms)
• Programmable
• Rating
• Military
• Watchdog timer WDI (sec)
• None
• Operating temperature range (C)
• -55 to 125

UC1903的完整型号有：5962-88697012A、5962-8869701VA、UC1903J、UC1903J883B、UC1903L、UC1903L883B，以下是这些产品的关键参数及官网采购报价：

5962-88697012A，工作温度：-55 to 125，封装：LCCC (FK)-20，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网5962-88697012A的批量USD价格：48.848（1000+）

5962-8869701VA，工作温度：-55 to 125，封装：CDIP (J)-18，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网5962-8869701VA的批量USD价格：37.683（1000+）

UC1903J，工作温度：-55 to 125，封装：CDIP (J)-18，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网UC1903J的批量USD价格：27.913（1000+）

UC1903J883B，工作温度：-55 to 125，封装：CDIP (J)-18，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网UC1903J883B的批量USD价格：37.683（1000+）

UC1903L，工作温度：-55 to 125，封装：LCCC (FK)-20，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网UC1903L的批量USD价格：39.078（1000+）

UC1903L883B，工作温度：-55 to 125，封装：LCCC (FK)-20，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网UC1903L883B的批量USD价格：48.848（1000+）

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