SG1548J-DESC中文资料High Reliability Supervisory Circuits and Voltage References数据手册Microchip规格书

描述 Description

Cross reference to 5962-8987801EA.The SG1548 is an integrated circuit capable of monitoring up to four positive DC supply voltages simultaneously for overvoltage and undervoltage fault conditions. An on-chip inverting op amp also allows monitoring one negative DC voltage. The fault tolerance window is accurately programmable from ±5% to ±40% using a simple divider network on the 2.5V reference. A single external capacitor sets the fault indication delay, eliminating false outputs due to switching noise, logic transition current spikes, and short-term AC line interruptions. An additional comparator referenced to 2.5V allows the AC line to be monitored for undervoltage conditions or for generation of a line clock. The comparator can also be used for programmable undervoltage lockout in a switching power supply. Uncommitted collector and emitter outputs permit both inverting and non-inverting operation. External availability of the precision 2.5V reference and open-collector logic outputs permit expansion to monitor additional voltage using available open-collector quad comparators.FEATURES· Monitors four DC voltages and the AC line· Precision 2.5V ±1% low-drift reference· Fault tolerance adjustable from ±5% to ±40%· ±3% trip threshold tolerance over temperature· Separate 10mA, 40V overvoltage, undervoltage and AC line fault outputs· Fault delay programmable with a single capacitor· 30mV comparator hysteresis to prevent oscillations· On-chip inverting op amp for negative voltage· Open-collector output logic or expandability· Operation from 4.5V to 40V supply HIGH RELIABILITY FEATURES- SG1548·Available to MIL-STD-883·Radiation data available·LMI level \"S\" processing available