SG1548J-DESC

DC:AC - Programmable Quad Line Fault Monitor; Package: DIP;

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