Non Latching Short Circuit Protect for I/O Drivers
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
Most short-circuit protect schemes for I/O interface drivers involve some mechanism (temperature, voltage or current) that senses a shorted interface and through various mechanisms (shift register latch, thermal cut-off, etc.) hold the output of the driver off until some digital command resets the circuit after the short has been removed or in the case of temperature sensing, the module cools off. The drawing shows a circuit for protecting the driver output while shorted without latching in the protected state. Added features of this circuit are that it is active only during the low level input state (high output) and insensitive to any input transitions. Circuit Description.