The ISO721 ISO721M ISO722
are digital isolators with a logic input and output Buffer
separated by a silicon oxide (SiO2) insulation barrier. This barrier provides galvanic isolation of up to 4000 V. Used in conjunction with isolated power supplies, these devices prevent noise currents on a data bus or other Circuits
from entering the local ground, and interfering with or damaging sensitive circuitry. A binary input signal is conditioned, translated to a balanced signal, then differentiated by the capacitive isolation barrier. Across the isolation barrier, a differential Comparator
receives the logic transition information, then sets or resets a Flip-Flop
and the output circuit accordingly. A periodic update pulse is sent across the barrier to ensure the proper dc level of the output. If this dc-refresh pulse is not received for more than 4 ?s, the input is assumed to be unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state.