The ISO7520C and ISO7521C provide galvanic isolation of up to 4243
VRMS for 1 minute per UL and 6000 VPK per VDE. These
devices are also certified to 5000 VRMS reinforced insulation per end
equipment standards IEC 60950-1, IEC 61010-1, and IEC 60601-1. These digital isolators have two
isolated channels with unidirectional (ISO7520C) and bidirectional (ISO7521C) channel
configurations. Each isolation channel has a logic input and output buffer separated by a silicon
oxide (SiO2) insulation barrier. 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. The devices have TTL input
thresholds and can operate from 3.3- and 5-V supplies. All inputs are 5-V tolerant when supplied
from 3.3-V supplies.
NOTE: The ISO7520C and ISO7521C are specified for
signaling rates up to 1 Mbps. Due to their fast response time, these devices will also transmit
faster data with much shorter pulse widths. Designers must add external filtering to remove
spurious signals with input pulse duration < 20 ns, if desired.
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