1 Features
1• Highest Signaling Rate: 1 Mbps
• Propagation Delay Less Than 20 ns
• Low-Power Consumption
• Wide Ambient Temperature: –40°C to 105°C
• 50 kV/μs Transient Immunity Typical
• Operates From 3.3-V or 5-V Supply and Logic
Levels
• 3.3-V and 5.0-V Level Translation
• Safety and Regulatory Approvals
– 6000 VPK Isolation per DIN V VDE V 0884-10
and DIN EN 61010-1
– 4243 VRMS Isolation for 1 Minute per UL 1577
– CSA Component Acceptance Notice 5A, IEC
60950-1, IEC 61010-1, and IEC 60601-1 End
Equipment Standards
– TUV 5000 V RMS Isolation per EN 60950-1 and
EN 61010-1
– CQC Certification per GB4943.1-2011

2 Applications
• Opto-Coupler Replacement in:
– Industrial Field-Buses
– ProfiBuses
– ModBuses
– DeviceNet™ Data Buses
– Servo Control Interfaces
– Motor Control
– Power Supplies
– Battery Packs

3 Description
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.