SI8451AA-A-IS1R Silicon Laboratories Inc, SI8451AA-A-IS1R Datasheet - Page 22

• Manufacturer Part Number: SI8451AA-A-IS1R
• Description: IC ISOLATOR DGTL 5CH 16SOIC
• Manufacturer: Silicon Laboratories Inc
• Series: ISOpror

Specifications of SI8451AA-A-IS1R

• Inputs - Side 1/side 2: 4/1
• Number Of Channels: 5
• Isolation Rating: 1000Vrms
• Voltage - Supply: 2.7 V ~ 5.5 V
• Data Rate: 1Mbps
• Propagation Delay: 35ns
• Output Type: Tri-State
• Package / Case: 16-SOIC (3.9mm Width)
• Operating Temperature: -40°C ~ 125°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Si8450/51/52/55
2.4. Layout Recommendations
To ensure safety in the end user application, high voltage circuits (i.e., circuits with >30 V
) must be physically
AC
separated from the safety extra-low voltage circuits (SELV is a circuit with <30 V
) by a certain distance
AC
(creepage/clearance). If a component, such as a digital isolator, straddles this isolation barrier, it must meet those
creepage/clearance requirements and also provide a sufficiently large high-voltage breakdown protection rating
(commonly referred to as working voltage protection). Table 6 on page 15 and Table 7 on page 15 detail the
working voltage and creepage/clearance capabilities of the Si84xx. These tables also detail the component
standards (UL1577, IEC60747, CSA 5A), which are readily accepted by certification bodies to provide proof for
end-system specifications requirements. Refer to the end-system specification (61010-1, 60950-1, etc.)
requirements before starting any design that uses a digital isolator.
2.4.1. Supply Bypass
The Si84xx family requires a 1 µF bypass capacitor between V
and GND1 and V
and GND2. The capacitor
DD1
DD2
should be placed as close as possible to the package. To enhance the robustness of a design, it is further
recommended that the user include 100  resistors in series with the inputs, outputs, and supply pins if the system
is excessively noisy. See "3. Errata and Design Migration Guidelines" on page 26 for more details.
2.4.2. Pin Connections
No connect pins are not internally connected. They can be left floating, tied to
, or tied to GND.
V
DD
2.4.3. Output Pin Termination
The nominal output impedance of an isolator driver channel is approximately 85 , ±40%, which is a combination
of the value of the on-chip series termination resistor and channel resistance of the output driver FET. When driving
loads where transmission line effects will be a factor, output pins should be appropriately terminated with controlled
impedance PCB traces.
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Rev. 1.3