Si8442BA-D-IU Silicon Laboratories Inc, Si8442BA-D-IU Datasheet - Page 20

• Manufacturer Part Number: Si8442BA-D-IU
• Description: Isolator Interface IC Quad Ch 1 kV Iso 150M 2/2
• Manufacturer: Silicon Laboratories Inc

Specifications of Si8442BA-D-IU

• Number Of Channels: 4
• Propagation Delay Time: 35 ns
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Supply Current: 9 mA
• Power Dissipation: 275 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: QSOP-16
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: Details

Si84x/5x QSOP
3.3. 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 11 and Table 7 on page 12 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, 60950, 60601, etc.)
requirements before starting any design that uses a digital isolator.
3.3.1. Supply Bypass
The Si84xx requires a 1 µF bypass capacitor between V
and GND1 and V
and GND2. The capacitor should
DD1
DD2
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 and outputs if the supply or system is excessively
noisy.
3.3.2. 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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