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Si8622BT-IS データシート(PDF) 6 Page - Silicon Laboratories

部品番号 Si8622BT-IS
部品情報  Low-Power Single and Dual-Channel Digital Isolators
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メーカー  SILABS [Silicon Laboratories]
ホームページ  http://www.silabs.com
Logo SILABS - Silicon Laboratories

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3.1 Device Startup
Outputs are held low during powerup until VDD is above the UVLO threshold for time period tSTART. Following this, the outputs follow
the states of inputs.
3.2 Undervoltage Lockout
Undervoltage Lockout (UVLO) is provided to prevent erroneous operation during device startup and shutdown or when VDD is below its
specified operating circuits range. Both Side A and Side B each have their own undervoltage lockout monitors. Each side can enter or
exit UVLO independently. For example, Side A unconditionally enters UVLO when VDD1 falls below VDD1(UVLO–) and exits UVLO when
VDD1 rises above VDD1(UVLO+). Side B operates the same as Side A with respect to its VDD2 supply.
Figure 3.1. Device Behavior during Normal Operation
3.3 Layout Recommendations
To ensure safety in the end-user application, high-voltage circuits (i.e., circuits with >30 VAC) must be physically separated from the
safety extra-low-voltage circuits (SELV is a circuit with <30 VAC) by a certain distance (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 4.6 Insulation and Safety-Related
Specifications on page 21 and Table 4.8 IEC 60747-5-5 Insulation Characteristics for Si86xxxx1 on page 22 detail the working volt-
age and creepage/clearance capabilities of the Si86xx. 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, 60601-1, etc.) requirements before starting any design that uses a digital isolator.
3.3.1 Supply Bypass
The Si861x/2x family requires a 0.1 µF bypass capacitor between VDD1 and GND1 and VDD2 and GND2. The capacitor should be
placed as close as possible to the package. To enhance the robustness of a design, the user may also include resistors (50–300 Ω ) in
series with the inputs and outputs if the system is excessively noisy.
3.3.2 Output Pin Termination
The nominal output impedance of an isolator driver channel is approximately 50 Ω, ±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.
3.4 Fail-Safe Operating Mode
Si86xx devices feature a selectable (by ordering option) mode whereby the default output state (when the input supply is unpowered)
can either be a logic high or logic low when the output supply is powered. See Table 3.1 Si86xx Logic Operation on page 4 and
1. Ordering Guide for more information.
Si861x/2x Data Sheet
Device Operation
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Rev. 1.6 | 5


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