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SI8630BD-B-IS Datasheet(PDF) 7 Page - Silicon Laboratories |
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SI8630BD-B-IS Datasheet(HTML) 7 Page - Silicon Laboratories |
7 / 36 page 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 19 and Table 4.8 IEC 60747-5-5 Insulation Characteristics for Si86xxxx 1 on page 20 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 Si863x 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. Si8630/31/35 Data Sheet Device Operation silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 6 |
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