SI8431AB-C-IS Silicon Laboratories Inc, SI8431AB-C-IS Datasheet - Page 24

• Manufacturer Part Number: SI8431AB-C-IS
• Manufacturer: Silicon Laboratories Inc

Specifications of SI8431AB-C-IS

• Operating Supply Voltage (typ): 3.3/5V
• Lead Free Status / RoHS Status: Compliant

Si8430/31/35
4. Errata and Design Migration Guidelines (Revision C Only)
The following errata apply to Revision C devices only. See "6. Ordering Guide" on page 26 for more details. No
errata exist for Revision D devices.
4.1. Enable Pin Causes Outputs to Go Low (Revision C Only)
When using the enable pin (EN1, EN2) function on the ISOpro 3-channel (Si8430/1), the corresponding output pin
states (pin = An, Bn, where n can be 1…3) are driven to a logic low (to ground) when the enable pin is disabled
(EN1 or EN2 = 0). This functionality is different from the legacy 3-channel (Si8430/1) isolators. On those devices,
the isolator outputs go into a high-impedance state (Hi-Z) when the enable pin is disabled (EN1 = 0 or EN2 = 0).
4.1.1. Resolution
The enable pin functionality causing the outputs to go low is supported in production for Revision C of the ISOpro
devices. Revision D corrects the enable pin functionality (i.e., the outputs will go into the high-impedance state to
match the legacy isolator products). Refer to the Ordering Guide sections of the data sheet(s) for current ordering
information.
4.2. Power Supply Bypass Capacitors (Revision C Only)
When using the ISOpro isolators with power supplies > 4.5 V, sufficient VDD bypass capacitors must be present on
both the VDD1 and VDD2 pins to ensure the VDD rise time is less than 0.5 V/µs (which is > 9 µs for a > 4.5 V
supply). Although rise time is power supply dependent, > 1 µF capacitors are required on both power supply pins
(VDD1, VDD2) of the isolator device.
4.2.1. Resolution
This issue has been corrected with Revision D of the device. Refer to “6. Ordering Guide” for current ordering
information.
4.3. Latch Up Immunity (Revision C Only)
ISOpro latch up immunity generally exceeds ± 200 mA per pin. Exceptions: Certain pins provide < 100 mA of latch-
up immunity. To increase latch-up immunity on these pins, 100  of equivalent resistance must be included in
series with all of the pins listed in Table 15. The 100  equivalent resistance can be comprised of the source
driver's output resistance and a series termination resistor. The Si8431 is not affected when using power supply
voltages (VDD1 and VDD2) < 3.5 V.
4.3.1. Resolution
This issue has been corrected with Revision D of the device. Refer to “6. Ordering Guide” for current ordering
information.
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Affected Ordering Part Numbers*
SI8430SV-C-IS/IS1, SI8431SV-C-IS/IS1
SI8435SV-C-IS/IS1
*Note: "SV" = Speed Grade/Isolation Rating (AA, AB, BA, BB).
Table 15. Affected Ordering Part Numbers (Revision C Only)
Revision
Device
C
C
Rev. 1.2
Pin#
10
14
14
5
5
Name
EN2
A3
B1
A3
B1
Input or Output
Pin Type
Output
Output
Input
Input