Maxim Integrated DS21Q55 - Manual (Page 166)

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23.9 Component Specifications
TRANSFORMER SPECIFICATIONS Table 25-1
SPECIFICATION RECOMMENDED VALUE
Turns Ratio 3.3V Applications 1:1 (receive) and 1:2 (transmit) ±2%
Primary Inductance 600
µ
H minimum
Leakage Inductance 1.0
µ
H maximum
Intertwining Capacitance 40pF maximum
Transmit Transformer DC Resistance
Primary (Device Side)
Secondary
1.0O maximum
2.0O maximum
Receive Transformer DC Resistance
Primary (Device Side)
Secondary
1.2O maximum
1.2O maximum