ADUM1250

Part: ADuM1250/ADuM1251 — Analog Devices, Inc.

Type: Hot Swappable, Dual I2C Isolators

Description: Hot swappable digital isolators with nonlatching, bidirectional communication channels compatible with I2C interfaces, based on iCoupler chip scale transformer technology.

Operating Conditions:

• Supply voltage: 3.0 V to 5.5 V
• Max operating temperature: 125 °C
• Max frequency: 1000 kHz

Key Specs:

• Input Supply Current, Side 1 (ADuM1250, 5 V): Typ 2.8 mA, Max 5.0 mA
• Input Supply Current, Side 1 (ADuM1250, 3.3 V): Typ 1.9 mA, Max 3.0 mA
• Leakage Currents (I SDA1 , I SDA2 , I SCL1 , I SCL2 ): Typ 0.01 μA, Max 10 μA (V SDA1 = V DD1 , V SDA2 = V DD2 , V SCL1 = V DD1 , V SCL2 = V DD2 )
• Logic Low Output Voltage (Side 2): Max 400 mV (I SDA2 = I SCL2 = 30 mA)
• Input Capacitance (C IN ): Typ 4 pF (Pin capacitance)
• Maximum Frequency: 1000 kHz
• Side 1 to Side 2 Rising Edge Propagation Delay (5 V): Typ 95 ns, Max 130 ns (C L1 = C L2 = 0 pF, R1 = 1.6 kΩ, R2 = 180 Ω)
• Common-Mode Transient Immunity (CM H , CM L ): 25 kV/μs

Features:

• Bidirectional I2C communication
• Open-drain interfaces
• Suitable for hot swap applications
• 30 mA current sink capability
• 1000 kHz operation
• 3.0 V to 5.5 V supply/logic levels
• 8-lead, RoHS compliant SOIC package
• High temperature operation: 125°C
• Qualified for automotive applications
• DIN EN IEC 60747-17 (VDE 0884-17) ► VIORM = 560 V peak
• UL 1577 ► VISO = 2500 V rms for 1 minute
• IEC/EN/CSA 62368-1
• IEC/CSA 61010-1
• CQC GB4943.1

Applications:

• Isolated I2C, SMBus, or PMBus interfaces
• Multilevel I2C interfaces
• Power supplies
• Networking
• Power over Ethernet
• Hybrid electric vehicle battery management

Package:

• 8-lead, RoHS compliant SOIC package
• 8-Lead Narrow-Body SOIC [SOIC_N] (R-8)

• Bidirectional I 2 C communication
• Open-drain interfaces
• Suitable for hot swap applications
• 30 mA current sink capability
• 1000 kHz operation
• 3.0 V to 5.5 V supply/logic levels
• 8-lead, RoHS compliant SOIC package
• High temperature operation: 125°C
• Qualified for automotive applications
• Safety and regulatory approvals
• DIN EN IEC 60747-17 (VDE 0884-17) ► VIORM = 560 V peak
• UL 1577 ► VISO = 2500 V rms for 1 minute
• IEC/EN/CSA 62368-1
• IEC/CSA 61010-1
• CQC GB4943.1

• Isolated I 2 C, SMBus, or PMBus interfaces
• Multilevel I 2 C interfaces
• Power supplies
• Networking
• Power over Ethernet
• Hybrid electric vehicle battery management

Figure 4. ADuM1250/ADuM1251 Pin Configuration

Table 8. ADuM1250 Pin Function Descriptions

All voltages are relative to their respective ground. All minimum and maximum specifications apply over the entire recommended operating range, unless otherwise noted. All typical specifications are at T A = 25°C, V DD1 = 3.3 V or 5 V, and V DD2 = 3.3 V or 5 V, unless otherwise noted.

Table 1. Electrical Characteristics

Ambient temperature = 25°C, unless otherwise noted.

Table 5.

1 All voltages are relative to their respective ground. See the Magnetic Field Immunity section for information about immunity to external magnetic fields.

Thermal performance is directly linked to PCB design and operating environment. Careful attention to the PCB thermal design is required.

Thermal resistance and characterization parameter values specified in Table 7 are defined and calculated based on the JEDEC JESD51 standards. For more details on their definition and usage, see JEDEC JESD51-12 and the Thermal Analysis section.

Figure 9 shows a typical application circuit including the pull-up resistors required for both Side 1 and Side 2 buses. Bypass capacitors with values from 0.01 μF to 0.1 μF are required between V DD1 and GND1 and between V DD2 and GND 2 . The 200 Ω resistor shown in Figure 9 is required for latch-up immunity when hot plugging if the ambient temperature is between 105°C and 125°C, and must be placed on the side being hot plugged. Use 200 Ω for 5 V V DD1 and 91 Ω for 3.3 V V DD1 .

Figure 9. Typical Isolated I 2 C Interface Using the ADuM1250

Figure 9 shows a typical application circuit including the pull-up resistors required for both Side 1 and Side 2 buses. Bypass capacitors with values from 0.01 μF to 0.1 μF are required between V DD1 and GND1 and between V DD2 and GND 2 . The 200 Ω resistor shown in Figure 9 is required for latch-up immunity when hot plugging if the ambient temperature is between 105°C and 125°C, and must be placed on the side being hot plugged. Use 200 Ω for 5 V V DD1 and 91 Ω for 3.3 V V DD1 .