ADUM1251

Part: ADuM1250ARZ — Analog Devices

Type: Hot Swappable, Dual I2C Digital Isolator

Description: 3.0 V to 5.5 V dual-channel bidirectional I2C digital isolator operating up to 1000 kHz with 30 mA current sink capability and 2500 V rms isolation rating.

Operating Conditions:

• Supply voltage: 3.0 V to 5.5 V (VDD1, VDD2)
• Operating temperature: -40°C to +105°C (A Grade)
• Maximum frequency: 1000 kHz
• Static output loading: 0.5 mA to 3 mA (Side 1), 0.5 mA to 30 mA (Side 2)

Absolute Maximum Ratings:

• Max supply voltage: -0.5 V to +7.0 V (VDD1 to GND1, VDD2 to GND2)
• Max continuous current: ±18 mA (Side 1 average output current per pin), ±100 mA (Side 2 average output current per pin)
• Max junction/storage temperature: -55°C to +150°C (Storage Temperature)

Key Specs:

• Supply current, Side 1 (ADuM1250, 5 V): 2.8 mA typ, 5.0 mA max (VDD1 = 5 V)
• Supply current, Side 2 (ADuM1250, 5 V): 2.7 mA typ, 5.0 mA max (VDD2 = 5 V)
• Side 1 logic input threshold: 500 mV min, 700 mV max
• Side 1 logic low output voltage: 600 mV min, 900 mV max (ISDA1 = ISCL1 = 3.0 mA)
• Side 2 logic low output voltage: 400 mV max (ISDA2 = ISCL2 = 30 mA)
• Side 2 logic input voltage high: 0.7 VDD2 min; low: 0.3 VDD2 max
• Input/output leakage currents: 0.01 μA typ, 10 μA max (all I/O lines at VDD)
• Common-mode transient immunity: 25 kV/μs min, 35 kV/μs typ

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
• Qualified for automotive applications
• Safety approvals including UL 1577 (2500 V rms for 1 minute) and DIN EN IEC 60747-17

Applications:

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

Package:

• 8-lead SOIC (narrow body [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 .