Overview
The ADUM2251ARIZ is a digital isolator produced by Analog Devices Inc., designed for bidirectional I2C communication. This component is part of the ADuM2250/ADuM2251 series, which offers non-latching, bidirectional communication channels compatible with I2C interfaces. It eliminates the need for splitting I2C signals into separate transmit and receive signals, making it ideal for applications requiring galvanic isolation.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Minimum Operating Supply Voltage | 3.0 | V | |
| Maximum Operating Supply Voltage | 5.5 | V | |
| Package Type | 16-lead SOIC wide body | RW-16 or RI-16-2 for enhanced creepage | |
| Maximum Operating Temperature | 105 | °C | |
| Current Sink Capability | 30 mA | ||
| Operation Frequency | 1000 kHz | ||
| Isolation Voltage | 5000 V rms | UL recognition per UL 1577, CSA, IEC 60601-1, and IEC 60950-1 | |
| Input to Output Resistance | 1012 Ω | ||
| Input to Output Capacitance | 2.2 pF | f = 1 MHz | |
| Input Capacitance | 4.0 pF | ||
| Junction to Ambient Thermal Resistance | 45 °C/W | Thermocouple located at center of package underside |
Key Features
- Bidirectional I2C communication
- Open-drain interfaces
- Suitable for hot swap applications
- 30 mA current sink capability
- 1000 kHz operation frequency
- 3.0 V to 5.5 V supply/logic levels
- High temperature operation up to 105°C
- Safety and regulatory approvals including UL, CSA, IEC 60601-1, and IEC 60950-1
Applications
- Isolated I2C, SMBus, or PMBus interfaces
- Multilevel I2C interfaces
- Power supplies
- Networking
- Power over Ethernet (PoE)
Q & A
- What is the ADUM2251ARIZ used for?
The ADUM2251ARIZ is used for bidirectional I2C communication in applications requiring galvanic isolation, such as isolated I2C, SMBus, or PMBus interfaces, power supplies, networking, and Power over Ethernet.
- What are the key features of the ADUM2251ARIZ?
The key features include bidirectional I2C communication, open-drain interfaces, suitability for hot swap applications, 30 mA current sink capability, and operation up to 1000 kHz.
- What is the operating temperature range of the ADUM2251ARIZ?
The ADUM2251ARIZ can operate up to a maximum temperature of 105°C.
- What are the safety and regulatory approvals for the ADUM2251ARIZ?
The component has approvals including UL recognition per UL 1577, CSA Component Acceptance Notice 5A, IEC 60601-1, and IEC 60950-1.
- What is the isolation voltage of the ADUM2251ARIZ?
The isolation voltage is 5000 V rms.
- What package types are available for the ADUM2251ARIZ?
The component is available in 16-lead SOIC wide body packages (RW-16 and RI-16-2 for enhanced creepage).
- Is the ADUM2251ARIZ RoHS compliant?
Yes, the ADUM2251ARIZ is RoHS compliant.
- How does the ADUM2251ARIZ prevent bus contention and latch-up?
The component prevents bus contention and latch-up by ensuring that only externally generated input signals are transferred across the isolator, and by implementing a dual input/output threshold detection scheme on one side of the isolator.
- Can multiple ADUM2251ARIZ components coexist on the same bus?
Yes, multiple components can coexist as long as two Side 1 buffers are not connected to the same bus segment.
- What is the warranty period for the ADUM2251ARIZ from authorized distributors?
The warranty period can vary depending on the distributor, but typically includes a 1-year warranty covering defects in materials and workmanship under normal use.
