ADuM1254
RECOMMENDED FOR NEW DESIGNSBidirectional I2C Isolator with Idle-Bus Hot Swap and Low VOL
- Part Models
- 4
- 1ku List Price
- Starting From $1.29
Overview
- Low VOL(MAX) for Greater I2C Device Compatibility
- Side 1: 0.69V
- Side 2: 0.4V
- Independent VDD1/VDD2 Supplies Supports 3.3V and 5V Logic Voltage Levels and Allows Level Shifting
- 2.25V to 5.5V for Both Sides
- Enhanced Hot Swappable Side 2 I/Os
- Initial Side 2 Connection Occurs at Bus Idle or Stop States to Prevent Data Corruption
- Bidirectional I2C Data Transfer up to 2MHz SCL
- Bidirectional SCL for Advanced Bus Topologies
- Supports Clock Stretching and Multiple Controllers Across Isolation Barrier
- Strong Current Sinking Enables Lower RPULL-UP Values for Faster Bus Speeds
- Side 1: 5mA
- Side 2: 50mA
- Robust Galvanic Isolation of Digital Signals
- Continuously Withstands (VIOWM)
- 8 Narrow SOIC: 445VRMS
- 8-Wide SOIC: 848VRMS
- 8 Narrow SOIC: 4mm
- 8-Wide SOIC: 8mm
- IEC 60747-17 (Pending)
- Reinforced VIORM Narrow SOIC: 630VPEAK
- Reinforced VIORM Wide SOIC: 1200VPEAK
- UL 1577 (Pending)
- 8 Narrow SOIC: 3000VRMS for 1min
- 8-Wide SOIC: 5000 VRMS for 1min
- IEC/EN/CSA 62368-1 (Pending)
- IEC/EN/CSA 61010-1 (Pending
- CAN/CSA-C22.2 No. 14-18 (Pending)
The ADuM1254 offers two bidirectional, open-drain channels for applications, such as I2C, that require data to be transmitted in both directions on the same line. To prevent latch-up action, side 1 outputs comprise special buffers that regulate the logic-low voltage at 0.64V and the input logic-low threshold is at least 50mV lower than the output logic-low voltage. Side 2 features conventional buffers that do not regulate logic-low output voltage.
The ADuM1254 features independent 2.25V to 5.5V supplies on both side 1 and side 2 of the isolator. The device operates up to 2MHz.
The ADuM1254 provides a disturbance-free bus connection for hot-plug connections on side 2 by first precharging the bus pins and then monitoring the bus state for either an idle bus or detection of a I2C stop condition before connecting side 1 and side 2. The ADuM1254 is available in an 8-pin narrow-body SOIC package. The device is rated for operation at ambient temperatures of -40°C to +125°C.
Applications
- Isolated I2C/SMBus Interface
- Battery Management Systems
- Power Over Ethernet (PoE)
- Motor Control Systems
Documentation
Data Sheet 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| ADUM1254ASA+ | S8MS+24A | ||
| ADUM1254ASA+T | S8MS+24A | ||
| ADUM1254AWA+ | SOIC_W | ||
| ADUM1254AWA+T | SOIC_W |
This is the most up-to-date revision of the Data Sheet.
Tools & Simulations
IBIS Model 1
Evaluation Kits
Evaluates: ADuM1252, ADuM1253, ADuM1254, ADuM1255