ایزولاتور ایزولاتور دیجیتال

Product Attributes

Introduction

The MAX22444–MAX22446 are reinforced, fast, lowpower 4-channel digital galvanic isolators using Maxim’s proprietary process technology. These devices transfer digital signals between circuits with different power domains, using as little as 0.74mW per channel at 1Mbps (1.8V supply). All of the devices in the family feature reinforced isolation for a withstand voltage rating of 5kVRMS for 60 seconds. The MAX22444–MAX22446 family offers all possible unidirectional channel configurations to accommodate any 4-channel design, including SPI, RS-485, and digital I/O applications. Output enable for the A side of the MAX22445R/S/U/V is active-low, making them ideal for isolating a port on a shared SPI bus since the CS signal can directly enable the MISO signal on the isolator. All other output enables in the MAX22444-MAX22446 family are the traditional active-high. All channels on the MAX22444–MAX22446M/N are always enabled, however, the default state of the outputs of these devices is selectable. Devices are available with a maximum data rate of either 25Mbps or 200Mbps, and with outputs that are either default-high or default-low. The default is the state the output assumes when the input is either not powered or is opencircuit. Independent 1.71V to 5.5V supplies on each side of the isolator also make the devices suitable for use as level translators. All of the devices in the MAX22444–MAX22446 family are available in a 16-pin wide-body SOIC package with 8mm of creepage and clearance. The package material has a minimum comparative tracking index (CTI) of 400, which gives it a group II rating in creepage tables. All devices are rated for operation at ambient temperatures of -40°C to +125°C.

Features

• Reinforced Galvanic Isolation for Fast Digital Signals
• Up to 200Mbps Maximum Data Rate
• Withstands 5kVRMS for 60s (VISO)
• Continuously Withstands 1500VRMS (VIOWM)
• Withstands ±12.8kV Surge Between GNDA and GNDB with 1.2/50μs waveform
• High CMTI (50kV/μs, Typical)
• Low Power Consumption
• 0.74mW per Channel at 1Mbps with VDD = 1.8V
• 1.4mW per Channel at 1Mbps with VDD = 3.3V
• 3.2mW per Channel at 100Mbps with VDD = 1.8V
• Options to Support a Broad Range of Applications
• 2 Maximum Data Rates (200Mbps, 25Mbps)
• 3 Direction Configurations
• Active-High or Active-Low Enable Inputs
• 2 Fixed Output Default States (High/Low) or PinSelectable (M/N Versions)

Applications

• Isolated SPI Interface
• Fieldbus Communications for Industrial Automation
• Isolated RS-485/RS-422, CAN
• Battery Management
• Medical Systems