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ISO508 is an 8-channel, isolated, digital coupler based on the Burr-Brown capacitive barrier technology. The ISO508 has additional circuitry to ensure DC accuracy and overcome the edge-sensitive nature of normal capacitive devices even on power-up conditions. The novel circuitry involved will restore the correct output after a transient interruption should that be necessary.
The ISO508 is designed with input and output buffers for ease of integration into a mP bus system. The output buffer has tri-state capability, and by the use of OE, the output data bus lines can be made to go high impedance. This feature of the ISO508, which allows multiple access to a data bus, requires extra circuitry when using an alternative solution.
ISO508 will transfer an 8-bit word at rates up to 2Mwords/s without the skew problems associated in implementing this function with optocouplers. The ISO508 is available in 24-pin PDIP or 24-pin Gull Wing packages. Both are specified for operation from 40°C to +85°C.
ISO508 Maximum Ratings
Supply Voltage: VSA ............................................................. 0.5V to +6V VSB ............................................................. 0.5V to +6V Maximum Input Current, any Input Pin ............................................ 20mA Continuous Isolation Voltage .................................................... 1500Vrms Storage Temperature .................................................... 40°C to +125°C Lead Temperature (soldering, 10s) .............................................. +260°C
ISO508 Features
` LOW POWER CONSUMPTION: < 12mW per Channel Typ. ` 1500Vrms ISOLATION: 100% Tested by Partial Discharge ` ASYNCHRONOUS OR SYNCHRONOUS OPERATION ` DOUBLE BUFFERED DESIGN FOR EASY INTEGRATION INTO BUS-BASED SYSTEMS ` TRI-STATE OUTPUTS ` 24-PIN PDIP OR GULL WING PACKAGES ` 2MWORDS/SEC TRANSFER RATE ` 1SEC TRANSIENT RECOVERY
ISO508 Typical Application
· PARALLEL ADCs/DACs · DIGITAL INTERFACES · DIGITAL TRANSMISSION · GROUND-LOOP ISOLATION