ISO7231ADWR

The ISO7230A and ISO7231A are triple-channel digital isolators each with multiple channel configurations and output-enable functions. These devices have logic input and output buffers separated by TI’s silicon dioxide (SiO₂) isolation barrier. Used in conjunction with isolated power supplies, these devices block high voltage, isolate grounds, and prevent noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry. The ISO7230 triple-channel device has all three channels in the same direction while the ISO7231 has two channels in one direction and one channel in opposition. These devices have an active-high output enable that when driven to a low level, places the output in a high-impedance state. The ISO7230A and ISO7231A have TTL input thresholds and a noise-filter at the input that prevents transient pulses of up to 2ns in duration from being passed to the output of the device. In each device a periodic update pulse is sent across the isolation barrier to ensure the proper dc level of the output. If this dc-refresh pulse is not received, the input is assumed to be unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state. (Contact TI for a logic low failsafe option). These devices require two supply voltages of 3.3V, 5V, or any combination. All inputs are 5V tolerant when supplied from a 3.3V supply and all outputs are 4mA CMOS. These devices are characterized for operation over the ambient temperature range of -40°C to 125°C.

Applications

• Industrial Fieldbus
• Computer Peripheral Interface
• Servo Control Interface
• Data Acquisition

Key features

• 1Mbps Signaling Rate
• Low Channel-to-Channel Output Skew; 2ns Maximum (5V-Operation)
• Low Pulse-Width Distortion (PWD); 10ns Maximum (5V-Operation)
• Typical 25-Year Life at Rated Working Voltage
• High Electromagnetic Immunity
• -40°C to 125°C Operating Range