ISO7241A Datasheet | Texas Instruments

.ti. Not Remended for New Designs ISO7240A ISO7241A ISO7242A SLLS905E - MAY 2008 - REVISED JANUARY 2010 1-Mbps QUAD DIGITAL ISOLATORS Check for Samples: ISO7240A, ISO7241A, ISO7242A Features 1 - 4000-Vpeak Isolation, 560-Vpeak VIORM - UL 1577 , IEC 60747-5-2 (VDE 0884, Rev 2), IEC 61010-1, IEC 60950-1 and CSA Approved - 4 kV ESD Protection - Operate With 3.3-V or 5-V Supplies - Typical 25-Year Life at Rated Working Voltage (See Application Note (SLLA197 ) and Figure 10) - High Electromagnetic Immunity (See Application Report (SLLA181)) - - 40°C to 125°C Operating Range APPLICATIONS - Industrial Fieldbus - puter Peripheral Interface - Servo Control Interface - Data Acquisition DESCRIPTION See the Product Notification section. The ISO7240A, ISO7241A and ISO7242A are quad-channel digital isolators 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 from entering the local ground and interfering with or damaging sensitive circuitry. The ISO7240A has all four channels in the same direction while the ISO7241A has three channels the same direction and one channel in opposition. The ISO7242A has two channels in each direction. The devices have TTL input thresholds and a noise-filter at the input that prevents transient pulses from being passed to the output of the device. A periodic update pulse is sent across the 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...