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ISO722DR, 3.3V / 5V, High Speed Digital Isolator, 8 pin SOIC, Quantity 5, The ISO722 is a digital isolator with a logic input and output buffer separated by a silicon oxide (SiO2) insulation barrier. This barrier provides galvanic isolation of up to 4000 V. Used in conjunction with isolated power supplies, these devices prevent noise currents on a data bus or other circuits from entering the local ground, and interfering with or damaging sensitive circuitry. A binary input signal is conditioned, translated to a balanced signal, then differentiated by the capacitive isolation barrier. Across the isolation barrier, a differential comparator receives the logic transition information, then sets or resets a flip-flop and the output circuit accordingly. 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 for more than 4 µs, the input is assumed to be unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state. The symmetry of the dielectric and capacitor within the integrated circuitry provides for close capacitive matching, and allows fast transient voltage changes between the input and output grounds without corrupting the output. The small capacitance and resulting time constant provide for fast operation with signaling rates(1) from 0 Mbps (dc) to 100 Mbps. These devices require two supply voltages of 3.3-V, 5-V, or any combination. All inputs are 5-V tolerant when supplied from a 3.3-V supply and all outputs are 4-mA CMOS. The ISO722 devices include an active-low output enable that when driven to a high-logic level, places the output in a high-impedance state, and turns off internal bias circuitry to conserve power. The ISO722 has TTL input thresholds and a noise-filter at the input that prevents transient pulses of up to 2 ns in duration from being passed to the output of the device. * UL 1577, IEC 60747-5-2 (VDE 0884, Rev. 2) IEC 61010-1 * 50 kV/µs Transient Immunity Typical * Signaling Rate 0 Mbps to 150 Mbps * Low-Pulse Skew (Pulse-Width Distortion) * High-Electromagnetic Immunity * Low-Input Current Requirement * Drop-In Replacement for Most Opto and Magnetic Isolators * Smart Distributed Systems (SDS™) * Computer Peripheral Interface Click here to see the datasheet. Quantity 5 ..... New Parts !!!!! Be sure to add me to your favorites list! (all content is the responsibility of the poster) |
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