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ISO721MDRG4 Datasheet(PDF) 1 Page - Texas Instruments |
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ISO721MDRG4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 37 page OUT GND2 GND1 IN VCC2 VCC1 Isolation Capacitor EN (ISO722/M-only) Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design ISO721, ISO721M, ISO722, ISO722M SLLS629L – JANUARY 2006 – REVISED OCTOBER 2015 ISO72x Single Channel High-Speed Digital Isolators If this dc-refresh pulse is not received for more than 4 1 Features μs, the input is assumed to be unpowered or not 1 • 100 and 150-Mbps Signaling Rate Options being actively driven, and the failsafe circuit drives • Low Propagation Delay the output to a logic-high state. • Low Pulse Skew The symmetry of the dielectric and capacitor within • Low-Power Sleep Mode the integrated circuitry provides for close capacitive matching, and allows fast transient voltage changes • High Electromagnetic Immunity between the input and output grounds without • Low Input-Current Requirement corrupting the output. The small capacitance and • Failsafe Output resulting time constant provide for fast operation with signaling rates from 0 Mbps (DC) to 100 Mbps for the • Drop-In Replacement for Most Opto and Magnetic ISO721 and the ISO722 devices, and 0 Mbps to 150 Isolators Mbps with the ISO721M and the ISO722M devices. • Operates from 3.3 V and 5 V Supplies These devices require two supply voltages of 3.3 V, 5 • -40°C to 125°C Operating Temperature Range V, or any combination. All inputs are 5-V tolerant • 50 kV/µs Transient Immunity, Typical when supplied from a 3.3-V supply and all outputs • Safety and Regulatory Approvals are 4 mA CMOS. – VDE Basic Insulation with 4000-VPK VIOTM, 560 The ISO722 and ISO722M devices include an active- VPK VIORM low output enable that when driven to a high logic – 2500 VRMS Isolation per UL 1577 level, places the output in a high-impedance state and turns off internal bias circuitry to conserve power. – CSA Approved for Component Acceptance Notice 5A and IEC 60950-1 Both the ISO721 and ISO722 devices have TTL input thresholds and a noise filter at the input that prevent 2 Applications transient pulses of up to 2 ns in duration from being passed to the output of the device. • Industrial Fieldbus The ISO721M and ISO722M devices have CMOS – Modbus VCC / 2 input thresholds, but do not have the noise- – Profibus filter and the additional propagation delay. These – DeviceNet™ Data Buses features of the ISO721M device also provide for reduced-jitter operation. – Smart Distributed Systems (SDS™) • Computer Peripheral Interface The ISO721, ISO721M, ISO722, and ISO722M devices are characterized for operation over the • Servo Control Interface ambient temperature range of –40°C to 125°C. • Data Acquisition Device Information(1) 3 Description PART NUMBER PACKAGE BODY SIZE (NOM) The ISO721, ISO721M, ISO722, and ISO722M are ISO721 SOP (8) 9.50mm x 6.57mm digital isolators with a logic input and output buffer ISO721 separated by a silicon dioxide (SiO2) insulation ISO721M barrier. This barrier provides galvanic isolation of up SOIC (8) 4.90mm x 3.91mm to 4000 VPK per VDE. Used in conjunction with ISO722 isolated power supplies, these devices prevent noise ISO722M currents on a data bus or other circuits from entering (1) For all available packages, see the orderable addendum at the local ground, and interfering with or damaging the end of the datasheet. sensitive circuitry. A binary input signal is conditioned, translated to a Simplified Schematic 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. 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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