Dual Channel, 2/0, 1mbps Digital Isolator

  The ISO7220 and ISO7221 are dual-channel digital isolators. To facilitate PCB layout, the channels are oriented in the same direction in the ISO7220 and in opposite directions in the ISO7221. These devices have a logic input and output Buffer separated by TI?s silicon-dioxide (SiO2) isolation barrier, providing galvanic isolation of up to 4000 V. 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. 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 every 4 ?s, 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 small capacitance and resulting time constant provide very fast operation with signaling rates available from 0 Mbps (DC) to 150 Mbps. (1)The A- and C-option 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. The M-option devices have CMOS Vcc/2 input thresholds and do not have the input noise-filter and the additional propagation delay. 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. These devices are
Item: ISO7220A
File Size : 95 KB
Pages : 25 Pages

Other Part Numbers in this pdf file

ISO7221MDRG4   ISO7221MDR   ISO7221MDG4   ISO7221MD   ISO7221M   ISO7221CDRG4   ISO7221CDR   ISO7221CDG4   ISO7221CD   ISO7221C   ISO7221ADRG4   ISO7221ADR   ISO7221ADG4   ISO7221AD   ISO7221A   ISO7220MDRG4   ISO7220MDR   ISO7220MDG4   ISO7220MD   ISO7220M  
Texas Instruments Incorporated
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