TC7660的RS-232数据循环低成本转接器

Theintroductionofsingle-voltageEPROMSanddynamicRAMs

haspermitteddesignerstoproducecompletedigitalsystems

poweredbyasingle5Vsupply.Oneareawhichhasnotyielded

tosingle-supplyoperation,however,istheRS-232interface.Ifa

systemmustcommunicatewithanRS-232serialdevice,suchas

aprinteroranothercomputer,aseparatepowersupplyis

required.AN782TC7660PowersRS-232DataLoopLowCostAdapterTheRS-232inputvoltagespecis±3V.Theminimuminputresis-Author:WesFreeman,tanceoftheTC232,atypicalRS-232transceiver,isabout3k.MicrochipTechnology,Inc.Therefore,1mAofcurrentmustbesupplied,andR1mustbe: