11.07.2015 Views

Dynamic Shift Registers - Bitsavers - Trailing-Edge

Dynamic Shift Registers - Bitsavers - Trailing-Edge

Dynamic Shift Registers - Bitsavers - Trailing-Edge

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ROM Code ConvertersMM4220AP/MM5220APBCDIC-to-ASCII code convertergeneral descriptionThe MM4220AP/MM5220AP is used for the conversionof the Binary Coded Decimal InterchangeCode(BCDIC) to the American Standard Code forInformation Interchange (ASCII).The input is a seven-bit BCDIC code with theexception of the parity (check) bit (pin 18) whichis returned to +12V dc. The alternate set of inputsymbols is also shown in the Conversion Table forreference.The output is a seven-bit ASCII code, with aneighth bit generated for even parity.device characteristicsFor full electrical, environmental, and mechanicaldetails, refer to the MM4220/MM5220 1024-bitread only memory data sheet.typical applicationconnection diagram-1ZV----------------+~._...,~V--~-------~~---~~~~-~._---~ .8!;~ 8C(NOT USED)A,A,A,A,"A,20A, "A7 183.0K,TYPICAL,JLlNESV"+12V-----4I...-....... ~ 1ZtAo24VDO·CHIPENABLE---....MM4220AP/1'IM5220APtMODE CONTROl------'VGG17B,S B,B,B.7I I,• B.B,10B.11UK,TYPICAL,a LINESGATES DM7400DTL/TTL lOGIC"V __A, N.C.A, N.C,B, A,.. A,B, ..B. A,a. 17 VGGa.,. MODE.. 11CONTROLa, ,. CHIPENAILEV"..12 N.C.TO' VIEWlogic LevelsDTl/TTL (except at MOS/ROM interface)Lup: "1", +5V, nam. LOIic "11", .. au., nOIl1.MOS/ROM Inputs & OutputLogic",",morenaptive.lDlic"O",m .. pDlitivetModl Cuntrol = Logil:"O"Aa=Logit"t"-Chip Enable ~ Lotic "I" to Dbtlin olltputs183

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