Dynamic Shift Registers - Bitsavers - Trailing-Edge

ROM Code Converte rsMM4220AE/MM5220AE ASCII-7 to hollerith code converter3:3:~NNo»m.......3:3:U'INNo»mgeneral descriptionThe MM4220AE/MM5220AE 1024-bit read-onlymemory has been programmed to convert the128 entries of the American Standard Code forInformation Interchange in seven bits (ASCII-7) toHollerith code (compressed to eight bits). Theconversion performed follows the .recommendationof American National Standard ANSI x 3.26-1970, Hollerith punched card code.The typical application shows a recommendedcircuit for re-expansion of the Hollerith code totwelve lines.For electrical, environmental and mechanical details,refer to the MM4220/MM5220 data sheet.typical applicationASCII·}INPUTS~---'l-----------------------------OM8810 ~8rOM8812_I~_~~ __.-~A~'r.'-"~·~~I1~111" ..!.....j________--1rb,..b,lDti~ LeVI.OTLmL!eIlCI!ItIlMOS/ROMilllelllee)Lillie "1",+IiV,NOM,Llllic"lI"llound,NOMMOSlAOMinpllb.ndautpuU""',r r-IO ~'r""----I________--'r- ......»-----t-""""""'t Ae 20 rMt'!522DAE a 1"""----1----------'UKTYPICAL ~-1UNES" "A, • B,v..B,.. 2V-------~ .....-...:ft,~, ~.!,!-~j. ~B'~-----------J1111111-t~~4,LOIIic ",",mol1lnep1ive,logic"O", mOllplllitive·CH",ENABLEPUNCHROW,.--------------------"OM1442, 0,0__, '0--'.0--',0--,,0__'' 0--'.. j,'-------·..J0-- ,'5 1& l HOLLERITH PUNCH COMMANDS.1ZV (ACTIVE LEVEL: lOW-PUNCH)I·ChipElllble'" logic "1" to abllin DUIpUUFAN OUT AVAILABLE1 TTl lOAD1FAN OUT AVAILABLEIOTTLLOAOS181