ICOM-ICM7224维修手册

1IAXIV4%Digit Counter/Decoder/DriverGeneral DescriptionFeaturesThe Maxim ICM7224(LCD)and ICM7225(LED)areImproved 2nd Source!(See 3rd page for"Maximhigh speed 4%digit counters.featuring segmentAdvantage).decoders,leading zero blanking,store and reset inputs.and a carry output that allows cascading of 8 or moreHigh Speed Up Counter:25MHz Typ.digits.The ICM7224 directly drives a non-multiplexedLeading Zero Blankingliquid crystal display(LCD).The ICM7225 has 29 con-SCan Be Cascaded for 8 or More Digitsstant current outputs for driving a non-multiplexedcommon anode LED display.STORE and RESET Inputs for FrequencyThese counters operate with inputs from DC to 25MHzCounter Applicationswhile using only 10uA of supply current.A SchmittOn-Board Oscillator to Provide Backplanetrigger on the count input ensures reliable operation inFrequency (ICM7224)4V7225noisy environments and in applications with slowlyBrightness Control Input (ICM7225)varying inputs.The ICM7224 and ICM7225 are available in a 44 leadLow Power CMOSplastic chip carrier package in addition to the standard40 lead plastic DIPOrdering InformationPARTTEMP RANGEPACKAGEApplicationsCM7224IPL-20°Cto+85°C40 Lead Plast1icD1FUnit CounterICM7224CQ 0C to +70C 44 Lead Plastic Chip CarrierFrequency CounterTachometer1CM7224C/D0°Cto+70°C DiceHour MeterICM7225IPL-20°Cto+85°C40 Lead P1 astic DIPTotalizerICM7225CQ oC to +70C 44 Lead Plastic Chip Carrier1CM7225C/D0°Cto+70°C DicePin ConfigurationTop ViewTypical Operating Circuit可01四1GI3▣81刀A18R西OSCILLAT0RGNU355-C2RESETMAXI/COUNTC87224面COUNT INHIBIT1CM7225)LZB OUT18888RESETLZBA3▣☒CARRYC0NM.A0083a2四9-061TLEO DSPL群CM722512IMHOIT3四E41e08F0丽F3A4Unit CounterSee Last Page for 44 Lead Chip Carrier Pin Configuration.月XIVIMaxim Integrated Products 1