HCC4056B

Pinout

 

Specifications

Symbol	Parameter	Value	Unit
VDD*	Supply Voltage :HCC Types HCF Types	0.5 to + 20 0.5 to + 18	V V
Vi	Input Voltage	0.5 to V + 0.5	V
II	DC Input Current (any one input)	± 10	mA
Ptot	Total Power Dissipation (per package) Dissipation per Output Transistor for Top = Full Package-temperature Range	200 100	mW mW
Top	Operating Temperature : HCC Types HCF Types	55 to + 125 40to+85	°C °C
Tstg	Storage Temperature	65 to + 150	°C

Description

The HCC/HCF4055B and HCC/HCF4056B  (intermediate temperaturerange)aremonolithicintegratedcircuitsavailable in16-lead dualin-lineplastic orceramic packageand plastic micro package. The HCC/HCF4055B and HCC/HCF4056B typesaresingle-digit BCD-to-7-seg-ment decoder/driver circuits that provide level-shifting functions on the chip. This feature permits the BCD input-signal swings(VDD toVSS) tobe thesame as ordifferentfromthe7-segmentoutput-signalswings (VDD to VEE). For example, the BCD input-signal swings (VDD to VSS) may be as low as 0 to 3V, whereasthe output-display drive-signal swing(VDD toVEE)maybefrom0to5V.IfVDD toVEEexceeds 15V,VDD to VSS should be atleast 4V.The 7-seg- ment outputsarecontrolled by theDISPLAY-FRE- QUENCY (DF) input which causes the selected segmentoutputsto below,high,or asquare-wave output (for liquid-crystal displays). When the DF inputis low the output segments will be highwhen selectedby the BCD inputs. When the DF input is high, theoutputsegmentswillbelowwhenselected by theBCDinputs. When asquare-wave ispresent at the DF input,the selected segments willhave a square-wave output thatis 180° outof phasewith the DF input. Those segments which are not se- lected will have a square-wave output that is in phase with the input. DF square-wave repetition rates for liquid-crystal displays usually range from 30Hz(wellabove flickerrate)to200Hz(wellbelow the upper limit of the liquid-crystal frequency response). The HCC/HCF4055B provides a levelshifted high-amplitude DF outputwhich is required for driving the common electrode in liquid-crystal displays. TheHCC/HCF4056Bprovides a strobed latch function at the BCD inputs. Decoding of all input combinations on the HCC/HCF4055B and HCC/HCF4056Bprovides displays of 0to 9aswell asL, P,H,A,,andablank position.(seetypicalapplication forother letters).TheHCC/HCF4054Bprovides level shifting similar to the HCC/HCF4055B and HCC/HCF4056B  independently strobedlatches, and common DF control on 4 signal lines. The HCC/HCF4054B is intended to provide drive-signal compatibility with the HCC/HCF4055B and HCC/HCF4056B 7-segment decoder types for the decimalpoint,colon,polarity,andsimilardisplaylines. Alevel-shiftedhigh-amplitude DF output canbe obtained from any HCC/HCF4054B output line by connecting the corresponding inputand strobelinesto a low and high level, respectively. The HCC/HCF4054B mayalso beutilized for logic-level "upconversion"or"downconversion". Forexample, input-signal swings (VDD toVSS) from+5to 0V can beconvertedtooutput-signalswings(VDD toVEE)of + 5 to 5V. The level-shifted function on all three typespermits the use of differentinput-and outputsignalswings. The inputswingsfrom a lowlevel of VSS to a high level of VDD while the outputswings fromalowlevelofVEE tothesame highlevelofVDD. Thus,the inputand output swingscan be selected independently of each otherovera3-to-18V range. VSS may be connected to VEE when no level-shift function isrequired. For the HCC/HCF4055B and HCC/HCF4056B , dataaretransferredfrominput to outputbyplacing a high voltage levelat the strobe input.Alowvoltagelevelat thestrobeinput latches the data input and the corresponding output seg- ments remain selected (or non-selected) whilethe strobe is low.Whenever the level-shiftingfunction isrequired, the HCC/HCF4055B and HCC/HCF4056B  can be used by it selfto drive a liquid-crystal display(fig. 10 and fig. 12).The HCC/HCF4056B, however,must be used together with a HCC/HCF4055B and HCC/HCF4056B  to providethecommon DF output(fig. 14).Thecapability of extending hevoltage swingon thenegative end(thisvoltage cannot be extended on the positive end) can be used to advantagein theset-upof fig.11. Fig.9 is commonto allthreetypes.