Liquid-crystal Display Drivers

The HCC4054B, HCC4055B and HCC4056B (ex- tended temperature range) and the HCF4054B HCF4055B and HCF4056B (intermediate tempera- ture range) aremonolithic integrated circuits available in 16-lead dual in-line plastic or ceramic package and plastic micro package. The HCC/HCF4055B and HCC/HCF4056B types are single-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 to VSS) to be the same as ordifferent fromthe 7-segment output-signal swings (VDD to VEE). For example, the BCD input-signal swings (VDD to VSS) may be as low as 0 to 3V, whereas the output-display drive-signal swing (VDD to VEE)may be from0 to 5V. If VDD toVEE exceeds 15V, VDD to VSS should be at least 4V. The 7-seg- ment outputs are controlled by the DISPLAY-FRE- QUENCY (DF) input which causes the selected segment outputs to be low, high, or a square-wave output (for liquid-crystal displays). When the DF input is low the output segments will be high when selected by the BCD inputs. When the DF input is high, the output segments will be low when selected by the BCD inputs. When a square-wave is present at the DF input, the selected segments will have a square-wave output that is 180 out of phase with 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 (well above flicker rate) to 200Hz (well below the upper limit of the liquid-crystal frequency re- sponse). The HCC/HCF4055B provides a level- shifted high-amplitude DF output which is required for driving the common electrode in liquid-crystal Displays The HCC/HCF4056B provides a strobed- latch function at the BCD inputs. Decoding of all input combinations on the HCC/HCF4055B and HCC/HCF4056B provides Displays of 0 to 9 as well as L, P, H, A, , and a blank position. (see typical ap- plication for other letters). The HCC HCF4054B pro- vides level shifting similar to the HCC/HCF4055B andHCC/HCF4056B independently strobed Latches 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 decimal point, colon,polarity, and similar Display lines. A level-shifted high-amplitude DF output CAN be ob- tainedfrom any HCC HCF4054B output line by con- necting the corresponding input and strobe lines to a low and high level, respectively. By STMicroelectronics
HCF4054B 's PackagesHCF4054B 's pdf datasheet

HCF4054B Pinout, Pinouts
HCF4054B pinout,Pin out
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