HFC4054B

The HCC4054B, HCC4055B and HCC4056B (extended temperature range) and the HCF4054B, HCF4055B and HCF4056B (intermediate temperature range) aremonolithic integrated circuits available in 16-lead dual in-line plastic or ceramic package and plastic micro package. The HCC4054B, HCC4055B and HCC4056B types are single-digit BCD-to-7-segment decoder/driver circuits that provide level-shifting functions on the chip. This feature permits the BCD input-signal swings (V_DD to V_SS) to be the same asor different fromthe 7-segment output-signal swings (V_DD to V_EE). For example, the BCD input-signal swings (V_DD to V_SS) may be as low as 0 to 3V, whereas the output-display drive-signal swing (V_DD to V_EE)may be from 0 to 5V. If V_DD toV_EE exceeds 15V, V_DD to V_SS should be at least 4V. The 7-segment outputs are controlled by the DISPLAY-FREQUENCY (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 selected 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 response). The HCC/HCF4055B provides a levelshifted high-amplitude DF output which is required for driving the common electrode in liquid-crystal displays. The HCC/HCF4056B provides a strobedlatch function at the BCD inputs. Decoding of all input combinations on the HCC4054B, HCC4055B and HCC4056B provides displays of 0 to 9 as well