TI CD4056BM96

CD4055B and CD4056B 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 (VDD to Vss) to be the same as or different from the 7-segment output-signal swings (VDD to VEE). For example, the BCD input-signal swings (VDD to VSS) may be as small as 0 to -3V, whereas the output-display drive-signal swing (VDD to VEE) may be as large as from 0 to -15V. VDD to VEE exceeds 15V, VDD to VSS should be at least 4V (0 to -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 squarewave 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 CD4055B provides a level-shifted high-amplitude DF output which is required for driving the common electrode in liquid-crystal displays. The CD4056B provides a strobed-latch function at the BCD inputs. Decoding of all input combinations on the CD4055B and CD4056B provides displays of 0 to 9 as well as L, P, H, A, -, and a blank position. The CD4054B provides level shifting similar to the CD4055B and CD4056B independently strobed latches, and common DF control on 4 signal lines. The CD4054B is intended to provide drive-signal compatibility with the CD4055B and CD4056B 7-segment decoder types for the decimal point, colon, polarity, and similar display lines.

• Operation of liquid crystals with CMOS circuits provides ultra-low-power displays
• Equivalent ac output drive for liquid crystal displays - no external capacitor require
• Voltage doubling across display, e.g. VDD - VEE = 18 V results in effective 36 V p-p drive across selected display segments
• Low- or high-output level dc drive for other types of displays
• On-chip logic-level conversion for different input- and output-level swings
• Full decoding of all input combinations: 0 - 9, L, H, P, A, -, and blank positions
• Strobed-latch function - CD4054B Series and CD4056B Series
• DISPLAY-FREQUENCY (DF) output for liquid-crystal common-line drive signal - CD4055B Series (CD4054B Series also: see introductory text)
• Tested for quiescent current at 20 V
• Maximum input current of 1 μA at 18 V over full package temperature range; 100 nA at 18 V and 25°C
• Noise margin (over full package temperature range): 1 V at VDD = 5 V, 2 V at VDD = 10 V, 2.5 V at VDD = 15 V
• 5-V, 10-V, and 15-V parametric ratings

• General-purpose displays
• Calculators and meters
• Wall and table clocks
• Industrial control panels
• Portable lab instruments
• Panel meters
• Auto dashboard displays
• Appliance control panels