CD4056BE | Texas Instruments

LCD Decoder/Driver, CD4056BE, Texas Instruments

The CD4056BE is a single-digit BCD-to-7-segment decoder/driver circuit that provides 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 (VDD to VSS) may be as small as 0 to -3 V, whereas the output-display drive-signal swing (VDD to VEE) may be as large as from 0 to -15 V. If VDD to VEE exceeds 15 V, VDD to VSS should be at least 4 V (0 to -4 V). 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).

Features

• Operation of liquid crystals with CMOS circuits provides ultra-low-power displays
• Equivalent ac output drive for liquid-crystal displays - no external capacitor required
• On-chip logic-level conversion for different input- and output-level swings

Applications

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