Overview
The LC7940YC and LC7941YC are segment driver ICs for driving large, dot–matrix LCD displays. They read 4– bit parallel or serial input, display data from a controller into an 80–bit latch, and then generate LCD drive signals corresponding to that data.
The LC7940YC and LC7941YC feature mirror–image pin assignments, allowing them to be used together to increase component density. They are designed to be used with the LC7942YC common driver to drive large LCD panels.

Features
• 80 built–in LCD display drive circuits
• 1/8 to l/128 display duty cycle
• Serial or 4–bit parallel data input
• Chip disable for low power dissipation for large–sized panels
• Bias supply voltags can be supplied externally
• Operating supply voltage and ambient temperature
    - 2.7 to 5.5 V logic supply ( VDD) at Ta = –20 to +85°C
    - 8 to 20V LCD supply (VDD – VEE ) at Ta = –20 to +85 °C
• CMOS process