The LC74788, LC74788M, and LC74788JM are on-screen display controller CMOS ICs that display characters and patterns on the TV screen under microprocessor control. These ICs support 12 × 18 dot characters and can display 12 lines by 24 characters of text.
The LC74788 series (LC74788, LC74788M, LC74788JM) are CMOS on‑screen display controller ICs that generate 12 × 18‑dot characters and can display up to 24 × 12 characters on a TV screen under microprocessor control. The devices support multiple video standards (NTSC, PAL variants) and provide eight‑bit serial control for character and display formatting.
The document provides detailed pin assignments, absolute maximum ratings, electrical and timing characteristics, a system block diagram, command tables for display control, and example application circuits using either an external system clock or a crystal oscillator.
| Operating temperature range | -30 °C to +70 °C |
|---|---|
| Typical supply voltage (Vpp1) | 5.0 V |
| Input high‑level voltage (Vih) | 0.7 Vpp1 |
| Number of characters in font | 128 characters |
| Display format | 24 × 12 characters (up to 288 characters) |
It operates from –30 °C up to +70 °C.
The controller can display up to 24 × 12 characters, a total of 288 characters.