Overview

The LC74751 is a CMOS LSI that supports on-screen

display of characters and patterns on a TV screen under

the control of a microcontroller. The LC74751 includes an

on-chip character ROM that provides 128 characters in a

12

× 18 dot format. This IC supports display of up to 12

lines of 24 characters each for a maximum of 288

characters.

Features

• Display format: 24 characters by 12 rows

• Characters displayed: Up to 288 characters

• Display control ROM (line ROM): ROM for 64 lines

(Control in line units: lines consisting of 24 characters)

• Display RAM: 176 characters (Used for the specification

of user-defined characters.)

• Character format: 12 (horizontal)

× 18 (vertical) dots

• Characters in font: 128

• Character sizes: Four sizes each in the horizontal and

vertical directions

• Initial display positions: 64 horizontal positions and 64

vertical positions

• Blinking: Specifiable in character units

• Blinking types:

— Two periods supported: 1.0 second and 0.5 second

— Three duty types supported: 25%, 50%, and 75%

• Blanking: Over the whole font (12

× 18 dots)

• Background color

— 8 background colors (in internal synchronization

mode): 4fsc (NTSC/PAL/PAL-M/PAL-N)

— 4 background colors (in internal synchronization

mode): 2fsc (NTSC)

— Single background color (blue) (in internal

synchronization mode): 2fsc (PAL/PAL-M/PAL-N)

• External control input: Serial data input

• Synchronizing signals: Supports switching between

internal and external synchronizing signals.

• On-chip sync separator circuit

• Video output: Composite video output in the NTSC,

PAL, PAL-M, or PAL-N format

• Superimpose function: Superimposes the character

output on the composite video output.

Package Dimensions

unit: mm

3059-DIP22S

CMOS LSI

Ordering number : EN*5396

83096HA (OT) No. 5396-1/15

Preliminary

SANYO: DIP22S

[LC74751]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

On-Screen Display LSI

LC74751