LC74751 Datasheet, PDF (1/15 Pages) Sanyo Semicon Device – On-Screen Display LSI

Ordering number : EN*5396
CMOS LSI
LC74751
On-Screen Display LSI
Preliminary
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
[LC74751]
SANYO: DIP22S
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
83096HA (OT) No. 5396-1/15