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Sanyo Electric Components Datasheet

LC74788M Datasheet

On-Screen Display Controller

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LC74788M pdf
Ordering number : EN5731A
CMOS IC
LC74788, 74788M, 74788JM
On-Screen Display Controller
Overview
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.
Features
• Display format: 24 characters by 12 rows (Up to 288
characters)
• Character format: 12 (horizontal) × 18 (vertical) dots
• Character sizes: Three sizes each in the horizontal and
vertical directions
• Characters in font: 128 (128 characters, one spacing
character, and one transparent spacing character)
• Initial display positions: 64 horizontal positions and 64
vertical positions
• Blinking: Specifiable in character units
• Blinking types: Two periods supported: About 1.0
second and about 0.5 second
• Blanking: Over the whole font (12 × 18 dots)
• Background color: 8 colors (internal synchronization
mode): 2fSC and 4fSC
• Line background color
— Can be set for 3 lines
— Line background color: 8 colors (internal
synchronization mode): 2fSC and 4fSC
• External control input: 8-bit serial input format
• On-chip sync separator circuit
• Video outputs - NTSC, PAL, PAL-N, PAL-M, NTSC
4.43, and PAL60 format composite video outputs
• Package
— 24-pin plastic DIP-24S (300 mil)
— 24-pin plastic MFP-24 (375 mil)
— 24-pin plastic MFP-24S (300 mil)
Package Dimensions
unit: mm
3067-DIP24S
[LC74788]
unit: mm
3045B-MFP24
[LC74788M]
unit: mm
3112-MFP24S
[LC74788JM]
SANYO: DIP24S
SANYO: MFP24
SANYO: MFP24S
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
30698HA (OT) No. 5731-1/23


Sanyo Electric Components Datasheet

LC74788M Datasheet

On-Screen Display Controller

No Preview Available !

LC74788M pdf
Pin Assignment
LC74788, 74788M, 74788JM
LC74788
LC74788M
LC74788JM
Pin Functions
A08688
Pin no.
1
2
3
Pin
VSS1
XtalIN
XtalOUT
(MUTE)
Function
Ground
Crystal oscillator
(MUTE input)
CTRL1 Crystal oscillator input switching
4 (CHABLK)
(CHABLK output)
5 HFTONOUT
6 OSCIN
7 OSCOUT
Background line output
LC oscillator
External synchronizing signal
8 SYNCJDG
judgment output
9 CS
10 SCLK
11 SIN
12 VDD2
Enable input
Clock input
Data input
Power supply
Notes
Ground connection (digital system ground)
These pins are used either to connect the crystal and capacitors used to form an external
crystal oscillator circuit to generate the internal synchronizing signals, or to input an external
clock signal (2fsc or 4fsc). As a mask option, the XtalOUT pin can be set to function as the
MUTE input pin. When this pin is set low, the video output is held at the pedestal level. (A pull-
up resistor is built in and the input has hysteresis characteristics.)
Switches the mode between external clock input and crystal oscillator operation. A low level
selects crystal oscillator operation and a high level selects external clock input. As a mask
option, the CTRL1 input pin can be set to function as the CHABLK (character · frame) output.
This is a 3-value output.
Outputs the range signal specified by LNA*, LNB*, and LNC*. Outputs the crystal oscillator
clock when RST is low. (This signal is not output after a reset command is executed.)
Connections for the inductor and capacitor that form the character output dot clock generation
oscillator.
Outputs the state of the external synchronizing signal presence/absence judgment. Outputs a
high level when synchronizing signals are present.
Outputs the dot clock (LC oscillator) when RST is low. (This signal is not output on command
resets.)
Serial data input circuit enable pin. Serial data input is enabled when a low level is input.
A pull-up resistor is built in. (This input has hysteresis characteristics.)
Serial data input circuit clock input.
A pull-up resistor is built in. (This input has hysteresis characteristics.)
Serial data input.
A pull-up resistor is built in. (This input has hysteresis characteristics.)
Composite video signal level adjustment power supply (analog system power supply)
Continued on next page.
No. 5731-2/23


Part Number LC74788M
Description On-Screen Display Controller
Maker Sanyo Semicon Device
Total Page 23 Pages
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