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LC74794 の電気的特性と機能

LC74794のメーカーはSanyo Semicon Deviceです、この部品の機能は「On-Screen Display Controller LSI」です。


製品の詳細 ( Datasheet PDF )

部品番号 LC74794
部品説明 On-Screen Display Controller LSI
メーカ Sanyo Semicon Device
ロゴ Sanyo Semicon Device ロゴ 




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LC74794 Datasheet, LC74794 PDF,ピン配置, 機能
Ordering number : EN*5557
CMOS LSI
LC74794, 74794M
On-Screen Display Controller LSI
Preliminary
Overview
The LC74794 and LC74794M are CMOS LSIs for on-
screen display, a function that displays characters and
patterns on a TV screen under microprocessor control.
They feature a built-in PDC/VPS/UDT interface circuit.
These LSIs 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
• 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
• Blanking: Over the whole font (12 × 18 dots)
• Background color
— Background coloring: 8 colors (internal synchronization
mode): 4fsc
— Background coloring: 6 colors (internal synchronization
mode): 2fsc
— Blue background only: NTSC
• Line background color
— Can be set for 3 lines
— Line background coloring: 8 colors (internal synchro-
nization mode): 4fsc
— Line background coloring: 6 colors (internal synchro-
nization mode): 2fsc
• External control input: 8-bit serial input format
• On-chip sync separator and AFC circuits
• PDC/VPS/UDT interface circuit
• Composite video output in the PAL or NTSC format
Package Dimensions
unit: mm
3196-DIP30SD
[LC74794]
unit: mm
3216A-MFP30S
[LC74794M]
SANYO: DIP30SD
SANYO: MFP30S
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
22897HA (OT)/No. 5557-1/30

1 Page





LC74794 pdf, ピン配列
LC74794, 74794M
Continued from preceding page.
Pin no. Pin
Function
9 CS1 Enable input 1
10 SCLK1 Clock input 1
11 SIN1 Data input 1
12 VDD2 Power supply
13 CPOUT Charge pump output
14 VCOIN Oscillator control voltage input
15 VSS3 Ground
16 VDD3 Power supply (+5 V)
17 VCOR Oscillator range adjustment
18 DAV Data present output
19 CVOUT Video signal output
20 VSS2 Ground
21 CVIN Video signal input
22 CVCR Video signal input
23 VDD1 Power supply (+5 V)
24 SYNIN Sync separator circuit input
25 SEPC Sync separator circuit adjustment
26 SEPOUT Composite synchronizing signal output
27 SEPIN Vertical synchronizing signal input
28 CDLR Background color phase adjustment
29 RST Reset input
30 VDD1 Power supply (+5 V)
Notes
Enable input for OSD serial data input
Serial data input is enabled by a low-level input.
(A pull-up resistor is built in so the input has hysteresis characteristics.)
Serial data clock input
(A pull-up resistor is built in so the input has hysteresis characteristics.)
Serial data input (A pull-up resistor is built in so the input has hysteresis characteristics.)
Composite video signal level adjustment power supply (analog system power supply)
The charge pump output. Connect a low-pass filter to this pin.
VCO control voltage input
Ground (VCO ground)
Power supply (+5 V: VCO power supply)
Connection for the VCO range adjustment resistor
Outputs a low level when PDC/VPS data has been received.
Composite video signal output
Ground (analog system ground)
Composite video signal input
SECAM chrominance signal input
Power supply (+5 V: digital system power supply)
Internal sync separator circuit video signal input
Internal sync separator circuit adjustment input
Composite synchronizing signal output for the built-in sync separator circuit. Can be
switched to function as an output for the signal (high or ST. pulse) due to MOD0 by setting
SEL0 high.
Inputs the vertical synchronizing signal created by integrating the SEPOUT pin output
signal.
An integration circuit must be connected to the SEPOUT pin. This pin must be tied to VDD1
if unused.
Background color phase adjustment resistor connection
System reset input
A pull-up resistor is built in so the input has hysteresis characteristics.
Power supply (+5 V: digital system power supply)
No. 5557-3/30


3Pages


LC74794 電子部品, 半導体
LC74794, 74794M
Figure 1 OSD Serial Data Input Timing
Note: DOUT goes to the high-impedance state while CS2 is high.
Figure 2 PDC/VPS Serial Output Test Conditions (For the n-channel open-drain output)
No. 5557-6/30

6 Page



ページ 合計 : 30 ページ
 
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共有リンク

Link :


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