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PDF LC74785 Data sheet ( Hoja de datos )
| Número de pieza | LC74785 | |
| Descripción | On-Screen Display Controller LSI | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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Ordering number : EN5520A
CMOS LSI
LC74785, LC74785M
On-Screen Display Controller LSI
Overview
The LC74785 and LC74785M are on-chip EDS CMOS
LSIs for on-screen display, a function that displays
characters and patterns on a TV screen under
microprocessor control. 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: About 1.0
second and about 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
• 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 circuit
• EDS support
• Video output
— NTSC-format composite output
• Package
24-pin plastic DIP (300 mil)
24-pin plastic SOP (375 mil)
Package Dimensions
unit: mm
3067-DIP24S
[LC74785]
unit: mm
3045B-MFP24
[LC74785M]
SANYO: DIP24S
SANYO: MFP24
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
63097HA (OT) No. 5520-1/24
1 page  
LC74785, LC74785M
Timing Characteristics at Ta = –30 to +70°C, VDD1 = 5 ±0.5 V
OSD write (See Figure 1.)
Parameter
Minimum input pulse width
Data setup time
Data hold time
One word write time
Symbol
Conditions
tW(SCLK)
tW(CS1)
tSU(CS1)
tSU(SIN)
th(CS1)
th(SIN)
tword
twt
SCLK
CS1 (The period when CS1 is high)
CS1
SIN
CS1
SIN
The time to write 8 bits of data
The RAM data write time
EDS read (For the n-channel open-drain circuit, see Figure 2.)
Parameter
Symbol
tCKCY
Minimum input pulse width
tCKL
tCKH
Setup time
tICK
Output delay time
tCKO
Note: The CMOS output circuit follows the OSD timing.
SCLK
SCLK
SCLK
SCLK
CPDT
Conditions
min
200
1
200
200
2
200
4.2
1
Ratings
typ
max
Unit
ns
µs
ns
ns
µs
ns
µs
µs
min
2
1
1
10
Ratings
typ
max
0.5
Unit
µs
µs
µs
µs
µs
First byte
Second byte
Figure 1 OSD Serial Data Input Timing
Note: CPDT goes to the high-impedance state when CS2 is high.
Figure 2 EDS Serial Output Test Conditions (For the n-channel open-drain circuit.)
No. 5520-5/24
5 Page 
LC74785, LC74785M
COMMAND0 (Display memory write address setup command)
First byte
DA
0 to 7
7
6
5
4
3
2
1
0
Register
—
—
—
—
V3
V2
V1
V0
State
1
0
0
0
0
1
0
1
0
1
0
1
Contents
Function
Command 0 identification code
Sets the display memory write address.
Display memory line address (0 to B hexadecimal)
Second byte
DA
0 to 7
7
6
5
4
3
2
1
0
Register
—
—
—
H4
H3
H2
H1
H0
State
0
0
0
0
1
0
1
0
1
0
1
0
1
Contents
Function
Second byte identification code
Display memory column address (0 to 17 hexadecimal)
Note: All registers are set to 0 when the LC74785/M is reset by the RST pin.
COMMAND1 (Display character data write setup command)
First byte
DA
0 to 7
7
6
5
4
3
2
1
0
Register
—
—
—
—
—
—
—
—
State
1
0
0
1
0
0
0
0
Contents
Function
Command 1 identification code
Sets up display character data write mode.
Notes
Notes
Notes
When this command is input, the LC74785/M
locks in the display character data write mode
until the CS1 pin goes high.
No. 5520-11/24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LC74785.PDF ] | |
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