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PDF LC74794 Data sheet ( Hoja de datos )
| Número de pieza | LC74794 | |
| Descripción | On-Screen Display Controller LSI | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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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, 74794M
Continued from preceding page.
Parameter
Symbol
Conditions
Color burst high level
Background color low level
Background color high level
Frame level 0
Frame level 1
Character level
VCBH
CVOUT; VDD1 = 5.0 V
VDD2 = 5.0 V
VRSL
CVOUT; VDD1 = 5.0 V
VDD2 = 5.0 V
VRSH
CVOUT; VDD1 = 5.0 V
VDD2 = 5.0 V
VBK0
CVOUT; VDD1 = 5.0 V
VDD2 = 5.0 V
VBK1
CVOUT; VDD1 = 5.0 V
VDD2 = 5.0 V
VCHA
CVOUT; VDD1 = 5.0 V
VDD2 = 5.0 V
Notes: When the sync level is 0.8 V.
When the sync level is 1.0 V.
When the sync level is 1.3 V.
The values in parentheses for the background color high and low levels are the values for a blue background.
min
Ratings
typ
1.67
1.87
2.17
1.23 (1.16)
1.43 (1.36)
1.73 (1.66)
2.37 (2.01)
2.57 (2.21)
2.87 (2.51)
1.50
1.70
2.00
2.08
2.28
2.58
2.65
2.85
3.15
max
Unit
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
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
SCLK1
CS1 (The period when CS1 is high)
CS1
SIN1
CS1
SIN1
The time to write 8 bits of data
The RAM data write time
PDC/VPS reads (For the n-channel open-drain output circuit. See Figure 2.)
Parameter
Symbol
Conditions
tCKCY SCLK2
Minimum input pulse width
tCKL SCLK2
tCKH SCLK2
Setup time
tICK SCLK2
Output delay time
tCKO DOUT
Note: Timings follow those for OSD write when the CMOS output circuit is used.
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
No. 5557-5/30
5 Page 
LC74794, 74794M
COMMAND3 (Horizontal display start position and horizontal size setup command)
First byte
DA
0 to 7
7
6
5
4
3
2
1
0
Register
—
—
—
—
HS21
HS20
HS11
HS10
State
1
0
1
1
0
1
0
1
0
1
0
1
Contents
Function
Command 3 identification code
Sets the horizontal display start position and the horizontal character size.
HS21 HS20
0
1
HS11 HS10
0
1
0
1Tc/dot
3Tc/dot
0
1Tc/dot
3Tc/dot
1
2Tc/dot
1Tc/dot
1
2Tc/dot
1Tc/dot
Notes
Second line horizontal character size
First line horizontal character size
Second byte
DA
0 to 7
7
6
5
4
3
2
1
0
Register
—
—
HP5
(MSB)
HP4
HP3
HP2
HP1
HP0
(LSB)
State
0
0
0
1
0
1
0
1
0
1
0
1
0
1
Contents
Function
Second byte identification bit
If HS is the horizontal start position then:
5
HS
=
Tc
×
(2
n
Σ
=
2n
0
HPn)
Tc: Period of the oscillator connected to OSCIN/OSCOUT in operating
mode.
Note: All registers are set to 0 when the LC74794/M is reset by the RST pin.
Notes
The horizontal display start position is set by
the 6 bits HP0 to HP5.
The weight of bit 1 is 2Tc.
No. 5557-11/30
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LC74794.PDF ] | |
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