Preliminary
KS2508
OSD PROCESSOR FOR MONITOR
OVERVIEW
The KS2508 is used to display some characters or symbols on
a screen of monitor. Basically, the operation is to control the
internal memory on chip and generate the R,G,B signals for
some characters or symbols. The R,G,B signals are synchro-
nized with the horizontal sync. Then the R,G,B signals are
mixed with the main video signal in the Video Amp IC.
The font data for characters or symbols are stored in the inter-
nal ROM. This stored data are accessed and controlled by the
control data from a micro controller. The control data are trans-
mitted through the I
2
C bus. All timing control signals including
the system clock are synchronized with the horizontal sync.
Therefore there is a PLL circuitry on chip.
16-DIP-300
FEATURES
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256 ROM fonts (Each font consists of 12 x 18 dots.)
Full Screen Memory Architecture
Wide range PLL available (15 kHz ~ 120 kHz)
Programmable vertical height of character
Programmable vertical and horizontal positioning
Character color selection up to 16 different colors
Programmable background color (Up to 16 colors)
Character blinking, bordering and shadowing
Color blinking
Character scrolling
Fade-in and fade-out
Box drawing
Character sizing up to four times
96 MHz pixel frequency from on-chip PLL
IIC Protocol Data Transmission (Slave Address : BAH)
ORDERING INFORMATION
Device
Package
Operating Temperature
0
°C
~ 70
°C
KS2508 16-DIP-300
1
Preliminary
KS2508
OSD PROCESSOR FOR MONITOR
PIN DESCRIPTIONS
Table 1. Pin Descriptions
Pin No.
1
2
3
Signal
VSS_A
VCO_IN
VREF1
Active
-
-
-
I/O
-
Input
Input
Ground (Analog Part)
This voltage is generated at the external loop filter and
goes into the input stage of the VCO.
1.26 V DC Voltage from the Bandgap Reference.
Connected to ground through a resistor to make internal
reference current (Typical 36 KΩ for 27µA)
+5 V Supply Voltage for Analog Part
Bandgap Reference Voltage (Typical 1.26 V)
Horizontal Flyback Signal
Serial Data (I
2
C)
Serial Clock (I
2
C)
Vertical Flyback Signal
Ground for Digital Part
Fast Blank Signal
Video Signal Output (B)
Video Signal Output (G)
Video Signal Output (R)
Intensity Signal Output
+5 V SUpply Voltage for Dogital Part
Description
4
5
6
7
8
9
10
11
12
13
14
15
16
VDD_A
VREF
HFLB
SDA
SCL
VFLB
VSS_D
FBLK
B_OUT
G_OUT
R_OUT
INT
VDD_D
-
-
Low
-
-
Low
-
-
-
-
-
-
-
-
Input
Input
In/Out
In/Out
Input
-
Output
Output
Output
Output
Output
-
4
Preliminary
KS2508
OSD PROCESSOR FOR MONITOR
ABSOLUTE MAXIMUM RATINGS
Parameters
Symbol
Min.
Maximum Supply Voltage
Input Voltage
Operating Temperature Range
Storage Temperature Range
Power Dissipation
NOTE: PKG Thermal Resistance : 64.2
°C/W
VDD
V
I
T
OPR
T
STG
P
D
-
-
-20
-40
-
-
Value
Typ.
-
-
-
Max.
7.0
7.0
70
125
1200
V
V
°C
°C
Unit
mW
ELECTRICAL CHARACTERISTICS
DC Electrical Characteristics
(Ta = 25
°C,
VDD = 5 V)
Table 2. DC Electrical Characteristics
Parameters (Conditions)
Supply Voltage
Supply Current
(No load on any output)
Input Voltage
Output Voltage
(lout = 1mA)
Input Leakage Current
VCO Input Voltage
Symbol
VDD
I
DD
V
IH
V
IL
V
OH
V
OL
I
IL
V
VCO
Min.
4.75
-
0.8VDD
-
0.8VDD
-
-10
Typ.
5.00
-
-
-
-
-
-
2.5
Max.
5.25
25
-
VSS + 0.4
-
VSS + 0.4
10
Unit
V
mA
V
V
V
V
µA
V
5
Talking
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