STV5342
TELETEXT DECODER WITH 4 INTEGRATED PAGES
April 1994
.
COMPLETE TELETEXT DECODER INCLUD-
ING ON-CHIP 4 PAGES MEMORY, REDUC-
ING EMC RADIATIONS
.
UPWARD
SOFTWARE AND HARDWARE
COMPATIBLE WITH PREVIOUS SGS-THOM-
SON's DECODER SDA5243
.
AUTOMATIC SELECTION OF UP TO SIX NA-
TIONAL LANGUAGES
.
4 SIMULTANEOUS PAGE REQUESTS
.
DISPLAY OF THE 25TH STATUS ROW
.
MICROPROCESSOR CONTROL VIA AN I
2
C
BUS (SLAVE ADDRESS 0010001 R/W)
.
DATA
ACQUISITION
AVAILABLE
FROM
LINES 2 TO 22 OR FROM A COMPLETE
FIELD
.
HIGH QUALITY DISPLAY USING A CHARAC-
TER MATRIX OF 12 x 10 DOTS
.
SINGLE + 5V SUPPLY VOLTAGE
.
ON-CHIP
MASK PROGRAMMABLE ROM
CHARACTER GENERATORS
.
HCMOS PROCESS
1
2
3
4
5
6
7
8
9
10
11
12
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
13
14
15
16
17
18
19
20
24
23
22
21
TTD
TTC
ODD/EVEN
F6
SAN D
TCS/SCS
R
G
B
COR
BL AN
Y
SCL
SDA
V
D D
V
SS
VCS
RESERVED
RESERVED
5342-01.EPS
PIN CONNECTIONS
DESCRIPTION
The STV5342 is a HCMOS integrated circuit which
performs all the processing of logical data within a
625 lines system teletext decoder. It is designed to
operate in conjunction with one-chip : the SAA5231
integrated chip which extracts Teletext information
embedded in a composite video signal. Up to 4
pages of display data can be stored in internal
memory. A complete system also comprises a mi-
croprocessor controlling the STV5342 via a 2-wires
serial bus. An on-chip ROM memory contains the
character sets. The STV5342 performs automatic
selection of one of up to six natural languages. Data
bytes may be decoded in either 7-Bit plus parity or
in full 8-Bit formats. The chip set also supports
facilities for reception and display of higher-level
protocol data.
DIP40
(Plastic Package)
ORDER CODE : STV5342
1/20
PIN DESCRIPTION
Pin
Symbol
Function
Description
1
V
DD
+5V
Positive supply voltage
2 to 5
22 to 40
RESERVED
Not used
6
TTD
Teletext data input
An A.C. coupled teletext data input supplied by the
SAA5231 chip is latched to V
SS
between 4 and 8
s
after each TV line.
7
TTC
Teletext clock input
A 6.9375MHz clock signal, supplied by the SAA5231
chip, is internally A.C. coupled, clamped and
buffered.
8
ODD/EVEN
Interlaced mode state output
High for even numbered and low for odd numbered
frames. The value is valid 2
s before the end of
lines 311 and 624.
9
F6
Character display clock signal
The 6MHz clock signal, supplied by the SAA5231
chip is internally A.C. coupled, clamped and buffered.
10
VCS
Video composite
synchronization input signal
Active high VCS input.
11
SAND
Sandcastle
Three level output pulse to the SAA5231 device.
Phase lock, blanking signal, and color burst
components are contained in this signal.
12
TCS/SCS
Input / output composite
synchronization signal
Scan composite input signal (SCS) for the display
synchronization or Text composite sync. (TCS)
output signal to the SAA5231. Both signals are
active low.
13,14,15
R G B
Red, green, blue
Character and background colors active-high
open-drain outputs.
16
COR
Contrast reduction
Open-drain active-low output supporting optimal
display of characters in "mixed mode" operation.
17
BLAN
Blanking signal output
Open-drain active high output for TV-image blanking
in normal and mixed-mode operation.
18
Y
Foreground output
Open-drain active-high output with foreground
information. Can be used for printer command.
19
SCL
Serial clock
Microprocessor clock input via serial bus.
20
SDA
Serial data input / output
Open-drain microprocessor serial data input/output
via serial bus.
21
V
SS
0 Volt
Ground
5342-01.TBL
STV5342
2/20
DATA
ADDRESS
CTRL
ADDRESS
CTRL
DATA
DATA
CLOC K
RED
GREEN
BLUE
SCL
SDA
TTC
TTD
F6
VCS
SAND
TCS/
SCS
V
D D
V
SS
Y
BLAN
COR ODD/
EVEN
Pins 22 to 40 and
Pins 2 to 5 not used
4 PAGES
INTERNAL
MEMORY
EXTERNAL
MEMORY
INTERFACE
TIME BASE
DATA ACQUISITION
&
DATA PROCESSING
DISPLAY &
CONTROL
INTERFACE
I C BUS
INTERFACE
2
9
7
6
19
20
1
21
18
17
16
8
15
14
13
10
11
12
5342-02.EPS
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
DD
Power Supply Range
-0.3, +6.0
V
INPUT VOLTAGE RANGE :
V
I
VCS,SDA,SCL,D0-D7
-0.3, V
DD
+ 0.5
V
V
I
TTD,F 6,TCS/SCS,TT C
-0.3, +10
V
OUTPUT VOLTAGE RANGE :
V
O
SAND,SDA,ODD/EVEN,R,G,B
-0.3 , V
DD
V
V
O
BLAN,COR, Y, TCS/SCS
-0.3 , V
DD
V
T
stg
Storage Temperature Range
-20, +125
o
C
T
A
Operating Ambient Temperature Range
-20, +70
o
C
5342-02.TBL
ELECTRICAL CHARACTERISTICS
V
DD
= 5V, V
SS
= 0V, T
A
= - 20 to + 70
o
C
Symbol
Parameter
Min
Typ
Max
Unit
V
DD
Supply Voltage (Pin 1)
4.5
5
5.5
V
I
DD
Supply Current (operating mode)
15
40
mA
5342-03.TBL
STV5342
3/20
ELECTRICAL CHARACTERISTICS (continued)
V
DD
= 5V, V
SS
= 0V, T
A
= - 20 to + 70
o
C
Symbol
Parameter
Min
Typ
Max
Unit
INPUTS
TTD (Pin 6)
C
EXT
Ext. Coupling Capacitor
50
nF
V
I(p-p)
Input Voltage p-p
2
7
V
t
r
, t
f
Input Rise / Fall Times
10
80
ns
t
DS
Input Set-up Time
40
ns
t
DH
Input Hold Time
40
ns
I
I(L)
Input Leakage Current (V
I
= 0 to V
DD
)
-10
+10
A
C
I
Input capacitance
7
pF
TTC, F6 (Pins 7,9)
V
I
DC Input Voltage
- 0.3
+10
V
V
I(p-p)
AC Input Voltage F6
AC Input Voltage TTC
1
1.5
7
7
V
V
V
P
Input Peak Rel. 50 % Duty
0.2
3.5
V
f
TTC
TTC Clock Frequency
6.9375
MHz
f
F6
F6 Clock Frequency
6
MHz
t
r
, t
f
Clock Rise / Fall Times
10
80
ns
I
I(L)
Input Leakage Current (V
I
= 0 to 10V)
-10
+10
A
C
I
Input Capacitance
10
pF
VCS (Pin 10)
V
IL
Low Level Input Voltage
0
0.8
V
V
IH
High Level Input Voltage
2
V
DD
V
t
r
, t
f
Input Rise / Fall Times
500
ns
I
I(L)
Input Leakage Current (V
I
= 0 to V
DD
)
-10
+10
A
C
I
Input Capacitance
7
pF
SCL (Pin 19)
V
IL
Low Level Input Voltage
0
1.5
V
V
IH
High Level Input Voltage
3
V
DD
V
f
SCL
SCL Clock Frequency
100
kHz
t
r
, t
f
Input Rise / Fall Times
2
s
I
I(L)
Input Leakage Current (V
I
= 0 to V
DD
)
-10
+10
A
C
I
Input Capacitance
7
pF
INPUT/OUTPUTS
TCS(output), SCS(input) (Pin12)
V
IL
Low Level Input Voltage
0
1.5
V
V
IH
High Level Input Voltage
3
8
V
t
r
, t
f
Input Rise / Fall Times
500
ns
I
I(L)
Input Leakage Current
(V
I
= 0 to V
DD
and output in high impedance state)
-10
+10
A
C
I
Input Capacitance
7
pF
V
OL
Low Level Output Voltage (I
OL
= 0.4mA)
0
0.4
V
V
OH
High Level Output Voltage (-I
OH
= 0.2mA)
2.4
V
DD
V
t
r
, t
f
Output Rise / Fall Times between 0.6V and 2.2V
100
ns
C
L
Load Capacitance
50
pF
5342-04.TBL
STV5342
4/20
ELECTRICAL CHARACTERISTICS (continued)
V
DD
= 5V, V
SS
= 0V, T
A
= - 20 to + 70
o
C
Symbol
Parameter
Min
Typ
Max
Unit
INPUT/OUTPUTS (continued)
SDA (Pin 20)
V
IL
Low Level Input Voltage
0
1.5
V
V
IH
High Level Input Voltage
3
V
DD
V
t
r ,
t
f
Input Rise / Fall Times
2
s
I
I(L)
Input Leakage Current (V
I
= 0 to V
DD
and output in high impedance state)
-10
+10
A
C
I
Input Capacitance
7
pF
V
OL
Low Level Output Voltage (I
OL
= 3mA)
0
0.5
V
t
f
Output Fall Time between 3.0V and 1.0V
200
ns
C
L
Load Capacitance
400
pF
D0-D7 (Pins 22-29)
V
IL
Low Level Input Voltage
0
0.8
V
V
IH
High Level Input Voltage
2
V
DD
V
I
I(L)
Input Leakage Current (V
I
= 0 to V
DD
and output in high impedance state)
-10
+10
A
C
I
Input Capacitance
7
pF
V
OL
Low Level Output Voltage (I
OL
= 1.6mA)
0
0.4
V
V
OH
High Level Output Voltage (-I
OH
= 0.2mA)
2.4
V
DD
V
t
r ,
t
f
Output Rise / Fall Times between 0.6V and 2.2V
50
ns
C
L
Load Capacitance
120
pF
OUTPUTS
ODD/EVEN
(Pin 8)
V
OL
Low Level Output Voltage (I
OL
= 0.4mA)
0
0.4
V
V
OH
High Level Output Voltage (-I
OH
= 0.2mA)
2.4
V
DD
V
t
r
, t
f
Output Rise / Fall Times between 0.6V and 2.2V
100
ns
C
L
Load Capacitance
50
pF
SAND (Pin 11)
V
OL
Low Level Output Voltage (I
OL
= 0.2mA)
0
-
0.25
V
V
OI
Middle Level Output Voltage (I
OL
=
10
A)
1.1
-
2.9
V
V
OH
High Level Output Voltage (-I
OH
= 0 to 10
A)
4
V
DD
V
t
r1
t
r2
Output Rise Time :
l
V
OL
to V
OI
from 0.4 to 1.1V
l
V
OI
to V
OH
from 2.9 to 4.0V
-
-
-
-
400
200
ns
t
f
Output Fall Time V
OH
to V
Ol
from 4.0 to 0.4V
-
-
50
ns
C
L
Load Capacitance
-
-
30
pF
R, G, B, COR, BLAN, Y (Pins 13-18)
V
OL
Low Level Output Voltage :
l
I
OL
= 2mA
l
I
OL
= 5mA
0
0
-
-
0.4
1
V
V
PU
Pull-up Voltage (with R = 1k
to V
DD
)
-
-
V
DD
V
t
f
Output Fall Time from 4.5 to 1.5V (with R = 1k
to V
DD
)
-
-
20
ns
t
SK
Skew Delay on Falling Edges (at 3V with R = 1k
connected to V
DD
)
-
-
20
ns
C
L
Load Capacitance
-
-
25
pF
I
LO
Output Leakage Current (V
PU
= 0 to V
DD
output off)
-
-
20
A
5342-05.TBL
STV5342
5/20
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