1996 Nov 07
2
Philips Semiconductors
Preliminary specification
Integrated VIP and teletext decoder
(IVT1.1X)
SAA5254
FEATURES
Complete teletext decoder including page memory and
FASTEXT links in a 40-pin DIP package
Automatic processing of extension packet 26 for widest
possible language decoding. All our standard language
options can be available, and language option is
readable via I
2
C-bus
100% hardware compatible with the SAA5244A; plug-in
replacement and extra market
100% hardware compatible with the SAA5244A, except
if the special OSD symbols were used with the
SAA5244A, except ROM identification number
The device is pin-aligned with the other members of the
new Philips teletext decoder family, i.e. SAA5280 and
the SAA5249, making one hardware solution for the full
range
Low software overhead for the control microprocessor
Single page acquisition system
RGB interface to standard colour decoder ICs, push-pull
output drive
Separate text and video signal quality detectors.
DESCRIPTION
The Integrated VIP and Teletext decoder (IVT1.1X) is
designed to decode 625-line based World System Teletext
transmissions. This single-chip teletext decoder hardware
is based on the SAA5244A with which it is completely
compatible.
Like the SAA5244A the device contains all the hardware
necessary to decode the teletext, but the SAA5254 also
contains extra hardware to process the extension packet
26 characters automatically, extending the markets to
which the TV chassis can be shipped and opening the
possibility of many more language options.
ORDERING INFORMATION
QUICK REFERENCE DATA
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
SAA5254P
DIP40
plastic dual in-line package; 40 leads (600 mil)
SOT129-1
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
V
DD
supply voltage
4.5
5.0
5.5
V
I
DD
supply current
-
90
120
mA
V
sync
sync voltage amplitude
0.1
0.3
0.6
V
V
video
video voltage amplitude
0.7
1.0
1.4
V
f
XTAL
crystal frequency
-
27
-
MHz
T
amb
operating ambient temperature
-
20
-
+70
C
1996 Nov 07
4
Philips Semiconductors
Preliminary specification
Integrated VIP and teletext decoder
(IVT1.1X)
SAA5254
PINNING
SYMBOL
PIN
DESCRIPTION
V
DD1
1
+5 V supply 1
OSCOUT
2
27 MHz crystal oscillator output
OSCIN
3
27 MHz crystal oscillator input
OSCGND
4
0 V crystal oscillator ground
V
SS1
5
0 V ground 1
REF+
6
Positive reference voltage for the ADC. This pin should be connected to +5 V.
BLACK
7
Video black level storage pin, connected to ground via a 100 nF capacitor.
CVBS
8
Composite video input pin. A positive-going 1 V (peak-to-peak) input is required,
connected via a 100 nF capacitor.
IREF
9
Reference current input pin, connected to ground via a 27 k
resistor.
V
DD2
10
+5 V supply 2
POL
11
STTV/LFB/FFB polarity selection pin
STTV/LFB
12
Sync to TV output pin/line flyback input pin. Function controlled by an internal register bit
(scan sync mode).
VCR/FFB
13
PLL time constant switch/field flyback input pin. Function controlled by an internal register
bit (scan sync mode).
V
SS2
14
0 V ground 2
R
15
Dot rate character output of the RED colour information.
G
16
Dot rate character output of the GREEN colour information.
B
17
Dot rate character output of the BLUE colour information.
RGBREF
18
DC input voltage to define the output high level on the RGB pins.
BLAN
19
Dot rate fast blanking output.
V
SS3
20
0 V ground 3
COR
21
Programmable active LOW output to provide contrast reduction of the TV picture for mixed
text and picture displays or when viewing newsflash/subtitle pages; open drain output.
ODD/EVEN
22
25 Hz output synchronized with the CVBS inputs field sync pulses to produce a
non-interlaced display by adjustment of the vertical deflection currents.
Y
23
Dot rate character output of teletext foreground colour information; open drain output.
SCL
24
Serial clock input for the I
2
C-bus. It can still be driven during power-down of the device.
SDA
25
Serial input/output data port for the I
2
C-bus; open drain output. It can still be driven during
power-down of the device.
i.c.
26 to 40
Internally connected. Must be left open-circuit in application.
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