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SAA5261PS

10-page intelligent teletext decoders

Philips Electronics 

Philips Semiconductors

10-page intelligent teletext decoders

Product specification

SAA5261; SAA5262; SAA5263

PINNING

SYMBOL

V0

V1

V2

V3

V4

V5

V6

V7

res

res

res

res

VSSD1

SCLK1

SDAT1

SA

FP

HSMODE

VSMODE

PDI

PL

VSSA

CVBS1

CVBS2

BLACK

Iref

FRAME

VSSD2

COR

PON

RGBREF

B

PIN

DESCRIPTION

1 versatile open-drain input/output bit 0 (should be tied HIGH)

2 versatile open-drain input/output bit 1 (should be tied HIGH)

3 versatile open-drain input/output bit 2 (should be tied HIGH)

4 versatile open-drain input/output bit 3 (should be tied HIGH)

5 versatile open-drain input/output bit 4 (should be tied HIGH)

6 versatile open-drain input/output bit 5 (should be tied HIGH)

7 versatile open-drain input/output bit 6 (should be tied HIGH)

8 versatile open-drain input/output bit 7 (should be tied HIGH)

9 reserved

10 reserved

11 reserved

12 reserved

13 digital ground 1

14 serial clock input 1 (NVRAM)

15 serial data input/output 1 (NVRAM)

16 slave address input: LOW selects 58H; HIGH selects 60H

17 field polarity input: LOW selects first half line; HIGH selects second half line at the start of an

even field

18 horizontal sync mode control input: LOW selects HSYNC on rising edge

19 vertical sync mode control input. LOW selects VSYNC on rising edge

20 power-down imminent input: this input should be pulled LOW to indicate that the system is

about to lose power

21 phase-lock output: HIGH indicates that the system is phase-locked to the CVBS input

22 analog ground

23 CVBS input: this signal is applied via a 100 nF capacitor (nominal input 1 V (p-p)

24 this pin should be connected to ground if unused

25 black level input: a 100 nF capacitor should be connected to VSSA

26 reference current input for analog circuits: for correct operation a 27 kΩ resistor should be

connected to VSSA

27 Frame output for use in non-interlaced displays: during teletext off, teletext mixed with TV

picture and subtitles this pin is inactive. In full teletext mode this pin provides a 25 Hz square

wave. FRAME = 1 = odd, FRAME = 0 = even.

28 digital ground 2

29 contrast reduction: active LOW output which allows selective contrast reduction of the

television picture to enhance a mixed mode display

30 picture on output: HIGH indicates that a TV picture is present and that the SAA526xPS is in

TV mode, mix mode, subtitle mode or news flash mode

31 RGB reference input: drive level reference for RGB outputs

32 blue dot rate character output of the blue colour information: the high voltage level is defined

by the RGBREF pin (can source 4 mA)

1998 Apr 22

5

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