saa5250 NXP Semiconductors, saa5250 Datasheet - Page 2

• Manufacturer Part Number: saa5250
• Description: Interface For Data Acquisition And Control For Multi-standard Teletext Systems
• Manufacturer: NXP Semiconductors

Philips Semiconductors
GENERAL DESCRIPTION
The SAA5250 is a CMOS Interface for Data Acquisition and Control (CIDAC) designed for use in conjunction with the
Video Input Processor (SAA5230) in a multi-standard teletext decoder. The device retrieves data from a user selected
channel (channel demultiplexer), as well as providing control signals and consecutive addressing space necessary to
drive a 2 K bytes buffer memory.
The system operates in accordance with the following transmission standards:
Features
PACKAGE OUTLINES
SAA5250P: 40-lead DIL; plastic (SOT129); SOT129-1; 1996 December 02.
SAA5250T: 40-lead mini-pack; plastic (VSO40); SOT158-1; 1996 December 02.
January 1987
French Didon Antiope specification D2 A4-2 (DIDON)
North American Broadcast Teletext specification (NABTS)
U.K. teletext (CEEFAX)
7,5 MHz maximum conversion rate
Three prefixes; DIDON, NABTS and U.K. teletext (CEEFAX)
Mode without prefix
Internal calculation of the validation (VAL) and colour burst blanking (CBB) signals, if programmed
Programmable framing code and channel numbers
Error parity calculation or not (odd parity)
Hamming processing of the prefix byte
Full channel or VBI reception
Slow/fast mode (detection of page flags or not)
Maximum/default format up to 63 bytes
Addressing space of 2 K bytes of the static memory
Multiplexed address/data information is compatible with Motorola or Intel microcontrollers
CIDAC is ‘MOTEL’ compatible
Interface for data acquisition and control
(for multi-standard teletext systems)
2
Product specification
SAA5250