M494

·NON-VOLATILE MEMORY FOR 20 PROGRAM WORDS (17 BIT x 20)
   - TUNING VOLTAGE 12 BITS
   - BAND 2 BITS
   - MULTI STANDARD 2 BITS
   - PROGRAMSKIP BIT 1 BIT
   - 10,000 MODIFY CYCLES PER WORD
   - MIN. 10 YEARSDATARETENTION
·13 BITVOLTAGESYNTHESIZER(BRM +PWM)
· NV MEMORY FOR 4 ANALOG CONTROLS (6 BIT x 4)
·4 BANDSWITCH OUTPUTS (VHF I & III, UHF, CATV)
 ·5 x 7 KEYBOARD
·2 AUDIOVISUAL OUTPUTS (VCR & PC)
·2 CODED MULTI STANDARD OUTPUTS (e.g. PAL, SECAM, NTSC etc.)
·DIRECT 11/2 DIGIT 7 SEGMENT COMMON
   ANODE LED DISPLAYDRIVING
·PCM REMOTE CONTROL RECEIVER (M708 transmitter)
·5-BIT DATA INPUT + CONTROL LINE FOR P INTERFACE
·LINEAR AFC DEFEAT OUTPUT
·FLYBACK/SYNC .COINCIDENCE INPUT FOR
·SEMI-AUTOMATIC SEARCH
·STANDBY OUTPUT
·OPTION SELECT : 16 OR 20 PROGRAMS
·POWER UP MODE .
·PROGRAM SKIP DEFEAT
·AV OPTIONS
·1 * OR DECADE MODE OPTION IN 20 PRO.
   GRAM OPTION
·TEMPORARY ANALOG UP/DOWN INDICA.
   TOR ON LED DISPLAY
·BAND SKIP OPTION
·455 TO510kHzCHEAP CERAMIC RESONATOR
·V_DD = 5V ± 5%. V_PP = 25V ± 1V

The M494 is a monolithic LSI integrated circuit fabricated in SGS-THOMSON'sEPM2 process; an N-channel, Planox, double poly MOS process capable of including a floating gate NV memory cell (EEPROM).

The i.c. has been designed as a complete digital TV tuning system based on the voltage synthesis principle and as a replacement for all the conventional potentiometers and band switches particularly in low cost TV sets. The M494 also provides some functions normally only associated with higher cost sets. NVmemory is integrated on the chip together with all the necessarycontrol circuitry to providethe program memory. Separate NV memory is also integrated to provide the memory for four analog controls. A seven segment LED display can be directly driven by the chip to display the program selected, and the direction of movement of the analog controls. Provision is made for a remote control receiver both on and off chip, the latter is interfaced via a data input and single control line. (This enables control by a microprocessor). Alocal keyboard can be used with the device in a variety of configurations. An option select pin provides for different program number options, power up options and skip associated functions. This device is another significant step towards the complete integration of TV control circuitry.

The M494 is packaged in a 40 pin DIL plastic package.