Description
The M494 is a monolithic LSI integrated circuit fabricatedin SGS-THOMSON’s EPM2 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 replacementfor all the conventional potentiometers and band switches particularly in low cost TV sets. It also provides some functions normally only associated with higher cost sets. NV memory is integrated on the chip together withall the necessarycontrolcircuitry 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). A local 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 device is packaged in a 40 pin DIL plastic