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M494 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. M494
Description  SINGLE-CHIP VOLTAGE TUNING SYSTEM WITH 4 ANALOG CONTROLS AND mP INTERFACE
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M494 Datasheet(HTML) 1 Page - STMicroelectronics

 
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M494
SINGLE-CHIP VOLTAGE TUNING SYSTEM WITH
4 ANALOG CONTROLS AND
µP INTERFACE
June 1991
DIP40
(Plastic Package)
ORDER CODE : M494B1
.
NON-VOLATILE MEMORY FOR 20 PRO-
GRAM WORDS (17 BIT x 20)
- TUNING VOLTAGE 12 BITS
- BAND 2 BITS
- MULTI STANDARD 2 BITS
- PROGRAM SKIP BIT 1 BIT
- 10,000 MODIFY CYCLES PER WORD
- MIN. 10 YEARS DATA RETENTION
.
13 BIT VOLTAGE SYNTHESIZER (BRM + PWM)
.
NV MEMORY FOR 4 ANALOG CONTROLS
(6 BIT x 4)
.
4 BAND SWITCH OUTPUTS
(VHF I & III, UHF, CATV)
.
5 x 7 KEYBOARD
.
2 AUDIO VISUAL OUTPUTS (VCR & PC)
.
2 CODED MULTI STANDARD OUTPUTS
(e.g. PAL, SECAM, NTSC etc.)
.
DIRECT 11/2 DIGIT 7 SEGMENT COMMON
ANODE LED DISPLAY DRIVING
.
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 TO 510kHz CHEAP CERAMIC RESONATOR
.
VDD =5V
± 5%. VPP = 25V ± 1V
DESCRIPTION
The M494 is a monolithic LSI integrated circuit
fabricated in SGS-THOMSON’s EPM2 process ; an
N-channel, Planox, double poly MOS process ca-
pable 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 conven-
tional potentiometers and band switches particu-
larly 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
with all the necessary control circuitry to provide the
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 op-
tions and skip associated functions. This device is
another significant step towards the complete inte-
gration of TV control circuitry.
The device is packaged in a 40 pin DIL plastic
package.
1/22


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