M293B1 ,EPM 32 ELECTRONIC PROGRAM MEMORY FOR 32 STATIONS
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M293B1
EPM 32 ELECTRONIC PROGRAM MEMORY FOR 32 STATIONS
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EPM 32 ELECTRONIC PROGRAM MEMORY
FOR 32 STATIONS
- ONE CHIP INCLUDING CONTROL AND NV
MEMORY
n SUPPLY VOLTAGEVDD =5 1/t5% VPP = 25 V:
1 V (only for storage and reading)
. AUTOMATIC, SEMIAUTOMATIC AND MA-
NUAL SEARCH MODES
. MANUAL SEARCH CONTROLLED BY ONLY
TWO KEYS (up and down). THE SEARCH
SPEED IS AUTOMATICALLY INCREASED
SMOOTHLY WITH THE TIME
I 4 BAND OUTPUTS WITH STEP-BY-STEP SE-
LECTION AND THE POSSIBILITY OF SKIP-
PING UNWANTED BANDS
- MEMORY ADDRESSING AND COPY CAPA-
BILITY
. EXTERNALLY ADJUSTABLE SEARCH SPEED
" 445 TO 510 kHz CLOCK OSCILLATOR
" VOLTAGE SYNTHESIZER, 8192 STEP RES-
OLUTION
I FINE TUNING IN 8 STEPS, STORABLE FOR
EACH PROGRAM SEPARATELY
- MINIMUM EXTERNAL COMPONENTS
. INTEGRATED DIGITAL POWER-ON RESET (1
second)
. TECHNICAL NOTE TN 153 AVAILABLE
DESCRIPTION
The M293 is a monolithic integrated circuit con-
structed in N-channel silicon gate technology, de-
signed to control a varicap tuner with a resolution of
8192 steps (13 bits) via a D/A converter, using the
principle of voltage synthesis.
The device also includes a 544 bit NV Memory for
storage of 32 stations. Each station is identified by
a 17 bit word containing the information for tuning
voltage (12 bits), band (2 bits) and fine tuning (3
bits). The circuit is able to operate in automatic,
Jan uary 1989
semiautomatic or manual modes. The search speed
is controlled externally by an RC network and is
adapted internally to the various bands and mode
of operation. In the automatic mode the M293 works
in conjunction with the TDA4433, which recognizes
TV stations and converts the AFC-S-curve into a
digital command. The stations are selected by ap-
plying a static bit binary word. A strobe input is also
provide. A 7 segment decoder-driver (e.g.
TDA4092) can be connected to the same lines for
Program number display.
A serial information output is provided so that using
the M191, the varicap voltage in the form of a linear
bar and the selected band can be displayed on the
screen.
The M293 is available in a 28 lead dual in-line plas-
tic package.
ORDER CODE : M29381
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
VDD Supply Voltage - 0.3 to 7 V
Vpp Memory Supply Voltage - 0.3 to 28 V
V. Input Voltage - 0.3 to 15 V
Vo (off) Off State Input Voltage (except pin 10) 15 V
Pin 10 28 V
loc Output Current (except pins 11 - 19) 5 mA
Pins 11 - 19 7.5 mA
IOH Output Current (pin 2) - 2 mA
Pun Total Package Power Dissipation 1 W
Tstg Storage Teperature - 25 to 125 “C
Top Operating Temperature 1 0 to 70 °C
Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only
and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specifi-
cation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
PIN CONNECTIONS
GND t l 28 CATV
31:19am 2 271 UHF
PA E 3 as) VHFm
PB t 1. vs) VHF]
PC t 5 2d l 2
pa t e 23] y
PE E 7 22] x
'itW17 t e 2: l STOPIAFCZ
SEARCH t 9 ao) STOP/AFC1
angoDRv H t NING our
TIMING t IO 19 _ U
F.T.0UT t 11 Is] CLOCK our
V00 12 17 l DATA OUT
osc.1 13 1e] HAWJBL'
osc.2 E11. 15] TEST
2/17 cc, scs-momsou
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