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M708
PCM REMOTE CONTROL TRANSMITTER
It::'))' GSea'ijzMC()yNSOR]
75 mgmnemgitgemtewies
PCM REMOTE CONTROL TRANSMITTER
n 30 CHANNELS/4 ADDRESSES
u SELECTABLE FLASH/CARRIER TRANS-
MISSION MODE
n END OF TRANSMISSION CODE
a VERY LOW POWER DISSIPATION DURING
TRANSMISSION : DUTY CYCLE 0.15 % (flash
mode), 0.7 % (carrier mode)
a SINGLE CONTACT MATRIX KEYBOARD
n INTEGRATED ANTIBOUNCE AND INTER-
n WIDE SUPPLY RANGE (M708 4.5 to 10.5
V)/(M708A 3 to 10.5 V)
n WIDE REFERENCE FREQUENCY RANGE
(445 to 510 kHz ceramic resonator)
n 20 PIN PLASTIC PACKAGE
I: TO BE USED IN CONJUNCTION WITH
M490/M491 SINGLE CHIP STATION MEMORY
AND R.C. RECEIVER (flash mode) OR WITH
MICROPROCESSOR CONTROLLED SYSTEM
(carrier mode)
DESCRIPTION
This IC has been developed for remote control in
consumer applications. It uses a highly reliable
transmission code which has the capacity of 1024
channels. Each transmitted word is structured into
4 bits which constitute the address and 6 bits which
constitute the command. However only 2 addresses
and 30 commands are available in this IC. An addi-
tional command (000000) is used to transmit the
"end of transmission code" when the key is re-
leased.
Additional bits are transmitted for synchronization of
transmitter and receiver clocks and for security
checks. The address organization provides simulta-
neous applications without interference among
each system.
The receiver accepts the decoded command only if
the transmitted address matches the address se-
lected at the receiver. Four addresses are available
for this purpose. The reference oscillator is control-
led by a cheap ceramic resonator.
January 1989
ADVANCED DATA
When the M708 works in conjunction with
M490/M491 single chip Station Memory and R.C.
receiver the oscillator frequency can be in the range
445 to 510 kHz and no synchronization is required
with the receiver clock.
The M708 is produced with CMOS Si-gate technol-
ogy and is available in a 20 pin dual in-line plastic
package.
ORDER CODES .' M708 B1
M708A BI
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
M708-M708A
PIN CONNECTIONS
T M 1 20 , V00
OSC. IN 2 19 3 our lf ld
DD ss OSCJN OSCOUT TEST
oscouv 3 16] vss
H a 17 l x X
t ADDRESS
G I s 16 l z Z- our
TRANSMISSION
E (s 1s)rEsrr MODE tMN 0 Po
C 7 14 O 1 2 3 4/ 5/ 6/
F 1 7 ..
A f 8 13 ] P 13 18
19, 24,
I [ 9 12 l o 25
s 5566
M [ 10 11 l N
s- 5565
Note : The test pin must be connected to l/ss.
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
VDD Supply Voltage - 0.3 to 12 V
V. Input Voltage - 0.3 to VDD + 0.3 V
( lo I IR Output Current (t < 50 us) 10 mA
Top Operating Temperature 0 to 70 °C
Ptot Total Package Power Dissipation 200 mW
Tstg Storage Temperature - 55 to 125 °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 specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value Unit
VDD Supply Voltage : M708 4.5 to 10.5 V
M708A 3 to 10.5 V
VI Input Voltage 0 to VDD
L lo I IR Output Current (t < 50 us) max. 2.5 mA
fret Reference Frequency 445 to 510 kHz
Top Operating Temperature 0 to 70 "C
rs Serial Resistance of a Closed Key Contact max. 2.5 KQ
rp Parallel Resistance of Open Key Contact min. 2.2 MQ
Rs Serial Resistance of the Ceramic Resonator max. 20 n
grg' SGSoT'HOMStm
liSNWtNg,llhmK02itM%
