M145028D ,REMOTE CONTROL ENCODER/DECODER CIRCUITG(c,'L ' uc,
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M145028D ,REMOTE CONTROL ENCODER/DECODER CIRCUITBLOCK DIAGRAMS
Figure1 I EncoderM145026
3-PIN OSCILLATOR
AND ENABLE
RING COUNTERAND 1-of-9 ..
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M145026-M145026B1-M145026D-M145028B1-M145028D
REMOTE CONTROL ENCODER/DECODER CIRCUIT
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M145026
Ijlillla20)EllaE(MG'i0hlQCg) M14502 - M145028
REMOTE CONTROL ENCODER/DECODER CIRCUITS
. M145026 ENCODER
. M145027/M145028 DECODERS
- MAY BE ADDRESSED IN EITHER BINARY OR
TRINARY
- TRINARY ADDRESSING MAXIMIZES NUM-
BER OF CODES
- INTERFACES WITH RF, ULTRASONIC, ORIN-
FRARED TRANSMISSION MEDIAS
. DOUBLE TRANSMISSIONS FOR ERROR
CHECKING
'' 4.5VTO 18V OPERATION
I ON-CHIP R/C OSCILLATOR, NO CRYSTAL
REQUIRED
- HIGH EXTERNAL COMPONENT TOLER-
ANCE, CAN USE 5% COMPONENTS
- STANDARD CMOS B-SERIES INPUT AND
OUTPUT CHARACTERISTICS
- APPLICATIONS INCLUDE GARAGE DOOR
OPENERS, REMOTE CONTROLLED TOYS,
SECURITY MONITORING, ANTITHEFT SYS-
TEMS, LOW END DATA TRANSMISSIONS
WIRE LESS TELEPHONES
DESCRIPTION
The M145026 encodes nine bits of information and
serially transmitst_his information upon receipt of a
transmit enable, TE, (active low) signal. Nine inputs
may be encoded with tn'nary data (0,1 , open) to al-
low 39 (19.683) different codes.
Two decoders are presently available. Both use the
same transmitter - the M145026. The decoders will
receive the 9-bit word and will interpret some of the
bits as address codes and some as data. The
M14502 interprets the frst five transmitted bits as
address and the last fourbits as data. The M145028
treats all nine bits as address. If no errors are re-
ceived, the M145027outputsthefourdata bits when
the transmittersends address codes that match that
of the receiver. A valid transmission output goes
high on both decoders when they recognize an ad-
dress that matches that of the decoder. Other re-
ceivers can be produced with differentaddress/data
ratios.
All the devices are available in 16 lead plastic pack-
age. The M145026 is available in SO16 plastic
package (narrow) and the M145028 is available in
SO16 plastic package (large).
October 1993
DIP16 (0.25")
(Plastic package)
ORDER CODES l
hM45026B1
M145027B1
M145028 B1
SO16 Narrow (0.15")
(Plastic package)
ORDER CODE : M145026D
5016 Large (0.3'')
(Plastic package)
ORDER CODE l M145028D
M145026 " M14502 " M145028
PIN CONNECTIONS
Encoder Dacodar Decoder
A1ID1[:1 U 16:]vw A1|:1 V 16 va, A1E1 V 16:|vDo
A2102E2 15:]DATAOUT A2|:2 15:]06 A2[:2 15:]A6
m3[:3 143E ME: 14307 ”E3 14:]A7
MID4 4 " RTC M 4 13 D8 A4 4 13 A8
I: M1450“ Cl l: "1451327 Cl l: M14502: Cl
ASIDSES 123cm ASUS 12:]09 ASUS 12:}A9
A6/Ds[:6 1‘!sz R1[:s 11:]v1' R1[:6 113w
A7ID7 l: 7 IO Cl ASIDS Cl I: 7 1o Cl R2/C2 Cl . 7 10 CI RZICZ
vssEa 9:]Aa/os vssEs 9:]DATAIN vssEa 9:]DATAIN
BLOCK DIAGRAMS
Figure1 : EncoderM145026
RS RTC
" = 4 DATA SELECT
3-PIN OSCILLATOR . T
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A1/D1 1
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A2/02 [El
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A3ID3 [El
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A4ID4 El l>
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A7/D7 [El D Cl
ABIDB Lir-rr(i1i1
ASIDQ LD Cl
14502-01 EPS
1450102 EPS
