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MC145026 Datasheet

  • MC145026

  • Encoder and Decoder Pairs

  • Motorola   Motorola

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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document
by MC145026/D
Encoder and Decoder Pairs
CMOS
These devices are designed to be used as encoder/decoder pairs in remote
control applications.
The MC145026 encodes nine lines of information and serially sends this
information upon receipt of a transmit enable (TE) signal. The nine lines may be
encoded with trinary data (low, high, or open) or binary data (low or high). The
words are transmitted twice per encoding sequence to increase security.
The MC145027 decoder receives the serial stream and interprets five of the
trinary digits as an address code. Thus, 243 addresses are possible. If binary
data is used at the encoder, 32 addresses are possible. The remaining serial
information is interpreted as four bits of binary data. The valid transmission (VT)
output goes high on the MC145027 when two conditions are met. First, two
addresses must be consecutively received (in one encoding sequence) which
both match the local address. Second, the 4 bits of data must match the last
valid data received. The active VT indicates that the information at the Data
output pins has been updated.
The MC145028 decoder treats all nine trinary digits as an address which
allows 19,683 codes. If binary data is encoded, 512 codes are possible. The VT
output goes high on the MC145028 when two addresses are consecutively
received (in one encoding sequence) which both match the local address.
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Operating Temperature Range: 鈥?40 to + 85擄C
Very鈥揕ow Standby Current for the Encoder: 300 nA Maximum @ 25擄C
Interfaces with RF, Ultrasonic, or Infrared Modulators and Demodulators
RC Oscillator, No Crystal Required
High External Component Tolerance; Can Use
鹵
5% Components
Internal Power鈥揙n Reset Forces All Decoder Outputs Low
MC145026
MC145027
MC145028
SC41343
SC41344
P SUFFIX
PLASTIC DIP
CASE 648
1
16
16
1
D SUFFIX
SOG PACKAGE
CASE 751B
16
DW SUFFIX
SOG PACKAGE
CASE 751G
1
ORDERING INFORMATION
MC145026P
MC145026D
MC145027P, SC41343P
MC145027DW, SC41343DW
MC145028P, SC41344P
MC145028DW, SC41344DW
Plastic DIP
SOG Package
Plastic DIP
SOG Package
Plastic DIP
SOG Package
鈥?/div>
Operating Voltage Range: MC145026 = 2.5 to 18 V
*
MC145027, MC145028 = 4.5 to 18 V
鈥?/div>
Low鈥揤oltage Versions Available:
SC41343 = 2.8 to 10 V Version of the MC145027
SC41344 = 2.8 to 10 V Version of the MC145028
鈥?/div>
For Infrared Applications, See Application Note AN1016/D
PIN ASSIGNMENTS
MC145026
ENCODER
A1
A2
A3
A4
A5
A6/D6
A7/D7
VSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDD
Dout
TE
RTC
CTC
RS
A9/D9
A8/D8
MC145027/SC41343
DECODERS
A1
A2
A3
A4
A5
R1
C1
VSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDD
D6
D7
D8
D9
VT
R2/C2
Din
MC145028/SC41344
DECODERS
A1
A2
A3
A4
A5
R1
C1
VSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDD
A6
A7
A8
A9
VT
R2/C2
Din
* All MC145026 devices manufactured after date code 9314 or 314 are guaranteed over this wider voltage range. All previous designs using the
low鈥搗oltage SC41342 should convert to the MC145026, which is a drop鈥搃n replacement. The SC41342 part number has been discontinued.
REV 2
1/98
漏
Motorola, Inc. 1998
MOTOROLA
MC145026鈥C145027鈥C145028鈥C41343鈥C41344
1

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