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Issue 0
ML145026
ML145027
ML145028
Encoder and Decoder Pairs
Legacy Device: Motorola/Freescale MC145026, MC145027, MC145028
These devices are designed to be used as encoder/decoder pairs in remote
control applications.
The ML145026 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 ML145027 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 trans-
mission (VT) output goes high on the ML145027 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 ML145028 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 ML145028 when two addresses are consecu-
tively received (in one encoding sequence) which both match the local
address.
• Operating Temperature Range: TA = – 40 to + 85°C
• Very–Low Standby Current for the Encoder: 300 nA Maximum @ 25°C
• Interfaces with RF, Ultrasonic, or Infrared Modulators and Demodulators
• RC Oscillator, No Crystal Required
• High External Component Tolerance; Can Use ± 5% Components
• Internal Power–On Reset Forces All Decoder Outputs Low
• Operating Voltage Range: ML145026 = 2.5 to 18 V*
ML145027, ML145028 = 4.5 to 18 V
• For Infrared Applications, See Application Note AN1016/D
PIN ASSIGNMENTS
ML145026
ENCODER
ML145028
DECODERS
ML145027
DECODERS
13
14
15
16
9
10
11
12
5
4
3
2
1
8
7
6
CTC
RTC
TE
Dout
VDD
A8/D8
A9/D9
RS
A4
A3
A2
A1
VSS
A7/D7
A6/D6
A5
13
14
15
16
9
10
11
12
5
4
3
2
1
8
7
6
D9
D8
D7
D6
VDD
Din
R2/C2
VT
A4
A3
A2
A1
VSS
C1
R1
A5
13
14
15
16
9
10
11
12
5
4
3
2
1
8
7
6
A9
A8
A7
A6
VDD
Din
R2/C2
VT
A4
A3
A2
A1
VSS
C1
R1
A5
P DIP 16 = EP
PLASTIC DIP
CASE 648
SO 16 = -5P
SOG PACKAGE
CASE 751B
SO 16W = -
5P
SOG PACKAGE
CASE 751G
16
1
16
1
16
1
CROSS REFERENCE/ORDERING INFORMATION
MOTOROLA
P DIP 16
MC145026P
ML145026EP
SO 16
MC145026D
ML145026-5P
P DIP 16
MC145027P
ML145027EP
SO 16
MC145027DW
ML145027-5P
P DIP 16
MC145028P
ML145028EP
SO 16
MC145028DW
ML145028-
5P
LANSDALE
PACKAGE
Note: Lansdale lead free (Pb) product, as it
becomes available, will be identified by a part
number prefix change from ML to MLE.
CMOS


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