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Freescale Semiconductor Electronic Components Datasheet



MC145027

Encoder and Decoder Pairs CMOS



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MC145027 pdf
Freescale Semiconductor
Technical Data
MC145026/D
Rev. 4, 1/2005
MC145026, MC145027
MC145028
MC145026, MC145027,
MC145028
Encoder and Decoder Pairs
CMOS
1 Introduction
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.
16
1
P Suffix
Plastic DIP
Case 648
16
1
D Suffix
SOG Package
Case751B
16
1
DW Suffix
SOG Package
Case 751G
Ordering Information
Device
Package
MC145026P
Plastic DIP
MC145026D
SOG Package
MC145027P
Plastic DIP
MC145027DW
SOG Package
MC145028P
Plastic DIP
MC145028DW
SOG Package
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Electrical Specifications . . . . . . . . . . . . . . . . 4
3 Operating Characteristics . . . . . . . . . . . . . . . 8
4 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . 9
5 MC145027 and MC145028 Timing . . . . . . . . 16
6 Package Dimensions . . . . . . . . . . . . . . . . . . 18
Freescale reserves the right to change the detail specifications as may be required to permit improvements in the design of its
products.
© Freescale Semiconductor, Inc., 2005. All rights reserved.



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MC145027 pdf
Introduction
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.
• Operating Temperature Range: - 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:
MC145026 = 2.5 to 18 V
MC145027, MC145028 = 4.5 to 18 V
MC145026
ENCODER
A1
A2
A3
A4
A5
A6/D6
A7/D7
VSS
VDD
Dout
TE
RTC
CTC
RS
A9/D9
A8/D8
MC145027
DECODERS
A1 VDD
A2 D6
A3 D7
A4 D8
A5 D9
R1 VT
C1 R2/C2
VSS
Din
Figure 1. Pin Assignments
MC145028
DECODERS
A1 VDD
A2 A6
A3 A7
A4 A8
A5 A9
R1 VT
C1 R2/C2
VSS
Din
MC145026, MC145027, MC145028 Technical Data, Rev. 4
2 Freescale Semiconductor



Part Number MC145027
Description Encoder and Decoder Pairs CMOS
Maker Freescale Semiconductor - Freescale Semiconductor
Total Page 20 Pages
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