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MC145026 Datasheet(PDF) 1 Page - Freescale Semiconductor, Inc

Part # MC145026
Description  Encoder and Decoder Pairs CMOS
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC145026 Datasheet(HTML) 1 Page - Freescale Semiconductor, Inc

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© Freescale Semiconductor, Inc., 2005. All rights reserved.
Freescale Semiconductor
Technical Data
Freescale reserves the right to change the detail specifications as may be required to permit improvements in the design of its
products.
MC145026/D
Rev. 4, 1/2005
MC145026, MC145027
MC145028
D Suffix
SOG Package
Case751B
P Suffix
Plastic DIP
Case 648
DW Suffix
SOG Package
Case 751G
16
1
16
1
16
1
Ordering Information
Device
Package
MC145026P
Plastic DIP
MC145026D
SOG Package
MC145027P
Plastic DIP
MC145027DW
SOG Package
MC145028P
Plastic DIP
MC145028DW
SOG Package
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.
MC145026, MC145027,
MC145028
Encoder and Decoder Pairs
CMOS
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


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