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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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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

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RS RTC
TE 11
14
CTC
12 13
3-PIN
OSCILLATOR
AND
ENABLE
÷4
DIVIDER
DATA SELECT
AND
BUFFER
15 DOUT
RING COUNTER AND 1-OF-9 DECODER
987654321
A1
A2
A3
A4
A5
A6/D6
A7/D7
A8/D8
A9/D9
1
2
3
4
5
6
7
9
10
TRINARY
DETECTOR
VDD = PIN 16
VSS = PIN 8
Figure 2. MC145026 Encoder Block Diagram
11
VT
CONTROL
LOGIC
SEQUENCER CIRCUIT
54321
A1 1
A2 2
A3 3
A4 4
A5 5
15 D6
14 D7
13 D8
12 D9
DATA
EXTRACTOR
C1 7
6
10
R1
C2
R2
9
Din
VDD = PIN 16
VSS = PIN 8
Freescale Semiconductor
Figure 3. MC145027 Decoder Block Diagram
MC145026, MC145027, MC145028 Technical Data, Rev. 4
Introduction
3

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Electrical Specifications
CONTROL
LOGIC
11 VT
SEQUENCER CIRCUIT
9 876543 21
A1 1
A2 2
A3 3
A4 4
5
A5
A6 15
A7 14
A8 13
A9 12
9-BIT
SHIFT
REGISTER
DATA
EXTRACTOR
C1 7
R1 6 C2
10
R2
9
Din
VDD = PIN 16
VSS = PIN 8
Figure 4. MC145028 Decoder Block Diagram
2 Electrical Specifications
Table 1. Maximum Ratings* (Voltages Referenced to VSS)
Ratings
Symbol
Value
Unit
DC Supply Voltage
VDD
- 0.5 to + 18
V
DC Input Voltage
Vin
- 0.5 to VDD + 0.5
V
DC Output Voltage
Vout
- 0.5 to VDD + 0.5
V
DC Input Current, per Pin
Iin ± 10 mA
DC Output Current, per Pin
Iout ± 10 mA
Power Dissipation, per Package
PD 500 mW
Storage Temperature
Tstg
- 65 to + 150
°C
Lead Temperature, 1 mm from Case for 10 Seconds
TL 260 °C
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be
restricted to the limits in the Electrical Characteristics tables or Pin Descriptions section.
This device contains protection circuitry to guard against damage due to high static voltages or electric
fields. However, precautions must be taken to avoid applications of any voltage higher than maximum
rated voltages to this high-impedance circuit. For proper operation, Vin and Vout should be constrained to
the range VSS (Vin or Vout) VDD.
MC145026, MC145027, MC145028 Technical Data, Rev. 4
4 Freescale Semiconductor

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Electrical Specifications
Table 2. Electrical Characteristics - MC1450261, MC145027, and MC145028
(Voltage Referenced to VSS)
Symbol
Characteristic
Guaranteed Limit
VDD
V
- 40°C
25°C
85°C
Unit
Min Max Min Max Min Max
VOL Low-Level Output Voltage
(Vin = VDD or 0)
5.0
10
15
-
-
-
VOH High-Level Output Voltage
(Vin = 0 or VDD) 5.0
10
4.95
9.95
15 14.95
VIL Low-Level Input Voltage
(Vout = 4.5 or 0.5 V) 5.0
(Vout = 9.0 or 1.0 V) 10
(Vout = 13.5 or 1.5 V) 15
-
-
-
VIH High-Level Input Voltage
(Vout = 0.5 or 4.5 V) 5.0
(Vout = 1.0 or 9.0 V) 10
(Vout = 1.5 or 13.5 V) 15
3.5
7.0
11
IOH High-Level Output Current
(Vout = 2.5 V)
(Vout = 4.6 V)
(Vout = 9.5 V)
(Vout = 13.5 V)
5.0
5.0
10
15
- 2.5
- 0.52
- 1.3
- 3.6
IOL Low-Level Output Current
(Vout = 0.4 V)
(Vout = 0.5 V)
(Vout = 1.5 V)
5.0
10
15
0.52
1.3
3.6
Iin Input Current - TE
(MC145026, Pull-Up Device)
5.0 -
10 -
15 -
Iin Input Current
15
RS (MC145026), Din (MC145027, MC145028)
Iin Input Current
A1 - A5, A6/D6 - A9/D9 (MC145026),
A1 - A5 (MC145027),
A1 - A9 (MC145028)
5.0
10
15
-
-
-
-
Cin Input Capacitance (Vin = 0)
IDD Quiescent Current - MC145026
--
5.0 -
10 -
15 -
IDD Quiescent Current - MC145027, MC145028
5.0
10
15
-
-
-
1 Also see next Electrical Characteristics table for 2.5 V specifications.
0.05
0.05
0.05
-
-
-
1.5
3.0
4.0
-
-
-
-
-
-
-
-
-
-
-
-
-
± 0.3
-
-
-
-
-
-
-
-
-
-
- 0.05 -
- 0.05 -
- 0.05 -
4.95 - 4.95
9.95 - 9.95
14.95 - 14.95
- 1.5 -
- 3.0 -
- 4.0 -
3.5 - 3.5
7.0 - 7.0
11 - 11
- 2.1 - - 1.7
- 0.44 - - 0.36
- 1.1 - - 0.9
- 3.0 - - 2.4
0.44 - 0.36
1.1 - 0.9
3.0 - 2.4
3.0 11
16 60
35 120
-
-
-
- ± 0.3 -
- ± 110 -
- ± 500 -
- ± 1000 -
- 7.5 -
- 0.1 -
- 0.2 -
- 0.3 -
- 50 -
- 100 -
- 150 -
0.05
0.05
0.05
-
-
-
1.5
3.0
4.0
-
-
-
-
-
-
-
-
-
-
-
-
-
± 1.0
-
-
-
-
-
-
-
-
-
-
V
V
V
V
mA
mA
µA
µA
µA
pF
µA
µA
Freescale Semiconductor
MC145026, MC145027, MC145028 Technical Data, Rev. 4
5