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PDF MC145026 Data sheet ( Hoja de datos )
| Número de pieza | MC145026 | |
| Descripción | Encoder and Decoder Pairs CMOS | |
| Fabricantes | Freescale Semiconductor | |
| Logotipo |  |
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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.
1 page  
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
5 Page 
Pin Descriptions
R1, C1
Resistor 1, Capacitor 1 (Pins 6, 7)
As shown in Figure 3 and Figure 4, these pins accept a resistor and capacitor that are used to determine
whether a narrow pulse or wide pulse has been received. The time constant R1 × C1 should be set to
1.72 encoder clock periods:
R1 C1 = 3.95 RTC CTC
R2/C2
Resistor 2/Capacitor 2 (Pin 10)
As shown in Figure 3 and Figure 4, this pin accepts a resistor and capacitor that are used to detect both the
end of a received word and the end of a transmission. The time constant R2 x C2 should be 33.5 encoder
clock periods (four data periods per Figure 12): R2 C2 = 77 RTC CTC. This time constant is used to
determine whether the Din pin has remained low for four data periods (end of transmission). A separate
on-chip comparator looks at the voltage-equivalent two data periods (0.4 R2 C2) to detect the dead time
between received words within a transmission.
VT
Valid Transmission Output (Pin 11)
This valid transmission output goes high after the second word of an encoding sequence when the
following conditions are satisfied:
1. the received addresses of both words match the local decoder address, and
2. the received data bits of both words match.
VT remains high until either a mismatch is received or no input signal is received for four data periods.
VSS
Negative Power Supply (Pin 8)
The most-negative supply potential. This pin is usually ground.
VDD
Positive Power Supply (Pin 16)
The most-positive power supply pin.
Freescale Semiconductor
MC145026, MC145027, MC145028 Technical Data, Rev. 4
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MC145026.PDF ] | |
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