MC145027DWR2 [FREESCALE]
Encoder and Decoder Pairs; ??????? ???编码器和译码器对型号: | MC145027DWR2 |
厂家: | Freescale |
描述: | Encoder and Decoder Pairs |
文件: | 总20页 (文件大小:157K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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by MC145026/D
SEMICONDUCTOR TECHNICAL DATA
CMOS
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.
P SUFFIX
PLASTIC DIP
CASE 648
16
1
D SUFFIX
SOG PACKAGE
CASE 751B
16
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.
1
DW SUFFIX
SOG PACKAGE
CASE 751G
16
•
•
•
•
•
•
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
1
ORDERING INFORMATION
MC145026P
MC145026D
Plastic DIP
SOG Package
•
Operating Voltage Range: MC145026 = 2.5 to 18 V*
MC145027, MC145028 = 4.5 to 18 V
MC145027P, SC41343P
MC145027DW, SC41343DW
Plastic DIP
SOG Package
•
Low–Voltage Versions Available:
MC145028P, SC41344P
Plastic DIP
MC145028DW, SC41344DW
SOG Package
SC41343 = 2.8 to 10 V Version of the MC145027
SC41344 = 2.8 to 10 V Version of the MC145028
For Infrared Applications, See Application Note AN1016/D
•
PIN ASSIGNMENTS
MC145026
ENCODER
MC145027/SC41343
DECODERS
MC145028/SC41344
DECODERS
A1
A2
1
2
16
15
V
A1
A2
1
2
16
15
V
A1
A2
1
2
16
15
V
DD
DD
DD
D
D6
A6
out
A3
A4
3
4
14
13
TE
A3
A4
3
4
14
13
D7
D8
A3
A4
3
4
14
13
A7
A8
R
TC
A5
5
6
12
11
C
A5
5
6
12
11
D9
VT
A5
5
6
12
11
A9
VT
TC
S
A6/D6
R
R
R
C
1
1
1
A7/D7
7
8
10
9
A9/D9
A8/D8
C
7
8
10
9
R /C
2
7
8
10
9
R /C
2
2
1
2
V
V
V
SS
D
in
D
in
SS
SS
* All MC145026 devices manufactured after date code 9314 or 314 are guaranteed over this wider voltage range. All previous designs using the
low–voltage SC41342 should convert to the MC145026, which is a drop–in replacement. The SC41342 part number has been discontinued.
REV 2
1/98
Motorola, Inc. 1998
R
R
TC
S
C
TC
11
14
12
3–PIN
OSCILLATOR
AND
13
TE
DATA SELECT
AND
BUFFER
÷
4
15
D
out
DIVIDER
ENABLE
RING COUNTER AND 1–OF–9 DECODER
9
8
7
6
5
4
3
2
1
1
2
A1
A2
A3
A4
A5
3
4
5
TRINARY
DETECTOR
6
A6/D6
A7/D7
A8/D8
A9/D9
7
9
V
V
= PIN 16
= PIN 8
DD
SS
10
Figure 1. MC145026 Encoder Block Diagram
11
15
VT
D6
D7
CONTROL
LOGIC
14
13
D8
D9
12
SEQUENCER CIRCUIT
5
4
3
2
1
1
2
3
4
5
A1
A2
A3
A4
A5
DATA
EXTRACTOR
9
D
in
C
C
1
2
V
V
= PIN 16
= PIN 8
DD
SS
7
6
10
R
1
R
2
Figure 2. MC145027 Decoder Block Diagram
MC145026•MC145027•MC145028•SC41343•SC41344
MOTOROLA
2
11
CONTROL
LOGIC
VT
SEQUENCER CIRCUIT
9
8
7
6
5
4
3
2
1
1
2
A1
A2
A3
A4
A5
A6
A7
A8
A9
9–BIT
SHIFT
REGISTER
3
4
DATA
EXTRACTOR
5
9
D
in
15
14
13
12
C
C
1
2
7
6
V
= PIN 16
= PIN 8
10
DD
V
R
1
SS
R
2
Figure 3. MC145028 Decoder Block Diagram
MAXIMUM RATINGS* (Voltages Referenced to V
)
SS
This device contains protection circuitry to
guard against damage due to high static
voltages or electric fields. However, precau-
tionsmustbetakentoavoidapplicationsofany
voltage higher than maximum rated voltages
to this high–impedance circuit. For proper
Rating
Symbol
Value
Unit
V
DD
DC Supply Voltage (except SC41343,
SC41344)
– 0.5 to + 18
V
V
DD
DC Supply Voltage (SC41343, SC41344
only)
– 0.5 to + 10
V
operation, V and V
should be constrained
in out
to the range V
≤ (V or V ) ≤ V
.
DD
V
in
DC Input Voltage
– 0.5 to V
+ 0.5
V
V
SS in out
DD
V
out
DC Output Voltage
– 0.5 to V
+ 0.5
DD
I
DC Input Current, per Pin
DC Output Current, per Pin
Power Dissipation, per Package
Storage Temperature
± 10
mA
mA
mW
°C
in
I
± 10
out
P
500
D
T
stg
– 65 to + 150
260
T
Lead Temperature, 1 mm from Case for
10 Seconds
°C
L
* MaximumRatingsarethosevaluesbeyondwhichdamagetothedevicemayoccur. Func-
tional operation should be restricted to the limits in the Electrical Characteristics tables or
Pin Descriptions section.
MOTOROLA
MC145026•MC145027•MC145028•SC41343•SC41344
3
ELECTRICAL CHARACTERISTICS — MC145026*, MC145027, and MC145028 (Voltage Referenced to V
)
SS
Guaranteed Limit
– 40°C
25°C
85°C
V
DD
V
Symbol
Characteristic
Low–Level Output Voltage
Unit
Min
Max
Min
Max
Min
Max
V
OL
(V = V
in
or 0)
DD
5.0
10
15
—
—
—
0.05
0.05
0.05
—
—
—
0.05
0.05
0.05
—
—
—
0.05
0.05
0.05
V
V
High–Level Output Voltage
Low–Level Input Voltage
(V = 0 or V
in
)
DD
5.0
10
15
4.95
9.95
14.95
—
—
—
4.95
9.95
14.95
—
—
—
4.95
9.95
14.95
—
—
—
V
V
OH
V
IL
(V
(V
= 4.5 or 0.5 V)
= 9.0 or 1.0 V)
= 13.5 or 1.5 V)
5.0
10
15
—
—
—
1.5
3.0
4.0
—
—
—
1.5
3.0
4.0
—
—
—
1.5
3.0
4.0
out
out
(V
out
V
High–Level Input Voltage
High–Level Output Current
V
IH
(V
= 0.5 or 4.5 V)
= 1.0 or 9.0 V)
= 1.5 or 13.5 V)
5.0
10
15
3.5
7.0
11
—
—
—
3.5
7.0
11
—
—
—
3.5
7.0
11
—
—
—
out
(V
out
(V
out
I
mA
OH
(V
out
out
= 2.5 V)
= 4.6 V)
= 9.5 V)
5.0
5.0
10
– 2.5
– 0.52
– 1.3
– 3.6
—
—
—
—
– 2.1
– 0.44
– 1.1
– 3.0
—
—
—
—
– 1.7
– 0.36
– 0.9
– 2.4
—
—
—
—
(V
(V
(V
out
out
= 13.5 V)
15
I
Low–Level Output Current
mA
OL
(V
out
out
(V
out
= 0.4 V)
= 0.5 V)
= 1.5 V)
5.0
10
15
0.52
1.3
3.6
—
—
—
0.44
1.1
3.0
—
—
—
0.36
0.9
2.4
—
—
—
(V
I
in
Input Current — TE
(MC145026, Pull–Up Device)
5.0
10
15
—
—
—
—
—
—
3.0
16
35
11
60
120
—
—
—
—
—
—
µA
I
I
Input Current
15
—
± 0.3
—
± 0.3
—
± 1.0
µA
µA
in
R
(MC145026), D (MC145027, MC145028)
in
S
Input Current
in
A1 – A5, A6/D6 – A9/D9 (MC145026),
A1 – A5 (MC145027),
A1 – A9 (MC145028)
5.0
10
15
—
—
—
—
—
—
—
—
—
± 110
± 500
± 1000
—
—
—
—
—
—
C
Input Capacitance (V = 0)
in
—
—
—
—
7.5
—
—
pF
in
I
Quiescent Current — MC145026
5.0
10
15
—
—
—
—
—
—
—
—
—
0.1
0.2
0.3
—
—
—
—
—
—
µA
DD
I
Quiescent Current — MC145027, MC145028
Dynamic Supply Current — MC145026
5.0
10
15
—
—
—
—
—
—
—
—
—
50
100
150
—
—
—
—
—
—
µA
µA
µA
DD
I
5.0
10
15
—
—
—
—
—
—
—
—
—
200
400
600
—
—
—
—
—
—
dd
(f = 20 kHz)
c
I
Dynamic Supply Current — MC145027, MC145028
(f = 20 kHz)
c
5.0
10
15
—
—
—
—
—
—
—
—
—
400
800
1200
—
—
—
—
—
—
dd
* Also see next Electrical Characteristics table for 2.5 V specifications.
MC145026•MC145027•MC145028•SC41343•SC41344
MOTOROLA
4
ELECTRICAL CHARACTERISTICS — MC145026 (Voltage Referenced to V
)
SS
Guaranteed Limit
– 40°C
Min
25°C
85°C
V
DD
V
Symbol
Characteristic
Low–Level Output Voltage (V = 0 V or V
Unit
V
Max
0.05
—
Min
—
Max
0.05
—
Min
—
Max
0.05
—
V
OL
)
)
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
—
2.45
—
in
(V = 0 V or V
DD
DD
V
OH
High–Level Output Voltage
Low–Level Input Voltage
High–Level Input Voltage
High–Level Output Current
Low–Level Output Current
2.45
—
2.45
—
V
in
V
(V
out
= 0.5 V or 2.0 V)
= 0.5 V or 2.0 V)
0.3
—
0.3
—
0.3
—
V
IL
IH
V
(V
out
2.2
0.28
0.22
—
2.2
0.25
0.2
0.09
—
2.2
0.2
0.16
—
V
I
(V
out
= 1.25 V)
= 0.4 V)
—
—
—
mA
mA
µA
µA
µA
µA
OH
I
(V
out
—
—
—
OL
I
Input Current (TE — Pull–Up Device)
Input Current (A1–A5, A6/D6–A9/D9)
Quiescent Current
—
1.8
± 25
0.05
40
—
in
in
I
—
—
—
—
I
—
—
—
—
—
DD
I
dd
Dynamic Supply Current (f = 20 kHz)
—
—
—
—
—
c
ELECTRICAL CHARACTERISTICS — SC41343 and SC41344 (Voltage Referenced to V
)
SS
Guaranteed Limit
– 40°C
25°C
85°C
V
DD
V
Symbol
Characteristic
Low–Level Output Voltage (V = 0 V or V
Unit
Min
Max
Min
Max
Min
Max
V
OL
)
)
2.8
5.0
10
—
—
—
0.05
0.05
0.05
—
—
—
0.05
0.05
0.05
—
—
—
0.05
0.05
0.05
V
in
DD
DD
V
OH
High–Level Output Voltage
Low–Level Input Voltage
(V = 0 V or V
in
2.8
5.0
10
2.75
4.95
9.95
—
—
—
2.75
4.95
9.95
—
—
—
2.75
4.95
9.95
—
—
—
V
V
V
IL
(V
out
out
(V
out
= 2.3 V or 0.5 V)
= 4.5 V or 0.5 V)
= 9.0 V or 1.0 V)
2.8
5.0
10
—
—
—
0.84
1.5
3.0
—
—
—
0.84
1.5
3.0
—
—
—
0.84
1.5
3.0
(V
V
High–Level Input Voltage
High–Level Output Current
Low–Level Output Current
V
IH
(V
out
out
(V
out
= 0.5 V or 2.3 V)
= 0.5 V or 4.5 V)
= 1.0 V or 9.0 V)
2.8
5.0
10
1.96
3.5
7.0
—
—
—
1.96
3.5
7.0
—
—
—
1.96
3.5
7.0
—
—
—
(V
I
mA
mA
OH
(V
out
out
(V
out
= 1.4 V)
= 4.5 V)
= 9.0 V)
2.8
5.0
10
– 0.73
– 0.59
– 1.3
—
—
—
– 0.7
– 0.5
– 1.1
—
—
—
– 0.55
– 0.41
– 0.9
—
—
—
(V
I
OL
(V
out
out
(V
out
= 0.4 V)
= 0.5 V)
= 1.0 V)
2.8
5.0
10
0.35
0.8
3.5
—
—
—
0.3
0.6
2.9
—
—
—
0.24
0.4
2.3
—
—
—
(V
I
I
Input Current — D
Input Current
10
—
± 0.3
—
± 0.3
—
± 1.0
µA
µA
in
in
2.8
5.0
10
—
—
—
—
—
—
—
—
—
± 30
± 140
± 600
—
—
—
—
—
—
in
A1 – A5 (SC41343)
A1 – A9 (SC41344)
C
Input Capacitance (V = 0)
in
—
—
—
—
7.5
—
—
pF
in
I
Quiescent Current
2.8
5.0
10
—
—
—
—
—
—
—
—
—
60
75
150
—
—
—
—
—
—
µA
DD
I
dd
Dynamic Supply Current (f = 20 kHz)
2.8
5.0
10
—
—
—
—
—
—
—
—
—
300
500
1000
—
—
—
—
—
—
µA
c
MOTOROLA
MC145026•MC145027•MC145028•SC41343•SC41344
5
SWITCHING CHARACTERISTICS — MC145026*, MC145027, and MC145028 (C = 50 pF, T = 25°C)
L
A
Guaranteed Limit
Figure
No.
Symbol
, t
Characteristic
Output Transition Time
V
DD
Unit
Min
Max
t
4,8
5.0
10
15
—
—
—
200
100
80
ns
TLH THL
t
D
D
Rise Time — Decoders
5
5.0
10
15
—
—
—
15
15
15
µs
µs
r
in
in
t
Fall Time — Decoders
5
5.0
10
15
—
—
—
15
5.0
4.0
f
f
Encoder Clock Frequency
6
5.0
10
15
0.001
0.001
0.001
2.0
5.0
10
MHz
kHz
ns
osc
f
Decoder Frequency — Referenced to Encoder Clock
TE Pulse Width — Encoders
12
7
5.0
10
15
1.0
1.0
1.0
240
410
450
t
w
5.0
10
15
65
30
20
—
—
—
* Also see next Switching Characteristics table for 2.5 V specifications.
SWITCHING CHARACTERISTICS — MC145026 (C = 50 pF, T = 25°C)
L
A
Guaranteed Limit
Figure
No.
Symbol
, t
Characteristic
Output Transition Time
V
Unit
ns
Min
—
Max
450
250
—
DD
t
4, 8
6
2.5
TLH THL
f
Encoder Clock Frequency
TE Pulse Width
2.5
2.5
1.0
1.5
kHz
µs
osc
t
w
7
SWITCHING CHARACTERISTICS — SC41343 and SC41344 (C = 50 pF, T = 25°C)
L
A
Guaranteed Limit
Figure
No.
Symbol
, t
Characteristic
Output Transition Time
V
DD
Unit
Min
Max
t
4, 8
2.8
5.0
10
—
—
—
320
200
100
ns
TLH THL
t
D
D
Rise Time
Fall Time
5
2.8
5.0
10
—
—
—
15
15
15
µs
µs
r
in
in
t
5
2.8
5.0
10
—
—
—
15
15
5.0
f
f
Decoder Frequency — Referenced to Encoder Clock
12
2.8
5.0
10
1.0
1.0
1.0
100
240
410
kHz
MC145026•MC145027•MC145028•SC41343•SC41344
MOTOROLA
6
90%
10%
t
t
r
f
ANY OUTPUT
V
V
DD
90%
D
in
t
t
TLH
THL
10%
SS
Figure 4.
Figure 5.
1 / f
osc
V
V
DD
TE
50%
50%
R
TC
SS
t
w
Figure 6.
Figure 7.
TEST POINT
OUTPUT
DEVICE
UNDER
TEST
C *
L
* Includes all probe and fixture capacitance.
Figure 8. Test Circuit
MOTOROLA
MC145026•MC145027•MC145028•SC41343•SC41344
7
data output is available. The VT output is used to indicate that
a valid address has been received. For transmission security,
two identical transmitted words must be consecutively re-
ceived before a VT output signal is issued.
The MC145028 allows 19,683 addresses when trinary lev-
els are used. 512 addresses are possible when binary levels
are used.
OPERATING CHARACTERISTICS
MC145026
The encoder serially transmits trinary data as defined by
the state of the A1 – A5 and A6/D6 – A9/D9 input pins. These
pins may be in either of three states (low, high, or open) allow-
ing 19,683 possible codes. The transmit sequence is initiated
by a low level on the TE input pin. Upon power–up, the
MC145026 can continuously transmit as long as TE remains
low (also, the device can transmit two–word sequences by
pulsing TE low). However, no MC145026 application should
be designed to rely upon the first data word transmitted im-
mediately after power–up because this word may be invalid.
Between the two data words, no signal is sent for three data
periods (see Figure 10).
Each transmitted trinary digit is encoded into pulses (see
Figure 11). A logic 0 (low) is encoded as two consecutive
short pulses, a logic 1 (high) as two consecutive long pulses,
and an open (high impedance) as a long pulse followed by a
short pulse. The input state is determined by using a weak
“output” device to try to force each input high then low. If only
a high state results from the two tests, the input is assumed to
PIN DESCRIPTIONS
MC145026 ENCODER
A1 – A5, A6/D6 – A9/D9
Address, Address/Data Inputs (Pins 1 – 7, 9, and 10)
These address/data inputs are encoded and the data is
sent serially from the encoder via the D
pin.
out
R , C , R
S
TC TC
(Pins 11, 12, and 13)
These pins are part of the oscillator section of the encoder
(see Figure 9).
If an external signal source is used instead of the internal
oscillator, it should be connected to the R input and the R
S
TC
and C
pins should be left open.
TC
be hardwired to V . If only a low state is obtained, the input
is assumed to be hardwired to V . If both a high and a low
SS
DD
TE
Transmit Enable (Pin 14)
can be forced at an input, an open is assumed and is encoded
as such. The “high” and “low” levels are 70% and 30% of the
supply voltage as shown in the Electrical Characteristics
table. The weak “output” device sinks/sources up to 110 µA at
a 5 V supply level, 500 µA at 10 V, and 1 mA at 15 V.
This active–low transmit enable input initiates transmission
when forced low. An internal pull–up device keeps this input
normally high. The pull–up current is specified in the Electri-
cal Characteristics table.
D
The TE input has an internal pull–up device so that a simple
switch may be used to force the input low. While TE is high
and the second–word transmission has timed out, the encod-
er is completely disabled, the oscillator is inhibited, and the
current drain is reduced to quiescent current. When TE is
brought low, the oscillator is started and the transmit se-
quence begins. The inputs are then sequentially selected,
and determinations are made as to the input logic states. This
out
Data Out (Pin 15)
This is the output of the encoder that serially presents the
encoded data word.
V
SS
Negative Power Supply (Pin 8)
The most–negative supply potential. This pin is usually
ground.
information is serially transmitted via the D
pin.
out
V
DD
MC145027
Positive Power Supply (Pin 16)
This decoder receives the serial data from the encoder and
outputs the data, if it is valid. The transmitted data, consisting
of two identical words, is examined bit by bit during reception.
The first five trinary digits are assumed to be the address. If
the received address matches the local address, the next four
(data) bits are internally stored, but are not transferred to the
output data latch. As the second encoded word is received,
the address must again match. If a match occurs, the new
data bits are checked against the previously stored data bits.
If the two nibbles of data (four bits each) match, the data is
transferred to the output data latch by VT and remains until
new data replaces it. At the same time, the VT output pin is
brought high and remains high until an error is received or un-
til no input signal is received for four data periods (see Figure
10).
The most–positive power supply pin.
MC145027 AND MC145028 DECODERS
A1 – A5, A1 – A9
Address Inputs (Pins 1 – 5) — MC145027,
Address Inputs (Pins 1 – 5, 15, 14, 13, 12) — MC145028
These are the local address inputs. The states of these
pins must match the appropriate encoder inputs for the VT pin
to go high. The local address may be encoded with trinary or
binary data.
D6 – D9
Data Outputs (Pins 15, 14, 13, 12) — MC145027 Only
These outputs present the binary information that is on
encoder inputs A6/D6 through A9/D9. Only binary data is
acknowledged; a trinary open at the MC145026 encoder is
decoded as a high level (logic 1).
Although the address information may be encoded in tri-
nary, the data information must be either a 1 or 0. A trinary
(open) data line is decoded as a logic 1.
D
in
Data In (Pin 9)
MC145028
This pin is the serial data input to the decoder. The input
voltage must be at CMOS logic levels. The signal source driv-
ing this pin must be dc coupled.
This decoder operates in the same manner as the
MC145027 except that nine address lines are used and no
MC145026•MC145027•MC145028•SC41343•SC41344
MOTOROLA
8
R , C
VT
1
1
Resistor 1, Capacitor 1 (Pins 6, 7)
Valid Transmission Output (Pin 11)
As shown in Figures 2 and 3, 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
This valid transmission output goes high after the second
word of an encoding sequence when the following conditions
are satisfied:
R x C should be set to 1.72 encoder clock periods:
1
1
1. thereceivedaddressesofbothwordsmatchthelocalde-
coder address, and
2. the received data bits of both words match.
R C = 3.95 R
C
1
1
TC TC
R /C
2
2
VT remains high until either a mismatch is received or no
input signal is received for four data periods.
Resistor 2/Capacitor 2 (Pin 10)
As shown in Figures 2 and 3, this pin accepts a resistor and
capacitor that are used to detect both the end of a received
V
SS
word and the end of a transmission. The time constant R x
Negative Power Supply (Pin 8)
2
C should be 33.5 encoder clock periods (four data periods
2
The most–negative supply potential. This pin is usually
ground.
per Figure 11): R C = 77 R
C
. This time constant is
2
2
TC TC
used to determine whether the D pin has remained low for
in
four data periods (end of transmission). A separate on–chip
comparator looks at the voltage–equivalent two data periods
V
DD
Positive Power Supply (Pin 16)
(0.4 R C ) to detect the dead time between received words
2
2
within a transmission.
The most–positive power supply pin.
MOTOROLA
MC145026•MC145027•MC145028•SC41343•SC41344
9
R
S
C
TC
R
TC
11
12
13
INTERNAL
ENABLE
This oscillator operates at a frequency determined by the
external RC network; i.e.,
1
f ≈
(Hz)
ThevalueforR shouldbechosentobe≥ 2timesR .Thisrangeensures
S TC
2.3 R ′
C
TC TC
thatcurrentthroughR isinsignificantcomparedtocurrentthroughR . The
S
TC
upperlimitforR mustensurethatR x5pF(inputcapacitance)issmallcom-
S
S
for 1 kHz ≤ f ≤ 400 kHz
where: C ′ = C + C + 12 pF
pared to R
TC
x C
.
TC
TC
TC
layout
For frequencies outside the indicated range, the formula is less accurate.
Theminimumrecommendedoscillationfrequencyofthiscircuitis1kHz. Sus-
ceptibilitytoexternallyinducednoisesignalsmayoccurforfrequenciesbelow
1 kHz and/or when resistors utilized are greater than 1 MΩ.
R
R
R
≈ 2 R
S
S
TC
≥ 20 k
≥ 10 k
TC
400 pF < C
< 15 µF
TC
Figure 9. Encoder Oscillator Information
ENCODER
PW
min
2 WORD TRANSMISSION
TE
CONTINUOUS TRANSMISSION
ENCODER
OSCILLATOR
(PIN 12)
1ST
DIGIT
9TH
DIGIT
1ST
DIGIT
9TH
DIGIT
D
out
(PIN 15)
OPEN
LOW
HIGH
1ST WORD
2ND WORD
ENCODING SEQUENCE
1.1 (R C )
2
2
DECODER
VT
(PIN 11)
DATA OUTPUTS
Figure 10. Timing Diagram
MC145026•MC145027•MC145028•SC41343•SC41344
MOTOROLA
10
ENCODER
OSCILLATOR
(PIN 12)
ENCODED
“ONE”
D
ENCODED
“ZERO”
out
(PIN 15)
ENCODED
“OPEN”
DATA PERIOD
Figure 11. Encoder Data Waveforms
500
400
300
V
= 15 V
DD
V
= 10 V
DD
200
100
V
= 5 V
DD
10
20
30
40
50
C
(pF) ON PINS 1 – 5 (MC145027); PINS 1 – 5 AND 12 – 15 (MC145028)
layout
Figure 12. f
max
vs C — Decoders Only
layout
MOTOROLA
MC145026•MC145027•MC145028•SC41343•SC41344
11
HAS
NO
THE TRANSMISSION
BEGUN?
YES
DOES
THE 5–BIT
ADDRESS MATCH
THE ADDRESS
PINS?
DISABLE VT
ON THE 1ST
ADDRESS MISMATCH
NO
YES
STORE
THE
4–BIT
DATA
DOES
THIS DATA
MATCH THE PREVIOUSLY
STORED
DISABLE VT
ON THE 1ST
DATA MISMATCH
NO
DATA?
YES
IS THIS
AT LEAST THE
2ND CONSECUTIVE
MATCH SINCE VT
DISABLE?
NO
YES
LATCH DATA
ONTO OUTPUT
PINS AND
ACTIVATE VT
HAVE
4–BIT TIMES
PASSED?
YES
DISABLE
VT
NO
HAS
A NEW
NO
TRANSMISSION
BEGUN?
YES
Figure 13. MC145027 Flowchart
MC145026•MC145027•MC145028•SC41343•SC41344
MOTOROLA
12
HAS
NO
THE TRANSMISSION
BEGUN?
YES
DOES
THE ADDRESS
MATCH THE
ADDRESS
PINS?
DISABLE VT ON THE 1ST
ADDRESS MISMATCH
AND IGNORE THE REST
OF THIS WORD
NO
YES
IS
THIS AT LEAST
THE 2ND CONSECUTIVE
MATCH SINCE VT
DISABLE?
NO
YES
ACTIVATE VT
HAVE
4–BIT TIMES
PASSED?
YES
DISABLE VT
NO
HAS A
NEW TRANSMISSION
BEGUN?
NO
YES
Figure 14. MC145028 Flowchart
MOTOROLA
MC145026•MC145027•MC145028•SC41343•SC41344
13
V
MC145027 AND MC145028 TIMING
DD
D
in
To verify the MC145027 or MC145028 timing, check the
waveforms on C1 (Pin 7) and R2/C2 (Pin 10) as compared to
0 V
the incoming data waveform on D (Pin 9).
The R–C decay seen on C1 discharges down to 1/3 V
before being reset to V . This point of reset (labelled “DOS”
DD
in Figure 15) is the point in time where the decision is made
in
DD
V
DD
2/3
1/3
0 V
C1
whether the data seen on D is a 1 or 0. DOS should not be
in
too close to the D data edges or intermittent operation may
in
DOS
DOS
occur.
The other timing to be checked on the MC145027 and
MC145028 is on R2/C2 (see Figure 16). The R–C decay is
Figure 15. R–C Decay on Pin 7 (C1)
continually reset to V
as data is being transmitted. Only
between words and after the end–of–transmission (EOT)
DD
does R2/C2 decay significantly from V . R2/C2 can be used
to identify the internal end–of–word (EOW) timing edge which
DD
EOW
is generated when R2/C2 decays to 2/3 V . The internal
V
DD
DD
EOT timing edge occurs when R2/C2 decays to 1/3 V
.
DD
When the waveform is being observed, the R–C decay
should go down between the 2/3 and 1/3 V levels, but not
2/3
1/3
0 V
R2/C2
DD
too close to either level before data transmission on D re-
in
sumes.
EOT
Verification of the timing described above should ensure a
good match between the MC145026 transmitter and the
MC145027 and MC145028 receivers.
Figure 16. R–C Decay on Pin 10 (R2/C2)
MC145026•MC145027•MC145028•SC41343•SC41344
MOTOROLA
14
V
V
DD
DD
V
DD
TE
V
DD
0.1
µF
0.1 µF
A1
A1
14
16
16
A2
A3
A4
A5
D6
D7
D8
D9
5
A2
A3
15
D
D
9
1
2
3
out
in
1
2
TRINARY
ADDRESSES
5
6
TRINARY
ADDRESSES
3
4
A4
A5
4
R1
MC145027
OR
SC41343
7
5
6
5
15
14
MC145026
R
TC
13
12
C
1
D6
D7
D8
D9
7
9
C
TC
4–BIT
BINARY
DATA
13
12
11
10
11
10
R
S
VT
C
8
R2
2
8
C
′ = C
100 pF ≤ C
+ C
+ 12 pF
TC
TC
layout
≤ 15 µF
1
TC
≥ 10 kΩ; R ≈ 2 R
TC
REPEAT OF ABOVE
REPEAT OF ABOVE
f
=
osc
R
R
C
R
C
2.3 R ′
C
TC
S
TC TC
≥ 10 kΩ
1
1
2
2
≥ 400 pF
≥ 100 kΩ
≥ 700 pF
R C = 3.95 R
1 1
C
TC TC
C
TC TC
R C = 77 R
2 2
Example R/C Values (All Resistors and Capacitors are ± 5%)
(C ′ = C
TC
+ 20 pF)
TC
(kHz)
f
R
C
R
R
C
R
C
2
osc
TC
TC′
S
1
1
2
362
10 k
10 k
10 k
10 k
10 k
10 k
50 k
120 pF
240 pF
490 pF
1020 pF
2020 pF
5100 pF
5100 pF
20 k
20 k
20 k
20 k
20 k
20 k
100 k
10 k
10 k
10 k
10 k
10 k
10 k
50 k
470 pF
910 pF
100 k
100 k
100 k
100 k
100 k
200 k
200 k
910 pF
1800 pF
3900 pF
7500 pF
0.015 µF
0.02 µF
0.1 µF
181
88.7
42.6
21.5
8.53
1.71
2000 pF
3900 pF
8200 pF
0.02 µF
0.02 µF
Figure 17. Typical Application
MOTOROLA
MC145026•MC145027•MC145028•SC41343•SC41344
15
detected and filtered by a diode/RC network to extract the
data envelope from the burst. Comparator A5 boosts the sig-
nal to logic levels compatible with the MC145027/28 data
APPLICATIONS INFORMATION
INFRARED TRANSMITTER
input. The D pin of these decoders is a standard CMOS
in
In Figure 18, the MC145026 encoder is set to run at an os-
cillator frequency of about 4 to 9 kHz. Thus, the time required
for a complete two–word encoding sequence is about 20 to
40 ms. The data output from the encoder gates an RC oscilla-
tor running at 50 kHz; the oscillator shown starts rapidly
enough to be used in this application. When the “send” button
is not depressed, both the MC145026 and oscillator are in a
low–power standby state. The RC oscillator has to be
trimmed for 50 kHz and has some drawbacks for frequency
stability. A superior system uses a ceramic resonator oscilla-
tor running at 400 kHz. This oscillator feeds a divider as
shown in Figure 19. The unused inputs of the MC14011UB
must be grounded.
The MLED81 IRED is driven with the 50 kHz square wave
at about 200 to 300 mA to generate the carrier. If desired, two
IREDs wired in series can be used (see Application Note
AN1016 for more information). The bipolar IRED switch,
shown in Figure 18, offers two advantages over a FET. First,
a logic FET has too much gate capacitance for the
MC14011UB to drive without waveform distortion. Second,
the bipolar drive permits lower supply voltages, which are an
advantage in portable battery–powered applications.
The configuration shown in Figure 18 operates over a
supply range of 4.5 to 18 V. A low–voltage system which
operates down to 2.5 V could be realized if the oscillator sec-
tion of a MC74HC4060 is used in place of the MC14011UB.
The data output of the MC145026 is inverted and fed to the
RESET pin of the MC74HC4060. Alternately, the
MC74HCU04 could be used for the oscillator.
high–impedance input which must not be allowed to float.
Therefore, direct coupling from A5 to the decoder input is
utilized.
Shielding should be used on at least A1 and A2, with good
ground and high–sensitivity circuit layout techniques applied.
For operation with supplies higher than + 5 V, limiter A4’s
positive output swing needs to be limited to 3 to 5 V. This is
accomplished via adding a zener diode in the negative feed-
back path, thus avoiding excessive system noise. The bias-
ing resistor stack should be adjusted such that V3 is 1.25 to
1.5 V.
This system works up to a range of about 10 meters. The
gains of the system may be adjusted to suit the individual
design needs. The 100 Ω resistor in the emitter of the first
2N5088 and the 1 kΩ resistor feeding A2 may be altered if
different gain is required. In general, more gain does not nec-
essarily result in increased range. This is due to noise floor
limitations. The designer should increase transmitter power
and/or increase receiver aperature with Fresnal lensing to
greatly improve range. See Application Note AN1016 for
additional information.
Information on the MC34074 is in data book DL128/D.
TRINARY SWITCH MANUFACTURERS
Midland Ross–Electronic Connector Div.
Greyhill
Augat/Alcoswitch
Aries Electronics
Information on the MC14011UB is in book number
DL131/D. The MC74HCU04 and MC74HC4060 are found in
book number DL129/D.
The above companies may not have the switches in a DIP.
For more information, call them or consult eem Electronic En-
gineers Master Catalog or the Gold Book. Ask for SPDT with
center OFF.
INFRARED RECEIVER
The receiver in Figure 20 couples an IR–sensitive diode to
input preamp A1, followed by band–pass amplifier A2 with a
gain of about 10. Limiting stage A3 follows, with an output of
about 800 mV p–p. The limited 50 kHz burst is detected by
comparator A4 that passes only positive pulses, and peak–
Alternative: An SPST can be placed in series between a
SPDT and the Encoder or Decoder to achieve trinary action.
Motorola cannot recommend one supplier over another
and in no way suggests that this is a complete listing of trinary
switch manufacturers.
MC145026•MC145027•MC145028•SC41343•SC41344
MOTOROLA
16
V+
SELECT FOR
200 mA TO 300 mA
USE OF 2 MLED81s
IS OPTIONAL
MLED81
MC14011UB
10 kΩ
MPSA13
OR
SEND
MPSW13
MC14011UB
TE
D
out
MC145026
R
C
R
TC
S
TC
0.01 µF
220 kΩ
1000 pF
100 k
9
ADJUST/SELECT FOR
f = 50 kHz (APPROX. 100 kΩ)
SWITCHES
220 k
Ω
Ω
FOR APPROX. 4 kHz
47 kΩ FOR APPROX. 9 kHz
Figure 18. IRED Transmitter Using RC Oscillator to Generate Carrier Frequency
V+
MC14011UB
MC14024
50 kHZ TO
CLK
Q3
DRIVER
TRANSISTOR
RESET
1MΩ
X1 = 400 kHz CERAMIC RESONATOR
PANASONIC EFD–A400K04B
OR EQUIVALENT
V+
MC14011UB
X1
D
out
FROM MC145026
470 pF
470 pF
Figure 19. Using a Ceramic Resonator to Generate Carrier Frequency
MOTOROLA
MC145026•MC145027•MC145028•SC41343•SC41344
17
+ 5 V
10 k
Ω
A1
1 mH — TOKO TYPE 7PA OR 10PA
OR EQUIVALENT
10
µF
10 kΩ
10 µF
22 k
Ω
0.01
µF
2N5088
2N5086
2N5088
0.01 µF
1 kΩ
10 kΩ
–
A2
V1
+
100
Ω
6.8 kΩ
2.2 kΩ
OPTICAL
FILTER
1/4 MC34074
1
µF
1N914
1N914
4.7 kΩ
0.01 µF
1 M
Ω
100 k
–
Ω
1 M
Ω
10 kΩ
1N914
A3
+
1 kΩ
22 kΩ
V1
+
+
A4
–
V2
A5
1/4 MC34074
V3
–
1/4 MC34074
1000 pF
47 kΩ
1/4 MC34074
+ 5 V
390 k
180 k
Ω
Ω
FOR APPROX. 4 kHz
FOR APPROX. 9 kHz
1000 pF
750 k
360 k
Ω
Ω
FOR APPROX. 4 kHz
FOR APPROX. 9 kHz
0.01 µF
4.7 kΩ
V2
V1
≈
≈
2.7 V
2.5 V
R1
R2/C2
VT
C1
390
Ω
MC145027/28
D
V
in
2.2 k
Ω
Ω
DATA OUT
MC145027 ONLY
V
DD
SS
4
10 µF
V3
≈
1.3 V
10 µF
9 FOR MC145027
5 FOR MC145028
10 µF
+ 5 V
2.7 k
ADDRESS
SWITCHES
Figure 20. Infrared Receiver
MC145026•MC145027•MC145028•SC41343•SC41344
MOTOROLA
18
PACKAGE DIMENSIONS
P SUFFIX
PLASTIC DIP (DUAL IN–LINE PACKAGE)
CASE 648–08
NOTES:
–A–
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
16
1
9
8
B
S
INCHES
MILLIMETERS
DIM
A
B
C
D
F
MIN
MAX
0.770
0.270
0.175
0.021
0.70
MIN
18.80
6.35
3.69
0.39
1.02
MAX
19.55
6.85
4.44
0.53
1.77
F
0.740
0.250
0.145
0.015
0.040
C
L
SEATING
–T–
G
H
J
K
L
0.100 BSC
0.050 BSC
2.54 BSC
1.27 BSC
PLANE
K
M
0.008
0.015
0.130
0.305
10
0.21
0.38
3.30
7.74
10
H
J
0.110
0.295
0
2.80
7.50
0
G
D 16 PL
0.25 (0.010)
M
S
0.020
0.040
0.51
1.01
M
M
T
A
D SUFFIX
SOG (SMALL OUTLINE GULL–WING) PACKAGE
CASE 751B–05
–A–
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
16
9
8
–B–
P 8 PL
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
M
S
0.25 (0.010)
B
1
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
G
MILLIMETERS
INCHES
DIM
A
B
C
D
MIN
9.80
3.80
1.35
0.35
0.40
MAX
10.00
4.00
1.75
0.49
1.25
MIN
MAX
0.393
0.157
0.068
0.019
0.049
F
0.386
0.150
0.054
0.014
0.016
R X 45
K
C
F
G
J
K
M
P
R
1.27 BSC
0.050 BSC
–T–
SEATING
PLANE
0.19
0.10
0
0.25
0.25
7
0.008
0.004
0
0.009
0.009
7
J
M
D
16 PL
5.80
0.25
6.20
0.50
0.229
0.010
0.244
0.019
M
S
S
0.25 (0.010)
T
B
A
MOTOROLA
MC145026•MC145027•MC145028•SC41343•SC41344
19
DW SUFFIX
SOG (SMALL OUTLINE GULL–WING) PACKAGE
CASE 751G–02
–A–
16
9
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE MOLD
PROTRUSION.
–B–
8X P
M
M
0.010 (0.25)
B
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER
SIDE.
1
8
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN
EXCESS OF D DIMENSION AT MAXIMUM
MATERIAL CONDITION.
J
16X D
M
S
S
0.010 (0.25)
T
A
B
F
MILLIMETERS
INCHES
DIM
A
B
C
D
MIN
10.15
7.40
2.35
0.35
0.50
MAX
10.45
7.60
2.65
0.49
0.90
MIN
MAX
0.411
0.299
0.104
0.019
0.035
0.400
0.292
0.093
0.014
0.020
R X 45
C
F
G
J
K
M
P
R
1.27 BSC
0.050 BSC
–T–
0.25
0.10
0
0.32
0.25
7
0.010
0.004
0
0.012
0.009
7
M
SEATING
14X G
K
PLANE
10.05
0.25
10.55
0.75
0.395
0.010
0.415
0.029
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specificallydisclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
datasheetsand/orspecificationscananddovaryindifferentapplicationsandactualperformancemayvaryovertime. Alloperatingparameters,including“Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applicationsintended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
ordeathmayoccur. ShouldBuyerpurchaseoruseMotorolaproductsforanysuchunintendedorunauthorizedapplication,BuyershallindemnifyandholdMotorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and
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