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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document by MC145026/D
Encoder and Decoder Pairs
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. 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 + 85C Very-Low Standby Current for the Encoder: 300 nA Maximum @ 25C 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
MC145026 MC145027 MC145028 SC41343 SC41344
P SUFFIX PLASTIC DIP CASE 648
1
16
16 1
D SUFFIX SOG PACKAGE CASE 751B
16
DW SUFFIX SOG PACKAGE CASE 751G
1
ORDERING INFORMATION
MC145026P MC145026D MC145027P, SC41343P MC145027DW, SC41343DW MC145028P, SC41344P MC145028DW, SC41344DW Plastic DIP SOG Package Plastic DIP SOG Package Plastic DIP SOG Package
* Operating Voltage Range: MC145026 = 2.5 to 18 V* MC145027, MC145028 = 4.5 to 18 V * Low-Voltage Versions Available: 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
A1 A2 A3 A4 A5 A6/D6 A7/D7 VSS 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VDD Dout TE RTC CTC RS A9/D9 A8/D8
MC145027/SC41343 DECODERS
A1 A2 A3 A4 A5 R1 C1 VSS 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VDD D6 D7 D8 D9 VT R2/C2 Din
MC145028/SC41344 DECODERS
A1 A2 A3 A4 A5 R1 C1 VSS 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VDD A6 A7 A8 A9 VT R2/C2 Din
* 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
(c) Motorola, Inc. 1998 MOTOROLA
MC145026*MC145027*MC145028*SC41343*SC41344 1
RS
RTC CTC
TE
11 14
12 13 3-PIN OSCILLATOR AND ENABLE
/4 DIVIDER
DATA SELECT AND BUFFER
15 D out
9 A1 A2 A3 A4 A5 A6/D6 A7/D7 A8/D8 A9/D9 1 2 3 4 5 6 7 9 10
RING COUNTER AND 1-OF-9 DECODER 8 7 6 5 4 3 21
TRINARY DETECTOR
VDD = PIN 16 VSS = PIN 8
Figure 1. MC145026 Encoder Block Diagram
11
VT
4-BIT SHIFT REGISTER
15 14 LATCH 13 12
CONTROL LOGIC
D6 D7 D8 D9
SEQUENCER CIRCUIT 5 A1 A2 A3 A4 A5 1 2 3 4 5 C1 7 R1 DATA EXTRACTOR 6 C2 10 R2 9 Din 4 3 2 1
VDD = PIN 16 VSS = PIN 8
Figure 2. MC145027 Decoder Block Diagram
MC145026*MC145027*MC145028*SC41343*SC41344 2
MOTOROLA
CONTROL LOGIC
11
VT
9 A1 A2 A3 A4 A5 1 2 3 4 5
8
7
SEQUENCER CIRCUIT 6 5 4
3
2
1 9-BIT SHIFT REGISTER
DATA EXTRACTOR C1 7 R1 6 C2 10 R2
9
Din
A6 15 A7 14 A8 13 A9 12
VDD = PIN 16 VSS = PIN 8
Figure 3. MC145028 Decoder Block Diagram
MAXIMUM RATINGS* (Voltages Referenced to VSS)
Rating VDD VDD Vin Vout Iin Iout PD Tstg TL Symbol DC Supply Voltage (except SC41343, SC41344) DC Supply Voltage (SC41343, SC41344 only) DC Input Voltage DC Output Voltage DC Input Current, per Pin DC Output Current, per Pin Power Dissipation, per Package Storage Temperature Lead Temperature, 1 mm from Case for 10 Seconds Value - 0.5 to + 18 - 0.5 to + 10 - 0.5 to VDD + 0.5 - 0.5 to VDD + 0.5 10 10 500 - 65 to + 150 260 Unit V V V V mA mA mW C C 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.
* 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.
MOTOROLA
MC145026*MC145027*MC145028*SC41343*SC41344 3
ELECTRICAL CHARACTERISTICS -- MC145026*, MC145027, and MC145028 (Voltage Referenced to VSS)
Guaranteed Limit VDD V (Vin = VDD or 0) 5.0 10 15 5.0 10 15 5.0 10 15 5.0 10 15 5.0 5.0 10 15 5.0 10 15 5.0 10 15 15 - 40C Min -- -- -- 4.95 9.95 14.95 -- -- -- 3.5 7.0 11 - 2.5 - 0.52 - 1.3 - 3.6 0.52 1.3 3.6 -- -- -- -- Max 0.05 0.05 0.05 -- -- -- 1.5 3.0 4.0 -- -- -- -- -- -- -- -- -- -- -- -- -- 0.3 Min -- -- -- 4.95 9.95 14.95 -- -- -- 3.5 7.0 11 - 2.1 - 0.44 - 1.1 - 3.0 0.44 1.1 3.0 3.0 16 35 -- 25C Max 0.05 0.05 0.05 -- -- -- 1.5 3.0 4.0 -- -- -- -- -- -- -- -- -- -- 11 60 120 0.3 Min -- -- -- 4.95 9.95 14.95 -- -- -- 3.5 7.0 11 - 1.7 - 0.36 - 0.9 - 2.4 0.36 0.9 2.4 -- -- -- -- 85C Max 0.05 0.05 0.05 -- -- -- 1.5 3.0 4.0 V (Vout = 0.5 or 4.5 V) (Vout = 1.0 or 9.0 V) (Vout = 1.5 or 13.5 V) IOH High-Level Output Current (Vout = 2.5 V) (Vout = 4.6 V) (Vout = 9.5 V) (Vout = 13.5 V) IOL Low-Level Output Current (Vout = 0.4 V) (Vout = 0.5 V) (Vout = 1.5 V) Iin Input Current -- TE (MC145026, Pull-Up Device) Input Current RS (MC145026), Din (MC145027, MC145028) Input Current A1 - A5, A6/D6 - A9/D9 (MC145026), A1 - A5 (MC145027), A1 - A9 (MC145028) Input Capacitance (Vin = 0) Quiescent Current -- MC145026 -- -- -- -- -- -- 1.0 A -- -- -- -- mA -- -- -- mA Unit Ui V
Symbol S bl VOL
Characteristic Ch ii Low-Level Output Voltage
VOH
High-Level Output Voltage
(Vin = 0 or VDD)
V
VIL
Low-Level Input Voltage (Vout = 4.5 or 0.5 V) (Vout = 9.0 or 1.0 V) (Vout = 13.5 or 1.5 V)
V
VIH
High-Level Input Voltage
Iin Iin
A A
5.0 10 15 -- 5.0 10 15 5.0 10 15 5.0 10 15 5.0 10 15
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
110 500 1000 7.5 0.1 0.2 0.3 50 100 150 200 400 600 400 800 1200
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- pF A
Cin IDD
IDD
Quiescent Current -- MC145027, MC145028
A
Idd
Dynamic Supply Current -- MC145026 (fc = 20 kHz) Dynamic Supply Current -- MC145027, MC145028 (fc = 20 kHz)
A
Idd
A
* Also see next Electrical Characteristics table for 2.5 V specifications.
MC145026*MC145027*MC145028*SC41343*SC41344 4
MOTOROLA
ELECTRICAL CHARACTERISTICS -- MC145026 (Voltage Referenced to VSS)
Guaranteed Limit VDD V 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 - 40C Min -- 2.45 -- 2.2 0.28 0.22 -- -- -- -- Max 0.05 -- 0.3 -- -- -- -- -- -- -- Min -- 2.45 -- 2.2 0.25 0.2 0.09 -- -- -- 25C Max 0.05 -- 0.3 -- -- -- 1.8 25 0.05 40 Min -- 2.45 -- 2.2 0.2 0.16 -- -- -- -- 85C Max 0.05 -- 0.3 -- -- -- -- -- -- -- Unit Ui V V V V mA mA A A A A
Symbol S bl VOL VOH VIL VIH IOH IOL Iin Iin IDD Idd
Characteristic Ch ii Low-Level Output Voltage High-Level Output Voltage Low-Level Input Voltage High-Level Input Voltage High-Level Output Current Low-Level Output Current Input Current (TE -- Pull-Up Device) Input Current (A1-A5, A6/D6-A9/D9) Quiescent Current Dynamic Supply Current (fc = 20 kHz) (Vin = 0 V or VDD) (Vin = 0 V or VDD) (Vout = 0.5 V or 2.0 V) (Vout = 0.5 V or 2.0 V) (Vout = 1.25 V) (Vout = 0.4 V)
ELECTRICAL CHARACTERISTICS -- SC41343 and SC41344 (Voltage Referenced to VSS)
Guaranteed Limit VDD V 2.8 5.0 10 2.8 5.0 10 2.8 5.0 10 2.8 5.0 10 2.8 5.0 10 2.8 5.0 10 10 2.8 5.0 10 -- 2.8 5.0 10 2.8 5.0 10 - 40C Min -- -- -- 2.75 4.95 9.95 -- -- -- 1.96 3.5 7.0 - 0.73 - 0.59 - 1.3 0.35 0.8 3.5 -- -- -- -- -- -- -- -- -- -- -- Max 0.05 0.05 0.05 -- -- -- 0.84 1.5 3.0 -- -- -- -- -- -- -- -- -- 0.3 -- -- -- -- -- -- -- -- -- -- Min -- -- -- 2.75 4.95 9.95 -- -- -- 1.96 3.5 7.0 - 0.7 - 0.5 - 1.1 0.3 0.6 2.9 -- -- -- -- -- -- -- -- -- -- -- 25C Max 0.05 0.05 0.05 -- -- -- 0.84 1.5 3.0 -- -- -- -- -- -- -- -- -- 0.3 30 140 600 7.5 60 75 150 300 500 1000 Min -- -- -- 2.75 4.95 9.95 -- -- -- 1.96 3.5 7.0 - 0.55 - 0.41 - 0.9 0.24 0.4 2.3 -- -- -- -- -- -- -- -- -- -- -- 85C Max 0.05 0.05 0.05 -- -- -- 0.84 1.5 3.0 V (Vout = 0.5 V or 2.3 V) (Vout = 0.5 V or 4.5 V) (Vout = 1.0 V or 9.0 V) IOH High-Level Output Current (Vout = 1.4 V) (Vout = 4.5 V) (Vout = 9.0 V) IOL Low-Level Output Current (Vout = 0.4 V) (Vout = 0.5 V) (Vout = 1.0 V) Iin Iin Input Current -- Din Input Current A1 - A5 (SC41343) A1 - A9 (SC41344) Input Capacitance (Vin = 0) Quiescent Current -- -- -- 1.0 -- -- -- -- -- -- -- -- -- -- A A -- -- -- mA -- -- -- mA Unit Ui V
Symbol S bl VOL
Characteristic Ch ii Low-Level Output Voltage (Vin = 0 V or VDD)
VOH
High-Level Output Voltage
(Vin = 0 V or VDD)
V
VIL
Low-Level Input Voltage (Vout = 2.3 V or 0.5 V) (Vout = 4.5 V or 0.5 V) (Vout = 9.0 V or 1.0 V)
V
VIH
High-Level Input Voltage
Cin IDD
pF A
Idd
Dynamic Supply Current (fc = 20 kHz)
A
MOTOROLA
MC145026*MC145027*MC145028*SC41343*SC41344 5
SWITCHING CHARACTERISTICS -- MC145026*, MC145027, and MC145028 (CL = 50 pF, TA = 25C)
Symbol S bl tTLH, tTHL Characteristic Ch ii Output Transition Time Figure No. 4,8 Guaranteed Limit VDD 5.0 10 15 5.0 10 15 5.0 10 15 5.0 10 15 5.0 10 15 5.0 10 15 Min -- -- -- -- -- -- -- -- -- 0.001 0.001 0.001 1.0 1.0 1.0 65 30 20 Max 200 100 80 15 15 15 15 5.0 4.0 2.0 5.0 10 240 410 450 -- -- -- Unit Ui ns
tr
Din Rise Time -- Decoders
5
s
tf
Din Fall Time -- Decoders
5
s
fosc
Encoder Clock Frequency
6
MHz
f
Decoder Frequency -- Referenced to Encoder Clock
12
kHz
tw
TE Pulse Width -- Encoders
7
ns
* Also see next Switching Characteristics table for 2.5 V specifications.
SWITCHING CHARACTERISTICS -- MC145026 (CL = 50 pF, TA = 25C)
Symbol S bl tTLH, tTHL fosc tw Characteristic Ch ii Output Transition Time Encoder Clock Frequency TE Pulse Width Figure No. 4, 8 6 7 Guaranteed Limit VDD 2.5 2.5 2.5 Min -- 1.0 1.5 Max 450 250 -- Unit Ui ns kHz s
SWITCHING CHARACTERISTICS -- SC41343 and SC41344 (CL = 50 pF, TA = 25C)
S bl Symbol tTLH, tTHL Ch ii Characteristic Output Transition Time Figure No. 4, 8 Guaranteed Limit VDD 2.8 5.0 10 2.8 5.0 10 2.8 5.0 10 2.8 5.0 10 Min -- -- -- -- -- -- -- -- -- 1.0 1.0 1.0 Max 320 200 100 15 15 15 15 15 5.0 100 240 410 Ui Unit ns
tr
Din Rise Time
5
s
tf
Din Fall Time
5
s
f
Decoder Frequency -- Referenced to Encoder Clock
12
kHz
MC145026*MC145027*MC145028*SC41343*SC41344 6
MOTOROLA
ANY OUTPUT
90% 10% tTLH tTHL Din 90% 10%
tf
tr VDD VSS
Figure 4.
Figure 5.
1 / fosc TE RTC 50% tw 50%
VDD VSS
Figure 6.
Figure 7.
TEST POINT DEVICE UNDER TEST OUTPUT CL*
* Includes all probe and fixture capacitance.
Figure 8. Test Circuit
MOTOROLA
MC145026*MC145027*MC145028*SC41343*SC41344 7
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) allowing 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 immediately 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 be hardwired to VDD. If only a low state is obtained, the input is assumed to be hardwired to VSS. If both a high and a low 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 A at a 5 V supply level, 500 A at 10 V, and 1 mA at 15 V. 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 encoder 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 sequence begins. The inputs are then sequentially selected, and determinations are made as to the input logic states. This information is serially transmitted via the Dout pin. MC145027 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 until no input signal is received for four data periods (see Figure 10). Although the address information may be encoded in trinary, the data information must be either a 1 or 0. A trinary (open) data line is decoded as a logic 1. MC145028 This decoder operates in the same manner as the MC145027 except that nine address lines are used and no
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 received before a VT output signal is issued. The MC145028 allows 19,683 addresses when trinary levels are used. 512 addresses are possible when binary levels are used.
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 Dout pin. RS, CTC, RTC (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 RS input and the RTC and CTC pins should be left open. TE Transmit Enable (Pin 14) 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 Electrical Characteristics table. Dout Data Out (Pin 15) This is the output of the encoder that serially presents the encoded data word. 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. 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). Din Data In (Pin 9) This pin is the serial data input to the decoder. The input voltage must be at CMOS logic levels. The signal source driving this pin must be dc coupled.
MC145026*MC145027*MC145028*SC41343*SC41344 8
MOTOROLA
R1, C1 Resistor 1, Capacitor 1 (Pins 6, 7) 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 R1 x 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 Figures 2 and 3, 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 11): 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.
MOTOROLA
MC145026*MC145027*MC145028*SC41343*SC41344 9
RS 11
CTC 12
RTC 13
INTERNAL ENABLE
This oscillator operates at a frequency determined by the external RC network; i.e., f 1 2.3 RTC CTC (Hz) The value for RS should be chosen to be 2 times RTC. This range ensures that current through RS is insignificant compared to current through RTC. The upper limit for RS must ensure that RS x 5 pF (input capacitance) is small compared to RTC x CTC. For frequencies outside the indicated range, the formula is less accurate. The minimum recommended oscillation frequency of this circuit is 1 kHz. Susceptibility to externally induced noise signals may occur for frequencies below 1 kHz and/or when resistors utilized are greater than 1 M.
for 1 kHz f 400 kHz where: CTC = CTC + Clayout + 12 pF RS 2 RTC RS 20 k RTC 10 k 400 pF < CTC < 15 F
Figure 9. Encoder Oscillator Information
ENCODER PWmin TE 2 WORD TRANSMISSION CONTINUOUS TRANSMISSION
16 18 20 22 24 26 28 30 80 82 84 86 88 90 2 4 6 120 122 178 180 182 184 114 116 118
ENCODER OSCILLATOR (PIN 12)
1ST DIGIT
9TH DIGIT
1ST DIGIT
9TH DIGIT
Dout (PIN 15) HIGH OPEN 1ST WORD ENCODING SEQUENCE LOW 2ND WORD
DECODER VT (PIN 11)
1.1 (R2C2)
DATA OUTPUTS
Figure 10. Timing Diagram
MC145026*MC145027*MC145028*SC41343*SC41344 10
MOTOROLA
ENCODER OSCILLATOR (PIN 12) ENCODED "ONE" Dout (PIN 15) ENCODED "ZERO" ENCODED "OPEN"
DATA PERIOD
Figure 11. Encoder Data Waveforms
500
f max (kHz) (REF. TO ENCODER CLOCK)
400 VDD = 15 V VDD = 10 V
300
200 VDD = 5 V
100
10
20
30
40
50
Clayout (pF) ON PINS 1 - 5 (MC145027); PINS 1 - 5 AND 12 - 15 (MC145028)
Figure 12. fmax vs Clayout -- Decoders Only
MOTOROLA
MC145026*MC145027*MC145028*SC41343*SC41344 11
NO
HAS THE TRANSMISSION BEGUN? YES
DOES THE 5-BIT ADDRESS MATCH THE ADDRESS PINS? YES STORE THE 4-BIT DATA
NO
DISABLE VT ON THE 1ST ADDRESS MISMATCH
DOES THIS DATA MATCH THE PREVIOUSLY STORED DATA? YES IS THIS AT LEAST THE 2ND CONSECUTIVE MATCH SINCE VT DISABLE? YES LATCH DATA ONTO OUTPUT PINS AND ACTIVATE VT
NO
DISABLE VT ON THE 1ST DATA MISMATCH
NO
HAVE 4-BIT TIMES PASSED? NO
YES
DISABLE VT
NO
HAS A NEW TRANSMISSION BEGUN? YES
Figure 13. MC145027 Flowchart
MC145026*MC145027*MC145028*SC41343*SC41344 12
MOTOROLA
NO
HAS THE TRANSMISSION BEGUN? YES
DOES THE ADDRESS MATCH THE ADDRESS PINS? YES
NO
DISABLE VT ON THE 1ST ADDRESS MISMATCH AND IGNORE THE REST OF THIS WORD
IS THIS AT LEAST THE 2ND CONSECUTIVE MATCH SINCE VT DISABLE? YES
NO
ACTIVATE VT
HAVE 4-BIT TIMES PASSED? NO
YES
DISABLE VT
NO
HAS A NEW TRANSMISSION BEGUN?
YES
Figure 14. MC145028 Flowchart
MOTOROLA
MC145026*MC145027*MC145028*SC41343*SC41344 13
MC145027 AND MC145028 TIMING
To verify the MC145027 or MC145028 timing, check the waveforms on C1 (Pin 7) and R2/C2 (Pin 10) as compared to the incoming data waveform on Din (Pin 9). The R-C decay seen on C1 discharges down to 1/3 VDD before being reset to VDD. This point of reset (labelled "DOS" in Figure 15) is the point in time where the decision is made whether the data seen on Din is a 1 or 0. DOS should not be too close to the Din data edges or intermittent operation may occur. The other timing to be checked on the MC145027 and MC145028 is on R2/C2 (see Figure 16). The R-C decay is continually reset to VDD as data is being transmitted. Only between words and after the end-of-transmission (EOT) does R2/C2 decay significantly from VDD. R2/C2 can be used to identify the internal end-of-word (EOW) timing edge which is generated when R2/C2 decays to 2/3 VDD. The internal EOT timing edge occurs when R2/C2 decays to 1/3 VDD. When the waveform is being observed, the R-C decay should go down between the 2/3 and 1/3 VDD levels, but not too close to either level before data transmission on Din resumes. Verification of the timing described above should ensure a good match between the MC145026 transmitter and the MC145027 and MC145028 receivers.
Din
VDD
0V VDD 2/3 C1 1/3 0V
DOS
DOS
Figure 15. R-C Decay on Pin 7 (C1)
EOW VDD 2/3 R2/C2 1/3 0V EOT
Figure 16. R-C Decay on Pin 10 (R2/C2)
MC145026*MC145027*MC145028*SC41343*SC41344 14
MOTOROLA
VDD A1 5 TRINARY ADDRESSES A2 A3 A4 A5 D6 4-BIT BINARY DATA D7 D8 D9
TE
VDD 0.1 F 0.1 F
VDD VDD A1 16 15 Dout Din 9 6 R1 MC145027 OR SC41343 1 2 3 4 5 15 14 13 12 11 A2 A3 A4 A5 D6 D7 D8 D9 VT 5 TRINARY ADDRESSES
14 1 2 3 4 5 6 7 9 10
16
MC145026
13 12 11
RTC CTC
7 C1 10
8
RS
R2
C2 8
fosc = 2.3 RTCCTC R1C1 = 3.95 RTCCTC R2C2 = 77 RTCCTC
1
CTC = CTC + Clayout + 12 pF 100 pF CTC 15 F RTC 10 k; RS 2 RTC R1 10 k C1 400 pF R2 100 k C2 700 pF
REPEAT OF ABOVE REPEAT OF ABOVE
Example R/C Values (All Resistors and Capacitors are 5%)
(CTC = CTC + 20 pF) fosc (kHz) 362 181 88.7 42.6 21.5 8.53 1.71 RTC 10 k 10 k 10 k 10 k 10 k 10 k 50 k CTC 120 pF 240 pF 490 pF 1020 pF 2020 pF 5100 pF 5100 pF RS 20 k 20 k 20 k 20 k 20 k 20 k 100 k R1 10 k 10 k 10 k 10 k 10 k 10 k 50 k C1 470 pF 910 pF 2000 pF 3900 pF 8200 pF 0.02 F 0.02 F R2 100 k 100 k 100 k 100 k 100 k 200 k 200 k C2 910 pF 1800 pF 3900 pF 7500 pF 0.015 F 0.02 F 0.1 F
Figure 17. Typical Application
MOTOROLA
MC145026*MC145027*MC145028*SC41343*SC41344 15
APPLICATIONS INFORMATION
INFRARED TRANSMITTER In Figure 18, the MC145026 encoder is set to run at an oscillator 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 oscillator 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 oscillator 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 section 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. Information on the MC14011UB is in book number DL131/D. The MC74HCU04 and MC74HC4060 are found in book number DL129/D. 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-
detected and filtered by a diode/RC network to extract the data envelope from the burst. Comparator A5 boosts the signal to logic levels compatible with the MC145027/28 data input. The Din pin of these decoders is a standard CMOS 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 feedback path, thus avoiding excessive system noise. The biasing 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 resistor in the emitter of the first 2N5088 and the 1 k resistor feeding A2 may be altered if different gain is required. In general, more gain does not necessarily 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 The above companies may not have the switches in a DIP. For more information, call them or consult eem Electronic Engineers Master Catalog or the Gold Book. Ask for SPDT with center OFF. 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 16
MOTOROLA
V+
SELECT FOR 200 mA TO 300 mA USE OF 2 MLED81s IS OPTIONAL
MLED81 MC14011UB 10 k SEND
MPSA13 OR MPSW13
MC14011UB TE MC145026 RS 9 SWITCHES 220 k CTC 1000 pF RTC 220 k 0.01 F Dout
100 k FOR APPROX. 4 kHz 47 k FOR APPROX. 9 kHz
ADJUST/SELECT FOR f = 50 kHz (APPROX. 100 k)
Figure 18. IRED Transmitter Using RC Oscillator to Generate Carrier Frequency
V+ MC14011UB CLK RESET 1M X1 = 400 kHz CERAMIC RESONATOR PANASONIC EFD-A400K04B OR EQUIVALENT
MC14024 Q3
50 kHZ TO DRIVER TRANSISTOR
X1
V+
MC14011UB
470 pF
470 pF
Dout FROM MC145026
Figure 19. Using a Ceramic Resonator to Generate Carrier Frequency
MOTOROLA
MC145026*MC145027*MC145028*SC41343*SC41344 17
+5 V 10 k 10 F 10 k 2N5086 2N5088 10 k 0.01 F 1 k - A2 100 1 F 6.8 k 2.2 k V1 + 1/4 MC34074 2N5088 A1 10 F 0.01 F 1 mH -- TOKO TYPE 7PA OR 10PA OR EQUIVALENT
22 k
OPTICAL FILTER
V1
1/4 MC34074
+5 V
MC145026*MC145027*MC145028*SC41343*SC41344 18
EE EE
1N914 1N914 100 k - A3 + V2 10 k 1000 pF C1 Din VDD VSS R1 MC145027/28 ADDRESS SWITCHES
4.7 k
0.01 F
1 M 1 M
+ A4 - 1/4 MC34074
1N914
1 k
22 k + A5
1000 pF
47 k
V3
- 1/4 MC34074
390 k FOR APPROX. 4 kHz 180 k FOR APPROX. 9 kHz
+5 V 0.01 F 750 k FOR APPROX. 4 kHz 360 k FOR APPROX. 9 kHz 4.7 k R2/C2 VT DATA OUT MC145027 ONLY 2.2 k 10 F 10 F V3 1.3 V 10 F 2.7 k V2 2.7 V 390 V1 2.5 V
4 9 FOR MC145027 5 FOR MC145028
Figure 20. Infrared Receiver
MOTOROLA
PACKAGE DIMENSIONS
P SUFFIX PLASTIC DIP (DUAL IN-LINE PACKAGE) CASE 648-08 -A-
16 9 NOTES: 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. DIM A B C D F G H J K L M S INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0_ 10 _ 0.020 0.040 MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0_ 10 _ 0.51 1.01
B
1 8
F S
C
L
-T- H G D
16 PL
SEATING PLANE
K
J TA
M
M
0.25 (0.010)
M
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. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 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. MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019
16
9
-B-
1 8
P
8 PL
0.25 (0.010)
M
B
S
G F
K C -T-
SEATING PLANE
R
X 45 _
M D
16 PL M
J
0.25 (0.010)
TB
S
A
S
DIM A B C D F G J K M P R
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. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 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. MILLIMETERS MIN MAX 10.15 10.45 7.40 7.60 2.35 2.65 0.35 0.49 0.50 0.90 1.27 BSC 0.25 0.32 0.10 0.25 0_ 7_ 10.05 10.55 0.25 0.75 INCHES MIN MAX 0.400 0.411 0.292 0.299 0.093 0.104 0.014 0.019 0.020 0.035 0.050 BSC 0.010 0.012 0.004 0.009 0_ 7_ 0.395 0.415 0.010 0.029
-B-
1 8
8X
P 0.010 (0.25)
M
B
M
16X
D
M
J TA
S
0.010 (0.25)
B
S
F R X 45_ C -T-
14X DIM A B C D F G J K M P R
G
K
SEATING PLANE
M
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 specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, 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 applications intended 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 or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola 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 are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. Mfax is a trademark of Motorola, Inc. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado, 80217. 1-303-675-2140 or 1-800-441-2447 JAPAN: Nippon Motorola Ltd.; SPD, Strategic Planning Office; 4-32-1, Nishi-Gotanda; Shinagawa-ku, Tokyo 141, Japan. 81-3-5487-8488
MfaxTM : RMFAX0@email.sps.mot.com - TOUCHTONE 1-602-244-6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, Motorola Fax Back System - US & Canada ONLY 1-800-774-1848 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298 - http://sps.motorola.com /mfax / HOME PAGE : http://motorola.com/sps / CUSTOMER FOCUS CENTER: 1-800-521-6274
MC145026*MC145027*MC145028*SC41343*SC41344 20
MC145026/D MOTOROLA

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