SC41342 | DigiCamel IC Datasheet

Online Datasheet

Read SC41342 online.

SC41344 MOTOROLA | Alldatasheet

Document overview

Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
PDF pages: 18

Technical content

@ SEMICONDUCTOR So TECHNICAL DATA Encoder and Decoder Pairs MC145027 cmos MC145028 These devices are designed to be used as encoder/decoder pairs in remote con- 1342 trol applications. $C41343 The MC145026 encodes nine lines of information and serially sends this informa- tion upon receipt of a transmit enable (TE) signal. The nine lines may be encoded $C41344 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 interpets five of the trinary digits as an address code. Thus, 243 addresses are possible. Hf binary data is used eo sur at the encoder, 32 addresses are possible. The remaining serial information is inter- Vere Y pLastic DIP peted as four bits of binary data. The valid transmission output (VT) goes high on AVY V CASE 648 the MC145027 when two conditions are met. First, two addresses must be consecu- 16 tively received (in one encoding sequence) which both match the local address. 1 Second, the 4-bits of data must match the last valid data received. The active VT D SUFFIX indicates that the information at the data output pins has been updated. EO $0G The MC145028 decoder treats alll nine trinary digits as an address which allows WO Qereeeee case 7518 19,683 codes. If binary data is encoded, 512 codes are possible. The valid transmis- 1 BUSY sion output (VT) goes high on the MC145028 when two addresses are consecutively received (in one encoding sequence) which both match the local address. pw SUFFIX Operating Temperature Range: ~40° to 85°C 6 soG * Very-Low Standby Current for the Encoder: 300 nA Maximum @ 25°C CASE 7516 * Interfaces with RF, Ultrasonic, or Infrared Modulators and Demodulators # RC Oscillator, No Crystal Required 1 © High External Component Tolerance; Can Use +5% Components © Internal Power-On Reset Forces All Decoder Outputs Low ° on For Infrared Applications, See Applications Note AN1016 RDERING INFORMAT! © Operating Voltage Range: 4.5 to 18 V MC145026P,SC41342P Plastic DIP * Low-Voltage Versions Available — MC145026D, SC41342D SOG Package SC41342: 25 to 18 V Version of the MC145026 Mc145027P. Sc41343P Plastic DIP $C41343: 2.8 to 10 V Version of the MC145027 MolacbovtW ecaia4aDW SOG Peckage $C41344: 2.8 to 10 V Version of the MC 145028, ‘ MC 145028P, SC41344P Plastic DIP PIN ASSIGNMENTS ag 161) Vop adi 16) Vop adi 16) Yop aA2g2 15) DATA OUT A2q2 15) D6 A2g2 18) AG asq3 14D TE 433 14007 asqs 140 a7 Mads 13D Rtc Aas 13) D8 ones 137) AB Ass 120 Cto as qs 12f109 ASgs 42th Ao Ase 116 11D Rs Ay 6 wD Ry g6 fv A707 7 10) AgDS co d7 101 Roo co g7 10) Ryo Vss 48 of] Ags Vgs 8 9 DATAIN Vss 18 9) DATAIN MC145026 MC145027 MC145028 $C41342 ‘SC41343 $C41344 ENCODERS DECODERS DECODERS MOTOROLA CMOS APPLICATION-SPECIFIC DIGITAL-ANALOG INTEGRATED CIRCUITS 6-17

MC145026¢MC145027¢MC145028¢ $C41342¢SC41343¢SC41344 Rs Rte LP ENABLE BUFFER RING COUNTER AND 1-OF-9 DECODER Pere “coo Seo “coor “Toe “4 pees a a al Yd none SIS 6 | Figure 1. MC145026 Encoder Block Diagram i vt CH 3 L Po Fed 3 Cf | g : 5 {> oe it 5 12 eH fps. fp pun a SL

33 Pe 9 DATA

ERE toe dg, et asd Ry ol Uy w 6 19, 4, Vgg = PIN = a Figure 2.MC145027 Decoder Block Diagram a MOTOROLA CMOS APPLICATION-SPECIFIC DIGITAL-ANALOG INTEGRATED CIRCUITS 6-18

Figure 3. MC145028 Decoder Block Diagram

MC145026°MC145027eMC145028¢ $C41342°SC41343°SC41344 ELECTRICAL CHARACTERISTICS — MC145026, MC145027, MC145028, and SC41342* (Voltage Referenced to Vss) | mm | | Ti a VoL | Low-Level Output Voltage 0.05 0.05 005 | Vv (Vin = Vp oF 0) 0.05 0.05 0.05 0.05 0.05 0.05 Vou | High-Level Output Voltage 50 | 495 4.95 4.95 v (Vin = 0 oF Vpp) 1o | 9.95 9.95 9.95 15 | 14.95 14.95 14.95 Vit | Low-Level input Voltage v (Vout = 4.5 oF 0.5 V) 50 15 (Vout = 9.0 oF 1.0 V) 10 3.0 (Vout = 13.5 0 1.5) 15 40 Vin | High-Level Input Voltage v (Vout = 0.5 oF 4.5 V) so | 35 35 35 (Vout = 1.0 oF 9.0 V) to | 70 70 70 (Vout = 1.5 oF 13.5 V) 15 i 11 1 High-Level Output Current (Vout = 2.5 V) so | -25 “24 7 (Vout = 9.5 V) 10 | -13 a ~09 (Vout = 13.5 V) 15 | 36 -3.0 -24 to. | Low-Level Output Current (Vout = 0.5 V) 10 09 (Vout = 1.5 V) 15 24 Input Current — TE pA (MC145026 and SC41342, Pullup Device) Input Current 15 yA Rg (MC145026 and SC41342), Data In (MC'145027, MC145028) Input Current yA A1-A5, A6/D6-A9/D9 (MC 145026 and SC41342), 5.0 110 ‘A1-A5 (MC145027), 10 ca A1-A9 (MC 145028) 15 +500 +1000 a Pm ee HEBBREEe Quiescent Current — MC145027, MC145028, 50 yA 100 150 Dynamic Supply Current — MC145026 and SC41342 200 yA (fe = 20 kHz) 400 600 Dynamic Supply Current — MC145027, MC145028, 400 yA {fe = 20 kHz) 800 1200 “Also see next Electrical Characteristics table for 2.5 V specifications. MOTOROLA CMOS APPLICATION-SPECIFIC DIGITAL-ANALOG INTEGRATED CIRCUITS 620

MC145026¢MC145027°MC145028¢ $C41342°SC41343°SC41344 ELECTRICAL CHARACTERISTICS — SC41342 (Voltage Referenced to Vss) vp | we [ase | ase | | win Tmax [min [max | win | Mex | Vou | Low-Level Output Voltage v (Vin = 0 V oF Vp) Vou | High-Level Output Voltage v (Vin = 0 V or VoD) Vit | Low-Level input Voltage Vv (Vout = 0.5 Vor 2.0 V) ViH_ | High-Level input Voltage Vv (Vout = 0.5 Vor 2.0 V) High-Level Output Current (Vout = 1.25 V) lo. | Low-Level Output Current (Vout = 0.4 V) [a rotomate—ramomn ts | = | = fom te |= [= [| [in recimencaram aoeswoy fs |- | -]-[a=]-]-|m| | too | ovescortcuront es PP = fos fT | [| brani scare 208 Pes [= T= f= fe T= tT MOTOROLA CMOS APPLICATION-SPECIFIC DIGITAL-ANALOG INTEGRATED CIRCUITS 621

MC145026eMC145027°MC145028¢ $C41342°SC41343°SC41344 SWITCHING CHARACTERISTICS — MC145026, MC145027, MC145028, and SC41342* (C,_ = 50 pF, Ta = 25°C) tTLH. Output Transition Time 200 TTHL (Figures 4 and 8) 100 Data In Rise Time (Decoders) us (Figure 5) Data in Fall Time (Decoders) us (Figure 5) Encoder Clock Frequency 0.001 MHz (Figure 6) 0.001 0.001 Decoder Frequency (Referenced to Encoder Clock) 240 (Figure 14) 410 450 w TE Pulse Width (Encoders) (Figure 7) “Also see next Switching Characteristics table for 2.5 V specifications. SWITCHING CHARACTERISTICS — SC41342 (C = 50 pF, Ta = 25°C) tTLH. ‘Output Transition Time tTHL (Figures 4 and 8) Encoder Clock Frequency (Figure 6) ly TE Pulse Width (Figure 7) SWITCHING CHARACTERISTICS — SC41343 and SC41344 (C= 50 pF, Ta = 25°C) tTLH. Output Transition Time 28 320 TTHL (Figures 4 and 8) 50 200 10 100 Data In Rise Time Data In Fall Time 28 us (Figure 5) 50 Decoder Frequency (Referenced to Encoder Clock) 28 100 (Figure 14) 50 240 10 410 MOTOROLA CMOS APPLICATION-SPECIFIC DIGITAL-ANALOG INTEGRATED CIRCUITS 6-23

MC145026°MC145027°MC145028¢ $C41342°SC41343°SC41344 OPERATING CHARACTERISTICS The MC145028 allows 19,683 addresses when trinary lev- els are used. 512 addresses are possible when binary levels are used. MC145026 The encoder serially transmits trinary data as defined by the PIN DESCRIPTIONS state of the A1 through AS and A6/D6 through A9/D9 input pins. These pins may be in either of three states (low, high, or MC145026 ENCODER open) allowing 19,683 possible codes. Thetransmitsequence is initiated by a lowlevelon the TE input pin. Eachtimethe TE --A1 through AS, A6/D6 through A9/D9 (Pins 1 through 7, input is forced low, the encoder outputs two identical data. 9 4nd 10) words. Between the two data words, no signals sent for three ‘These address/data inputs are encoded and the datais sent data periods. If the TE input is kept low, the encoder continu- _erially from the encoder via the data out pin. ously transmits the data word. See Figure 10. Each transmitted trinary digit is encoded into pulses (See Rs, Cr, Rc (Pins 11, 12, and 13) Figure 11). A logic zero (low) is encoded as two consecutive These pins are part of the oscillator section of the encoder. shortpulses, alogicone (high)astwoconsecutivelongpulses, See Figure 9. and an open (high-impedance) as a long pulse followed by a ¥ an external signal source is used instead of the internalos- short pulse. The input state is determined by using a weak cillator, it should be connected to the Rg input andthe Rt¢ and “output” device to try to force each input first low, then high. If CT.¢ pins should be left open. only a high state results from the two tests, the input is as- sumed to be hardwired to Vpp. only alowstate isobtained, TE (Pin 14) Oe a eta mact ns ens {otha highand This active-low transmit enable input initiates transmission of the supply voltage as shown inthe Electrical Characteristics Characteristics table Table. The weak “output” device sinks/sources upto 110 pA at ° a5 V supply level, 500 pA at 10 V, and 1 mA at 15 V. Data Out (Pin 15) The TE input has an internal pullup device so that a simple this is th A switch maybe used toforce the inputiow. While TE ishigh, the nis 6 the output of the encoder that serialy presents the encoder is completely disabled, the oscillator is inhibited, and . the current drain is reduced to quiescent current. When TE is Vgs (Pin 8) brought low, the oscillator is started, and the transmit se- . . oo quence begins. The inputs are then sequentially selected, and The most-negative supply potential. This pin is usually determinations are made as to the input logic states. This in- 9'und. formation is serially transmitted via the Data Out pin. Vpp (Pin 16) MC145027 The most-positive power supply pin. This decoder recaives the serial data from the encoder and outputs the data, if it is valid. The transmitted data, consisting MC145027 AND MC145028 DECODERS of two identical words, is examined bit by bit during reception. The first five trinary digits are assumedto be the address. Ifthe 1 through AS (Pins 1 through 5) — MC145027 received address matches the local address, next four (data) A1 through AQ (Pins 1 through 5, 15, 14, 13, and 12) — bits are internally stored, but are not transferred to the output ~-—-« MC 145028 data latch. As the second encoded word is received, the ad- These are the local address inputs. The states of these pins dress must again match. Ifa match occurs, the new data bits must match the appropriate encoder inputs for the VT pinto go are checked against the previously stored data bits. Hthetwo _—high. The local address may be encoded with trinary or binary nibbles of data (four bits each) match, the dataistransferredto — data. the output data latch by VT and remains until new data re- places it. Atthe same time, the VT output pin is brought high —_D6 through D9 (Pins 15, 14, 13, and 12) - MC145027 and remains high until an error is received or until no input sig- ONLY nal is received for four data periods. See Figure 10. These outputs present the binary information that is on en- Although the address information may be encoded intrinary, coder inputs A6/D6 through A9/D9. Only binary data is ac- the data information must be either aone or azero. Atrinary —_nowledged: a trinary open at the MC145026 encoder is de- (open) data line is decoded as a logic one. coded as a high level (logic 1). MC145028 Ry, Cy (Pins 6, 7) This decoder operates in the same manner as the As shown in Figures 2 and 3, these pins accept a resistor MC145027 except that nine address lines are used and no and capacitor that are used to determine whether a narrow data output is available, The VT outputs usedto indicatethat pulse or wide pulse has been received. The time constant Ry x avalid address has been received. Fortransmission security, 4 should be set to 1#72 encoder clock periods: two identical transmitted words must be consecutively re- Ry Cy 3.95 RTC Cte. caived before avalid transmission output (VT) signalis issued. MOTOROLA CMOS APPLICATION-SPECIFIC DIGITAL-ANALOG INTEGRATED CIRCUITS 625

Figure 12. MC145027 Flowchart

Figure 13. MC145028 Flowchart MOTOROLA CMOS APPLICATION-SPECIFIC DIGITAL-ANALOG INTEGRATED CIRCUITS.

Figure 14. fmax V8 Clayout — Decoders Only

Figure 15. Typical Application

MC145026¢MC145027°MC145028¢ $C41342°SC41343°SC41344 APPLICATIONS INFORMATION Infrared Transmitter Infrared Receiver In Figure 16, the MC145026 encoders set to run at an oscil- The receiver in Figure 18 couples an IR-sensitive diode to lator frequency of about 4 kHz to 9 KHz. Thus, the time re- input preamp At, followed by bandpass ampiifier A2 with a quiredforacomplete two-word encoding sequence is about20 _gain of about 10. Limiting stage A3 follows, with an output of ms to 40 ms. The data output from the encoder gates an RC about 800 mVp-p. The limited 50 kHz burst is detected by oscillator running at 50 kHz; the oscillator shown starts rapidly comparator A4 that passes only positive pulses, and peak-de- enough to be used in this application. When the "send" button _tected and filtered by a diode/RC network to extract the data is not depressed, both the MC145026 and oscillator are in a envelope from the burst. Comparator AS boosts the signal to low-power standby state. The RC oscillatorhas tobetrimmed —_logic levels compatible with the MC145027/8 data input. The for 50 kHz and has some drawbacks forfrequency stability. A datainpinof these decoders is a standard CMOS high-imped- superior system uses aceramic resonator oscillatorrunningat ance input which must NOT be allowed to tloat. Therefore, di- 400kHz. This oscillator feeds a divider as shown in Figure 17. ect coupling from AS to the decoder input is utilized. The unusad inputs of the MC14011UB must be grounded. Shielding should be used on at least At and A2, with good ‘The MLEDS1 IRED is driven with the 50kHz square wave at ground and high-sensitivity circuit layout techniques applied. about 200 mA to 300 mA to generate the carrior. Hf desired, 2 For operation with supplies higher than +5 V, limiter Ad's IREDs wired in series can be used. (See Application Note _positive output swing needs to be limited to3 VtoS V. This is ‘AN1016for more information.) The bipolar IRED switchshown accomplished via adding a zener diode in the negative in Figure 16 offers two advantages over a FET. First, a logic feedback path, thus avoiding excessive system noise. The FET has too much gate capacitance for the MC14011UB to _biasing resistor stack should be adjusted such that VSis 1.25 V drive without waveform distortion. Second, the bipolar drive 0.1.5 V. permits lower supply voltages, which are an advantage in por- This system works up to a range of about 10 meters. Tho tabla battery-powered applications. gains of the system may be adjusted to suit the individual de- Thecontgyae shownia Figure 16 operates: over asupply sign needs. The 100 Q resistor in the emitter of the first range of 4.5 Vto 18 V. A low-voltage system which operates 25088 and the 1 kA resistor feeding A2 may be altered if down to 2.5 V could be realized i the SC41342 (the low-vol- _Giferent gains requited. In general, more gain does not nec age versionof the MC 145026)is usedinlieuoltheMC145026. ——_gssarily result in increased range. This is due to noise floor The oscillator section of aMC74HC4060is used in place ofthe imitations. The designer should increase transmitter power MC14011UB, The data output of the SC41342is invertedand and/or increase receiver aperature with fresnal lensing to fed to the reset pin of the MC74HC4060. Alternately, the greatly improve range. See applications note AN1016 for ad- MC74HCU04 could be used for the oscillator. Sitional information. Information on the MC14011 UBis in book number DL131/D. Information on the MC34074 is in data book DL128/0. The MC74HCU04 and MC74HC4060 are found in book num- ber DL129/0. MOTOROLA CMOS APPLICATION-SPECIFIC DIGITAL-ANALOG INTEGRATED CIRCUITS 632

5 MPSW13

Figure 16. IRED Transmitter Using RC Oscillator

50 KHZ TO

470 F T 470 pF T FROM MC145026

Figure 17. Using a Ceramic Resonator to Generate

9 FOR MC145027 10

Figure 18. Infrared Receiver

Product Information

SC41342 specifications and overview.

Summary

Encoder and Decoder Pairs CMOS

Description

Encoder and Decoder Pairs CMOS

Source title SC41342 Datasheet(PDF) - Motorola, Inc

Related Parts

More parts from the same family.

Browse manufacturer