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| MCl~19 2-OF-8 KEYPAD-TO-BINARY ENCODER The MC14419 is designed for phone dialer system applications, but finds many applications as a keypad-to-binary encoder. The device contains a 2-of-8 to binary encoder, a strobe generator, and an illegal state detector. The encoder has four row inputs and four column inputs, and is designed to accept inputs from 16 keyswitches arranged in a 4x 4 matrix. For an output on the four data lines, one and only one row along with one and only one column input line must be activated. All other combinations are suppressed by the illegal state detector to eliminate false data output. The strobe generator produces a strobe pulse when any of the 10 keys corresponding output to numerals O through erroneous 9 are depressed. The strobe can be used to eliminate data entry due to contact *,,}tt contact bounce has settled and 80 clock pulses have occurred, the outt' put will be a single strobe pulse equal in width to that of the clock low.#}' $! .<~>,,,, \,..? state. The strobe generator will output one and only one pulse eq,ch j,< time a numerical key is depressed. After the pulse has occurred,,$x+se and bounce due to contact break will not cause another stro@#iQQ15&. 5 ms a~t~~th,$last With a 16 kHz input clock frequency, the pulse occurs .++\,%,. `./\\ bounce. )~ !F,::'k:+> ~<.?, `!%. `i\}. >f,i$ . Suppressed Output for Illegal Input Codes ,>.> "" bounce. For a strobe output to occur, the key row and column input lines must remain stable for 80 clock pulses after activation. When the L SUFFIX CERAMIC PACKAGE CASE 620 P SUFFIX PLASTIC PACKAGE CASE W ORDERING INFORMATION MC14XXX -- suffix L Denotes L = Ceramic P = Plastic 1 2 3 4 5 6 7 8 n PIN ASSIGNMENT RI v~~ 16 R2 Clock 15 R3 R4 ST D4 14 13 cl D3 02 12 11 C2 C3 D1 10 Vss C4 9 This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields; howver, it is advised that normal precautions b taken to avoid application of anv voltage higher than maximum rated voltages to this high impedance circuit. For proper operation it IS recommended constrained to Vout) < VDD. that Vin and VSS < Vout (Vin be or the range MOTOROLA -- INC , lW DS9892 MAXIMUM RATINGS Rating (Voltages referenced to VSS, Pin 8.) Symbol VDD Value +6.0 to -0.5 VDD t 05 to Vss -0.5 10 -40 to +85 -65 to +1 50 Unit Vdc V dc DC Supply Voltage All Inputs Input Voltage, I I V in I mAdc I `c `c DC Current Operating Drain per Pin Temperature Range Range I TA Tstg Storage Temperature ELECTRICAL CHARACTERISTICS VDD \,,* .,. ,. 40c Min 3.0 - 4,99 1.5 1.4 -0.23 0.23 Max 6.0 0.01 -- - -- - -- Min 3,0 -- 4.99 1,5 1.5 -0.20 25C Typ 5.0 0 5.0 Max .< VDD "O" Level "l" Level Vout 6.0,9 ,. Fqg `i,.::~.i. o,@#'t. ` ~ " -- Noise Immunity (AVout Output (VOH (VOL Input <0.8 Vdc) VNH IOH Source Sink !OL IIH +*.*- ..!. `,'~t- $;>.\ ,$s: 4,95 ,, !*.,,, .,.!.. , ::,./: .'.*,:,. 2.25 1,4 ?. 2 ,J~R `*_ 1,5 - _ -0,16 Drive Current = 2.5 Vdc) = 0.4 Vdc) 5.0 5.0 5,0 ,$.y,;f~f'''"~' ` ,8." <\, t\. ,}: o ,2g:':*, "i?~~$8 0.16 - mAdc pAdc pAdc Leakage Current -- 265 -- .-- . >,,,,, "~t\: ,$> .~:!. ~. ..*. 10 250 -- 330 -- 125 -- 215 (Vin = VDD) Pullup Resistor Source Current (Row and Column Inputs) Cin -- -- ,,t., Current IDDS 3.0 5.0 ,>''?4.. )+~. J'" .$ ,)),*X<;+' ~. 6.* t~,,' `~ * lDDs .,> `" ~g~: ,~, .<:,. .( ,,. ~+,:: i \;\&.*?.*, ~~ *,/,), ?,$,. *' ,>, characteri3X~:s~@rilV. ,h.#.\. ~i<. ~ ,:k) 3.0 15 60 ., (Vin = VSS) Input Capacitance (Vin = VSS) Standby Supply IIL 5.0 -- -- - 1.0 5.0 20 - - -- -- -- pF 3.0 15 60 + 3.0 PA 6,0 30 120 pAdc (fclock = 16 kHz, No Keys Depressed) Standby SupPlV Current as a IDDS = 0.09 pA/kHz ~Adc Function of Clock FrequencV* (No Keys Depressed) q The formula given is for the typical Character~@&$~*': Output Rise and Fall Times, DelaV Time, Q,f t~~$$#4 (Figure 1) SVmbol `r,tf tpLH, tpHL PR F VDD 5.0 5.0 Min Tvp 300 1000 Max -- -- Unit ns ns -- -- Propagation Q@$&r~Qolumn Input to Data Output ( Figure 1%$. ~~~~' ,??. \.. > Clock Pulse Freque~&~;@#R& .q~) ".* .L"~,!e, > ,.... , ,,,,, $,>,1 ~ ~ \y,,.. ~ .),"~~ $. 3.0 to 6.0 4.0 16 80 kHz FIGURE 2 - TYPICAL STROBE PULSE DELAY TIMES PRF Clock Frequencv kH Z tST * Strobe Pulse DelaV Time ms ~ *tST= (l/p RF) q 80, with PRF in kHz, tST in m$ MOTOROLA @ Semiconductor Products Inc. FIGURE 3 -STROBE GENERATOR TIMING DIAGRAM I nf Row Key q * R4 R3 R2R1 1110 1110 1110 1110 1101 1101 1101 1101 1o11 1o11 1 011 1 2 3 A 4 5 6 B 7 8 9 c `o n o n 1o11 0...1 1110 1101 1 `1 1I111O n ~ 1010 0000 011 0111 nbinations 1 011 1111 0000 A o 0 0 16 `7 GAS E 6%-05 (PLASTIC) ,0 -+Fk 8,-1 L q --A UNE 1. LEADS WITHIN O.13mm (0.005) RADIUS OF TRUE POSITION AT SEATING PLANE AT MAXIMUM MATERIAL CONDITION. 2. PACKAGE INOEX: NOTCH IN LEAD NDTCH IN CERAMIC OR INK OOT. 3. DIM "VTO CENTER OF LEADS WHEN FDRMED PARALLEL. 4. OIM "A''AND `,B"DO NOT INCLUDE GLASS RUN-OUT, 5. DIM "F" MAY NARROW TO 0.76 mm (0.030) WHERE THE LEAD ENTERS THE CERAMIC BOOY. 1 LEAOSWITHIN013 mm(0.005) ADIUSOFTRUE R POSITION SEATING AT PL4NE AT MAXIMUM MATERIAL CONOITION 2. DIMENSION TO CENTEROF LEADSWHEN ~ FORMED PARALLEL, MOLD 3. ;;~~~SION "B' DOESNOTINCLUOE _. 4, `~ OIMENSION FORFULL LEADS.,,HALF IS LEADSARE OPTIONAL T LEAOPOSITIONS A 1,8, 9,AN016. 5. ROUNDEO CORNERS OPTIONAL, MOTOROLA @ Semiconductor Producb Inc. ,,* FIGURE 4- TYPICAL KEYPAD INTERFACE APPLICATION -- Motorola reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Motorola does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Motorola and@, are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Employment Opportunity/ Affirmative Action Employer. m MOTOROLA Semiconductor Products Inc. q 3501 ED BLUESTEIN BLVD., AUSTIN, TEXAS 78721 A SUBSIDIARY OF MOTOROLA INC. |
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