M58609-04P MITSUBISHI | Alldatasheet

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MS8609-04P, S KEYBOARD ENCODER (JIS CODE STANDARD PRODUCT)

DESCRIPTION

The M58609-04P,S is a keybord encoder for reed | PIN CONFIGURATION (TOP VIEW) switches of terminal equipment. It is fabricated using P- channel aluminum-gate MOS technology and is packaged (5V)Vss [0}e-F, FREQUENCY ‘| TROL A in a 40-pin DIL package. It contains a 3168-bit mask- _|f#EQUENCY CONTROL B hanes [BB+ Xo ) CONTROL - FReque m1 aj programmable read-only memory, and the 8-bit codes NEY CONTROL C iae= By * . ” suit eur S| 1X2 specified in JIS c. 6220. 1969 “Codes for Information contro. Ineut C+] Hal-> x3 To Kevsoand Interchange are stored in the ROM. The output consists PARITY INVERT INPUT PI->[E] Box. { WAR of an 8-bit code and a parity bit. The address is selected parity output (B3+-[] (+ Xs, by the 8-bit and 11-bit ring counters. Be+-(] = [33+ Xe e+G) a [B2)-* xr FEATURES a 2 [e-Yo © TTL/DTL-compatible (except X, Y terminals) cara outputs) Bee Gi] Bes © Two-key rollover operation eZ g [ee © Self-contained clock generator circuit oe Bee Ys clock ge era or cireui Be«fal *+-Ye | FROM © Strobe delay circuit for eliminating key contact bounce 8-8 Bel+-y; } KEYBOARD © External control for output polarity (positive or negative STROBE OUTPUT STO+LB} jee | Borers logic) (OV) Voo Ze © External control for selecting odd or even parity (-12V) Voc @ [2le-Ye [STROBE CONTROL INPUTSTC-+[3] le-Ys DATA STROBE DS|-» [za APPLICATION INVERT INPUT Sie 2e-Yi0 Encoder for full-keyboard terminal equipment Outline 40P1 (M58609-04P) 40S1 (M58609-04S) FUNCTION Outputs (Xo~X;) of the 8-bit ring counter and inputs (YoY to the ring counter and data outputs (B;~Bg) stabilizing Y10) of the 11-bit comparator are wired to the keyboard to _—the selected 9-bit code. The stabilization is indicated by a form an 8x11 (88-cross points) switch matrix. valid signal on the strobe output. A strobe output signal is When the key connected with X; and Yj is depressed, a generated at the time set by the externally controlled delay path is formed between them. When the level of Yj matches _ circuit which receives the coincidence signal. Data outputs that of Xi, which comes from the 8-bit ring counter, the and strobe output remain stable until the key is released. comparator generates a coincidence signal for clock control and delay circuit. This clock control stops the clock signals BLOCK DIAGRAM paar invert inpur ‘STROBE CONTROL INPUT PL stTc ! ~Ovssisvy sto @ voo(ov) stone curr STO @ venue) I 1) ey PaiTy OUTPUT (89 (2) « LJ ef a a Q— 8 4 P—evwt J Le v5 a@-—| & F kK sb = by, a—7 gs -— 3168 (88x49) BIT bP egvsf | 2 F€y; | trom DATA OUTPUTS 4 85 2 MASK.PROGRAMMABLE ROM + gy |] eb fev, | xevwoaro ao) sf 4 FZ) § COB fara ag & — P= yf § 5 ¥3 OUTPUTS 3— Ee b= =| ee Ee 4 Be rSyoou Fg MsMenaMa Poof 208 rer er Se Bes SBE SELECT 8-B1T RING COUNTER CONTROL Fe FREQUENCY circuit Cincure cenenaron| 4 fe ohana ! QUENCY LL LY bobbed joNmO os! s c X1_X6 XS Xq XB X2_X1_ Xo DATA STROBE INVERT INPUT wor ree TO KEYBOARD MATRIX INPUTS % MITSUBISHI ELECTRIC 9-3

MS8609-04P, S KEYBOARD ENCODER (JIS CODE STANDARD PRODUCT) ——— eee FUNCTION (Data Output and Parity Output) The relationships between B,~Bg in the code table andB, Table 1 Relationship between code table and data outputs ~Bs in data outputs are shown in Table 1, and those be- Bib Daa oad Dae ouput iment u tween the Parity output By and the parity bit, in Table 2. code tabie ore Bi~Be og The parity bit in the table is defined as a ‘0’ when the a number of ‘1's in the code B,;~Bsg is odd and a ‘1’ when it is es even. po restive one | Mode selection is shown in Table 3. a es Table 2 Parity output PI Bs es ee a ee a a ee Table 3 Mode selection ie eee ee Seacted mode s c po re ee ee a ee ee CODE TABLE (vis C-6220-1969) a oor ee a Pepe f Po pop pots pop] pasity atr [oto fo Pau toe sr] SS fe foto Ty TP son fs ate eee pe fpot sole tsa etapa ae to Peet }— i} rt te} — 3 tH a bepepope spe pratt pete} —- —-}—- tt 4 fot [rots Pack [sw fa Pepe py [ft Pe tetetal 4 ae a ee [spo foyo ts es can cps pe px | Pee ee ee es ete lq He eee teeta re [ts a et Pe Pop a fw pve ese Pe Cs Tote To [7 pe [ot ote fer [eet ye fe tote pepe fot [is Poa we aa Ae Peet To Te so Se a ee ae Cee is so ee a ee ETT %& Bais an odd parity bit for the 8-bit code (By ~ Bg) Note 1 A! or 0° the code able ndcates that the ouput level goes igh for ‘and low for ‘0 when mut OS! and Fae low-level SSS

9 MITSUBISHI

MS8609-04P, S KEYBOARD ENCODER (JIS CODE STANDARD PRODUCT) ee CODE ARRANGEMENT TABLE a a LT GO SO SO Yo a TO A G0) 2 SL |S MA SE SS 15) 9 A A CT OT A A SL A | vt [sone nT ps son eS {son nr ps ye PS ne 5 SS SF. A SC SO OD 7 T°] LS ES CE SO OD PO; A Ys FS NE SS NS <0 T° 2S CO SS OE SO ae SS RS OT va a a ES a Oh SSO O° TY T8 TS OT C—O Ys poe eno Naas nn ns [3 Ng Naa as ee EN as nen SS SR ve ee a a [3 [ac sn sf (a se 5 tn on aS = cL AC Ww — Y es ee ee oe ee ee ee co a 5 TS A: OS OS - S G a SS N= LS =A c= 0 O10 G1 OO TOT | pot can seen ao ve [eS can seo ne pos Sean se one an se nnn SS OS A SO A a ST ST so an pes sue ees [sr sua en eso [si supe eso sss oe es SYMBOLOGY Row | X/¥/ Mode © coos a a [se | Space eo [area [7 | Question mark [3-1 ave 4 tease Tie Re a | =f Guotation mark umigut ee Tae PCY ett bracken Pave [= [Number sign 23 aiee | ¥ [Yen sign rte Pavare [-$ ~ [ote sen a [| -*[Aposophe. acute accent Pea [aera | [Uncerine sis Favere | Cf ttt parenthesis ea ag | = [Grave vccont 6 0 77872 [| Right parentness Te 3 afore | | + | Astorsk, mutistcaton sgn 2 700 [7/so/e [1 | Separate sign. togcal add sgn 7 74a [arava | [se [roiteece is fae [oY Goreng ere fara] [FP overine togeatretean ——t [e078 [= [Negative son. subtraction sgn [2 743 a7s071= 4.397974 | J -[vapanese penod tot fareva [pegs ea ara meerert | P Ceponese int auotaion mak | 1072 pare | i [semecion a Tayo [=| middie dot tos Tariza |< J tess than sign ae fayare | [tong vowel mark of aara f= | caval sgn 3 713 Pore 072 | | | Necod consonant mark [3704 P7973 [ST orccte ransge i ae) Semi vorcod consonant mark 1318 3373 ‘| MITSUBISHI aa tizerme os

MS8609-04P, S KEYBOARD ENCODER (JIS CODE STANDARD PRODUCT) ABSOLUTE MAXIMUM RATINGS [_es--w t v _d cz o.a--20 Topr | owes tor rome ane rs oe] Store temperature range [orig RECOMMENDED OPERATING CONDITIONS (Ta=— 20~ 75°C. unless otherwise noted) [ ma [nom [Max [veo ['sapvvoise —SSSSSCSCS~sSSCS | [vss | Saxivicine SSS asf A [vi [nowt routves SYS Le SO Fore | Swiov a sore rs [Ron | Seach on meres D0 a ELECTRICAL CHARACTERISTICS (Te=~—20~75°c, vac=—12+1V, Vss=5+0,5V, VOD=OV. unless otherwise noted) Sea _| rere Tet conseone bee me] | VOH(x!) High-level output voltage. Xo ~ X7 [Tous = t00u8 0 vssmes] Nour [Lewitt soon Xe=Xr tata SS | Ri | input eesistance. S.C. DSI and PI Vite [| Ma Pd | Power dsspaton _ Ta=2se 200 mw Cr] put capectonce ee ee es ee Note 2» Current flowing into an IC is positive: out is negative. TIMING DIAGRAM ON (x1, ¥1) Key ST OL (NOTE 4) ON Oy) ey FF] U L

1 BIT Tie

Y OUTPUT) ‘7

1 BIT TIME

(INTERNAL 4 Yi" ourPuT) u ‘STROBE DELAY TIME sTo IL Note 3: DSI="L™ 4. (X), Y1) KEY indeates the key switch thats located at the cross point araire OF Xi ond Yi oF the k in 81~ 8s Teno L_ fol. the Keyboard mot Bs aan output ‘ourPuT --- 5 (Xi, Yi) OUTPUT indicates the code output of the key that is selected the (Xi, Yi (NOTE 5} by tel Kev DATA EFFECTIVE TIME OATA EFFECTIVE TIME —————— SSSSSSSSSSSSSSSSSSSSSSSSSSSSFssssssssesese MITSUBISHI 9-6 ELECTRIC

MS8609-04P, S KEYBOARD ENCODER (JIS CODE STANDARD PRODUCT) FUNCTION TABLES Data (81 ~B9) Invert Strobe (STO) Invert Parity (29) Invert Mode Select DSI | Code table |Data output os! intemal | STO PY Code table] Bg s c (Po @) |(B1~B8s)/(B1~Bs)] | (PD) | Mowe | (Pn) (Pn®) | (Bs) | (n@) @n@) | Pn®) peop Pe) Pee ae) Pee pee poe) ee ea ee poe foo Pow ) Powe Pee a ee be foo fs | ee Note 6 The internal signal of the strobe output (STO) becomes high-level when the strobe signal s generated. TYPICAL APPLICATION CIRCUIT Cautions in Use o-sv 1. Coupling at the Keyboard Matrix Xo xt Depending on the capacitance of the keyboard matrix mr 3 Yio wiring, depressing one key while another is depressed gives e la |s io | rise to capacitance coupling, which may result in repetition iw fPi s Cc e Vos} Ys of the strobe output, the same condition that would occur 7 sto Eee ‘key switch _if a single key were depressed twice. In this case, proceed 8 EM Ys pe as shown in Fig. 1 9 [23 1048” arr 2. N-Key Rollover FYE: ssscos ours Yl ——— = ee This device is for 2-key rollover; when 3 or more keys are es va Beso depressed simultaneously, code output is indeterminate. B: y3 Be + 3. Maximum Chatter Times S00 5 1. With Key Off (txorr) 2 OS! aw Fal 2 txorr is defined as the maximum time that, when a key is. Eeeies a turned on but because of faulty contact, etc. the key input spel aie} signal chatters, the chattering can be disregarded. This Ul lt may vary according to ambient temperature, power supply conditions, etc., but is approximately 100ns. Note 7 Ri =1.5MQ, C1=0.001 uF provides approximately 16ms delay time, 2 With Key On (tkon} 8: Re =75k2, C2 =SOPF (provides approximately 5OkHz clock frequency. Conversely, txon is the maximum time that, when a key is turned off, but the input signal chatters, the chattering condition can be disregarded. . . - when txorrS1/fy tkons100ns Fig. 1 Meas t cou ‘ ‘8 tures against coupling when tkore>1/fg tkonSts10+ tse where: t= clock frequency tsto = strobe delay time 9 tsc = scanning time vobrs vege TT vee - ; - ; vipeege—_| TTT TTT Fig. 2. Timing diagram for maximum chatter time Mssece-ce,s Hee E> ol vfeego TTT TT TT teore torre vege TT TTT TT OFF vege TTT TTT | Hy Xq Xe X49 Xp X00 rope eo—f {EEE ste UI JT | Insert diodes and capacitors (C3~O13 should be approx 50~ 100pF) between the sto 'sto keyboard matrix and the ¥ inputs @atizerne ELECTRIC 9-7

MS8609-04P, S KEYBOARD ENCODER (JIS CODE STANDARD PRODUCT) TYPICAL CHARACTERISTICS ( vca=—12v, voo= 0 v, Vss= 5 V) RESISTANCE VS. CLOCK FREQUENCY VS. ‘STROBE DELAY TIME 120, RESISTANCE ‘Tate [omjber sae TTT [sz] fray ron soot ei | ttt et IN Tt | ear aee Sa an eneee PEN TT 2.7 se ennnen Pt NS 22 oeeeeee ef SRL EEE EH “ELT TT] Moot a ; oO 2 4 6 8 10 o 100 200 300 STROBE DELAY TIME t D( STO) (ms) RESISTANCE R2(kQ) ON RESISTANCE OF OUTPUT DRIVER POWER DISSIPATION VS. VS. POWER SUPPLY VOLTAGE AMBIENT TEMPERATURE BNE . 4200) 100] STING ET i z * = 80 et | IN TT : 150 = 60 PLET NT ) 2 s 2 Sot | | LS : “CELT -* -5 -7 —9 -—11 -13 -15 —17 oD O 20 40 60 80 100 SUPPLY VOLTAGE Vao (V) AMBIENT TEMPERATURE Ta (“C )