2? features dot matrix replacement for dl1414t 0.145" high, dot matrix character 128 special ascii characters for english, german, italian, swedish, danish, and norwe- gian languages wide viewing angle: x axis 50 , y axis 75 close vertical row spacing, 0.800" centers fast access time, 110 ns at 25 c compact size for hand held equipment built- in memory built-in character generator built-in multiplex and led drive circuitry direct access to each digit independently and asynchronously ttl compatible, 5 volt power low power consumption, 20 ma per charac- ter typical intensity coded for display uniformity extended operating temperature range: ?0 c to +85 c end stackable, 4-character package description the dlr/dlo/dlg1414 is a four digit 5x7 dot matrix display module with a built-in cmos integrated circuit. this display is a drop-in dot matrix replace- ment for the dl1414t with segmented characters. the integrated circuit contains memory, ascii rom decoder, multiplex cir- cuitry and drivers. data entry is asynchronous and random. a display system can be built using any number of dlx1414s since each character in any dlx1414 can be addressed independently and will continue to display the character last stored until replaced by another. system interconnection is very straightforward. the least signi?ant two address bits (a0, a1) are normally connected to the like named inputs of all displays in the system. data lines are connected to all dlx1414s directly and in parallel as is the write line (wr ). the display then will behave as a write only memory. the dlx1414 has several features superior to competitive devices. the character set consists of 128 special ascii characters for english, german, italian, swedish, danish, and norwegian. see appnotes 18, 19, 22, and 23 for additional information. .240 (6.10) ref. .800 (20.32) max. .600 .020 (15.24 .51) .012 (.30) .002 (.05 ) 12 pl. .210 (5.33) part number luminous intensity code .070 (1.78) .003 (.08) 4 pl. .010 (.25) 4 pl. .240 (6.10) eia date code dlx 1414 siemens yyww z .100 (2.54) 10 pl. at seating plane pin indicator . 160 .020 (4.06 .51) .050 (1.27) 4 pl. .095 (2.41) ref. .018 (.46) 12 pl. .0920 (2.34) .1750 (4.45) . 0200 (.51) .1440 (3.66) .700 max. (17.78) .0220 (.56) tolerance: xxx .01 (.254) dimensions in inches (mm) red dlr1414 high efficiency red dlo1414 green dlg1414 .145" 4-character 5 x 7 dot matrix alphanumeric intelligent display with memory/decoder/driver
2? dlr/dlo/dlg1414 maximum ratings dc supply voltage ....................... ?.5 to +7.0 vdc input voltage levels relative to gnd (all inputs) ............. ?.5 to v cc +0.5 vdc operating temperature ..................?0 c to +85 c storage temperature....................?0 c to +100 c maximum solder temperature ........063" (1.59 mm) below seating plane, t<5 sec.................... 260 c relative humidity at 85 c ................................85% optical characteristics spectral peak wavelength red ................................................... 660 nm typ. high ef?iency red (her) ............... 630 nm typ. green ................................................ 565 nm typ. viewing angle (off normal axis) horizontal..................................................... 50 vertical ......................................................... 75 character height........................................... 0.145" time averaged luminous intensity 1 (100% brightness, v cc =5 v) red ............................................ 50 m cd/led typ. her............................................ 60 m cd/led typ. green ......................................... 70 m cd/led typ. led to led intensity matching ........... 1.8:1.0 max. led to led hue matching at v cc =5 v (green only) ..................................... 2 nm max. note 1: peak luminous intensity values can be calculated by multiplying these values by 7. figure 1. top view figure 2. timing characteristics (v cc =4.5 v) pin function pin function 1 d5 data input 7 gnd 2 d4 data input 8 d0 data input (lsb) 3wr write 9 d1 data input 4 a1 digit select 10 d2 data input 5 a0 digit select 11 d3 data input 6v cc 12 d6 data input (msb) 1 2 3 4 5 6 12 11 10 9 8 7 digit digit digit digit 3 2 1 0 note: these waveforms are not edge triggered. t w t as a 0, a1 d 0-d6 wr t ah t acc 2.0 v 0.8 v t ds t dh 2.0 v 0.8 v 2.0 v 0.8 v dc characteristics ac characteristics guaranteed minimum timing parameters at v cc =5.0 v 0.5 v note: 1. t acc =set up time + write time + hold time. parameter ?0 c +25 c +85 c units conditions min. typ. max. min. typ. max. min. typ. max. i cc 4 digits on 20 dots/digit 90 120 80 105 70 95 ma v cc =5 v i cc blank 2.8 4.0 2.3 3.0 2.0 2.5 ma v cc =wr =5 v, v in =0 v i il (all inputs) 30 60 120 25 50 100 20 40 80 ma v in =0.8 v, v cc =5 v v ih 2.0 2.0 2.0 vv cc =5 v 0.5 v v il 0.8 0.8 0.8 v v cc =5 v 0.5 v v cc 4.5 5.0 5.5 4.5 5.0 5.5 4.5 5.0 5.5 v parameter symbol ?0 c +25 c +85 c units address set up time t as 10 10 10 ns address hold time t ah 20 30 40 ns write time t w 60 70 90 ns data set up time t ds 20 30 50 ns data hold time t dh 20 30 40 ns access time (1) t acc 90 110 140 ns
2? dlr/dlo/dlg1414 loading data state table x=don t care figure 3. typical interconnection for 32 characters wr a1 a0 d6 d5 d4 d3 d2 d1 d0 digit 3210 h previously loaded display g r e y l l l h l l l h l hgree l l h h l h l h l hgrue l h l h l l h h l lglue l h h h l l l l h lblue l l h h l l l h l hblee l l l h l h l h h hblew l x x see character code see character set v+ v- address a2 a3 a4 write 74138 a b c g data a ddress d0-d6 7 a0 a1 2 7 6 5 4 3 2 1 0 d31 d28 d27 d24 d23 d20 d19 d16 d15 d12 d11 d8 d7 d4 d3 d0 wr d0-d6 a0-a1
2? dlr/dlo/dlg1414 figure 4. block diagram character set 3 2 1 0 display rows 0 to 6 timing and control logic row control logic & row drivers row decoder ram read logic ram memory rom 7 bit ascii code column data d 6 d 5 d 4 d 3 d 2 d 1 d 0 4480 bits osc 128 counter 7 counter column enable latches and column drivers latches column decoder w r a 0 a 1 write 4 x 7 bit columns 0 to 19 ? ? 128 x 35 bit ascii character decode decoder address ascii code d0 d1 d2 d3 0 0 0 0 0 1 0 0 0 1 0 1 0 0 2 1 1 0 0 3 0 0 1 0 4 1 0 1 0 5 0 1 1 0 6 1 1 1 0 7 0 0 0 1 8 1 0 0 1 9 0 1 0 1 a 1 1 0 1 b 0 0 1 1 c 1 0 1 1 d 0 1 1 1 e 1 1 1 1 f 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 2 3 4 5 6 7 d6 d5 d4 hex 1 . high=1 level. 2. low=0 level. 3. upon power up, device will initialize in a r andom state .
2? dlr/dlo/dlg1414 for further information refer to appnotes 18 and 19 in the cur- rent siemens optoelectronic data book. an alternative to soldering and cleaning the display modules is to use sockets. eighteen pin dip sockets .600" wide with .100" centers work well for single displays. multiple display assem- blies are best handled by longer sip sockets or dip sockets when available for uniform package alignment. socket manu- facturers are aries electronics, inc., frenchtown, nj; garry manufacturing, new brunswick, nj; robinson-nugent, new albany, in; and samtec electronic hardware, new albany, in. for further information refer to appnote 22 in the current sie- mens optoelectronic data book. optical considerations the .145" high characters of the dlx1414 gives readability up to eight feet. the user can build a display that enhances read- ability over this distance by proper ?ter selection . using ?ters emphasizes the contrast ratio between a lit led and the character background. this will increase the discrimi- nation of different characters. the only limitation is cost. remember to take into consideration the ambient lighting envi- ronment for the best cost/bene? ratio for ?ters. incandescent (with almost no green) or ?orescent (with almost no red) lights do not have the ?t spectral response of sunlight. plastic band-pass ?ters are an inexpensive and effective way to strengthen contrast ratios. the dlr1414 is a standard red display and should be matched with long wavelength pass ?- ter in the 600 nm to 620 nm range. for displays of multiple col- ors, neutral density grey ?ters offer the best compromise. the dlo1414 is a high ef?iency red display and should be matched with a long wavelength pass ?ter in the 570 nm to 590 range. the dlg1414 should be matched with a yellow-green band-pass ?ter that peaks at 565 nm. for displays of multiple colors, neutral density gray ?ters offer the best compromise. additional contrast enhancement can be gained by shading the displays. plastic band-pass ?ters with built-in louvers offer the next step up in contrast improvement. plastic ?ters can be improved further with anti-re?ctive coatings to reduce glare. the trade-off is fuzzy characters. mounting the ?ters close to the display reduces this effect. take care not to overheat the plastic ?ter by allowing for proper air ?w. optimal ?ter enhancements are gained by using circular polar- ized, anti-re?ctive, band-pass ?ters. the circular polarizing further enhances contrast by reducing the light that travels through the ?ter and re?cts back off the display to less than 1%. several ?ter manufacturers supply quality ?ter materials. some of them are: panelgraphic corporation, w. caldwell, nj; sgl homalite, wilmington, de; 3m company, visual products division, st. paul, mn; polaroid corporation, polarizer division, cambridge, ma; marks polarized corporation, deer park, ny, hoya optics, inc., fremont, ca. one last note on mounting ?ters: recessing displays and bezel assemblies is an inexpensive way to provide a shading effect in overhead lighting situations. several bezel manufacturers are: r.m.f. products, batavia, il; nobex components, grif?h plas- tic corp., burlingame, ca; photo chemical products of califor- nia, santa monica, ca; i.e.e.-atlas, van nuys, ca. refer to siemens appnote 23 for further information. design considerations for details on design and applications of the dlx1414 using standard bus con?urations in multiple display systems, or parallel i/o devices, such as the 8255 with an 8080 or mem- ory mapped addressing on processors such as the 8080, z80, 6502, 8748, or 6800, refer to appnote 15 in the current siemens optoelectronic data book. electrical & mechanical considerations voltage transient suppression we strongly recommend that the same power supply be used for the display and the components that interface with the dis- play to avoid logic inputs higher than v cc . additionally, the leds may cause transients in the power supply line while they change display states. the common practice is to place .01 mf capacitors close to the displays across v cc and gnd, one for each display, and one 10 mf capacitor for every sec- ond display. esd protection the metal gate cmos ic of the dlx1414 is extremely immune to esd damage. however, users of these devices are encouraged to take all the standard precautions, normal for cmos components. these include properly grounding per- sonnel, tools, tables, and transport carriers that come in con- tact with unshielded parts. where these conditions are not, or cannot be met, keep the leads of the device shorted together or the parts in anti-static packaging. soldering considerations the dlx1414 can be hand soldered with sn63 solder using a grounded iron set to 260 c. wave soldering is also possible following these conditions: preheat that does not exceed 93 c on the solder side of the pc board or a package surface temperature of 85 c. water soluble organic acid ?x (except carboxylic acid) or resin- based rma ?x without alcohol can be used. wave temperature of 245 c 5 c with a dwell between 1.5 sec. to 3.0 sec. exposure to the wave should not exceed tem- peratures above 260 c for ?e seconds at 0.063" below the seating plane. the packages should not be immersed in the wave. post solder cleaning procedures the least offensive cleaning solution is hot d.i. water (60 c) for less than 15 minutes. addition of mild saponi?rs is acceptable. do not use commercial dishwasher detergents. for faster cleaning, solvents may be used. carefully select solvents as some may chemically attack the nylon package. maximum exposure should not exceed two minutes at ele- vated temperatures. acceptable solvents are tf (trichlorotrif- luorethane), ta, 111 trichloroethane, and unheated acetone. note: acceptable commercial solvents are: basic tf, arklone p, genesolve d, blaco-tron tf, freon ta, genesolve da, and blaco-tron ta. unacceptable solvents contain alcohol, methanol, methylene chloride, ethanol, tp35, tcm, tmc, tms+, te, or tes. since many commercial mixtures exist, contact a solvent vendor for chemical composition information. some major solvent man- ufacturers are: allied chemical corporation, specialty chem- ical division, morristown, nj; baron-blakeslee, chicago, il; dow chemical, midland, mi; e.i. dupont de nemours & co., wilmington, de.
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