Version 4 SHEET 1 3000 2120 WIRE 1616 -176 1376 -176 WIRE 1808 -176 1680 -176 WIRE 1744 0 1680 0 WIRE 1376 16 1376 -176 WIRE 1616 16 1376 16 WIRE 1632 64 1632 48 WIRE 1632 64 1440 64 WIRE 1440 80 1440 64 WIRE 1440 176 1440 160 WIRE 1744 256 1680 256 WIRE 1376 272 1376 16 WIRE 1616 272 1376 272 WIRE 1744 576 1680 576 WIRE 1376 592 1376 272 WIRE 1376 592 976 592 WIRE 1616 592 1376 592 WIRE 976 672 976 592 WIRE 976 816 976 752 WIRE 1744 880 1680 880 WIRE 1376 896 1376 592 WIRE 1616 896 1376 896 WIRE 1968 1200 1504 1200 WIRE 1504 1216 1504 1200 WIRE 1968 1232 1968 1200 WIRE 1504 1328 1504 1296 WIRE 1680 1328 1504 1328 WIRE 1776 1328 1744 1328 WIRE 1872 1328 1840 1328 WIRE 1872 1360 1872 1328 WIRE 1968 1360 1968 1312 WIRE 1504 1408 1504 1328 WIRE 2528 1408 2400 1408 WIRE 2528 1424 2528 1408 WIRE 2400 1440 2400 1408 WIRE 1920 1472 1888 1472 WIRE 2016 1472 1984 1472 WIRE 2128 1472 2096 1472 WIRE 2528 1536 2528 1504 WIRE 1376 1552 1376 896 WIRE 1504 1552 1504 1472 WIRE 1504 1552 1376 1552 WIRE 1616 1552 1504 1552 WIRE 1888 1568 1888 1472 WIRE 1888 1568 1680 1568 WIRE 1920 1568 1888 1568 WIRE 2016 1568 1984 1568 WIRE 2128 1568 2128 1472 WIRE 2128 1568 2096 1568 WIRE 2400 1568 2400 1520 WIRE 2400 1568 2128 1568 WIRE 2400 1600 2400 1568 WIRE 2400 1728 2400 1680 WIRE 1744 1888 1472 1888 WIRE 1472 1984 1472 1888 WIRE 1520 1984 1472 1984 WIRE 2064 1984 1680 1984 WIRE 1376 2032 1376 1552 WIRE 1520 2032 1376 2032 WIRE 1744 2032 1744 1888 WIRE 1744 2032 1696 2032 FLAG 976 816 0 FLAG 2400 1728 0 FLAG 2528 1536 0 FLAG 1744 576 tau IOPIN 1744 576 Out FLAG 1744 880 rcout IOPIN 1744 880 Out FLAG 1744 256 trf IOPIN 1744 256 Out FLAG 1808 -176 strig IOPIN 1808 -176 Out FLAG 1968 1360 0 FLAG 2064 1984 df_qout IOPIN 2064 1984 Out FLAG 1744 1888 _q FLAG 1872 1360 0 FLAG 1744 0 with_offset IOPIN 1744 0 Out FLAG 1440 176 0 SYMBOL digital\\and 1648 1488 R0 WINDOW 39 16 176 Left 2 WINDOW 123 16 140 Left 2 SYMATTR SpiceLine Td=15n Trise=10n Tfall=10n SYMATTR Value2 Vhigh=4 Vlow=0 SYMATTR InstName A1 SYMATTR Value Ref=1.1 SYMATTR SpiceLine2 tripdt=5n SYMBOL voltage 976 656 R0 SYMATTR InstName V1 SYMATTR Value pulse(0 5 0 250n 250n 250n 500n) SYMBOL res 2384 1584 R0 SYMATTR InstName R1 SYMATTR Value 250 SYMBOL digital\\and 1648 528 R0 WINDOW 39 16 176 Left 2 WINDOW 123 16 144 Left 2 SYMATTR SpiceLine Td=2n Tau=10n SYMATTR Value2 Vhigh=5 Vlow=0 SYMATTR SpiceLine2 tripdt=5n SYMATTR InstName A2 SYMATTR Value Ref=1.5 SYMBOL digital\\schmtbuf 1616 -240 R0 WINDOW 3 20 96 Left 2 WINDOW 123 20 128 Left 2 WINDOW 39 20 161 Left 2 SYMATTR Value Vt=2.5 Vh=1 SYMATTR Value2 Vhigh=5 Vlow=0 SYMATTR SpiceLine Td=2n Trise=10n Tfall=10n SYMATTR InstName A3 SYMATTR SpiceLine2 tripdt=5n SYMBOL voltage 2528 1408 R0 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL res 2384 1424 R0 SYMATTR InstName R2 SYMATTR Value 250 SYMBOL digital\\and 1648 832 R0 WINDOW 39 16 176 Left 2 WINDOW 123 16 144 Left 2 SYMATTR SpiceLine Td=20n Rout=100 Cout=0.1n SYMATTR Value2 Vhigh=5 Vlow=0 SYMATTR SpiceLine2 tripdt=5n SYMATTR InstName A4 SYMATTR Value Ref=1.5 SYMBOL digital\\and 1648 208 R0 WINDOW 39 16 176 Left 2 WINDOW 123 16 140 Left 2 SYMATTR SpiceLine Td=2n Trise=10n Tfall=10n SYMATTR Value2 Vhigh=5 Vlow=0 SYMATTR InstName A5 SYMATTR Value Ref=1.5 SYMATTR SpiceLine2 tripdt=5n SYMBOL res 2000 1584 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R3 SYMATTR Value 20 SYMBOL diode 1984 1552 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value DLS SYMBOL diode 1920 1488 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D2 SYMATTR Value DLS SYMBOL res 2000 1488 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R4 SYMATTR Value 100 SYMBOL voltage 1968 1216 R0 SYMATTR InstName V3 SYMATTR Value 5 SYMBOL diode 1488 1408 R0 SYMATTR InstName D3 SYMATTR Value DLS SYMBOL Digital\\dflop 1600 1936 R0 WINDOW 3 186 86 Left 2 WINDOW 123 124 123 Left 2 WINDOW 39 122 155 Left 2 SYMATTR Value Ref=2.5 SYMATTR Value2 Vhigh=5 Vlow=0 SYMATTR SpiceLine Td=20n Trise=10n Tfall=10n SYMATTR InstName A6 SYMATTR SpiceLine2 tripdt=5n SYMBOL res 1488 1200 R0 SYMATTR InstName R5 SYMATTR Value 20k SYMBOL diode 1680 1344 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D4 SYMATTR Value DN SYMBOL diode 1776 1344 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D5 SYMATTR Value DN SYMBOL digital\\and 1648 -48 R0 WINDOW 123 16 140 Left 2 SYMATTR Value2 Vhigh=5 Vlow=0 SYMATTR InstName A7 SYMATTR Value Ref=1.5 Td=10n SYMATTR SpiceLine2 tripdt=5n SYMBOL voltage 1440 64 R0 SYMATTR InstName V4 SYMATTR Value 0.5 TEXT 984 344 Left 2 !.tran 0 1u 0 1n TEXT 1776 928 Left 2 ;TAU=Rout*Cout TEXT 1536 -248 Left 2 ;Threshhold 1.5V and 3.5V TEXT 1920 1712 Left 2 !.MODEL DLS D(Is=1e-9) TEXT 1520 1144 Left 2 ;SN74LS00, 74LS04, 74LS08, 74LS10, ... TEXT 1816 232 Left 2 ;Preferred definition\nTrise, Tfall TEXT 1904 -240 Left 2 ;The threshholds of the Schmitt-trigger gate is defined by \nVt for threshhold and Vh for hysteresis.\nVt1 = Vt+Vh\nVt2 = Vt-Vh TEXT 2352 1352 Left 2 ;External load TEXT 2200 -40 Left 2 ;Digital A Devices\n---------------------------\nHelmut Sennewald, 1/21/2008 V1.03\n \nDigital devices are part of the A-devices in LTSPICE.\n \nThree differnt ways are shown how to specify rise and fall times.\nI recommend to use the method Trise=.., Tfall=... .\n \nThe defaults are:\nOutput voltage Vhigh=1V Vlow=0V\nInput threshhold "Ref" : (Vhigh+Vlow)/2\nDelay time "Td" : Td = 0ns\nRise/fall time: Trise=0ns, Tfall = 0ns\n \nYou can overwrite individually any of these parameters.\nJust do a right-mouse-click on it to get the dialog window.\n \nLeave all unused inputs open! It's a mistake in LTSPICE \nto connect unused pins to 0 or Vcc.\n \nAll flipflops require some delay Td ! Dont 'use Td=0 for it.\n \nThe threshhold voltage for all digital devices is defined by "Ref".\nHint: The Schmitt-trigger gate is not a digital device.\nSchmitt-trigger gates use Vt and Vh instead of "Ref" \nfor threshhold definition.\nHere Vt1= Vt+Vh and Vt2=Vt-Vh\n \n74HC.. Ref=2.5 (@5V) VCC/2 \n74HCT.. Ref=1.5\n74LS.. Ref=1.1\n74AC.. Ref=2.5 (@5V) VCC/2\n74ACT.. Ref=1.5 TEXT 1544 1848 Left 2 ;Divider by 2 TEXT 1560 1448 Left 2 ;to other inputs TEXT 984 376 Left 2 ;.DC V1 0 5 0.01 TEXT 1520 1712 Left 2 !.MODEL DN D(Is=3e-16 Rs=10) TEXT 984 416 Left 2 !.options plotwinsize=0 TEXT 1024 -200 Left 2 ;Rev. 1.03 LINE Normal 1607 1376 1575 1376 LINE Normal 1591 1392 1607 1376 LINE Normal 1575 1376 1591 1392 LINE Normal 1575 1376 1575 1376 LINE Normal 1607 1392 1575 1392 LINE Normal 1590 1376 1590 1328 LINE Normal 1591 1424 1591 1392 LINE Normal 1655 1376 1623 1376 LINE Normal 1639 1392 1655 1376 LINE Normal 1623 1376 1639 1392 LINE Normal 1623 1376 1623 1376 LINE Normal 1655 1392 1623 1392 LINE Normal 1638 1376 1638 1328 LINE Normal 1639 1424 1639 1392 RECTANGLE Normal 2208 1792 1424 1104 2 CIRCLE Normal 2080 480 1440 112 2 CIRCLE Normal 1590 1328 1590 1328 CIRCLE Normal 1592 1326 1588 1330 CIRCLE Normal 1638 1328 1638 1328 CIRCLE Normal 1640 1326 1636 1330