Version 4
SHEET 1 1052 828
WIRE 48 -160 32 -160
WIRE 128 -160 112 -160
WIRE 288 -160 272 -160
WIRE 32 -144 32 -160
WIRE 112 -144 112 -160
WIRE 272 -144 272 -160
WIRE 80 32 32 32
WIRE 128 32 80 32
WIRE 256 32 208 32
WIRE 272 32 256 32
WIRE 32 48 32 32
WIRE 400 48 384 48
WIRE 432 48 400 48
WIRE 128 64 96 64
WIRE 272 64 256 64
WIRE 256 112 256 64
WIRE 400 112 400 48
WIRE 256 144 400 112
WIRE 400 144 256 112
WIRE 256 192 256 144
WIRE 272 192 256 192
WIRE 400 208 400 144
WIRE 400 208 384 208
WIRE 96 224 96 64
WIRE 96 224 64 224
WIRE 128 224 96 224
WIRE 256 224 208 224
WIRE 272 224 256 224
WIRE 80 256 32 256
WIRE 128 256 80 256
WIRE 32 272 32 256
FLAG 160 288 0
FLAG 176 288 0
FLAG 144 288 0
FLAG 80 256 ref_top
FLAG 160 192 vcc
FLAG 160 96 0
FLAG 176 96 0
FLAG 144 96 0
FLAG 80 32 ref_bot
FLAG 160 0 vcc
FLAG 64 224 sig_in
FLAG 32 -64 0
FLAG 48 -160 vcc
FLAG 112 -64 0
FLAG 288 -160 sig_in
FLAG 256 224 _reset
FLAG 256 32 _set
FLAG 32 352 0
FLAG 432 48 out
FLAG 272 -64 0
FLAG 128 -160 test
FLAG 32 128 0
SYMBOL Comparators\\LT1714 160 240 R0
SYMATTR InstName U1_B
SYMBOL Comparators\\LT1714 160 48 R0
SYMATTR InstName U1_A
SYMBOL voltage 32 -160 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 32 Left 2
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage 112 -160 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 -14 117 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 4 0 5u 5u 0 10u)
SYMBOL voltage 32 256 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 -20 121 Left 2
SYMATTR InstName V3
SYMATTR Value {vtop}
SYMBOL bv 272 -160 R0
SYMATTR InstName B1
SYMATTR Value V=idt(if(V(out)>2.5,1,-1))*16k
SYMBOL 74hc00 320 -16 R0
SYMATTR InstName U2_A
SYMBOL 74hc00 320 144 R0
SYMATTR InstName U2_B
SYMBOL voltage 32 32 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 -31 121 Left 2
SYMATTR InstName V4
SYMATTR Value {vtop*0.9}
TEXT 8 -184 Left 2 !.tran 0 340u 200u
TEXT 8 -240 Left 2 !.lib 74Hc_Don.lib
TEXT 8 -200 Left 2 !.opt plotwinsize 0
TEXT 8 -272 Left 2 ;.ferret http://ltwiki.org/files/LTspiceIV/lib/sym/Dig_Add/74HC/74hc00.asy
TEXT 8 -256 Left 2 ;.lib http://ltwiki.org/files/LTspiceIV/lib/sub/74Hc_Don.lib
TEXT 128 320 Left 2 !.param vtop=4
TEXT 128 336 Left 2 !.step param vtop list 0.4 4