Version 4
SHEET 1 1080 680
WIRE 560 -176 464 -176
WIRE 160 -160 -176 -160
WIRE 240 -160 160 -160
WIRE 400 -160 288 -160
WIRE -176 -128 -176 -160
WIRE 288 -128 288 -160
WIRE 560 -80 560 -176
WIRE 592 -80 560 -80
WIRE 592 -48 560 -48
WIRE 704 -48 656 -48
WIRE 1024 -48 752 -48
WIRE -176 -16 -176 -48
WIRE 288 -16 288 -48
WIRE 752 -16 752 -48
WIRE 560 48 560 -48
WIRE 560 48 464 48
WIRE 160 64 -176 64
WIRE 240 64 160 64
WIRE 400 64 288 64
WIRE -176 96 -176 64
WIRE 288 96 288 64
WIRE 752 96 752 64
WIRE -176 208 -176 176
WIRE 288 208 288 176
WIRE -176 352 -176 336
WIRE -176 448 -176 432
FLAG 288 208 0
FLAG 752 96 0
FLAG -176 448 0
FLAG -176 336 VCC
FLAG 288 -16 0
FLAG -176 208 0
FLAG -176 -16 0
FLAG 1024 -48 out
FLAG 160 -160 in1
FLAG 160 64 in2
FLAG 704 -48 o1
SYMBOL Digital\\schmitt 400 0 R0
WINDOW 3 -33 114 Left 2
WINDOW 123 -31 137 Left 2
SYMATTR Value VT=0.5 VH=0.1
SYMATTR InstName A1
SYMATTR Value2 TD=5n
SYMBOL voltage -176 336 R0
SYMATTR InstName VCC
SYMATTR Value {VCC}
SYMBOL Digital\\schmitt 400 -224 R0
WINDOW 3 -36 115 Left 2
WINDOW 123 -37 139 Left 2
SYMATTR Value VT=0.5 VH=0.1
SYMATTR InstName A2
SYMATTR Value2 TD=5n
SYMBOL voltage -176 80 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 -32 174 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 {VCC} 0 1u 1u 1u 4u)
SYMBOL Digital\\and 624 -128 R0
WINDOW 3 -32 115 Left 2
SYMATTR InstName A3
SYMATTR Value Td=5n
SYMBOL voltage -176 -144 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL bv 288 -144 R0
SYMATTR InstName B1
SYMATTR Value V=V(in1)/V(VCC)
SYMBOL bv 288 80 R0
SYMATTR InstName B2
SYMATTR Value V=V(in2)/V(VCC)
SYMBOL bv 752 -32 R0
SYMATTR InstName B3
SYMATTR Value V=V(o1)*V(VCC)
TEXT -176 -256 Left 2 !.tran 0 4u 0 5n
TEXT -184 -328 Left 2 !.step param VCC list 2.5 5
TEXT 352 -328 Left 4 ;2-input-schmitt-nand
LINE Normal 240 -80 240 -160 2
LINE Normal 256 -80 240 -80 2
LINE Normal 240 128 240 64 2
LINE Normal 256 128 240 128 2
LINE Normal 704 16 704 -48 2
LINE Normal 720 16 704 16 2
RECTANGLE Normal 992 256 208 -272 2