Version 4
SHEET 1 880 680
WIRE 512 -32 512 -48
WIRE -16 0 -208 0
WIRE 144 0 64 0
WIRE 304 0 144 0
WIRE 416 0 368 0
WIRE 512 80 512 48
WIRE 144 144 144 0
WIRE -96 160 -96 128
WIRE -208 256 -208 0
WIRE -176 256 -208 256
WIRE -96 256 -96 224
WIRE -96 256 -176 256
WIRE -32 256 -96 256
WIRE 144 256 144 224
WIRE 144 256 80 256
WIRE 240 256 144 256
WIRE 416 256 416 0
WIRE 416 256 352 256
WIRE 512 256 416 256
WIRE -96 288 -96 256
WIRE -96 384 -96 352
FLAG 512 256 out
IOPIN 512 256 Out
FLAG 512 80 0
FLAG 512 -48 vcc
FLAG -96 384 0
FLAG -96 128 vcc
FLAG -176 256 1
SYMBOL 74hc04 16 192 R0
SYMATTR InstName U1
SYMBOL 74hc04 288 192 R0
SYMATTR InstName U3
SYMBOL res 80 -16 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 128 128 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL cap 368 -16 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL voltage 512 -48 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL diode -112 224 M180
WINDOW 0 24 72 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL diode -112 352 M180
WINDOW 0 24 72 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D2
SYMATTR Value 1N914
TEXT -200 -136 Left 0 !.tran 0 100u 0 10n
TEXT -200 -168 Left 0 !.include 74hc.lib
TEXT -200 -104 Left 0 !.options plotwinsize=0
TEXT -152 456 Left 0 ;Input protection diodes added to model
TEXT -200 -64 Left 0 !.ic V(1)=0
RECTANGLE Normal 80 416 -144 64