Version 4
SHEET 1 880 680
WIRE -768 -96 -832 -96
WIRE -736 -96 -768 -96
WIRE -624 -96 -656 -96
WIRE -576 -96 -624 -96
WIRE -624 -32 -688 -32
WIRE -576 -32 -576 -48
WIRE -576 -32 -624 -32
WIRE -128 -32 -192 -32
WIRE -96 -32 -128 -32
WIRE 16 -32 -16 -32
WIRE 64 -32 16 -32
WIRE -832 -16 -832 -96
WIRE -688 -16 -688 -32
WIRE -288 0 -352 0
WIRE -576 16 -720 16
WIRE -720 32 -720 16
WIRE 16 32 -48 32
WIRE 64 32 64 16
WIRE 64 32 16 32
WIRE -576 48 -592 48
WIRE -48 48 -48 32
WIRE -336 64 -352 64
WIRE 352 64 288 64
WIRE 64 80 64 32
WIRE -832 96 -832 48
WIRE 64 112 -16 112
WIRE -592 128 -592 48
WIRE -576 128 -592 128
WIRE -16 128 -16 112
WIRE 304 128 288 128
WIRE -352 176 -352 160
WIRE -16 208 -16 192
WIRE 288 240 288 224
WIRE -768 256 -768 -96
WIRE -592 256 -592 128
WIRE -592 256 -768 256
WIRE -544 256 -592 256
WIRE -352 272 -352 256
WIRE -352 272 -384 272
WIRE -544 288 -576 288
WIRE -128 320 -128 -32
WIRE 64 320 64 192
WIRE 64 320 -128 320
WIRE 96 320 64 320
WIRE -576 336 -576 288
WIRE -288 336 -288 0
WIRE -288 336 -576 336
WIRE 288 336 288 320
WIRE 288 336 256 336
WIRE 96 352 64 352
WIRE 64 400 64 352
WIRE 352 400 352 64
WIRE 352 400 64 400
FLAG -688 -16 0
FLAG -832 96 0
FLAG -720 96 0
FLAG -352 160 VCC
FLAG -48 48 0
FLAG -16 208 0
FLAG 288 224 VCC
FLAG -192 -32 VCC
FLAG -832 -96 VCC
SYMBOL res -640 -112 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 100k
SYMBOL cap -640 -96 R0
SYMATTR InstName C2
SYMATTR Value 1n
SYMBOL Misc\\cell -832 -16 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 -29 -16 Left 0
WINDOW 3 -22 67 Left 0
SYMATTR InstName V3
SYMATTR Value 5
SYMBOL Misc\\cell -720 32 R0
WINDOW 0 -38 -15 Left 0
WINDOW 3 -64 -73 VRight 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value PULSE(0 5 0 0 0 1u 50u)
SYMBOL 74hc125 -464 208 R0
SYMATTR InstName U4
SYMBOL res -368 160 R0
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL 74hc123 -464 -160 R0
WINDOW 0 39 319 Left 0
SYMATTR InstName U1
SYMBOL res 0 -48 R90
WINDOW 0 42 96 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL cap 0 -32 R0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL Misc\\cell -16 128 R0
WINDOW 3 -143 -138 VRight 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0 5 0 10n 10n 25u 50u)
SYMATTR InstName V2
SYMBOL 74hc125 176 272 R0
SYMATTR InstName U2
SYMBOL res 272 224 R0
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL 74hc123 176 -96 R0
WINDOW 0 39 319 Left 0
SYMATTR InstName U3
TEXT -104 384 Left 0 !.tran 20
TEXT -752 224 Left 0 !.lib 74hc.lib
TEXT -80 288 Left 0 !.lib 74hc.lib
TEXT -712 8 Left 0 ;Should be\nLeading Edge !!
TEXT -96 72 Left 0 ;Should be\nTrailing Edge !!
TEXT -984 288 Left 0 ;Leading Edge Retrigerable Pins 3,\n5 to VDD, Pulse input on pin 4
TEXT -368 -112 Left 0 ;Trailing Edge Retrigerable\nPins 3 to VDD, pin 4 to Vss;\n Pulse input on pin 5