Version 4
SHEET 1 1524 704
WIRE -48 192 -48 160
WIRE -48 304 -48 272
WIRE -48 384 -48 368
WIRE -48 480 -48 464
WIRE -32 -176 -32 -208
WIRE -32 -64 -32 -96
WIRE 16 160 -48 160
WIRE 32 -208 -32 -208
WIRE 96 384 96 368
WIRE 96 480 96 464
WIRE 368 352 336 352
WIRE 368 352 368 320
WIRE 368 384 368 352
WIRE 400 96 336 96
WIRE 400 128 336 128
WIRE 400 160 16 160
WIRE 400 192 368 192
WIRE 400 320 368 320
WIRE 400 352 368 352
WIRE 400 384 368 384
WIRE 400 416 336 416
WIRE 448 -176 448 -208
WIRE 448 -64 448 -96
WIRE 512 -208 448 -208
WIRE 656 224 624 224
WIRE 656 256 624 256
WIRE 656 320 624 320
WIRE 656 352 624 352
WIRE 656 384 624 384
WIRE 656 416 624 416
WIRE 912 128 864 128
WIRE 912 224 864 224
WIRE 912 320 864 320
WIRE 912 416 864 416
WIRE 944 -176 944 -208
WIRE 944 -64 944 -96
WIRE 1008 -208 944 -208
WIRE 1040 128 992 128
WIRE 1040 224 992 224
WIRE 1040 224 1040 128
WIRE 1040 320 992 320
WIRE 1040 320 1040 224
WIRE 1040 416 992 416
WIRE 1040 416 1040 320
WIRE 1104 128 1040 128
FLAG -48 368 1
FLAG -48 480 0
FLAG -48 304 0
FLAG 368 192 load
FLAG -32 -64 0
FLAG 336 128 D_U
FLAG 32 -208 D_U
FLAG 1104 128 sum
FLAG 656 320 q0
FLAG 656 352 q1
FLAG 656 384 q2
FLAG 656 416 q3
FLAG 656 224 maxmin
FLAG 656 256 rco
FLAG 864 128 q0
FLAG 864 224 q1
FLAG 864 320 q2
FLAG 864 416 q3
FLAG 336 416 1
FLAG 16 160 clock
FLAG 448 -64 0
FLAG 512 -208 load
FLAG 944 -64 0
FLAG 1008 -208 cten
FLAG 336 96 cten
FLAG 96 480 0
FLAG 96 368 O
FLAG 336 352 O
SYMBOL voltage -48 176 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(0 1 200n 1n 1n 100n 200n)
SYMBOL voltage -48 368 R0
SYMATTR InstName V2
SYMATTR Value 1
SYMBOL 74hc191h 512 0 R0
SYMATTR InstName X1
SYMBOL voltage -32 -192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(1 0 0 1n 1n 3100n 6200n)
SYMBOL res 896 144 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R1
SYMATTR Value 40k
SYMBOL res 896 240 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R2
SYMATTR Value 20k
SYMBOL res 896 336 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL res 896 432 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R4
SYMATTR Value 5k
SYMBOL voltage 448 -192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value PULSE(1 0 7100n 1n 1n 600n 10000n)
SYMBOL voltage 944 -192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V5
SYMATTR Value PULSE(0 1 11300n 1n 1n 600n 20000n)
SYMBOL voltage 96 368 R0
SYMATTR InstName V6
SYMATTR Value 0
TEXT -48 -336 Left 0 !.tran 0 14u 0 1n
TEXT -40 -600 Left 0 ;Take care that none of the contol signals change\nits level at the positive edge of the clock signal.\n \nNever use GND(0) as an input of a digital device,\nbecause this input would be then ignored like an \nunconnected pin. There is an info in the help-file \nof LTspice about this behavior in the chapter\nLTspice -> Circuit Elements -> A Special Functions\nI named the net with the letter O for a logical 0.