Version 4
SHEET 1 1556 704
WIRE -48 224 -48 192
WIRE -48 336 -48 304
WIRE -32 -128 -32 -160
WIRE -32 -16 -32 -48
WIRE 32 -160 -32 -160
WIRE 32 192 -48 192
WIRE 448 -128 448 -160
WIRE 448 -16 448 -48
WIRE 512 -160 448 -160
WIRE 544 128 512 128
WIRE 544 160 512 160
WIRE 544 192 512 192
WIRE 544 224 512 224
WIRE 544 352 512 352
WIRE 544 384 512 384
WIRE 544 416 512 416
WIRE 544 448 512 448
WIRE 672 -368 672 -384
WIRE 672 -272 672 -288
WIRE 800 256 768 256
WIRE 800 288 768 288
WIRE 800 352 768 352
WIRE 800 384 768 384
WIRE 800 416 768 416
WIRE 800 448 768 448
WIRE 832 -368 832 -384
WIRE 832 -272 832 -288
WIRE 976 -368 976 -384
WIRE 976 -272 976 -288
WIRE 976 -128 976 -160
WIRE 976 -16 976 -48
WIRE 1040 -160 976 -160
WIRE 1056 160 1008 160
WIRE 1056 256 1008 256
WIRE 1056 352 1008 352
WIRE 1056 448 1008 448
WIRE 1184 160 1136 160
WIRE 1184 256 1136 256
WIRE 1184 256 1184 160
WIRE 1184 352 1136 352
WIRE 1184 352 1184 256
WIRE 1184 448 1136 448
WIRE 1184 448 1184 352
WIRE 1248 160 1184 160
FLAG 832 -384 1
FLAG 832 -272 0
FLAG -48 336 0
FLAG 512 224 load
FLAG -32 -16 0
FLAG 512 160 D_U
FLAG 32 -160 D_U
FLAG 1248 160 sum
FLAG 800 352 q0
FLAG 800 384 q1
FLAG 800 416 q2
FLAG 800 448 q3
FLAG 800 256 maxmin
FLAG 800 288 rco
FLAG 1008 160 q0
FLAG 1008 256 q1
FLAG 1008 352 q2
FLAG 1008 448 q3
FLAG 512 448 1
FLAG 32 192 clock
FLAG 448 -16 0
FLAG 512 -160 load
FLAG 976 -16 0
FLAG 1040 -160 cten
FLAG 512 128 cten
FLAG 672 -272 0
FLAG 672 -384 VCC
FLAG 976 -272 0
FLAG 976 -384 O
FLAG 512 352 O
FLAG 512 384 O
FLAG 512 416 O
FLAG 512 192 clock
SYMBOL voltage -48 208 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(0 {VCC} 200n 1n 1n 100n 200n)
SYMBOL voltage 832 -384 R0
SYMATTR InstName V2
SYMATTR Value {VCC}
SYMBOL voltage -32 -144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE({VCC} 0 0 1n 1n 3100n 6200n)
SYMBOL res 1040 176 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R1
SYMATTR Value 40k
SYMBOL res 1040 272 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R2
SYMATTR Value 20k
SYMBOL res 1040 368 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL res 1040 464 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R4
SYMATTR Value 5k
SYMBOL voltage 448 -144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value PULSE({VCC} 0 7100n 1n 1n 600n 10000n)
SYMBOL voltage 976 -144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V5
SYMATTR Value PULSE(0 {VCC} 11300n 1n 1n 600n 20000n)
SYMBOL 74hc191 656 32 R0
SYMATTR InstName U1
SYMATTR SpiceLine VCC={VCC}  SPEED=1.0  TRIPDT=1e-9
SYMBOL voltage 672 -384 R0
SYMATTR InstName V6
SYMATTR Value {VCC}
SYMBOL voltage 976 -384 R0
SYMATTR InstName V7
SYMATTR Value 0
TEXT -40 -224 Left 0 !.tran 0 14u 0 1n
TEXT -40 -264 Left 0 !.include 74hc.lib
TEXT -40 -296 Left 0 !.param VCC 5
TEXT -32 -584 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.