* SPICE netlist
I1 Vcc COM TBL(0 0 1 .2m)
D1 COM Vcc 34V
A1 Vcc COM COM COM COM COM N004 COM SCHMITT Vt=8.2 Vh=0.3 Vhigh=2.5 Rout=1k
R1 Vcc N004 8e6
C1 N004 COM 1p
S1 N003 Vcc N004 2v5 ref
D2 N003 Vcc V65
C2 2v5 COM 1p Rpar=240
R2 2v5 N003 240
R3 Ref N003 280m
C3 COM Ref 10p
C4 Osc COM 5p
A2 Osc COM COM COM COM COM N005 COM ExtOsc Vtcap=1.75 Vhcap=.85 Icharge=1p Idischarge=8.3m duty=.96 tripdt=5n nobreak
C5 Vfb COM 1p
R4 N007 Vfb 165k
C6 Err N007 1p Rpar=10G
A4 N007 2v5 COM COM COM COM Err COM OTA Vhigh=6 Vlow=0.7 Isrc=1m Isink=-6m Rclamp=1 g=5 Rout=25k Cout=5p eaclk=A2 powerup=!V(fault,Com)
C7 Ifb COM 5p
R5 N010 Ifb 75k
C8 N010 COM 1p
D3 Err N008 2R
D4 N008 COM 1R
C9 N008 COM 1p Rpar=1e6
A6 Ref COM COM COM COM fault COM COM SCHMITT Vt=4.8 Vh=.1 trise=200n
S2 Out Vcc T1 fault Ho
S3 Com Out fault T1 Lo
C10 Vcc COM 20p
C11 Out Com 20p
A5 N008 N010 COM COM COM COM N009 COM SCHMITT Vt=0.1 Vh=0.1
A7 N009 COM N006 COM N011 COM T1 COM DFLOP trise=200n tripdt=5n
A8 N006 COM COM COM N009 N011 COM COM AND
A3 N005 COM COM COM COM COM N006 COM Counter cycles=2

* LTspice schematic (.asc)
Version 4
SHEET 1 1648 1472
WIRE -824 -704 -824 -736
WIRE -824 736 -824 704
WIRE -792 -736 -824 -736
WIRE -792 736 -824 736
WIRE -664 -416 -712 -416
WIRE -664 -384 -664 -416
WIRE -664 -272 -664 -304
WIRE -664 -208 -712 -208
WIRE -664 -192 -664 -208
WIRE -664 -96 -664 -128
WIRE -664 32 -712 32
WIRE -664 64 -664 32
WIRE -664 160 -664 128
WIRE -664 368 -728 368
WIRE -664 416 -664 368
WIRE -664 512 -664 480
WIRE -616 32 -664 32
WIRE -616 368 -664 368
WIRE -600 -208 -664 -208
WIRE -600 -160 -600 -192
WIRE -568 -416 -664 -416
WIRE -568 -384 -568 -416
WIRE -568 -272 -568 -320
WIRE -488 368 -536 368
WIRE -488 416 -488 368
WIRE -488 512 -488 480
WIRE -472 -416 -568 -416
WIRE -472 -336 -472 -416
WIRE -472 32 -536 32
WIRE -472 80 -472 32
WIRE -456 -208 -536 -208
WIRE -456 -160 -456 -192
WIRE -440 -336 -472 -336
WIRE -440 -288 -440 -320
WIRE -440 32 -472 32
WIRE -440 80 -472 80
WIRE -440 96 -488 96
WIRE -424 176 -424 144
WIRE -344 -336 -376 -336
WIRE -344 -288 -344 -336
WIRE -344 -48 -712 -48
WIRE -344 32 -376 32
WIRE -344 32 -344 -48
WIRE -344 96 -376 96
WIRE -344 96 -344 32
WIRE -344 256 -344 96
WIRE -344 336 -344 320
WIRE -344 384 -344 336
WIRE -344 480 -344 448
WIRE -280 -208 -392 -208
WIRE -280 160 -280 -208
WIRE -280 336 -344 336
WIRE -280 384 -280 336
WIRE -280 480 -280 448
WIRE -168 336 -280 336
WIRE -168 368 -488 368
WIRE -168 416 -168 384
WIRE -72 352 -104 352
WIRE -72 576 -72 352
WIRE -24 160 -280 160
WIRE -24 400 -24 160
WIRE -24 512 -24 400
WIRE -8 512 -24 512
WIRE -8 576 -72 576
WIRE 8 608 8 576
WIRE 24 352 -72 352
WIRE 24 400 -24 400
WIRE 24 480 24 448
WIRE 104 560 56 560
WIRE 104 560 104 448
WIRE 184 -416 -472 -416
WIRE 184 -400 184 -416
WIRE 184 -288 -344 -288
WIRE 184 -288 184 -320
WIRE 248 352 184 352
WIRE 248 352 248 320
WIRE 264 -416 184 -416
WIRE 264 -336 264 -416
WIRE 264 -288 184 -288
WIRE 264 -272 264 -288
WIRE 264 -176 264 -208
WIRE 264 176 232 176
WIRE 264 224 264 192
WIRE 296 -416 264 -416
WIRE 296 -336 264 -336
WIRE 312 -288 264 -288
WIRE 344 320 248 320
WIRE 408 -416 360 -416
WIRE 408 -336 376 -336
WIRE 408 -336 408 -416
WIRE 408 -288 360 -288
WIRE 408 -272 408 -288
WIRE 408 -176 408 -208
WIRE 440 320 344 320
WIRE 440 320 440 128
WIRE 472 176 328 176
WIRE 472 272 408 272
WIRE 472 272 472 176
WIRE 488 -416 408 -416
WIRE 488 -400 488 -416
WIRE 488 -288 408 -288
WIRE 488 -288 488 -320
WIRE 488 128 440 128
WIRE 488 176 472 176
WIRE 488 272 472 272
WIRE 488 320 440 320
WIRE 520 -416 488 -416
WIRE 520 -288 488 -288
WIRE 536 112 536 80
WIRE 536 224 536 192
WIRE 536 256 536 224
WIRE 536 368 536 336
WIRE 536 400 536 368
WIRE 632 -416 600 -416
WIRE 632 -400 632 -416
WIRE 632 -304 632 -336
WIRE 632 80 536 80
WIRE 632 112 632 80
WIRE 632 208 632 176
WIRE 632 224 536 224
WIRE 632 256 632 224
WIRE 632 368 536 368
WIRE 632 368 632 320
WIRE 680 80 632 80
WIRE 680 368 632 368
WIRE 696 -416 632 -416
WIRE 696 224 632 224
WIRE 824 -736 792 -736
WIRE 824 -704 824 -736
WIRE 824 736 792 736
WIRE 824 736 824 704
FLAG 696 224 Out
IOPIN 1056 384 In
FLAG 632 -304 COM
FLAG 696 -416 Ref
IOPIN 1056 -256 In
FLAG -712 -208 Osc
IOPIN -352 -48 In
FLAG -488 512 COM
FLAG -712 32 Vfb
IOPIN -352 192 In
FLAG -712 -48 Err
IOPIN -352 112 In
FLAG -344 480 COM
FLAG -728 368 Ifb
IOPIN -368 528 In
FLAG -664 512 COM
FLAG -664 160 COM
FLAG -664 -96 COM
FLAG -488 96 2v5
FLAG -712 -416 Vcc
IOPIN -352 -256 In
FLAG 408 -176 COM
FLAG 680 80 Vcc
IOPIN 1040 240 In
FLAG 680 368 Com
IOPIN 1040 528 In
FLAG 632 208 COM
FLAG 520 -288 2v5
FLAG 232 176 Ref
FLAG -280 480 COM
FLAG -568 -272 COM
FLAG 264 -176 COM
FLAG 408 272 fault
FLAG -664 -272 COM
FLAG 264 224 COM
FLAG -424 176 COM
FLAG 8 608 COM
FLAG -600 -160 COM
FLAG -440 -288 COM
FLAG 536 400 COM
FLAG -168 416 COM
FLAG 24 480 COM
FLAG 344 320 T1
IOPIN 704 480 Out
FLAG -456 -160 COM
SYMBOL current -664 -384 R0
SYMATTR Value TBL(0 0 1 .2m)
SYMATTR InstName I1
SYMBOL zener -584 -320 M180
SYMATTR InstName D1
SYMATTR Value 34V
SYMBOL Digital\\schmtbuf -440 -400 R0
SYMATTR InstName A1
SYMATTR Value Vt=8.2 Vh=0.3
SYMATTR Value2 Vhigh=2.5 Rout=1k
SYMBOL res 168 -416 R0
SYMATTR InstName R1
SYMATTR Value 8e6
SYMBOL cap 248 -272 R0
SYMATTR InstName C1
SYMATTR Value 1p
SYMBOL sw 392 -336 M270
SYMATTR InstName S1
SYMATTR Value ref
SYMBOL diode 360 -432 R90
SYMATTR InstName D2
SYMATTR Value V65
SYMBOL cap 424 -272 M0
SYMATTR Value 1p
SYMATTR SpiceLine Rpar=240
SYMATTR InstName C2
SYMBOL res 504 -304 R180
SYMATTR InstName R2
SYMATTR Value 240
SYMBOL res 616 -432 R90
SYMATTR InstName R3
SYMATTR Value 280m
SYMBOL cap 616 -336 M180
SYMATTR InstName C3
SYMATTR Value 10p
SYMBOL cap -648 -192 M0
SYMATTR Value 5p
SYMATTR InstName C4
SYMBOL Digital\\buf1 -600 -272 R0
SYMATTR Value Vtcap=1.75 Vhcap=.85
SYMATTR InstName ExtOsc
SYMATTR InstName A2
SYMATTR Value2 Icharge=1p Idischarge=8.3m
SYMATTR SpiceLine duty=.96 tripdt=5n nobreak
SYMBOL cap -648 64 M0
SYMATTR InstName C5
SYMATTR Value 1p
SYMBOL res -520 16 R90
SYMATTR InstName R4
SYMATTR Value 165k
SYMBOL cap -376 16 R90
SYMATTR InstName C6
SYMATTR Value 1p
SYMATTR SpiceLine Rpar=10G
SYMBOL Digital\\or -408 48 R0
SYMATTR InstName A4
SYMATTR InstName OTA
SYMATTR Value Vhigh=6 Vlow=0.7 Isrc=1m Isink=-6m
SYMATTR Value2 Rclamp=1 g=5 Rout=25k Cout=5p
SYMATTR SpiceLine eaclk=A2 powerup=!V(fault,Com)
SYMBOL cap -648 416 M0
SYMATTR InstName C7
SYMATTR Value 5p
SYMBOL res -520 352 R90
SYMATTR InstName R5
SYMATTR Value 75k
SYMBOL cap -504 416 R0
SYMATTR InstName C8
SYMATTR Value 1p
SYMBOL diode -328 256 M0
SYMATTR Value 2R
SYMATTR InstName D3
SYMBOL diode -328 384 M0
SYMATTR Value 1R
SYMATTR InstName D4
SYMBOL cap -296 384 R0
SYMATTR InstName C9
SYMATTR Value 1p
SYMATTR SpiceLine Rpar=1e6
SYMBOL Digital\\schmtinv 264 112 R0
SYMATTR InstName A6
SYMATTR Value Vt=4.8 Vh=.1
SYMATTR Value2 trise=200n
SYMBOL sw 536 208 M180
SYMATTR InstName S2
SYMATTR Value Ho
SYMBOL sw 536 352 M180
SYMATTR InstName S3
SYMATTR Value Lo
SYMBOL cap 616 112 R0
SYMATTR Value 20p
SYMATTR InstName C10
SYMBOL cap 616 256 R0
SYMATTR InstName C11
SYMATTR Value 20p
SYMBOL Digital\\diffschmtbuf -168 288 R0
SYMATTR Value Vt=0.1 Vh=0.1
SYMATTR InstName A5
SYMBOL Digital\\dflop 104 304 R0
SYMATTR Value trise=200n tripdt=5n
SYMATTR InstName A7
SYMBOL Digital\\and 24 480 R0
SYMATTR InstName A8
SYMBOL Digital\\buf1 -456 -272 R0
SYMATTR InstName Counter
SYMATTR InstName A3
SYMATTR Value cycles=2