Version 4
SHEET 1 1236 800
WIRE 144 64 128 64
WIRE 240 64 208 64
WIRE 144 160 128 160
WIRE 240 160 240 64
WIRE 240 160 224 160
WIRE 320 160 240 160
WIRE 432 160 400 160
WIRE 304 240 304 224
WIRE 320 240 304 240
WIRE 48 256 48 240
WIRE 304 256 304 240
WIRE 320 256 320 240
WIRE 240 272 240 160
WIRE 272 272 240 272
WIRE 432 288 432 160
WIRE 432 288 336 288
WIRE 448 288 432 288
WIRE 272 304 240 304
WIRE 160 320 160 304
WIRE 288 336 288 320
WIRE 304 336 304 320
WIRE 304 336 288 336
WIRE 320 336 320 320
WIRE 320 336 304 336
WIRE 48 352 48 336
WIRE 304 352 304 336
WIRE 160 416 160 400
WIRE 240 416 240 304
WIRE 240 416 160 416
WIRE 256 416 240 416
WIRE 432 416 432 288
WIRE 432 416 400 416
WIRE 160 432 160 416
WIRE 160 528 160 512
FLAG 48 352 0
FLAG 48 240 +V
FLAG 304 224 +V
FLAG 160 304 +V
FLAG 160 528 0
FLAG 128 64 0
FLAG 304 352 0
FLAG 128 160 0
FLAG 448 288 OUT
SYMBOL voltage 48 240 R0
SYMATTR InstName V1
SYMATTR Value 3.3
SYMBOL misc\\xtal 320 400 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1.6p
SYMATTR SpiceLine Rser=45 Lser=15.6m Cpar=6p
SYMBOL res 144 416 R0
SYMATTR InstName R1
SYMATTR Value 620
SYMBOL res 144 304 R0
SYMATTR InstName R2
SYMATTR Value 2K
SYMBOL res 416 144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 2K
SYMBOL cap 208 48 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value .1µ
SYMBOL res 416 400 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 220
SYMBOL Comparators\\LT1719 304 224 R0
SYMATTR InstName U1
SYMBOL res 240 144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 1.8K
TEXT 336 488 Left 2 !.tran 250u startup
TEXT 392 16 Bottom 2 ;2.7 to 6V Crystal Oscillator with TTL/CMOS Output