Re: Do I need some sort of delay between two latch circuits?

On Sun, 22 Jul 2007 13:08:53 -0500, John Fields
<jfields@xxxxxxxxxxxxxxxxxxxxx> wrote:

On Sun, 22 Jul 2007 15:12:01 -0000, laylow <laylow@xxxxxxxxxxxxxx>

Here's the LTSPICE circuit list for something that'll do what you
want over the range of speeds you list:

---
Oops...

Don't let those CMOS inputs float when the diodes cut off!

Version 4
*** 1 2244 800
WIRE 352 -272 128 -272
WIRE 1104 -272 880 -272
WIRE 352 -224 352 -272
WIRE 1104 -224 1104 -272
WIRE 800 -208 480 -208
WIRE 976 -208 800 -208
WIRE 272 -176 -96 -176
WIRE 592 -176 432 -176
WIRE 976 -176 976 -208
WIRE 1024 -176 976 -176
WIRE 1248 -176 1184 -176
WIRE 272 -128 48 -128
WIRE 480 -128 480 -208
WIRE 480 -128 448 -128
WIRE 592 -128 592 -176
WIRE 800 -128 800 -208
WIRE 1024 -128 976 -128
WIRE 1248 -48 1248 -176
WIRE 240 -16 208 -16
WIRE 336 -16 304 -16
WIRE 352 -16 352 -80
WIRE 352 -16 336 -16
WIRE 384 -16 352 -16
WIRE 592 -16 592 -48
WIRE 592 -16 448 -16
WIRE 208 32 208 -16
WIRE 1104 32 1104 -80
WIRE 1104 32 208 32
WIRE 592 64 592 -16
WIRE 688 64 592 64
WIRE -96 80 -96 -176
WIRE 48 80 48 -128
WIRE 208 80 208 32
WIRE 336 80 336 -16
WIRE 480 80 480 -128
WIRE 688 80 688 64
WIRE 976 80 976 -128
WIRE 592 96 592 64
WIRE 800 128 800 -48
WIRE 800 128 752 128
WIRE -96 208 -96 160
WIRE 48 208 48 160
WIRE 48 208 -96 208
WIRE 128 208 128 -272
WIRE 128 208 48 208
WIRE 208 208 208 160
WIRE 208 208 128 208
WIRE 336 208 336 160
WIRE 336 208 208 208
WIRE 480 208 480 160
WIRE 480 208 336 208
WIRE 592 208 592 160
WIRE 592 208 480 208
WIRE 688 208 688 176
WIRE 688 208 592 208
WIRE 880 208 880 -272
WIRE 880 208 688 208
WIRE 976 208 976 160
WIRE 976 208 880 208
WIRE 1248 208 1248 32
WIRE 1248 208 976 208
WIRE -96 288 -96 208
FLAG -96 288 0
SYMBOL voltage 48 64 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0 5 1 1E-6 1e-6 .1 2)
SYMATTR InstName V2
SYMBOL voltage -96 64 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value 5
SYMATTR InstName V1
SYMBOL res 576 -144 R0
WINDOW 0 -37 37 Left 0
WINDOW 3 -47 72 Left 0
SYMATTR InstName R1
SYMATTR Value 1e6
SYMBOL cap 576 96 R0
WINDOW 0 -37 33 Left 0
WINDOW 3 -48 63 Left 0
SYMATTR InstName C1
SYMATTR Value 1e-6
SYMBOL Digital\\dflop 352 -224 R0
WINDOW 0 28 -55 Left 0
SYMATTR InstName A1
SYMATTR SpiceLine trise 1e-6 tfall 1e-6 vhigh 5v
SYMBOL res 464 64 R0
WINDOW 0 -32 35 Left 0
WINDOW 3 -42 68 Left 0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL Digital\\dflop 1104 -224 R0
WINDOW 0 30 -58 Left 0
SYMATTR InstName A2
SYMATTR SpiceLine trise 1e-6 tfall 1e-6 vhigh 5v
SYMBOL diode 448 -32 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL diode 240 0 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL voltage 208 64 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0 5 0 1E-6 1e-6 .1)
SYMATTR InstName V3
SYMBOL voltage 976 64 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0 5 2 1E-6 1e-6 .1 2)
SYMATTR InstName V4
SYMBOL res 1232 -64 R0
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL npn 752 80 M0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL res 784 -144 R0
WINDOW 0 -41 45 Left 0
WINDOW 3 -50 74 Left 0
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL res 320 64 R0
WINDOW 0 41 39 Left 0
WINDOW 3 34 73 Left 0
SYMATTR InstName R5
SYMATTR Value 10e6
TEXT -72 232 Left 0 !.tran 5
TEXT -80 264 Left 0 !.option noopiter
TEXT 216 168 Left 0 ;RESET
TEXT 64 168 Left 0 ;FWD
TEXT 984 168 Left 0 ;REV
TEXT 360 -248 Left 0 ;HC4013
TEXT 1112 -248 Left 0 ;HC4013



--
JF
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