GATE FAN IN AND FAN OUT NOT DETECTED IN MULTISIM PROGRAM

[ruhl]

GATE FAN IN AND FAN OUT NOT DETECTED IN MULTISIM PROGRAM..

TO MANY GATE INPUTS TIED TO ONE GATE OUTPUT ISN'T DETECTED..

GATE OUTPUT CAN ONLY HANDLE 16MA.

EACH GATE INPUT DRAWS 1.6MA.

NUMBER OF GATE INPUTS SHOULD ADD UP ABOUT 10MA.

THAT EQUALS ABOUT 5 TO 6 INPUTS PER OUTPUT.

RICHARD RUHL 

[Tien_P]

Hi Richard,

Do you have a circuit to illustrate what this?

[ruhl]

pattern16t file I gave you a month ago

richard

[ruhl]

pattern16t file I sent you a month or two ago

richard

[ruhl]

I changed the circuit  by adding additional gates to work with the real chips.

this is ware the problem would show up with burnt up chips.

attached is the corrections to keep this from happening.

[ruhl]

came upon another problem if there is a problem.  the displays on my circuit flash 6A twice then there is a gap befote the displays flach 6A twice again.

Is this gap the time the sinulation rngine of multisim takes to calculate the sinulation results.

if you put pattern16C under pattern16D you will see thee whole design and funtion of my circuit.

Do you think my circuit is worth anything and how much do you think my circuit would be worth.

richard ruhl

[ruhl]

do you have a bit map of a 40 pin scsi controller chip.  I need the data sheet to make a symbol in multisim program.

rich ruhl

[Tien_P]

I looked at you "Pattern16C" and "Pattern16" file but I don't know where the problem is, please provide more details.  I don't see component or net called "gate fan it" or "fan out", where should I look?

I don't have any information on a 40 pin SCSI controller, you should look for the datasheet from the manufacturer website.

[ruhl]

the voltage should drop on the output of the chip connected to to many inputs and should showw an error from the  the simulation engine of the software automatically   what it does is over load the circuit amp wise.

richard ruhl

[Tien_P]

Hi Richard,

The model for digital components in Multisim have behavioral model, that is, the input or output is either high or low. Regardless how many inputs or outputs you have, if the circuit logic is high you will read VCC and when the logic is low, you will read ground.