Digital Circuit Diagrams+FETs+Drivers

[Earl]

74HC74
According to a Fairchild datasheet from 1983 at 5V the guaranteed speed is 30 MHz and typical clock speed is 72 MHz.  At 6V supply voltage the figures would be higher.

A Philips datasheet from 1994 says at 4.5V supply the guaranteed minimum is 30 MHz and typical is 69 MHz.
At 6V, guaranteed is 35 MHz and typical is 82 MHz.

Above is at 25 degrees C; higher temps give lower speeds and lower temps give higher speeds.

ATTENTION

The 74AC74 or 74ACT74 have Fairchild specs of
at 5V Vdd of guaranteed minimum clock of 140 MHz, typical 160 MHz.  At 6V, this would be a little faster.

These parts would give pulses of about 3 nsec width., maybe at 6V with very careful layout and by-passing it would be possible to achieve 2 nsec pulse width.

For testing of a 74AC74 circuit, you will need AS A MINIMUM:

An oscilloscope with 300 MHz analog bandwidth
A scope probe rated for 500 MHz bandwidth

Regards, Earl

What is the clock speed for the 10ns pulser?

[MeggerMan]

.

[turbo]

Hi All,

You will have difficulty building a faster or narrower pulser than this.

Are you sure ? 

[MeggerMan]

Earl,

OK it works now (wires were not joined), when I see it running I can see how simple it is, 3 chips (2 x dual D flip-flops,1 x 4 input NOR) and thats it!



I have attached the file if anyone wants to try it.
See
http://www.falstad.com/circuit/

Regards
Rob

[MACEDONIA CD]

HI


IS GOOD TO BE FAST BUT  WHIT SINUS FREKFENCY  NOT LIKE THAT                                                                                                                  .........................<<SINUS FREK.  >>IS FREKFENCY    PULSE IS NOT ...... THE PULSE   HAVE TO MANY  HARMONICIS  THE HARMONICS  NOT GIVE PROPERTLY MOVING  ELKTROMAGNET FILD.. IF  WE BE CREATED  SIMPLE  ELKTROMAGNET FILD AND MOVING PROPERLY  MAKEING  FAST TURNS <<THEN  YOU HAVE   LIKE  YOU HAVE  SMALL MAGNET  MAKEING   FAST TURNS  CLOUSE    HMMMMMM