how to generate a clock of 640khz using 74ls74 | Microcontroller › 8051 › how to generate a clock of 640khz using 74ls74 This topic has 1 reply, 2 voices, and was last updated 12 years, 7 months ago by Anonymous. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts October 24, 2010 at 2:28 pm #457 shilpi nemaParticipant hi!!! i want to generate a clock of freq 640khz using 74ls74 for adc0808 i have done the required connections correctly but the clock is still nt coming plz rply if ne1 can help me to fix dis thanx November 7, 2010 at 9:04 am #5142 AnonymousGuest use the cirucuit given on this website. Check connection properly. Use a CRO to check output clock… Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In