you can provide the clock from controller itself.. for external clock try using two 7474 in series as has been given here..
chck this : http://www.engineersgarage.com/microcontroller/8051projects/interface-ADC0808-AT89C51-D-flip-flop-clock
you can provide the clock from controller itself.. for external clock try using two 7474 in series as has been given here..
chck this : http://www.engineersgarage.com/microcontroller/8051projects/interface-ADC0808-AT89C51-D-flip-flop-clock