DESCRIPTION - The SN54LS/74LS124 features two independent voltage-controlled oscillators (VCO) in a single

package. The frequency of each VCO is established by

an external component, either a capacitor or a crystal, in

combination with two voltage-sensitive inputs, one for

frequency range and one for frequency control. These

highly stable oscillators can be set to operate at any frequency typically between 0.12 Hz and 30 MHz. The

output frequency can be approximated as follows: