MC14521B Datasheet PDF - ON Semiconductor

●24−Stage Frequency Divider

●The MC14521B consists of a chain of 24 flip−flops with an input circuit that allows three modes of operation. The input will function as a crystal oscillator, an RC oscillator, oras an input buffer for an external oscillator. Each flip−flop divides the frequency of the previous flip−flop by two, consequently this part will count up to 2 24 = 16,777,216. The count advances on the negative going edge of the clock. The outputs of the last seven−stages are available for added flexibility.

●Features

●•All Stages are Resettable

●•Reset Disables the RC Oscillator for Low Standby Power Drain

●•RC and Crystal Oscillator Outputs Are Capable of Driving External Loads

●•Test Mode to Reduce Test Time

●•VDD′and VSS′Pins Brought Out on Crystal Oscillator Inverter to Allow the Connection of External Resistors for Low−Power Operation

●•Supply Voltage Range = 3.0 Vdc to 18 Vdc

●•Capable of Driving Two Low−Power TTL Loads or One Low−Power Schottky TTL Load over the Rated Temperature Range

●•Pb−Free Packages are Available