MC14521B集成电路（IC）的计数器除法器规格书PDF中文资料

MC14521B属于集成电路（IC）的计数器除法器。由安森美半导体公司制造生产的MC14521B计数器，除法器计数器和除法器 IC 是数字逻辑器件，可对输入发生的逻辑转换进行计数，然后使用多个并行输出重新发送累加的计数，和/或生成单个输出信号转换，从而对应用某些整数数量输入信号转换进行响应。除了简单的事件计数，它们还可用于各种频率合成应用。

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*