器件名称:
MC14XXXBD
功能描述:
24-Stage Frequency Divider
文件大小:
263.27KB 共8页
简 介:
MOTOROLA SEMICONDUCTOR TECHNICAL DATA MC14520B See Page 6-292 MC14521B 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, or as 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 224 = 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. 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. MAXIMUM RATINGS* (Voltages Referenced to VSS) Symbol Parameter VDD Vin, Vout Iin, Iout PD Tstg TL DC Supply Voltage Value Unit V V L SUFFIX CERAMIC CASE 620 P SUFFIX PLASTIC CASE 648 D SUFFIX SOIC CASE 751B – 0.5 to + 18.0 ± 10 500 Input or Output Voltage (DC or Transient) – 0.5 to VDD + 0.5 Input or Output Current (DC or Transient), per Pin Power Dissipation, per Package Storag……
