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.

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
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
24-Stage Frequency DividerMC14521B/D (123kB)10Jul, 2014
Package Drawings (1)
Document TitleDocument ID/SizeRevision
SOIC 16 LEAD751B-05 (38.2kB)K
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
MC14521BDGActivePb-free Halide freeSOIC-16751B-051Tube48$0.4
MC14521BDR2GActivePb-free Halide freeSOIC-16751B-051Tape and Reel2500$0.4
NLV14521BDGActiveAEC Qualified PPAP Capable Pb-free Halide freeSOIC-16751B-051Tube48$0.44
NLV14521BDR2GActiveAEC Qualified PPAP Capable Pb-free Halide freeSOIC-16751B-051Tape and Reel2500$0.44
Specifications
ProductTypeVCC Min (V)VCC Max (V)tpd Max (ns)PD Max (W)IO Max (mA)
MC14521BDGDivider31845000.52.25
MC14521BDR2GDivider31845000.52.25
NLV14521BDGDivider31845000.52.25
NLV14521BDR2GDivider31845000.52.25
24-Stage Frequency Divider (123kB) MC14521B
SOIC 16 LEAD MC14504B