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HEF4521B Datasheet 24-stage Frequency Divider And Oscillator

Manufacturer: NXP Semiconductors

Overview: INTEGRATED CIRCUITS DATA SHEET For a plete data sheet, please also download: • The IC04 LOCMOS HE4000B Logic Family Specifications HEF, HEC • The IC04 LOCMOS HE4000B Logic Package Outlines/Information HEF, HEC HEF4521B.

General Description

The HEF4521B consists of a chain of 24 toggle flip-flops with an overriding asynchronous master reset input (MR), and an input circuit that allows three modes of operation.

The single inverting stage (I2/O2) will function as a crystal oscillator, or in bination with I1 as an RC oscillator, or as an input buffer for an external oscillator.

Low-power HEF4521B MSI operation as a crystal oscillator is enabled by connecting external resistors to pins 3 (VSS’) and 5 (VDD’).

HEF4521B Distributor