HEF4521BT Series

24-stage frequency divider and oscillator

Catalog

24-stage frequency divider and oscillator

Part	Number of Elements	Mounting Type	Number of Bits per Element	Operating Temperature [Max]	Operating Temperature [Min]	Logic Type	Package / Case	Package / Case	Voltage - Supply [Min]	Voltage - Supply [Max]	Reset	Supplier Device Package	Count Rate	Trigger Type
Nexperia USA Inc. HEF4521BT,653	1	Surface Mount	24	85 °C	-40 C	Divide-by-2	16-SOIC	0.154 in 3.9 mm	3 V	15 V	Asynchronous	16-SO	35 MHz	Negative Edge

Catalog

24-stage frequency divider and oscillator

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 (A2 to Y2) functions as: a crystal oscillator, an input buffer for an external oscillator or in combination with A1 as an RC oscillator. The crystal oscillator operates in Low-power mode when pins VSS1and VDD1are supplied via external resistors.