HEF4521BT - NXP

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

HEF4521BT
Manufacturer

NXP
ChipWorker Part#

CW151424755
Category

Counter, Counter IC
Package

SOIC
Description

NXP HEF4521BT Frequency Divider And Oscillator, 35MHz, 1 Gate, 1Input, 4.5V to 15.5V, SOIC-16
Documentation

Datasheet

HEF4521BT Global Supplier

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HEF4521BT Specifications

Attribute	Attribute Value

Part Number	HEF4521BT
Manufacturer	NXP
ChipWorker Part#	CW151424755
Category	Counter, Counter IC
Documentation	Datasheet
Mounting Style	Surface Mount
Number of Pins	16 Pin
Case/Package	SOIC
Supply Voltage (DC)	4.50V (min)
Number of Positions	16 Position
Clock Speed	35 MHz
Number of Gates	1 Gate
Operating Temperature (Max)	70 ℃
Operating Temperature (Min)	-40 ℃
Supply Voltage (Max)	15.5 V
Supply Voltage (Min)	4.5 V
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Size-Length	10 mm
Size-Width	4 mm
Size-Height	1.45 mm
Product Lifecycle Status	Unknown
Packaging	Each
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance	No SVHC
REACH SVHC Compliance Edition	2015/12/17

Product Description

The HEF4521BT is a 24-stage Frequency Divider and Oscillator consists of 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 VSS1 and VDD1 are supplied via external resistors. Each flip-flop divides the frequency of the previous flip-flop by two, consequently the HEF4521B counts up to 224 = 16777216. The counting advances on the high-to-low transition of the clock (A2). The outputs from each of the last seven stages (218 to 224) are available for additional flexibility. It operates over a recommended VDD power supply range of 3 to 15V referenced to VSS (usually ground). Unused inputs must be connected to VDD, VSS or another input.
Low power crystal oscillator operation
Fully static operation
Standardized symmetrical output characteristics
Complies with JEDEC standard JESD 13-B

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