Datasheet > 840N021

840N021

更新时间： 2024-11-03 01:10:51

品牌	Logo	应用领域
艾迪悌 - IDT		/
页数	文件大小	规格书
13页	268K
描述
FemtoClock NG Crystal-to-LVCMOS/LVTTL Clock

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中文翻译

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数据手册

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840N021 数据手册

FemtoClock® NG

Crystal-to-LVCMOS/LVTTL Clock

840N021

DATA SHEET

General Description

Features

The 840N021 is a LVCMOS/LVTTL clock synthesizer designed for

Ethernet applications. The device generates a 125MHz clock signal

from a 25MHz crystal with excellent phase jitter performance. The

device uses IDT’s fourth generation FemtoClock^®NG technology for

an optimum of high clock frequency, low phase noise performance

and low power consumption.The device supports 2.5V or 3.3V

voltage supply and is packaged in a small, lead-free (RoHS 6) 8-lead

TSSOP package. The extended temperature range supports

wireless infrastructure, telecommunication and networking end

equipment requirements. The device is a member of the

• Fourth generation FemtoClock^®NG technology

• 125MHz output clock synthesized from a 25MHz fundamental

mode crystal

• One 2.5V or 3.3V LVCMOS/LVTTL clock output

• Crystal interface designed for a 12pF parallel resonant crystal

• RMS phase jitter @ 125MHz, using a 25MHz crystal

(1.875MHz - 20MHz): 0.156ps (maximum)

• RMS phase jitter @ 100MHz, using a 20MHz crystal

(12kHz - 20MHz): 0.451ps (maximum)

high-performance clock family from IDT.

• LVCMOS interface level for the output enable input

• Full 2.5V or 3.3V supply voltage

• Lead-free (RoHS 6) packaging

• -40°C to 85°C ambient operating temperature

• Use replacement part 840N202CKI-dddLF

Frequency Table

f_XTAL(MHz)

Q Output Frequency (MHz)

100

125

Function Table

Input

Output Enable

Output Q is disabled in high-impedance state

Output Q is enabled.

1 (default)

NOTE: OE is an asynchronous control.

Pin Assignment

Block Diagram

VDDA

XTAL_OUT

XTAL_IN

VDD

GND

DNU

XTAL_IN

PFD

FemtoClock^®NG

VCO

490-637.5MHz

OSC

÷5

LPF

XTAL_OUT

840N021

÷25

8-lead TSSOP

4.40mm x 3.0mm x 0.925mm

package body

Pullup

G Package

Top View

840N021 REVISION A 8/14/15

12 3 4 5 6 7...13

中文翻译

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