Datasheet > 8421002IAGIT

8421002IAGIT

更新时间： 2023-07-15 00:00:00

品牌	Logo	应用领域
艾迪悌 - IDT		/
页数	文件大小	规格书
13页	196K
描述
PLL/Frequency Synthesis Circuit

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8421002IAGIT 数据手册

PRELIMINARY

ICS8421002I

FEMTOCLOCKS™ CRYSTAL-TO-

HSTL FREQUENCY SYNTHESIZER

Integrated

Circuit

Systems, Inc.

GENERAL DESCRIPTION

FEATURES

The ICS8421002I is a 2 output HSTL Synthesizer • Two HSTL outputs (VOHmax = 1.4V)

ICS

optimized to generate Fibre Channel reference

• Selectable crystal oscillator interface

HiPerClockS™

clock frequencies and is a member of the

or LVCMOS/LVTTL single-ended input

HiPerClocks^TMfamily of high performance clock

solutions from ICS. Using a 26.5625MHz 18pF

• Supports the following output frequencies: 212.5MHz,

187.5MHz, 159.375MHz, 106.25MHz, 53.125MHz

parallel resonant crystal, the following frequencies can be

generated based on the 2 frequency select pins (F_SEL[1:0]):

212.5MHz, 187.5MHz, 159.375MHz, 106.25MHz and

53.125MHz. The ICS8421002I uses ICS’ 3^rdgeneration low

phase noise VCO technology and can achieve 1ps or lower

typical rms phase jitter, easily meeting Fibre Channel jitter

requirements.The ICS8421002I is packaged in a small 20-pin

TSSOP package.

• VCO range: 560MHz - 680MHz

• RMS phase jitter @ 212.5MHz, using a 26.5625MHz crystal

(637kHz - 10MHz): 0.59ps (typical)

• Power supply modes:

Core/Output

3.3V/1.8V

2.5V/1.8V

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

FREQUENCY SELECT FUNCTION TABLE

PIN ASSIGNMENT

V^DDO

Inputs

Input

Frequency

(MHz)

Output

Frequency

(MHz)

M Divider N Divider

M/N

Divider Value

nQ1

F_SEL1 F_SEL0

GND

V^DD

nQ0

Value

26.5625

23.4375

212.5

159.375

106.25

53.125

187.5

nXTAL_SEL

TEST_CLK

XTAL_IN

XTAL_OUT

F_SEL1

nPLL_SEL

V^DDA

F_SEL0

V^DD

ICS8421002I

20-Lead TSSOP

6.5mm x 4.4mm x 0.92mm

package body

G Package

Top View

BLOCK DIAGRAM

F_SEL[1:0]

Pulldown

nPLL_SEL

F_SEL[1:0]

nQO

Pulldown

TEST_CLK

0 0 ÷3

0 1 ÷4

1 0 ÷6

1 1 ÷12

26.5625MHz

XTAL_IN

Phase

Detector

VCO

OSC

nQ1

XTAL_OUT

Pulldown

nXTAL_SEL

M = 24 (fixed)

Pulldown

The Preliminary Information presented herein represents a product in prototyping or pre-production.The noted characteristics are based on initial

product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.

8421002AGI

www.icst.com/products/hiperclocks.html

REV. A MARCH 29, 2005

12 3 4 5 6 7...13

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