841N254AKI datasheet, PDF - EEWORLD Datasheet

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841N254AKI: Description250 MHz, OTHER CLOCK GENERATOR, QCC32; Categorysemiconductor The embedded processor and controller; File Size275KB，23 Pages; ManufacturerIDT (Integrated Device Technology, Inc.); Websitehttp://www.idt.com/

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841N254AKI Overview

250 MHz, OTHER CLOCK GENERATOR, QCC32

841N254AKI Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	32
Maximum operating temperature	85 Cel
Minimum operating temperature	-40 Cel
Maximum supply/operating voltage	2.62 V
Minimum supply/operating voltage	2.38 V
Rated supply voltage	2.5 V
Processing package description	5 × 5 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, MO-220VHHD-2, VFQFN-32
Lead-free	Yes
EU RoHS regulations	Yes
state	DISCONTINUED
Craftsmanship	CMOS
packaging shape	SQUARE
Package Size	Chip CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
surface mount	Yes
Terminal form	NO
Terminal spacing	0.5000 mm
terminal coating	MATTE Tin
Terminal location	Four
Packaging Materials	UNSPECIFIED
Temperature level	INDUSTRIAL
Microprocessor type	Other clock generators
Maximum FCLK output frequency	250 MHz
Rated master clock crystal frequency	25 mHz

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FEMTOCLOCK

Crystal-to-LVDS/HCSL Clock Synthesizer

ICS841N254I

DATA SHEET

General Description

The ICS841N254I is a 4-output clock synthesizer designed for S-RIO

1.3 and 2.0 reference clock applications. The device generates four

copies of a selectable 250MHz, 156.25MHz, 125MHz or 100MHz

clock signal with excellent phase jitter performance. The four outputs

are organized in two banks of two LVDS and two HCSL ouputs.The

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

an optimum of high clock frequency and low phase noise

performance, combined with a low power consumption and high

power supply noise rejection. The synthesized clock frequency and

the phase-noise performance are optimized for driving RIO 1.3 and

2.0 SerDes reference clocks. The device supports 3.3V and 2.5V

voltage supplies and is packaged in a small 32-lead VFQFN

package. The extended temperature range supports wireless

infrastructure, telecommunication and networking end equipment

requirements.

Features

•

Fourth generation FemtoClock® (NG) technology

Selectable 250MHz, 156.25MHz, 125MHz or 100MHz output

clock synthesized from a 25MHz fundamental mode crystal

Four differential clock outputs (two LVDS and two HCSL outputs)

Crystal interface designed for 25MHz,

parallel resonant crystal

RMS phase jitter @ 156.25MHz, using a 25MHz crystal

(1MHz - 20MHz): 0.27ps (typical)

RMS phase jitter @ 156.25MHz, using a 25MHz crystal

(12kHz - 20MHz): 0.32ps (typical)

Power supply noise rejection PSNR: -50dB (typical)

LVCMOS interface levels for the frequency select input

Full 3.3V or 2.5V supply voltage

Available in both standard (RoHS 5) and Lead-free (RoHS 6)

packages

-40°C to 85°C ambient operating temperature

DDOB

nQB0

nQB1

F_SEL0

GND

Function Table

Output Frequency with

XTAL

= 25MHz

156.25MHz

125MHz

100MHz

250MHz

QB0

QB1

Inputs

F_SEL1

0 (default)

F_SEL0

0 (default)

Pin Assignment

32 31 30 29 28 27 26 25

24 IREF

ICS841N254I

32-lead VFQFN

K Package

5mm x 5mm x 0.925mm

package body

Top View

23 GND

22 nQA0

21 QA0

20 V

DDOA

19 nQA1

18 QA1

17 GND

DDA

nc 4

GND

REF_CLK

NOTE: F_SEL[1:0] are asynchronous controls.

nOEA 7

nOEB

10 11 12 13 14 15 16

BYPASS

REF_SEL

XTAL_OUT

XTAL_IN

F_SEL1

Block Diagram

XTAL_IN

OSC

XTAL_OUT

REF_CLK

REF_SEL

BYPASS

F_SEL[0:1]

nOEA

nOEB

IREF

Pulldown

PFD

LPF

FemtoClock® NG

VCO

625MHz

÷25

÷N

QA0

nQA0

QA1

nQA1

QB0

nQB0

QB1

nQB1

LVDS

Pulldown

HCSL

ICS841N254AKI REVISION A APRIL 18, 2011

841N254AKI Related Products

	841N254AKI	841N254AKILF	841N254AKIT	ICS841N254I
Description	250 MHz, OTHER CLOCK GENERATOR, QCC32	250 MHz, OTHER CLOCK GENERATOR, QCC32	250 MHz, OTHER CLOCK GENERATOR, QCC32	250 MHz, OTHER CLOCK GENERATOR, QCC32
Number of functions	1	1	1	1
Number of terminals	32	32	32	32
Maximum operating temperature	85 Cel	85 Cel	85 Cel	85 Cel
Minimum operating temperature	-40 Cel	-40 Cel	-40 Cel	-40 Cel
Maximum supply/operating voltage	2.62 V	2.62 V	2.62 V	2.62 V
Minimum supply/operating voltage	2.38 V	2.38 V	2.38 V	2.38 V
Rated supply voltage	2.5 V	2.5 V	2.5 V	2.5 V
Processing package description	5 × 5 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, MO-220VHHD-2, VFQFN-32	5 × 5 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, MO-220VHHD-2, VFQFN-32	5 × 5 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, MO-220VHHD-2, VFQFN-32	5 × 5 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, MO-220VHHD-2, VFQFN-32
Lead-free	Yes	Yes	Yes	Yes
EU RoHS regulations	Yes	Yes	Yes	Yes
state	DISCONTINUED	DISCONTINUED	DISCONTINUED	DISCONTINUED
Craftsmanship	CMOS	CMOS	CMOS	CMOS
packaging shape	SQUARE	SQUARE	SQUARE	SQUARE
Package Size	Chip CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	Chip CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	Chip CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	Chip CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
surface mount	Yes	Yes	Yes	Yes
Terminal form	NO	NO	NO	NO
Terminal spacing	0.5000 mm	0.5000 mm	0.5000 mm	0.5000 mm
terminal coating	MATTE Tin	MATTE Tin	MATTE Tin	MATTE Tin
Terminal location	Four	Four	Four	Four
Packaging Materials	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Temperature level	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
Microprocessor type	Other clock generators	Other clock generators	Other clock generators	Other clock generators
Maximum FCLK output frequency	250 MHz	250 MHz	250 MHz	250 MHz
Rated master clock crystal frequency	25 mHz	25 mHz	25 mHz	25 mHz

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