DSC2311KE2R0001 [MICREL]

Crystal-lessâ¢ Configurable Two Output Clock Generator;


型号：	DSC2311KE2R0001
厂家：	MICREL SEMICONDUCTOR
描述：	Crystal-lessâ¢ Configurable Two Output Clock Generator
文件：	总5页 (文件大小：632K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

DSC2311

Crystal-less™ Configurable Two Output Clock Generator

General Description

Features

The DSC2311 is a crystal-less clock

generator that is factory configurable to

 Two Simultaneous CMOS Outputs:

o Output 1 Range: 2.3 to 170 MHz

simultaneously

output

two

separate

Output 2 Range: 2.3 to 170 MHz

frequencies from 2.3 to 170 MHz. The clock

generator uses proven silicon MEMS

technology to provide low jitter and high

frequency stability across a wide range of

 Low RMS Phase Jitter: <1 ps (typ)

 High Stability: ±25, ±50 ppm

supply voltages and temperatures.

 Wide Temperature Range

o Automotive: -55° to 125° C

o Ext. Industrial: -40° to 105° C

o Industrial: -40° to 85° C

eliminating the external quartz crystal,

crystal-less clock generators significantly

enhance reliability and accelerate product

development, while meeting stringent clock

performance criteria for a variety of

consumer electronics, communications, and

storage applications.

o Ext. commercial: -20° to 70° C

 High Supply Noise Rejection: -50 dBc

 High Shock & Vibration Immunity

o Qualified to MIL-STD-883

DSC2311 has an Output Enable / Disable

feature allowing it to disable the outputs

when OE is low. The device is available in a

space saving 6 pin 2.5 x 2.0 mm crystal-

less TDFN package that uses only a single

external bypass capacitor. This requires a

PCB footprint equivalent to that of a 1.0 x

1.0 mm crystal-based clock generator.

 High Reliability

o 20x higher MTBF than crystal-based

clock generator designs

 Supply Range of 2.25 to 3.6 V

 Short Lead Times: 2 Weeks

 Lead Free & RoHS Compliant

Applications

 Consumer Electronics

 Camera and Imaging Modules

 Home Automation

Block Diagram

Control Circuitry

 Industrial and Power Conversion

 Mobile Communications, Internet,

and Sensor Devices

 Solid State, Hard Drive, and

Flash Drive Storage

Fout1

Output

Control

and

MEMS

PLL

Divider

Fout2

______________________________________________________________________________________________________________________________________________

DSC2311 Page 1 MK-QB-P-D-130103-04

Crystal-less™ Configurable Two Output Clock Generator

DSC2311

Specifications (Unless specified otherwise: T=25° C, VDD =3.3V)

Parameter

Supply Voltage¹

Condition

Min.

2.25

Typ.

Max.

3.6

Unit

V_DD

I_DD

Supply Current²

Frequency Stability⁶

Aging

EN pin low – outputs are disabled

Includes frequency variations due

to initial tolerance, temp. and

power supply voltage

±25

±50

Δf

ppm

Δf

t_SU

1 year @25°C

T=25°C

±5

ppm

Startup Time³

Input Logic Levels

Input logic high

Input logic low

V_IH

V_IL

0.75xV_DD

0.25xV_DD

Output Disable Time⁴

Output Enable Time

Pull-Up Resistor²

t_DA

t_EN

Pull-up exists on all digital IO

I=±6mA

kΩ

Output Logic Levels

Output logic high

Output logic low

Output Transition time⁴

Rise Time

V_OH

V_OL

0.9xV_DD

0.1xV_DD

20% to 80%

C_L=15pf

t_R

t_F

1.1

1.4

Fall Time

Commercial/Industrial temp range

Automotive temp range

2.3

170

100

Frequency

f₀

MHz

Output Duty Cycle

Period Jitter⁵

SYM

J_PER

ps_RMS

F_O1=F_O2=25 MHz

200kHz to 20MHz @ 25 MHz

100kHz to 20MHz @ 25 MHz

12kHz to 20MHz @ 25 MHz

0.3

0.38

1.7

Integrated Phase Noise

J_CC

ps_RMS

Notes:

Pin 4 V_DDshould be filtered with 0.01uf capacitor.

Output is enabled if Enable pad is floated or not connected. Operating current = Discabled Current + ΔIDD from Fout1 + ΔIDD from Fout2. See Current Consumption

graph on next page.

t_suis time to 100PPM stable output frequency after V_DDis applied and outputs are enabled.

Output Waveform and Test Circuit figures below define the parameters.

Period Jitter includes crosstalk from adjacent output.

For other ppm stabilities, contact the factory at sales@discera.com

Absolute Maximum Ratings

Item

Min

-0.3

Max

Unit

Condition

Supply Voltage

Input Voltage

Junction Temp

Storage Temp

Soldering Temp

+4.0

V_DD+0.3

+150

°C

-55

+150

+260

40sec max.

ESD

HBM

4000

400

CDM

1500

______________________________________________________________________________________________________________________________________________

DSC2311 Page 2 MK-QB-P-D-130103-04

Crystal-less™ Configurable Two Output Clock Generator

DSC2311

Current Consumption

ΔIDD / Output vs. Freq & Load @ 3.3V VDD

3pF

5pf

10pf

15pf

100

120

140

Fout MHz

Total Current = Disabled Current + Δ IDD Fout1 + Δ IDD Fout2

Solder Reflow Profile

20-40

Sec

260°C

217°C

200°C

60-150

Sec

Reflow

60-180

Sec

150°C

Cool

Pre heat

25°C

Time

8 min max

6 QFN

MSL 1 @ 260°C refer to JSTD-020C

Ramp-Up Rate (200°C to Peak Temp)

Preheat Time 150°C to 200°C

Time maintained above 217°C

Peak Temperature

Time within 5°C of actual Peak

Ramp-Down Rate

3°C/Sec Max.

60-180 Sec

60-150 Sec

255-260°C

20-40 Sec

6°C/Sec Max.

8 min Max.

Time 25°C to Peak Temperature

______________________________________________________________________________________________________________________________________________

DSC2311 Page 3 MK-QB-P-D-130103-04

Crystal-less™ Configurable Two Output Clock Generator

DSC2311

OE Function and Output Waveform: LVCMOS

t_R

t_F

V_OH

Output

Enable

V_OL

t_EN

1/f_o

t_DA

V_IH

V_IL

Package Dimensions

EXTERNAL DIMENSIONS

Units: mm [ inches]

RECOMMENDED SOLDER PAD LAYOUT

Units: mm [ inches]

2.5±0.05 [0.098±0.002]

0.7±0.1 [0.079±0.002]

0.825 [0.032]

0.6 REF

Via to

Power Trace

0.375

Via to Ground

Plane

0.535 REF

0.765±0.1

0.7 REF

0.7±0.1 [0.079±0.002]

2.0±0.05 [0.079±0.002]

0.65±0.05 [0.026±0.002]

0.25±0.05 [0.099±0.002]

0.85

0.65±0.05 [0.026±0.002]

0.25±0.05 [0.099±0.002]

No.

Pin Terminal

Enable

N/C

0.85±0.05

Ground

CLK0

CLK1

VDD

______________________________________________________________________________________________________________________________________________

DSC2311 Page 4 MK-QB-P-D-130103-04

Crystal-less™ Configurable Two Output Clock Generator

DSC2311

Ordering Information

DSC2311

K I 2 - R0001 T

Package

K: 2520 QFN package

Packing

T: Tape & Reel

: Tube

Temp Range

E: -20 to 70

I: -40 to 85

L: -40 to 105

M: -55 to 125

Frequency Code

Rxxxx: Custom

Stability

1: ±50ppm

2: ±25ppm

Output Clock Frequencies

Output frequencies are factory configured to individual customer and product requirements, subject

to output control and divider limitations. Contact sales with your custom frequency needs.

Frequency Code

R0001

Fout1 MHz

127

Fout2 MHz

127

R0002

125

Disclaimer:

Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information

is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and

descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted

by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims

any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose,

merchantability, or infringement of any patent, copyright or other intellectual property right.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can

reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the

body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or

sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any

damages resulting from such use or sale.

MICREL, Inc.

Phone: +1 (408) 944-0800

●

2180 Fortune Drive,

Fax: +1 (408) 474-1000

San Jose, California

95131

●

USA

●

Email: hbwhelp@micrel.com

www.micrel.com

______________________________________________________________________________________________________________________________________________

DSC2311 Page 5 MK-QB-P-D-130103-04

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