Micrel DSC2311KL2R0002 Crystal-lessâ ¢ configurable two output clock generator Datasheet

DSC2311
Crystal-less™ Configurable Two Output Clock Generator
General Description
Features
The DSC2311 is a crystal-less clock
generator that is factory configurable to
simultaneously
output
two
separate
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
supply voltages and temperatures.
By
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.
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 crystalless 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.
 Two Simultaneous CMOS Outputs:
o Output 1 Range: 2.3 to 170 MHz
o Output 2 Range: 2.3 to 170 MHz
 Low RMS Phase Jitter: <1 ps (typ)
 High Stability: ±25, ±50 ppm
 Wide Temperature Range
o Automotive: -55° to 125° C
o Ext. Industrial: -40° to 105° C
o Industrial: -40° to 85° C
o Ext. commercial: -20° to 70° C
 High Supply Noise Rejection: -50 dBc
 High Shock & Vibration Immunity
o Qualified to MIL-STD-883
 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
Block Diagram
Control Circuitry
MEMS
OE
PLL
Output
Control
and
Divider
Fout1
Fout2
 Consumer Electronics
 Camera and Imaging Modules
 Home Automation
 Industrial and Power Conversion
 Mobile Communications, Internet,
and Sensor Devices
 Solid State, Hard Drive, and
Flash Drive Storage
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DSC2311
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MK-QB-P-D-130103-04
DSC2311
Crystal-less™ Configurable Two Output Clock Generator
Specifications (Unless specified otherwise: T=25° C, VDD =3.3V)
Parameter
Condition
Supply Voltage1
VDD
Supply Current2
IDD
Frequency Stability6
Δf
Aging
Startup Time3
Input Logic Levels
Input logic high
Input logic low
Output Disable Time4
Δf
tSU
2
Pull-Up Resistor
21
Includes frequency variations due
to initial tolerance, temp. and
power supply voltage
1 year @25°C
T=25°C
0.75xVDD
-
VOH
VOL
f0
20% to 80%
CL=15pf
Output Duty Cycle
Period Jitter5
SYM
JPER
Integrated Phase Noise
JCC
1.1
1.4
Commercial/Industrial temp range
Automotive temp range
Max.
2.3
45
FO1=FO2=25 MHz
200kHz to 20MHz @ 25 MHz
100kHz to 20MHz @ 25 MHz
12kHz to 20MHz @ 25 MHz
3
0.3
0.38
1.7
Unit
3.6
V
23
mA
±25
±50
ppm
±5
5
ppm
ms
0.25xVDD
5
V
ns
20
ns
40
0.9xVDD
-
I=±6mA
tR
tF
Frequency
3.
4.
5.
6.
EN pin low – outputs are disabled
Pull-up exists on all digital IO
Output Logic Levels
Output logic high
Output logic low
Output Transition time4
Rise Time
Fall Time
Typ.
2.25
VIH
VIL
tDA
tEN
Output Enable Time
Notes:
1.
2.
Min.
kΩ
0.1xVDD
V
2
2
170
100
55
ns
2
MHz
%
psRMS
psRMS
Pin 4 VDD should 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.
tsu is time to 100PPM stable output frequency after VDD is 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 [email protected]
Absolute Maximum Ratings
Item
Min
Max
Unit
Supply Voltage
-0.3
+4.0
V
Input Voltage
-0.3
VDD+0.3
V
Junction Temp
-
+150
°C
Storage Temp
-55
+150
°C
Soldering Temp
-
+260
°C
ESD
HBM
MM
CDM
-
Condition
40sec max.
V
4000
400
1500
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DSC2311
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MK-QB-P-D-130103-04
DSC2311
Crystal-less™ Configurable Two Output Clock Generator
Current Consumption
ΔIDD / Output vs. Freq & Load @ 3.3V VDD
18
16
14
ΔIDD mA
12
10
3pF
8
5pf
6
10pf
15pf
4
2
0
0
20
40
60
80
100
120
140
Fout MHz
Total Current = Disabled Current + Δ IDD Fout1 + Δ IDD Fout2
Solder Reflow Profile
Se
ax
cM
3C
/Se
25°C
60-180
Sec
Pre heat
8 min max
Reflow
a x.
150°C
60-150
Sec
M
ec
.
3C
/
217°C
200°C
S
6C/
Temperature (°C)
cM
ax
.
260°C
20-40
Sec
Cool
Time
6 QFN
MSL 1 @ 260°C refer to JSTD-020C
Ramp-Up Rate (200°C to Peak Temp)
3°C/Sec Max.
Preheat Time 150°C to 200°C
60-180 Sec
Time maintained above 217°C
60-150 Sec
Peak Temperature
255-260°C
Time within 5°C of actual Peak
20-40 Sec
Ramp-Down Rate
6°C/Sec Max.
Time 25°C to Peak Temperature
8 min Max.
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MK-QB-P-D-130103-04
DSC2311
Crystal-less™ Configurable Two Output Clock Generator
OE Function and Output Waveform: LVCMOS
tR
tF
VOH
Output
VOL
tEN
1/fo
tDA
VIH
Enable
VIL
Package Dimensions
EXTERNAL DIMENSIONS
Units: mm [ inches]
2.5±0.05 [0.098±0.002]
RECOMMENDED SOLDER PAD LAYOUT
Units: mm [ inches]
0.7±0.1 [0.079±0.002]
0.825 [0.032]
6
5
4
4
5
Via to
Power Trace
6
0.375
Via to Ground
Plane
0.6 REF
0.535 REF
0.7 REF
1
2
3
0.7±0.1 [0.079±0.002]
3
2
1
0.765±0.1
6
5
4
1
2
3
2.0±0.05 [0.079±0.002]
0.65±0.05 [0.026±0.002]
0.85±0.05
0.25±0.05 [0.099±0.002]
No.
1
2
3
4
5
Pin Terminal
Enable
N/C
Ground
CLK0
CLK1
6
VDD
0.85
0.65±0.05 [0.026±0.002]
0.25±0.05 [0.099±0.002]
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DSC2311
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MK-QB-P-D-130103-04
DSC2311
Crystal-less™ Configurable Two Output Clock Generator
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
Fout1 MHz
Fout2 MHz
R0001
127
127
R0002
25
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
● Email: [email protected]
●
●
USA
www.micrel.com
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DSC2311
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MK-QB-P-D-130103-04
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