DSC2311
Crystal-less™ Configurable Two Output Clock Generator
General Description
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 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.
Features
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: ±10, ±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
PLL
Output
Control
and
Divider
CLK0
OE
CLK1
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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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
Supply Voltage
1
Condition
V
DD
I
DD
Δf
Δf
t
SU
V
IH
V
IL
t
DA
t
EN
Pull-up exists on all digital IO
V
OH
V
OL
t
R
t
F
f
0
SYM
J
PER
J
CC
I=±6mA
20% to 80%
C
L
=15pf
Commercial/Industrial temp range
Automotive temp range
F
O1
=F
O2
=25 MHz
200kHz to 20MHz @ 25 MHz
100kHz to 20MHz @ 25 MHz
12kHz to 20MHz @ 25 MHz
EN pin high – outputs are enabled
C
L
=15pF, F
O1
=F
O2
=25 MHz
Includes frequency variations due
to initial tolerance, temp. and
power supply voltage
1 year @25°C
T=25°C
Min.
2.25
Typ.
25
Max.
3.6
28
±10
±25
±50
±5
5
Unit
V
mA
ppm
ppm
ms
V
ns
ns
kΩ
Supply Current
2
Frequency Stability
Aging
Startup Time
3
Input Logic Levels
Input logic high
Input logic low
Output Disable Time
4
Output Enable Time
Pull-Up Resistor
2
Output Logic Levels
Output logic high
Output logic low
Output Transition time
4
Rise Time
Fall Time
Frequency
Output Duty Cycle
Period Jitter
5
Integrated Phase Noise
Notes:
1.
2.
3.
4.
5.
0.75xV
DD
-
-
0.25xV
DD
5
20
40
0.9xV
DD
-
1.1
1.4
2.3
45
3
0.3
0.38
1.7
-
0.1xV
DD
2
2
170
100
55
V
ns
MHz
%
ps
RMS
ps
RMS
2
Pin 4 V
DD
should be filtered with 0.01uf capacitor.
Output is enabled if Enable pad is floated or not connected.
t
su
is time to 100PPM stable output frequency after V
DD
is applied and outputs are enabled.
Output Waveform and Test Circuit figures below define the parameters.
Period Jitter includes crosstalk from adjacent output.
Absolute Maximum Ratings
Item
Supply Voltage
Input Voltage
Junction Temp
Storage Temp
Soldering Temp
ESD
HBM
MM
CDM
Min
-0.3
-0.3
-
-55
-
-
Max
+4.0
V
DD
+0.3
+150
+150
+260
4000
400
1500
Unit
V
V
°C
°C
°C
V
Condition
40sec max.
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MK-QB-P-D-130103-04
DSC2311
Crystal-less™ Configurable Two Output Clock Generator
Solder Reflow Profile
20-40
Sec
Temperature (°C)
217
°
C
200
°
C
.
ax
3C
/
Se
cM
ax
60-150
Sec
260
°
C
.
S
6C/
6C/
6C/
c
c
ec
Ma
Ma
Ma
150
°
C
Se
cM
60-180
Sec
Reflow
.
.
x.
3C
/
Pre heat
8 min max
Cool
Time
25
°
C
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.
OE Function and
Output Waveform: LVCMOS
t
R
V
OH
t
F
Output
V
OL
675 mV
1/f
o
t
DA
V
IH
t
EN
Enable
V
IL
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DSC2311
Crystal-less™ Configurable Two Output Clock Generator
Package Dimensions
EXTERNAL DIMENSIONS
Units: mm [ inches]
2.5±0.05 [0.098±0.002]
0.825 [0.032]
6
5
4
0.6 REF
0.535 REF
0.7 REF
6
1
2
3
0.7±0.1 [0.079±0.002]
3
2
1
0.765±0.1
1
2.0±0.05 [0.079±0.002]
0.65±0.05 [0.026±0.002]
0.25±0.05 [0.099±0.002]
0.65±0.05 [0.026±0.002]
0.25±0.05 [0.099±0.002]
0.85
5
2
4
3
4
5
6
Via to Ground
Plane
0.7±0.1 [0.079±0.002]
Via to
Power Trace
0.375
RECOMMENDED SOLDER PAD LAYOUT
Units: mm [ inches]
0.85±0.05
No.
1
2
3
4
5
6
Pin Terminal
Enable
N/C
Ground
CLK0
CLK1
VDD
Ordering
Information
DSC2311
Package
K: 2520 6pin Dual Output
Temp Range
E: -20 to 70
I: -40 to 85
L: -40 to 105
M: -55 to 125
Stability
1: ±50ppm
2: ±25ppm
5: ±10ppm
K I 2 - R0001 T
Packing
T: Tape & Reel
: Tube
Frequency Code
Rxxxx: Custom
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DSC2311
Crystal-less™ Configurable Two Output Clock Generator
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
R0002
Freq out 1 MHz
127
25
Freq Out 2 MHz
127
125
Disclaimer:
Discera makes no warranty of any kind, express or implied, with regard to this material,
including, but not limited to, the implied warranties of merchantability and fitness for a
particular purpose. Discera reserves the right to make changes without further notice to
materials described herein. Discera does not assume any liability arising from the
application or use of any product or circuit described herein. Discera does not authorize its
products for use a critical components in life-support systems where a malfunction or
failure may reasonably be expected to result in significant injury to the user. The inclusion
of Discera’s product in a life-support systems application implies that the manufacturer
assumes all risk of such use and in doing so indemnifies Discera against all charges.
DISCERA, Inc.
●
Phone: +1 (408) 432-8600
1961 Concourse Drive,
San Jose, California
95131
●
Fax: +1 (408) 432-8609 ● Email: sales@discera.com
●
●
USA
www.discera.com
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MK-QB-P-D-130103-04
