MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MDS2011B
ICRO
C
LOCK
Pin Assignment
Suggested Layout
MK2011
Fast Ethernet Clock Source
20.00 MHz in
(crystal caps not
shown)
Pin 1
8
7
X1/ICLK
VDD
GND
25M
1
2
3
4
8
7
6
5
X2
20M
GND
50M
G
4
5
V
0.1µF
2
3
20MHz
out
33Ω (optional)
6
8 pin SOIC
33Ω (optional)
33Ω (optional)
Pin Descriptions
Number
1
2
3
4
5
6
7
8
Name
X1/ICLK
VDD
GND
25M
50M
GND
20M
X2
Type
I
P
P
O
O
P
O
O
25MHz out
50MHz out
Description
Crystal Connection. Connect to a 20.000 MHz crystal or clock.
Connect to +5V.
Connect to ground.
25.000 MHz clock output.
50.000 MHz clock output.
Connect to ground.
20.000 MHz buffered crystal clock output.
Crystal Connection to a 20.000 MHz crystal, or leave unconnected for clock input.
Key: I = Input, O = output, P = power supply connection
External Components/Crystal Selection
A minimum number of external components are required for proper oscillation. For a crystal input, one
22pF load capacitor should be connected to each of the X1 and X2 pins and ground, and a parallel
resonant 20.000 MHz, 16pF load, crystal is recommended. The frequency tolerance of the crystal should
be 50ppm or better. For a clock input, connect to X1 and leave X2 unconnected. A decoupling capacitor of
0.1µF should be connected between VDD and GND on pins 2 and 3, and 33Ω terminating resistors
should be used on clock outputs with traces longer than 1 inch.
2
Revision 12057
Printed 12/5/97
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MDS2011B
ICRO
C
LOCK
Electrical Specifications
Parameter
Supply Voltage, VDD
Inputs
Clock Outputs
Ambient Operating Temperature
Soldering Temperature
Storage temperature
Operating Voltage, VDD
Input High Voltage, VIH, input clock only
Input Low Voltage, VIL, input clock only
Output High Voltage, VOH
Output High Voltage, VOH
Output Low Voltage, VOL
Operating Supply Current, IDD, 5V
Operating Supply Current, IDD, 3.3V
Input Capacitance
Actual Mean Frequency versus Target
Conditions
Referenced to GND
Referenced to GND
Referenced to GND
Max of 20 seconds
MK2011
Fast Ethernet Clock Source
Minimum
Typical
Maximum
7
VDD+.5V
VDD+.5V
70
260
150
5.5
Units
V
V
V
°C
°C
°C
V
V
V
V
V
V
mA
mA
pF
ppm
ABSOLUTE MAXIMUM RATINGS (note 1)
-0.5
-0.5
0
-65
4.5
3.5
VDD-0.4
2.4
0.4
19
10
7
0
DC CHARACTERISTICS (at 5.0V unless otherwise noted)
Clock input
Clock input
IOH=-4mA
IOH=-25mA
IOL=25mA
No Load
No Load
With exact crystal
2.5
2.5
1.5
AC CHARACTERISTICS
Input Clock or Crystal Frequency
20.0000
MHz
Input Crystal Accuracy
50
ppm
Input Clock Duty Cycle, 20.000MHz
Time above 2.5V
20
80
%
Output Clock Rise Time
0.8 to 2.0V
1.5
ns
Output Clock Fall Time
2.0 to 0.8V
1.5
ns
Output Clock Duty Cycle
Time above 1.5V
45
50
55
%
Absolute Clock Period Jitter, 20 MHz output
-400
250
400
ps
Absolute Clock Period Jitter, 50, 25 MHz clocks
-300
150
300
ps
One Sigma Clock Period Jitter
All outputs
70
ps
Notes:
1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged exposure
to levels above the operating limits but below the Absolute Maximums may affect device reliability.
2. Typical values are at 25°C.
3
Revision 12057
Printed 12/5/97
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MDS2011B
ICRO
C
LOCK
Package Outline and Package Dimensions
8 pin SOIC
MK2011
Fast Ethernet Clock Source
E
Pin 1
H
D
Q
e
b
c
h x 45°
A
Symbol
A
b
D
E
H
e
h
Q
Inches
Min
Max
0.055 0.068
0.013 0.019
0.185 0.200
0.150 0.160
0.225 0.245
.050 BSC
0.015
0.004
0.01
Millimeters
Min
Max
1.397 1.7272
0.330
0.483
4.699
5.080
3.810
4.064
5.715
6.223
1.27 BSC
0.381
0.102
0.254
Ordering Information
Part/Order Number
MK2011S
MK2011STR
Marking
MK2011S
MK2011S
Package
8 pin SOIC
Add tape and reel
Temperature
0-70°C
0-70°C
While the information presented herein has been checked for both accuracy and reliability, MicroClock Incorporated assumes no responsibility for either its use or for the
infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in
normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements
are not recommended without additional processing by MicroClock. MicroClock reserves the right to change any circuitry or specifications without notice. MicroClock does not
authorize or warrant any MicroClock product for use in life support devices or critical medical instruments.
4
Revision 12057
Printed 12/5/97
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
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