![](http://datasheet.mmic.net.cn/30000/MK2720STRLF_datasheet_2088183/MK2720STRLF_3.png)
MK2720
Low Cost 27 + 54 MHz VCXO
MDS 2720 B
3
Revision 031398
Printed 11/16/00
MicroClock Division of ICS1271 Parkmoor Ave.San JoseCA95126(408)295-9800tel(408)295-9818fax
PRELIMINARY INFORMATION
I C R O
C LOC K
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply voltage, VDD
Referenced to GND
7
V
Inputs and Clock Outputs
Referenced to GND
-0.5
VDD+0.5
V
Ambient Operating Temperature
0
70
°C
Soldering Temperature
Max of 10 seconds
260
°C
Storage temperature
-65
150
°C
DC CHARACTERISTICS (VDD = 5.0V unless noted)
Operating Voltage, VDD
4.75
5.25
V
Output High Voltage, VOH
IOH=-25mA
2.4
V
Output Low Voltage, VOL
IOL=25mA
0.4
V
Output High Voltage, VOH, CMOS level
IOH=-8mA
VDD-0.4
V
Operating Supply Current, IDD
No Load
25
mA
Short Circuit Current
±100
mA
VIN, VCXO control voltage
0
3
V
AC CHARACTERISTICS (VDD = 5.0V unless noted)
Input Crystal Frequency
13.50000
MHz
Input Crystal Accuracy
±30
ppm
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
At 1.4V
45
50
55
%
Maximum Absolute Jitter, short term
200
ps
Output pullability, note 2
0V
≤ VIN ≤ 3V
±100
ppm
Electrical Specifications
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. With a MicroClock approved pullable crystal.
External Components
The MK2720 requires a minimum number of external components for proper operation. A decoupling
capacitor of 0.1F should be connected between VDD and GND on pins 2 and 4, as close to the MK2720
as possible. A series termination resistor of 33
may be used for the clock output. The input crystal must be
connected as close to the chip as possible. The input crystal should be a parallel mode, pullable, AT cut,
13.5MHz, with 14pF load capacitance. Consult MicroClock for recommended suppliers. IMPORTANT -
read application note MAN05 before laying out the PCB.