ICS5OSK482
MDS 5OSK482 B
1
Revision 111805
Integrated Circuit Systems, Inc.
525 Race Street, San Jose, CA 95126
tel (408) 297-1201
www.icst.com
48 MHz Tiny USB Clock Source
P R E L I M I N A R Y I N F O R M A T I O N
Description
The ICS5OSK482 is a low cost integrated clock
synthesizer solution designed for replacing crystals
and crystal oscillators.
The ICS5OSK482 generates a very accurate 48.00
MHz clock output.
Features
25 MHz crystal input
The 48.00 MHz CLK output is USB2.0 reference
clock compliant
Output duty cycle 45/55% (worst case)
Advanced, low-power CMOS process
Industrial temperature range (-40 to +85
C)
Packaged in 5-pin TSOT
3.3 V supply voltage
Pb (lead) free package available
Short term C-C Jitter of 100 ps
Block Diagram
Crystal
Oscillator
PLL
CLK
VDD
GND
X2
X1
External capacitors are
required with a crystal input.
48 MHz Tiny USB Clock Source
MDS 5OSK482 B
2
Revision 111805
Integrated Circuit Systems, Inc.
525 Race Street, San Jose, CA 95126
tel (408) 297-1201
www.icst.com
P R E L I M I N A R Y I N F O R M A T I O N
ICS5OSK482
Pin Assignment
Pin Descriptions
External Components
External Crystal
The ICS5OSK482 requires a 14.31818 MHz crystal. In
order to minimize ppm errors, the PCB should include
pads for crystal capacitors from pins X1 to ground and
X2 to ground to optimize the initial accuracy. The
capacitor value can be determined by tuning the PCB
so that the error on the reference output is equal to the
initial crystal error.
Crystal Load Capacitors
The device crystal connections should include pads for
small capacitors from X1 to ground and from X2 to
ground. These capacitors are used to adjust the stray
capacitance of the board to match the nominally
required crystal load capacitance. Because load
capacitance can only be increased in this trimming
process, it is important to keep stray capacitance to a
minimum by using very short PCB traces (and no vias)
been the crystal and device. Crystal capacitors must be
connected from each of the pins X1 and X2 to ground.
The value (in pF) of these crystal caps should equal
(C
L
-6 pF)*2. In this equation, C
L
= crystal load
capacitance in pF. Example: For a crystal with a 8 pF
load capacitance, each crystal capacitor would be 4 pF
[(8-6) x 2 = 4].
X 2
G N D
C L K
X 1
1
2
3
5
4
V D D
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
X1
Input
25 MHz crystal input. Connect to a parallel resonant fundamental crystal.
2
GND
Power
Connect to ground.
3
CLK
Output
PLL output clock. Internal pull-down resistor.
4
VDD
Power
Connect to 3.3 V.
5
X2
Output
25 MHz crystal output.
48 MHz Tiny USB Clock Source
MDS 5OSK482 B
3
Revision 111805
Integrated Circuit Systems, Inc.
525 Race Street, San Jose, CA 95126
tel (408) 297-1201
www.icst.com
P R E L I M I N A R Y I N F O R M A T I O N
ICS5OSK482
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS5OSK482. These ratings,
which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of
the device at these or any other conditions above those indicated in the operational sections of the
specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can
affect product reliability. Electrical parameters are guaranteed only over the recommended operating
temperature range.
Recommended Operation Conditions
DC Electrical Characteristics
Unless stated otherwise, VDD=3.3 V 5%
, Ambient temperature 0 to +70
C, CL=15pF
Item
Rating
Supply Voltage, VDD
7 V
All Inputs and Outputs
-0.5 V to VDD+0.5 V
Ambient Operating Temperature
-40 to +85
C
Storage Temperature
-65 to +150
C
Soldering Temperature
260
C
Parameter
Min.
Typ.
Max.
Units
Ambient Operating Temperature
-40
+85
C
Power Supply Voltage (measured in respect to GND)
+3.135
+3.465
V
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Operating Voltage
VDD
3.135
3.465
V
Input High Voltage
V
IH
OE
2.0
V
Input Low Voltage
V
IL
OE
0.8
V
Output High Voltage
V
OH
I
OH
= -12 mA
2.4
V
Output Low Voltage
V
OL
I
OL
= 12 mA
0.4
V
IDD Operating Supply Current
No load
TBD
mA
Short Circuit Current
CLK output
+70
mA
On-Chip Pull-up Resistor
OE
270
k
Input Capacitance
4
pF
Nominal Output Impedance
20
48 MHz Tiny USB Clock Source
MDS 5OSK482 B
4
Revision 111805
Integrated Circuit Systems, Inc.
525 Race Street, San Jose, CA 95126
tel (408) 297-1201
www.icst.com
P R E L I M I N A R Y I N F O R M A T I O N
ICS5OSK482
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V 5%, Ambient Temperature -40 to +85
C, CL=15pF
Note 1: Measured with 15 pF load.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Input Frequency, crystal input
F
IN
25
MHz
Output Frequency, VDD = 3.3 V 5%
F
OUT
-40
C to +85C
48
MHz
Output Clock Rise Time
t
OR
0.8 to 2.0 V, Note 1
1
ns
Output Clock Fall Time
t
OF
2.0 to 8.0 V, Note 1
1
ns
Output Clock Duty Cycle
t
OD
1.5 V
45
49-51
55
%
Output Enable Time, OE high to
output on
50
ns
Output Disable Time, OE low to
tri-state
50
ns
Absolute Clock Period Jitter
t
ja
Deviation from
mean, Note 1
TBD
ps
48 MHz Tiny USB Clock Source
MDS 5OSK482 B
5
Revision 111805
Integrated Circuit Systems, Inc.
525 Race Street, San Jose, CA 95126
tel (408) 297-1201
www.icst.com
P R E L I M I N A R Y I N F O R M A T I O N
ICS5OSK482
Package Outline and Package Dimensions
(5-pin TSOT)
Package dimensions are kept current with JEDEC Publication No. 95
Ordering Information
Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS)
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 ICS. ICS reserves the right to change any
circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or
critical medical instruments.
Part / Order Number
Marking
Shipping Packaging
Package
Temperature
ICS5OSK482TILF
TBD
Tubes
5-pin TSOT
-40 to +85
C
ICS5OSK482TILFT
TBD
Tape and Reel
5-pin TSOT
-40 to +85
C
Millimeters
Symbol
Min
Max
A
--
1.00
A1
0.01
0.10
A2
0.84
0.90
b
0.30
0.45
c
0.12
0.20
D
2.90 BASIC
E
2.80 BASIC
E1
1.60 BASIC
e
0.95 BASIC
e1
1.90 BASIC
L
0.30
0.50
L1
0.60 REF
L2
0.25 BASIC
0
8
aaa
--
0.10
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