ICS5OSK482TILFT [ICSI]
48 MHz Tiny USB Clock Source; 48 MHz的微型USB时钟源
| 型号： | ICS5OSK482TILFT |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | 48 MHz Tiny USB Clock Source |
| 文件： | 总5页 (文件大小：110K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
P R E L I M I N A R Y I N F O R M AT I O N
ICS5OSK482
48 MHz Tiny USB Clock Source
Description
Features
The ICS5OSK482 is a low cost integrated clock
synthesizer solution designed for replacing crystals
and crystal oscillators.
• 25 MHz crystal input
• The 48.00 MHz CLK output is USB2.0 reference
clock compliant
The ICS5OSK482 generates a very accurate 48.00
MHz clock output.
• 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
VDD
X1
Crystal
Oscillator
X2
PLL
CLK
External capacitors are
required with a crystal input.
GND
MDS 5OSK482 B
1
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 AT I O N
ICS5OSK482
48 MHz Tiny USB Clock Source
Pin Assignment
5
X 2
X 1
G N D
C L K
1
2
3
V D D
4
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
25 MHz crystal input. Connect to a parallel resonant fundamental crystal.
1
2
3
4
5
X1
GND
CLK
VDD
X2
Input
Power Connect to ground.
Output PLL output clock. Internal pull-down resistor.
Power Connect to 3.3 V.
Output 25 MHz crystal output.
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 -6 pF)*2. In this equation, C = crystal load
L
L
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].
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 AT I O N
ICS5OSK482
48 MHz Tiny USB Clock Source
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.
Item
Rating
Supply Voltage, VDD
All Inputs and Outputs
7 V
-0.5 V to VDD+0.5 V
-40 to +85°C
-65 to +150°C
260°C
Ambient Operating Temperature
Storage Temperature
Soldering Temperature
Recommended Operation Conditions
Parameter
Min.
Typ.
Max.
+85
Units
°C
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
-40
+3.135
+3.465
V
DC Electrical Characteristics
Unless stated otherwise, VDD=3.3 V 5% , Ambient temperature 0 to +70°C, CL=15pF
Parameter
Symbol Conditions
Min.
3.135
2.0
Typ.
Max.
Units
V
Operating Voltage
VDD
3.465
Input High Voltage
V
OE
OE
V
IH
Input Low Voltage
V
0.8
V
IL
Output High Voltage
Output Low Voltage
V
I
I
= -12 mA
= 12 mA
2.4
V
OH
OH
OL
V
0.4
V
OL
IDD Operating Supply Current
Short Circuit Current
On-Chip Pull-up Resistor
Input Capacitance
No load
CLK output
OE
TBD
+70
270
4
mA
mA
kΩ
pF
Ω
Nominal Output Impedance
20
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 AT I O N
ICS5OSK482
48 MHz Tiny USB Clock Source
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V 5%, Ambient Temperature -40 to +85° C, CL=15pF
Parameter
Input Frequency, crystal input
Output Frequency, VDD = 3.3 V 5%
Output Clock Rise Time
Symbol
Conditions
Min. Typ. Max. Units
F
25
48
MHz
MHz
ns
IN
F
-40°C to +85°C
0.8 to 2.0 V, Note 1
2.0 to 8.0 V, Note 1
1.5 V
OUT
t
1
OR
Output Clock Fall Time
t
1
ns
OF
OD
Output Clock Duty Cycle
t
45
49-51
50
55
%
Output Enable Time, OE high to
output on
ns
Output Disable Time, OE low to
tri-state
50
ns
ps
Absolute Clock Period Jitter
t
Deviation from
mean, Note 1
TBD
ja
Note 1: Measured with 15 pF load.
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 AT I O N
ICS5OSK482
48 MHz Tiny USB Clock Source
Package Outline and Package Dimensions (5-pin TSOT)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
Symbol
Min
—
Max
1.00
0.10
0.90
0.45
0.20
A
A1
A2
b
0.01
0.84
0.30
0.12
c
D
E
E1
e
e1
L
2.90 BASIC
2.80 BASIC
1.60 BASIC
0.95 BASIC
1.90 BASIC
0.30
0.60 REF
0.25 BASIC
0.50
L1
L2
0°
8°
θ
aaa
—
0.10
Ordering Information
Part / Order Number
ICS5OSK482TILF
Marking
TBD
Shipping Packaging
Tubes
Package
5-pin TSOT
5-pin TSOT
Temperature
-40 to +85° C
-40 to +85° C
ICS5OSK482TILFT
TBD
Tape and Reel
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.
MDS 5OSK482 B
5
Revision 111805
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
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