PulseCore ASM3I2853AG-08ST Peak emi reducing solution Datasheet

ASM3P2853A
November 2006
rev 1.3
Peak EMI Reducing Solution
Features
shielding that are required to pass EMI regulations. The
•
Generates an EMI optimized clock signal at
ASM3P2853A modulates the output of PLL in order to
output.
spread the bandwidth of a synthesized clock, thereby
•
Input frequency: 25MHz.
decreasing the peak amplitudes of its harmonics. This
•
Frequency outputs:
results in significantly lower system EMI compared to the
• USB Clock (48MHz unmodulated)
typical narrow band signal produced by oscillators and
• 50MHz (modulated), ±1% centre spread
most clock generators. Lowering EMI by increasing a
•
Modulation rate: 39KHz.
signal’s bandwidth is called spread spectrum clock
•
Spread Spectrum ON/OFF control
generation.
•
Supply voltage range 2.5V ± 5%.
•
Available in 8 Pin SOIC package.
•
Commercial and Industrial Temperature range.
Applications
ASM3P2853A is targeted towards EMI management for
Product Description
high speed digital applications such as PC peripheral
The ASM3P2853A is a versatile spread spectrum
devices, consumer electronics and embedded controller
frequency
systems.
modulator.
The
ASM3P2853A
reduces
electromagnetic interference (EMI) at the clock source.
The ASM3P2853A allows significant system cost savings
by reducing the number of circuit board layers and
Block Diagram
VDD
XIN
XOUT
Crystal
Oscillator
SSONB
PWDNB
PLL1
USB Clock
(48MHz
Unmodulated)
PLL2
50MHz
Modulated
VSS
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.
ASM3P2853A
November 2006
rev 1.3
Pin Configuration
8
50MHz
7
USB Clock
3
6
SSONB
4
5
PWDNB
XIN
1
XOUT
2
VDD
VSS
ASM3P2853A
Pin Description
Pin#
Pin
Name
Type
1
XIN
I
Description
Connection to crystal or external reference frequency input. This pin has dual
functions. It can be connected either to an external crystal or an external
reference clock.
Connection to crystal. If using an external reference clock, this pin must be left
2
XOUT
O
3
VDD
P
Power supply for the analog and digital blocks
4
VSS
P
Ground to entire chip.
5
PWDNB
I
6
SSONB
I
7
8
USB
Clock
50MHz
unconnected.
Power-down control pin. Pull low to enable the power-down mode. Connect to
VDD, if not used.
Digital logic input used to enable spread spectrum function (Active LOW).
Spread spectrum is enabled when LOW, disabled when HIGH.
O
Clock output -1 (48MHz unmodulated)
O
Clock output -2 (50MHz modulated)
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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ASM3P2853A
November 2006
rev 1.3
Absolute Maximum Ratings
Symbol
VDD, VIN
Parameter
Rating
Unit
Voltage on any pin with respect to Ground
-0.5 to +4.6
V
Storage temperature
-65 to +125
°C
TA
Operating temperature
-40 to +85
°C
Ts
Max. Soldering Temperature (10 sec)
260
°C
TJ
Junction Temperature
150
°C
TDV
Static Discharge Voltage (As per JEDEC STD22- A114-B)
2
KV
TSTG
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect
device reliability.
Operating Conditions
Parameter
Symbol
Supply Voltage
Condition / Description
VDD
Ambient Operating
2.5V ± 5%
TA
Temperature Range
Crystal Resonator Frequency
Output Driver Load Capacitance
Min
Typ
Max
2.375
2.5
2.625
-40
-
+85
FXIN
25
CL
-
-
Unit
V
°C
MHz
15
pF
Crystal Specifications
Fundamental AT cut parallel resonant crystal
Nominal frequency
25MHz
Frequency tolerance
± 50ppm or better at 25°C
Operating temperature range
-25°C to +85°C
Storage temperature
-40°C to +85°C
Load capacitance
18pF
Shunt capacitance
7pF maximum
ESR
25Ω
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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ASM3P2853A
November 2006
rev 1.3
DC Electrical Characteristics
Parameter
Symbol
Conditions / Description
Min
Typ
Max
Unit
IDD
VDD=2.5V, FXIN=25MHz, CL=15pF
7
13
20
mA
-
12
-
uA
Overall
Supply Current,
Dynamic
Supply Current,
Static
IDDL
VDD = 2.5V, XIN = 0, PWDNB =0
All input pins
High-Level Input
Voltage
Low-Level Input
Voltage
High-Level Input
Current
Low-Level Input
Current (pull-up)
VIH
VDD=2.5V
1.7
-
-
V
VIL
VDD=2.5V
-
-
0.7
V
IIH
-
-
25
µA
IIL
-
-
-25
µA
Clock Outputs
High-Level Output
Source Current
Low-Level Output
Sink Current
High-Level Output
Source Current
Low-Level Output
Sink Current
Output Impedance
IxOH
VDD= 2.5V ,V(XIN) = 0, VO=2V
-
-15
-
mA
IxOL
VDD= V(XIN) =2.5V, VO=0.4V
-
15
-
mA
IOH
VO=2V
-
8
-
mA
IOL
VO=0.4V
-
8
-
mA
-
42
-
Ω
ZO
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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ASM3P2853A
November 2006
rev 1.3
AC Electrical Characteristics
Parameter
Symbol
Rise Time*
tr
Fall Time*
tf
Conditions/ Description
Min
Typ
Max
Unit
-
2
-
nS
-
1.5
-
nS
tjc
-
250
-
pS
tp
-
175
-
pS
45
50
55
%
Measured from 20% to 80% of the
signal level
Measured from 80% to 20% of the
Jitter
(Cycle to Cycle)
Jitter
(Period)
signal level
Ratio of pulse width (as measured from
Clock Duty Cycle
td
rising edge to next falling edge at
VDD/2) to one clock period
* CL = 15 pF, Input clock frequency = 25MHz
Typical Application Schematic using ASM3P2853A Device
25MHz
fundamental
Crystal
1
XIN
2
XOUT
3
VDD
4
50MHz
8
Modulated 50MHz output
27pF
USB Clock
7
SSONB
6
VSS
PWDNB
ASM3P2853A
5
Un-modulated 48MHz output
27pF
+2.5V
0.1uF
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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ASM3P2853A
November 2006
rev 1.3
Package Information
8-Pin SOIC package
H
E
D
A2
A
C
A1
D
θ
e
L
B
Dimensions
Symbol
Inches
Min
Max
Millimeters
Min
Max
A1
0.004
0.010
0.10
0.25
A
0.053
0.069
1.35
1.75
A2
0.049
0.059
1.25
1.50
B
0.012
0.020
0.31
0.51
C
0.007
0.010
0.18
0.25
D
0.193 BSC
4.90 BSC
E
0.154 BSC
3.91 BSC
e
0.050 BSC
1.27 BSC
H
0.236 BSC
6.00 BSC
L
0.016
0.050
0.41
1.27
θ
0°
8°
0°
8°
Coplanarity < = 4 mil
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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ASM3P2853A
November 2006
rev 1.3
Ordering Codes
Part number
Marking
Package Configuration
Temperature Range
ASM3P2853AF-08ST
3P2853AF
8-pin SOIC ,TUBE, Pb Free
Commercial
ASM3P2853AF-08SR
3P2853AF
8-pin SOIC, TAPE & REEL, Pb Free
Commercial
ASM3P2853AG-08ST
3P2853AG
8-pin SOIC ,TUBE, Green
Commercial
ASM3P2853AG-08SR
3P2853AG
8-pin SOIC, TAPE & REEL, Green
Commercial
ASM3I2853AF-08ST
3I2853AF
8-pin SOIC ,TUBE, Pb Free
Industrial
ASM3I2853AF-08SR
3I2853AF
8-pin SOIC, TAPE & REEL, Pb Free
Industrial
ASM3I2853AG-08ST
3I2853AG
8-pin SOIC ,TUBE, Green
Industrial
ASM3I2853AG-08SR
3I2853AG
8-pin SOIC, TAPE & REEL, Green
Industrial
Device Ordering Information
A S M 3 P 2 8 5 3 A F - 0 8 S R
R = Tape & Reel, T = Tube or Tray
O = SOT
S = SOIC
T = TSSOP
A = SSOP
V = TVSOP
B = BGA
Q = QFN
U = MSOP
E = TQFP
L = LQFP
U = MSOP
P = PDIP
D = QSOP
X = SC-70
DEVICE PIN COUNT
F = LEAD FREE AND RoHS COMPLIANT PART
G = GREEN PACKAGE, LEAD FREE, and RoHS
PART NUMBER
X= Automotive
I= Industrial
P or n/c = Commercial
(-40C to +125C) (-40C to +85C)
(0C to +70C)
1 = Reserved
2 = Non PLL based
3 = EMI Reduction
4 = DDR support products
5 = STD Zero Delay Buffer
6 = Power Management
7 = Power Management
8 = Power Management
9 = Hi Performance
0 = Reserved
PulseCore Semiconductor Mixed Signal Product
Licensed under US patent #5,488,627, #6,646,463 and #5,631,920.
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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ASM3P2853A
November 2006
rev 1.3
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200
Campbell, CA 95008
Tel: 408-879-9077
Fax: 408-879-9018
www.pulsecoresemi.com
Copyright © PulseCore Semiconductor
All Rights Reserved
Preliminary Information
Part Number: ASM3P2853A
Document Version: v1.3
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003
© Copyright 2006 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or
registered trademarks of PulseCore Semiconductor. All other brand and product names may be the trademarks of their
respective companies. PulseCore reserves the right to make changes to this document and its products at any time without
notice. PulseCore assumes no responsibility for any errors that may appear in this document. The data contained herein
represents PulseCore’s best data and/or estimates at the time of issuance. PulseCore reserves the right to change or correct
this data at any time, without notice. If the product described herein is under development, significant changes to these
specifications are possible. The information in this product data sheet is intended to be general descriptive information for
potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or
customer. PulseCore does not assume any responsibility or liability arising out of the application or use of any product
described herein, and disclaims any express or implied warranties related to the sale and/or use of PulseCore products
including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual
property rights, except as express agreed to in PulseCore’s Terms and Conditions of Sale (which are available from
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The purchase of products from PulseCore does not convey a license under any patent rights, copyrights; mask works rights,
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for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result
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manufacturer assumes all risk of such use and agrees to indemnify PulseCore against all claims arising from such use.
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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