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May 2008  
rev 0.2  
ASM3P2187A/B  
Spread Spectrum Clock Generator for Mobile Applications  
Features  
Product Description  
• Generates a 4X EMI optimized clock signal at the  
The ASM3P2187A/B is a versatile spread spectrum  
frequency modulator designed specifically for a wide  
range of clock frequencies. The ASM3P2187A/B reduces  
electromagnetic interference (EMI) at the clock source,  
allowing system wide reduction of EMI of all clock  
dependent signals. The ASM3P2187A/B allows  
significant system cost savings by reducing the number of  
circuit board layers ferrite beads, shielding that are  
traditionally required to pass EMI regulations.  
Output.  
• Input frequency : 12.5MHz to 20MHz  
• Output frequency : 50MHz to 80MHz  
• SSON/PDB option  
• Selectable Centre Spread :  
± 0.5%, ± 1.0%  
• Low power CMOS design  
• Supply Voltage : 3.3V ± 0.3V  
•
Industrial Temperature range  
ASM3P2187A device has an option of Spread ON/OFF  
and ASM3P2187B device has Powerdown option  
• 8-pin TSSOP Package  
• Drop-in replacement for MB88155-412 Device  
Application  
The ASM3P2187A/B is targeted towards mobile phones,  
mobile audio players and PDAs.  
Block Diagram  
VDD  
SEL SSON/PDB  
PLL  
Modulation  
CLKIN/XIN  
XOUT  
Frequency  
Divider  
Crystal  
Oscillator  
ModOUT  
Output  
Loop  
Filter  
Phase  
Detector  
VCO  
Divider  
Feedback  
Divider  
REFOUT  
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.  
May 2008  
rev 0.2  
ASM3P2187A/B  
Pin Configurations  
VDD  
8
7
CLKIN/ XIN  
XOUT  
1
2
3
4
ModOUT  
ASM3P2187A  
SSON  
6
5
VSS  
SEL  
REFOUT  
VDD  
CLKIN/ XIN  
XOUT  
PDB  
8
7
6
5
1
2
3
4
ModOUT  
VSS  
ASM3P2187B  
SEL  
REFOUT  
Pin Description  
Pin#  
Pin Name  
Type  
Description  
1
CLKIN/XIN  
I
External reference Clock input or Crystal connection.  
Crystal connection. If using an external reference, this pin must be left  
unconnected.  
2
3
XOUT  
O
I
SSON / PDB*  
Modulation enable pin/ Power down pin. Has an Internal pull up resistor  
Modulation rate setting pin  
Centre spread, SEL = “L” : Frequency Deviation ± 0.5%  
Centre spread, SEL = “H” : Frequency Deviation ± 1.0%  
Has an Internal pull up resistor.  
4
SEL  
I
Non-modulated clock output pin. The Frequency is same as input  
frequency. This pin becomes to “L” at power-down.  
5
6
7
8
REFOUT  
VSS  
O
P
O
P
Ground Connection. Connect to system ground.  
Modulated clock output pin  
This pin becomes to“L” at power-down.  
ModOUT  
VDD  
Power Supply Voltage Pin. Connect to +3.3V.  
* SSON Pin is available in ASM3P2187A Device and PDB Pin is available in ASM3P2187B Device  
Spread Spectrum Clock Generator for Mobile Applications  
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Notice: The information in this document is subject to change without notice.  
May 2008  
rev 0.2  
ASM3P2187A/B  
Modulation Enable Setting Table  
SSON  
Modulation  
No Modulation  
Modulation  
L
H
Power down Status Table  
PDB  
Status  
L
Power Down Status  
Operating Status  
H
Spread Range Selection Table  
SEL  
Deviation @ 15MHz  
L
± 0.50%  
H
± 1.00%  
Absolute Maximum Ratings  
Symbol  
Parameter  
Rating  
-0.5 to +4.6  
VSS-0.5 to VDD+0.5  
VSS-0.5 to VDD+0.5  
-55 to +125  
260  
Unit  
V
VDD  
VIN  
Supply Voltage pin with respect to Ground  
Input Voltage pin with respect to Ground  
Output Voltage pin with respect to Ground  
Storage temperature  
V
VOUT  
TSTG  
Ts  
V
°C  
°C  
°C  
Max. Soldering Temperature (10 sec)  
Junction Temperature  
TJ  
150  
Static Discharge Voltage  
TDV  
2
KV  
(As per JEDEC STD22- A114-B)  
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.  
Spread Spectrum Clock Generator for Mobile Applications  
3 of 9  
Notice: The information in this document is subject to change without notice.  
May 2008  
rev 0.2  
ASM3P2187A/B  
DC Electrical Characteristics  
Symbol  
Parameter  
Min  
VSS – 0.3  
2.0  
Typ  
Max  
0.8  
Unit  
V
VIL  
VIH  
IIL  
Input low voltage  
Input high voltage  
Input low current  
Input high current  
VDD+ 0.3  
-50  
V
µA  
µA  
IIH  
+50  
For ModOUT, IOL = 4mA  
For REFOUT, IOL = 3mA  
For ModOUT, IOH = -4mA  
For REFOUT, IOH = -3mA  
VOL  
VOH  
Output low voltage  
Output high voltage  
VSS  
2.4  
0.4  
V
V
VDD  
ICC  
IDD  
Dynamic supply current (Unloaded Outputs)  
17  
8
mA  
mA  
V
Static supply current standby mode  
(CLKIN/XIN pulled LOW)  
VDD  
Operating voltage  
3.3  
3.3  
3.6  
5
tON  
ZOUT  
CIN  
Power up time (first locked clock cycle after power up)  
Clock output impedance  
2
mS  
Ω
50  
Input Capacitance  
7
pF  
pF  
CL  
Load Capacitance  
15  
AC Electrical Characteristics  
Symbol  
Parameter  
Min  
Typ  
Max  
20  
Unit  
CLKIN/XIN  
Input Clock frequency  
12.5  
12.5  
50  
15  
15  
MHz  
REFOUT  
ModOUT  
20  
Output Clock  
frequency  
CLKOUT  
MHz  
60  
80  
MF  
tLH*  
tHL*  
tJC  
Modulation Frequency  
32.4  
39  
52  
KHz  
nS  
Output rise time ( Measured from 20% to 80% )  
Output fall time ( Measured from 80% to 20% )  
Cycle to Cycle Jitter  
2
2.5  
2
1.5  
±250  
±150  
50  
nS  
±325  
±200  
55  
pS  
%
tJp  
Period Jitter (REFOUT)  
tD  
Output duty cycle  
45  
*tLH and tHL are measured with a capacitive load of 15pF  
Spread Spectrum Clock Generator for Mobile Applications  
4 of 9  
Notice: The information in this document is subject to change without notice.  
May 2008  
rev 0.2  
ASM3P2187A/B  
Output Clock Duty Cycle tD = (tb / ta )  
ta  
tb  
VDD/2  
ModOUT,  
REFOUT  
Cycle –to- Cycle Jitter (tJC = [tn -tn + 1])  
ModOUT  
tn  
tn+1  
Note: Cycle-cycle jitter indicates the difference between a certain cycle and the immediately  
succeeding (or preceding) cycle  
Spread Spectrum Clock Generator for Mobile Applications  
5 of 9  
Notice: The information in this document is subject to change without notice.  
May 2008  
rev 0.2  
ASM3P2187A/B  
Typical Crystal Oscillator Circuit  
R1 = 510ꢀ  
C1 = 27 pF  
C2 =27 pF  
Typical Crystal Specifications  
Fundamental AT cut parallel resonant crystal  
Nominal frequency  
14.31818MHz  
± 50 ppm or better at 25°C  
-25°C to +85°C  
-40°C to +85°C  
18pF  
Frequency tolerance  
Operating temperature range  
Storage temperature  
Load capacitance  
Shunt capacitance  
7pF maximum  
25ꢀ  
ESR  
Spread Spectrum Clock Generator for Mobile Applications  
6 of 9  
Notice: The information in this document is subject to change without notice.  
May 2008  
rev 0.2  
ASM3P2187A/B  
Package Information  
Mechanical Package Outline 8-Pin TSSOP  
H
E
D
A2  
A
C
θ
e
A1  
L
B
Dimensions  
Symbol  
Inches  
Millimeters  
Min  
Max  
Min  
Max  
A
A1  
A2  
B
0.043  
1.10  
0.002  
0.033  
0.008  
0.004  
0.114  
0.169  
0.006  
0.037  
0.012  
0.008  
0.122  
0.177  
0.05  
0.85  
0.19  
0.09  
2.90  
4.30  
0.15  
0.95  
0.30  
0.20  
3.10  
4.50  
c
D
E
e
0.026 BSC  
0.252 BSC  
0.65 BSC  
6.40 BSC  
H
L
0.020  
0°  
0.028  
8°  
0.50  
0°  
0.70  
8°  
θ
Note: Controlling dimensions are millimeters  
TSSOP – 0.034 grams unit weight  
Spread Spectrum Clock Generator for Mobile Applications  
7 of 9  
Notice: The information in this document is subject to change without notice.  
May 2008  
rev 0.2  
ASM3P2187A/B  
Ordering Code  
Part Number  
Marking  
3P2187AG  
3P2187AG  
3I2187AG  
3I2187AG  
3P2187BG  
3P2187BG  
3I2187BG  
3I2187BG  
Package Type  
Temperature  
Commercial  
Commercial  
Industrial  
ASM3P2187AG-08TT  
ASM3P2187AG-08TR  
ASM3I2187AG-08TT  
ASM3I2187AG-08TR  
ASM3P2187BG-08TT  
ASM3P2187BG-08TR  
ASM3I2187BG-08TT  
ASM3I2187BG-08TR  
8-Pin TSSOP, TUBE, Green  
8-Pin TSSOP, TAPE & REEL, Green  
8-Pin TSSOP, TUBE, Green  
8-Pin TSSOP, TAPE & REEL, Green  
8-Pin TSSOP, TUBE, Green  
Industrial  
Commercial  
Commercial  
Industrial  
8-Pin TSSOP, TAPE & REEL, Green  
8-Pin TSSOP, TUBE, Green  
8-Pin TSSOP, TAPE & REEL, Green  
Industrial  
Device Ordering Information  
A S M 3 P 2 1 8 7 A G - 0 8 T R  
R = Tape & Reel, T = Tube or Tray  
O = SOT  
U = MSOP  
E = TQFP  
L = LQFP  
U = MSOP  
P = PDIP  
S = SOIC  
T = TSSOP  
A = SSOP  
V = TVSOP  
B = BGA  
D = QSOP  
X = SC-70  
Q = QFN  
DEVICE PIN COUNT  
F = LEAD FREE AND RoHS COMPLIANT PART  
G = GREEN PACKAGE, LEAD FREE, and RoHS  
PART NUMBER  
X= Automotive  
(-40C to +125C) (-40C to +85C)  
I= Industrial  
P or n/c = Commercial  
(0C to +70C)  
1 = Clock Generator  
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 U.S Patent Nos 5,488,627 and 5,631,921  
Spread Spectrum Clock Generator for Mobile Applications  
8 of 9  
Notice: The information in this document is subject to change without notice.  
May 2008  
rev 0.2  
ASM3P2187A/B  
PulseCore Semiconductor Corporation  
1715 S. Bascom Ave Suite 200  
Campbell, CA 95008  
Tel: 408-879-9077  
Fax: 408-879-9018  
Copyright © PulseCore Semiconductor  
All Rights Reserved  
Part Number: ASM3P2187A/B  
Document Version: 0.2  
www.pulsecoresemi.com  
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003  
Many PulseCore Semiconductor products are protected by issued patents or by applications for patent  
© 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 PulseCore). All sales of PulseCore products are made exclusively  
according to PulseCore’s Terms and Conditions of Sale. The purchase of products from PulseCore does not convey a license under any  
patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of PulseCore or third parties. PulseCore  
does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be  
expected to result in significant injury to the user, and the inclusion of PulseCore products in such life-supporting systems implies that the  
manufacturer assumes all risk of such use and agrees to indemnify PulseCore against all claims arising from such use.  
Spread Spectrum Clock Generator for Mobile Applications  
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Notice: The information in this document is subject to change without notice.