SM802109
ClockWorks™ PCI-e Quad 100MHz
Ultra-Low Jitter, HCSL
Frequency Synthesizer
General Description
The SM802109 is a member of the ClockWorks
™
family of
devices from Micrel and provides an extremely low-noise
timing solution for PCI-Express clock signals. It is based
on a unique patented RotaryWave
®
architecture that
provides very-low phase noise.
The device operates from a 3.3V or 2.5V power supply
and synthesizes four HCSL output clocks at 100MHz. The
SM802109 accepts a 25MHz crystal or LVCMOS
reference clock.
Data sheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com
.
Features
•
Generates four HCSL clock outputs at 100MHz
•
2.5V or 3.3V operating range
•
Typical phase jitter @ 100MHz
(1.875MHz to 20MHz): 105fs
•
Industrial temperature range (–40°C to +85°C)
•
Green, RoHS, and PFOS compliant
•
Available in 24-pin 4mm
×
4mm QFN package
Applications
•
PCI-Express
Block Diagram
ClockWorks is a trademark of Micrel, Inc
RotaryWave is a registered trademark of Multigig, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
September 2011
M9999-092911-B
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SM802109
Ordering Information
(1)
Part Number
SM802109UMG
SM802109UMGTR
Note:
1. Devices are Green, RoHS, and PFOS compliant.
Marking
802109
802109
Shipping
Tube
Tape and Reel
Temperature Range
–40°C to +85°C
–40°C to +85°C
Package
24-Pin QFN
24-Pin QFN
Pin Configuration
24-Pin QFN
(Top View)
Pin Description
Pin Number
16, 17
20, 21
23, 24
3, 4
1
2
Pin Name
/Q0, Q0
/Q1, Q1
/Q2, Q2
/Q3, Q3
VDDO2
VSSO2
Pin Type
O, (DIF)
O, (DIF)
PWR
PWR
Pin Level
HCSL
HCSL
Pin Function
Differential Clock Outputs from Bank 1 100MHz
Differential Clock Outputs from Bank 2 100MHz
Power Supply for Output Bank 2
Power Supply Ground for Output Bank 2
PLL Bypass, Selects Output Source
5
PLL_BYPASS
I, (SE)
LVCMOS
0 = Normal PLL Operation
1 = Output from Input Reference Clock or Crystal
45KΩ pulldown
6
XTAL_SEL
I, (SE)
LVCMOS
Selects PLL Input Reference Source
0 = REF_IN, 1 = XTAL, 45KΩ pullup
September 2011
2
M9999-092911-B
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SM802109
Pin Description (Continued)
Pin Number
7, 12, 15, 19
8
13, 14
18
22
9
10
11
Pin Name
TEST
VDD
VSS
(Exposed Pad)
VDDO1
VSSO1
REF_IN
XTAL_IN
XTAL_OUT
PWR
PWR
PWR
PWR
I, (SE)
I, (SE)
O, (SE)
LVCMOS
Crystal
Crystal
Pin Type
Pin Level
Pin Function
Factory Test pins, Do not connect anything to these
pins.
Core Power Supply
Core Power Supply Ground. The exposed pad must
be connected to the VSS ground plane.
Power Supply for Output Bank 1
Power Supply Ground for Output Bank 1
Reference Clock Input
Crystal Reference Input, no load caps needed (see
Figure 5).
Crystal Reference Output, no load caps needed (see
Figure 5).
Truth Table
PLL_BYPASS
0
1
−
−
XTAL_SEL
−
−
0
1
INPUT
−
−
REF_IN
XTAL
OUTPUT
PLL
XTAL/REF_IN
−
−
September 2011
3
M9999-092911-B
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SM802109
Absolute Maximum Ratings
(1)
Supply Voltage (V
DD
, V
DDO1/2
) ......................................+4.6V
Input Voltage (V
IN
) ..............................
−0.50V
to V
DD
+ 0.5V
Lead Temperature (soldering, 20s)............................ 260°C
Case Temperature ..................................................... 115°C
Storage Temperature (T
s
) .........................
−65°C
to
+150°C
Operating Ratings
(2)
Supply Voltage (V
DD
, V
DDO1/2
)............... +2.375V to +3.465V
Ambient Temperature (T
A
).......................... –40°C to +85°C
Junction Thermal Resistance
(3)
QFN (θ
JA
)
Still-Air......................................................... 50°C/W
QFN (ψ
JB
)
Junction-to-Board ....................................... 30°C/W
DC Electrical Characteristics
(4)
V
DD
= V
DDO1/2
= 3.3V
±5%
or 2.5V
±5
%
V
DD
= 3.3V
±5%,
V
DDO1/2
= 3.3V
±5%
or 2.5V
±5%
T
A
=
−40°C
to
+85°C.
Symbol
V
DD
, V
DDO1/2
V
DD
, V
DDO1/2
I
DD
REF_IN
I
DD
XTAL
Parameter
2.5V Operating Voltage
3.3V Operating Voltage
Supply current V
DD
+ V
DDO
XTAL_SEL = 0
Outputs 50Ω to V
SS
XTAL_SEL = 1
Outputs 50Ω to V
SS
Condition
Min.
2.375
3.135
Typ.
2.5
3.3
140
Max.
2.625
3.465
175
Units
V
V
mA
Supply current V
DD
+ V
DDO
150
185
mA
HCSL DC Electrical Characteristics
(4)
V
DD
= V
DDO1/2
= 3.3V
±
5% or 2.5V
±
5%
V
DD
= 3.3V
±5%,
V
DDO1/2
= 3.3V
±5%
or 2.5V
±5%
T
A
=
−40°C
to
+85°C.
R
L
= 50Ω to V
SS
Symbol
Parameter
Condition
Min
660
-150
250
Typ.
700
0
350
Max.
850
27
550
Units
mV
mV
mV
V
OH
V
OL
V
CROSS
Notes:
1.
Output High Voltage
Output Low Voltage
Crossing Point Voltage
Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied
at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
Package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB.
The circuit is designed to meet the AC and DC specifications shown in the above table(s) after thermal equilibrium has been established.
2.
3.
4.
September 2011
4
M9999-092911-B
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SM802109
LVCMOS (PLL_BYPASS, XTAL_SEL) DC Electrical Characteristics
(4)
V
DD
= 3.3V
±5%,
or 2.5V
±5%
, T
A
=
−
40°C to
+85°C.
Symbol
V
IH
V
IL
I
IH
I
IL
Parameter
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
V
DD
= V
IN
= 3.465V
V
DD
= 3.465V, V
IN
= 0V
−150
Condition
Min.
2
−0.3
Typ.
Max.
V
DD
+ 0.3
0.8
150
Units
V
V
μA
μA
REF_IN DC Electrical Characteristics
(4)
V
DD
= 3.3V
±5%,
or 2.5V
±
5%, T
A
=
−40°C
to
+85°C.
Symbol
V
IH
V
IL
I
IN
Parameter
Input High Voltage
Input Low Voltage
Input Current
XTAL_SEL = V
IL
, V
IN
= 0V to V
DD
XTAL_SEL = V
IH
, V
IN
= V
DD
Condition
Min.
1.1
−0.3
−
5
20
Typ.
Max.
V
DD
+ 0.3
0.6
5
Units
V
V
μA
µA
Crystal Characteristics
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitor, C0
Correlation Drive Level
Condition
10pF to 12pF Load
Min.
Typ.
25
1
10
50
5
100
Max.
Units
MHz
Ω
pF
Fundamental, Parallel Resonant
µ
W
September 2011
5
M9999-092911-B
hbwhelp@micrel.com
or (408) 955-1690
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