PLL650-05
Low EMI Network LAN Clock
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 09/03/04 Page 1
FEATURES
Full CMOS output swing with 40-mA output drive
capability. 25-mA output drive at TTL level.
Advanced, low power, sub-micron CMOS processes.
25MHz fundamental crystal or clock input.
3 fixed outputs of 25MHz, 75Mhz and 125Mhz with
output disable
SDRAM selectable frequencies of 105, 83.3, 140MHz
(Double Drive Strength).
Spread spectrum technology selectable for EMI
reduction from
0.5%, 0.75% center for SDRAM and
CPU.
Zero PPM synthesis error in all clocks.
Ideal for Network switches.
3.3V operation.
Available in 16-Pin 150mil SOIC
.
DESCRIPTION
The PLL650-05 is a low cost, low jitter, high
performance clock synthesizer. With PhaseLink's
proprietary analog Phase Locked Loop techniques, this
device can produce multiple clock outputs from a 25.0MHz
crystal or reference clock. This makes the PLL650-05 an
excellent choice for systems requiring clocking for network
chips, PCI devices, SDRAM, and ASICs.
PIN CONFIGURATION
FREQUENCY TABLE
FS1 FS0
SDRAMX2
0 0
Tristate
0 1
140MHz
SST
1 0
83.3MHz
SST
1 1
105MHz
SST
BLOCK DIAGRAM
XTAL
OSC
125MHz
(can be disabled)
XIN
XOUT
SDRAM (105, 83.3, 140MHz)
75 MHz
(can be disabled)
Control
Logic
FS (0:1)
1
1
1
25MHz
1
PLL 650-05
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
VDD
VDD
25MHz/FS0*^
GND
GND
SDRAMx2
VDD
SS0
T
XIN
XOUT/ENB_125M*^
GND
VDD
125MHz
GND
75MHz/FS1*^
ENB_75MHz^
Note: SDRAMx2: Double Drive strength.
T
: Tri-Level input ^: Internal pull-up
resistor *: Bi-directional pin (input value is latched upon power-up).
PLL650-05
Low EMI Network LAN Clock
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 09/03/04 Page 2
PIN DESCRIPTIONS
Name Number
Type
Description
XIN
1
I
25MHz fundamental crystal input (20pF C
L
parallel resonant).
XOUT/ENB_125M 2 B
Crystal output. At power-up, this pin latches ENB_125M (output enable
selector for 125MHz output. Disabled when ENB_125M is logical zero. Has
120k
internal pull up resistor.
125MHz 5
O
125MHz
output.
75MHz/FS1 7 B
75MHz output. This pin latch FS1 value at power-up. It has 60k
internal
pull up resistors.
ENB_75M 8 I
Output enable for 75Mhz output when high. Disabled when ENB_75M is
logical low. It has 60K
internal pull up resistor.
SS0 9
I
This pin is a tri-level input pin to control the spread spectrum function. See
Spread Spectrum Selection Table
SDRAMx2
11
O
SDRAM outputs with double drive strength determined by FS(0:1) value.
25MHz/FS0 14 B
25MHz (reference) output. This pin latch FS0 value at power-up. It has 60k
internal pull up resistors.
VDD 4,10,15,16
P
Power
supply.
GND 3,6,12,13
P
Ground.
SPREAD SPECTRUM SELECTION TABLE
SS0 SST
0
0.75% Center
M OFF
1
0.5% Center
FUNCTIONAL DESCRIPTION
Selectable spread spectrum and output frequencies
The PLL650-05 provides selectable spread spectrum modulation and selectable output frequencies. Selection is made by
connecting specific pins to a logical "zero" or "one", or by leaving them not connected (tri-level inputs or internal pull-up)
according to the frequency and spread spectrum selection tables shown on pages 1 and 2 respectively.
In order to reduce pin usage, the PLL650-05 uses tri-level input pins. These pins allow 3 levels for input selection: namely, 0
(Connect to GND), 1 (Connect to VDD), M (Do not connect). Thus, unlike the two-level selection pins, the tri-level input pins are
in the "M" (mid) state when not connected. In order to connect a tri-level pin to a logical "zero", the pin must be connected to
GND. Likewise, in order to connect to a logical "one" the pin must be connected to VDD.
Connecting a bi-directional pin
A bi-directional pin serves as input upon power-up, and as output as soon as the inputs have been latched. The value of the
input is latched-in upon power-up. Depending on the pin (see pin description), the input can be tri-level or a standard two-level.
Unlike unidirectional pins, bi-directional pins cannot be connected directly to GND or VDD in order to set the input to "0" or "1",
PLL650-05
Low EMI Network LAN Clock
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 09/03/04 Page 3
since the pin also needs to serve as output. In the case of two level input pins, an internal pull-up resistor is present. This allows
a default value to be set when no external pull down resistor is connected between the pin and GND (by definition, a tri-level
input has a the default value of "M" (mid) if it is not connected). In order to connect a bi-directional pin to a non-default value, the
input must be connected to GND or VDD through an external pull-down/pull-up resistor. Note: when the output load presents a
low impedance in comparison to the internal pull-up resistor, the internal pull-up resistor may not be sufficient to pull the input up
to a logical "one", and an external pull-up resistor may be required.
For bi-directional inputs, the external loading resistor between the pin and GND has to be sufficiently small (compared to the
internal pull-up resistor) so that the pin voltage be pulled below 0.8V (logical "zero"). In order to avoid loading effects when the
pin serves as output, the value of the external pull-down resistor should however be kept as large as possible. In general, it is
recommended to use an external resistor of around one sixth to one quarter of the internal pull-up resistor (see Application
Diagram). Note: when the output is used to drive a load presenting an small resistance between the output pin and VDD, this
resistance is in essence connected in parallel to the internal pull-up resistor. In such a case, the external pull-down resistor may
have to be dimensioned smaller to guarantee that the pin voltage will be low enough achieve the desired logical "zero". This is
particularly true when driving 74FXX TTL components.
APPLICATION DIAGRAM
Latch
Power Up
Reset
Jumper options
R
UP
/
4
Clock Load
Latched
Input
Output
EN
VDD
R
up
Bi-directional pin
R
RB
NOTE: Rup=120k
for 50MHz_OE (Pin2); Rup=60k for FS(0:1). R starts from 1 to 0 while RB starts from 0 to 1.
Internal to chip
External Circuitry
PLL650-05
Low EMI Network LAN Clock
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 09/03/04 Page 4
Electrical Specifications
1. Absolute Maximum Ratings
PARAMETERS SYMBOL
MIN.
MAX.
UNITS
Supply Voltage
V
DD
4.6 V
Input Voltage, dc
V
I
-0.5
V
DD
+0.5 V
Output Voltage, dc
V
O
-0.5
V
DD
+0.5 V
Storage Temperature
T
S
-65 150
C
Ambient Operating Temperature*
T
A
-40 85
C
Junction Temperature
T
J
125
C
Lead Temperature (soldering, 10s)
260
C
ESD Protection, Human Body Model
2
kV
Exposure of the device under conditions beyond the limits specified by Maximum Ratings for extended periods may cause permanent damage to the device
and affect product reliability. These conditions represent a stress rating only, and functional operations of the device at these or any other conditions above
the operational limits noted in this specification is not implied.
* Note: Operating Temperature is guaranteed by design for all parts (COMMERCIAL and INDUSTRIAL), but tested for COMMERCIAL grade only.
2. AC Specifications
PARAMETERS
CONDITIONS
MIN. TYP. MAX.
UNITS
Input Frequency
10
25
27
MHz
Output Rise Time
0.8V to 2.0V with no load
1.5
ns
Output Fall Time
2.0V to 0.8V with no load
1.5
ns
Duty Cycle*
@ 50% V
DD
45
50
55
%
Max. Absolute Jitter
Short term
150
ps
Max. Jitter, cycle to cycle
80
ps
* : in case SDRAM output is selected to be 83.3MHz, the duty cycle of output pin 22 will be 40%-60% if its output frequency is selected to be 105MHz
(FS2=1). In all other situations, pin 22 will also have a 50%-50% typical duty cycle.
PLL650-05
Low EMI Network LAN Clock
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 09/03/04 Page 5
3. DC Specification
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX.
UNITS
Operating Voltage
V
DD
2.97
3.63
V
Input High Voltage
V
IH
V
DD
/2
V
Input Low Voltage
V
IL
V
DD
/2
V
DD
/2 - 1
V
Input High Voltage
V
IH
For all Tri-level input
V
DD
-0.5
V
Input Low Voltage
V
IL
For all Tri-level input
0.5
V
Input High Voltage
V
IH
For all normal input
2
V
Input Low Voltage
V
IL
For all normal input
0.8
V
Output High Voltage
V
OH
I
OH
= -25mA
2.4
V
Output Low Voltage
V
OL
I
OL
= 25mA
0.4
V
Output High Voltage At
CMOS Level
V
OH
I
OH
= -8mA
V
DD
-0.4
V
Operating Supply Current
I
DD
No Load
35
mA
Short-circuit Current
I
S
50
mA
Nominal output current*
I
out
CMOS
output
level
35
40
mA
Nominal output current*
I
out
TTL output level
20
25
mA
Internal pull-up resistor
R
up
Pins 5,7
60
k
Internal pull-up resistor
R
up
Pin 2
120
k
*: SDRAM output strengths are doubled (i.e. min. CMOS level is 70mA, typ. CMOS level is 80mA)
PLL650-05
Low EMI Network LAN Clock
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 09/03/04 Page 6
PACKAGE INFORMATION
ORDERING INFORMATION
PhaseLink Corporation, reserves the right to make changes in its products or specifications, or both at any time without notice. The information
furnished by Phaselink is believed to be accurate and reliable. However, PhaseLink makes no guarantee or warranty concerning the accuracy of said
information and shall not be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon this product.
LIFE SUPPORT POLICY: PhaseLink's products are not authorized for use as critical components in life support devices or systems without the
express written approval of the President of PhaseLink Corporation.
For part ordering, please contact our Sales Department:
47745 Fremont Blvd., Fremont, CA 94538, USA
Tel: (510) 492-0990 Fax: (510) 492-0991
PART NUMBER
The order number for this device is a combination of the following:
Device number, Package type and Operating temperature range
PLL650-05 S C
Order Number
Marking
Package Option
PLL650-05SC-R
P650-05SC
SOIC - Tape and Reel
PLL650-05SC
P650-05SC
SOIC - Tube
PART NUMBER
TEMPERATURE
C=COMMERCIAL
I=INDUSTRAL
PACKAGE TYPE
S=SOIC
C
L
A
16 PIN Narrow SOIC ( mm )
SOIC
Symbol
Min.
Max.
A
1.35
1.75
A1
0.10
0.25
B
0.33
0.51
C
0.19
0.25
D
9.80
10.00
E
3.80
4.00
H
5.80
6.20
L
0.40
1.27
e
1.27 BSC
E
H
D
A1
e
B
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