PLL PLL702-05SC-R

PLL702-05
Low EMI Peripheral Clock Generator for Notebook
FEATURES
•
•
•
•
•
•
Single Low EMI IC to replace multiple crystals and
oscillators on Notebooks (27MHz, 14.318MHz,
24.576MHz, 25MHz).
Selectable crystal input: 24.576MHz or 14.318MHz
(accuracy requirement +/- 20ppm)
Less than 10ppm Frequency Synthesis error, meeting
AC97, IEEE1394, IEEE802 frequency precision
specification.
27MHz clock with 2 levels of Selectable Spread
Spectrum modulation +/- 0.5% and +/- 0.75% center.
25MHz clock with double drive strength (Ethernet PHY
and MAC).
24.576MHz clocks for Audio Codec and IEEE1394.
Available in 8-Pin SOIC.
XIN
1
XOUT
2
VSS
3
24.576MHz/SST0* T
4
8
VDD
7
27_14.318MHz/XTAL_SEL* v
6
VSS
5
25MHzx2
Note: 25MHzx2: double drive strength
v: Internal pull-down resistor (120kΩ)
*: Bi-directional pin
Tri-level input
T:
POWER GROUPS
•
Table 1. SPREAD SPECTRUM SELECTION
PLL702-05
•
PIN ASSIGNMENT
VDD – VSS: XIN, XOUT, analog core, digital part ,
27MHz., 24.576MHz and 25MHz.
SST0
SST Modulation only on
27MHz. (pin 7)
1
+/- 0.75 %
0
+/- 0.5 %
Crystal Input
XTAL_SEL
Pin 7
M
SST OFF (Default)
24.576MHz
0
27MHz
14.318MHz
1
14.318MHz
Table 2. CRYSTAL SELECTION TABLE
Notes: M = Do not connect. 1 = Pulled up. 0 = Pulled down.
BLOCK DIAGRAM
XTAL_SEL
SST(0)
XIN
XOUT
XTAL
OSC
PLL
SST
27_14.318MHz
24.576MHz
PLL2
25MHz
Note : Only 27MHz output is modulated for low EMI via Spread
Spectrum.
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
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Rev 08/12/04 Page 1
PLL702-05
Low EMI Peripheral Clock Generator for Notebook
PIN DESCRIPTIONS
Name
Pin#
Type
XIN
1
I
XOUT
VSS
2
3,6
O
P
24.576MHz/SST0
4
B
25MHzx2
5
O
27_14.318MHz/XTAL_SEL
7
B
VDD
8
P
Description
Crystal input: accepts either 24.576MHz or 14.31818MHz fundamental crystal (CL =
20pF, parallel resonant mode, +/-20ppm). On-chip load capacitors: no external load
capacitors required. (See the table #4 )
Crystal output.
Ground connection.
Bi-directional and Tri-Level pin. Upon power-on, the value of SST0 is latched in and
used to select the SST control (see Spread Spectrum selection table 1). Tri level input:
M = Do not connect, 1 = Pull up, 0 = Pull down. After power-up this pin acts as
24.576MHz output clock.
25MHz Ethernet output clock (double drive strength).
Bi-directional pin. Upon power-on, the value of XTAL_SEL is latched in and used to set
the input crystal frequency (24.575MHz or 14.31818MHz). Set XTAL_SEL to 0 (default)
for 24.576MHz input crystal, set XTAL_SEL to 1 for 14.31818MHz input crystal (see
Crystal Selection Table on page 1). . After power-up this pin acts as 27MHz output
(with 24.576MHz crystal) or as 14.31818MHz pass through clock (with 14.31818MHz
crystal), depending on the input crystal.
The 27MHz output can be modulated for low EMI using Spread Spectrum.
3.3V power supply for 27MHz, oscillator, analog core and digital circuitry.
FUNCTIONAL DESCRIPTION
Tri-level and two-level inputs
In order to reduce pin usage, the PLL702-05 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
The PLL702-05 also uses bi-directional pins. The same 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", since the pin also needs to serve as output. In the case of two level input pins, an internal pullup 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 bidirectional 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
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
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Rev 08/12/04 Page 2
PLL702-05
Low EMI Peripheral Clock Generator for Notebook
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: BI-DIRECTIONAL PINS WITH INTERNAL PULL-DOWN
Vcc
Jumper
options
Bi-directional pin
Output
EN
Clock
Load
Tri-Level pin
Power Up
RB
Reset
Latched
Input
RDOWN/4
R
Rdown
Jumper
options
Latch
Internal to chip
External Circuitry
NOTE: Rdn=Internal pull-down resistor (see pin description). Power-up Reset : R starts from 1 to 0 while RB starts from 0 to 1.
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 08/12/04 Page 3
PLL702-05
Low EMI Peripheral Clock Generator for Notebook
Electrical Specifications
1. Absolute Maximum Ratings
PARAMETERS
SYMBOL
Supply Voltage
Input Voltage, dc
Output Voltage, dc
Storage Temperature
Ambient Operating Temperature*
Junction Temperature
Lead Temperature (soldering, 10s)
ESD Protection, Human Body Model
MIN.
V DD
VI
VO
TS
TA
TJ
-0.5
-0.5
-65
-40
MAX.
UNITS
4.6
V DD +0.5
V DD +0.5
150
85
125
260
2
V
V
V
°C
°C
°C
°C
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
Input Frequency (to be set via XTAL_SEL)
CONDITIONS
MIN.
+/- 20ppm accuracy
TYP.
MAX.
UNITS
14.31818
MHz
24.576
MHz
Output Rise Time
10% to 90% with no load
0.5
ns
Output Fall Time
90% to 10% with no load
0.5
ns
Duty Cycle
At VDD/2
60
%
Max. Absolute Period Jitter
Long term, No SST
500
ps
Max. Jitter, cycle to cycle
Long term + Short term
400
ps
25
ms
Clock Settle Time
Crystal Load Capacitance
40
50
22
Excluding PCB parasitics
21
Crystal ESR
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
pF
30
www.phaselink.com
Ω
Rev 08/12/04 Page 4
PLL702-05
Low EMI Peripheral Clock Generator for Notebook
3. DC Specifications
PARAMETERS
SYMBOL
CONDITIONS
MIN.
Operating Voltage
V DD
Nominal voltage 3.3V
2.97
Input High Voltage
V IH
V DD /2
Input Low Voltage
V IL
V DD /2
Input High Voltage
V IH
For all Tri-level input
Input Low Voltage
V IL
For all Tri-level input
Input High Voltage
V IH
For all normal input
Input Low Voltage
V IL
For all normal input
Output High Voltage
V OH
Output Low Voltage
V OL
Output High Voltage At
CMOS Level
V OH
Nominal Output Current
I OUT
Operating Supply Current
I DD
Short-circuit Current
IS
I OH = -10mA (normal drive)
I OH = -20mA (double drive)
TYP.
UNITS
3.63
V
V
V DD /2 - 1
V DD -0.5
0.5
2
2.4
0.4
V DD -0.4
Double drive strength
20
No Load
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
V
V
I OL = -20mA (double drive)
10
V
V
0.8
Normal drive strength
V
V
I OL = 10mA (normal drive)
I OH = -8mA
MAX.
V
V
mA
23
mA
±100
mA
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Rev 08/12/04 Page 5
PLL702-05
Low EMI Peripheral Clock Generator for Notebook
PACKAGE INFORMATION
8 PIN Narrow SOIC ( mm )
SOIC
Symbol
Min.
Max.
A
A1
B
C
D
E
H
L
e
1.55
0.10
0.33
0.19
4.80
3.81
5.08
0.41
1.73
0.25
0.48
0.25
4.98
3.99
6.20
0.89
1.27 BSC
E
H
D
A
A
1
C
L
e
B
ORDERING INFORMATION
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
PLL702-05 S C
PART NUMBER
TEMPERATURE
C=COMMERCIAL
PACKAGE TYPE
S = SOIC
Order Number
PLL702-05SC-R
PLL702-05SC
Marking
P702-05SC
P702-05SC
Package Option
SOIC -Tape and Reel
SOIC –Tube
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.
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 08/12/04 Page 6