A product Line of
Diodes Incorporated
PI6LC48S0401
5 Output HiFlexTM Ethernet Network Clock Generator
Features
Description
ÎÎ3.3V & 2.5V supply voltage
The PI6LC48S0401 is an LC VCO based low phase noise design
intended for Ethernet applications. Typical 10GbE usage assumes
a 25MHz crystal input, while the PLL loop is used to generate the
156.25MHz and other Ethernet clock frequencies.
ÎÎCrystal/CMOS input: 25 MHz
ÎÎDifferential input: 25MHz, 125MHz, and 156.25 MHz
ÎÎOutput frequencies: 156.25, 125, 100, 50, 25MHz
For Ethernet applications other than 10GbE, programmable
dividers allow for outputs of 156.25, 125, 100, 50, and 25MHz.
This device offers both pin selection and I2C interface to give
more options to meet various system needs.
ÎÎ5 outputs with selectable output signaling: LVPECL or LVDS
ÎÎLow 0.3ps typical integrated phase noise design: 156.25MHz
(12kHz to 20MHz)
ÎÎPLL Bypass mode
ÎÎPower supply noise rejection: -52 dBc typical @ VDD
ÎÎPackaging (Pb-free & Green): 48 Contact 6×6mm TQFN
ÎÎIndustrial temperature support: -40C to 85C
Document Number DS40336 Rev 2-2
NC
GND
VDD
NC
NC
NC
GND
VDD
47
46
45
44
43
42
41
40
39
38
MODE0
NC
48
1
37
36
Q0+
IN_SEL
2
35
Q0-
IN+
3
34
Q1+
IN-
4
33
Q1-
VDD_OSC
5
32
VDDO
X_IN/CLK
6
31
Q2+
X_OUT
7
30
Q2-
PLL_BYPASS
8
29
Q3+
I2C_ADR_SEL
9
28
Q3-
VDDA
10
27
VDDO
INFREQ_SEL
11
26
Q4+
25
Q4-
GND
14
15
16
17
18
19
20
21
22
23
24
SDATA
NC
FS_Q
GND
VDD
NC
NC
VDD
MODE1
VDD
GND
12
13
SCLK
GND
PI6LC48S0401
NC
VDD
NC
Pin Configuration
1
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PI6LC48S0401
Block Diagram
PLL_BYPASS
X_IN/CLK
3
OSC
/M
X_OUT
PLL
/Divider
50/100/125/156.25
IN+
MODE0
Q[0:2]
2
MODE1
Q[3:4]
ININ_SEL
INFREQ_SEL
FS_Q
SCLK
SDATA
100MHz output frequency can be selected only in I2C mode
Pin Description
Pin Number Pin Name
Type
1, 18, 21, 23,
38, 43
VDD
Power
–
Core supply
2
IN_SEL
Input
CMOS
Input select between Xtal and differential input
3
IN+
Input
4
IN-
Input
LVPECL
Differential reference input, also accepts AC-coupled LVDS, CML, HCSL
or LVPECL. Differential inputs have an internal 100Ω cross resistor.
5
VDD_OSC
Power
-
Power supply for Xtal Oscillator circuit
6
X_IN/CLK
Input
Xtal or clock input, connect to a 25MHz Xtal or single-ended clock
7
X_OUT
Output
Xtal output
8
PLL_BYPASS
Input
CMOS
PLL bypass, provide input frequency to outputs
9
I2C_ADR_SEL Input
CMOS
I2C address selection.
10
VDDA
Power
–
Analog supply
11
INFREQ_SEL
Input
Tri-level
Input frequency selection for reference input
12, 17, 24,
39, 44
GND
Power
Connect to ground
15, 19, 20,
40, 41, 42,
45, 46, 47, 48
NC
-
No connect
PI6LC48S0401
Document Number DS40336 Rev 2-2
Description
2
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PI6LC48S0401
Pin Description (cont.)
Pin Number Pin Name
Type
Description
13
SCLK
Input
I2C clock input
14
SDATA
Input/
Output
I2C Data line
16
FS_Q
Input
Tri-level
Output frequency select
22
MODE1
Input
Tri-level
Q3 ~ Q4 output control
25, 26
Q4-, Q4+
Output
LVPECL/
Differential outputs
LVDS
27, 32
VDDO
Power
28, 29
Q3-, Q3+
Output
LVPECL/
Differential outputs
LVDS
30, 31
Q2-, Q2+
Output
LVPECL/
Differential outputs
LVDS
33, 34
Q1-, Q1+
Output
LVPECL/
Differential outputs
LVDS
35, 36
Q0-, Q0+
Output
LVPECL/
Differential outputs
LVDS
37
MODE0
Input
Tri-level
E-pad
GND
Power
PI6LC48S0401
Document Number DS40336 Rev 2-2
Power supply for differential outputs
Q0 ~ Q2 output control
Connect to ground, use thermal vias
3
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PI6LC48S0401
Reference Input Frequency Select Table
Input MUX Selection
IN_SEL
Input Source
INFREQ_SEL
Reference Input
0
Crystal Input (X_IN/CLK, X_OUT)
0
25MHz
1
Differential Input (IN+, IN-)
1
125MHz
NC
Crystal Input (X_IN/CLK, X_OUT)
NC
156.25MHz
PLL Bypass Control Function
PLL_BYPASS
PLL operation
0
PLL enabled
1
PLL bypassed
Differential Output Control
MODE0
Q[0:2]
MODE1
Q[3:4]
0
LVPECL
0
LVPECL
1
LVDS
1
LVDS
NC
Hi-Z
NC
Hi-Z
Output Frequency Control Table
FS_Q
Output Freq.
0
156.25MHz
1
125MHz
NC
50MHz
I2C Address Selection Table
I2C_ADR_SEL
I2C Address
0
DC (h)
1
DE (h)
PI6LC48S0401
Document Number DS40336 Rev 2-2
4
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PI6LC48S0401
Maximum Ratings
(Above which useful life may be impaired. For user guidelines, not tested.)
Storage Temperature........................................................... –65°C to +150°C
Supply Voltage to Ground Potential, VDD, VDDA VDDO .– 0.5V to +4.6V
ESD Protection (HBM) ...................................................................... 2000 V
Junction Temperature .................................................. 125 °C max
Note: Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at these
or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
reliability.
Operating Conditions
Symbol
Parameters
VDD
Core Power Supply Voltage
VDDO
Output Power Supply Voltage
VDDA
Analog Power Supply Voltage
IDD
Power Supply Current
IDDO
Conditions
Power Supply Current for Outputs
IDDA
Analog Power Supply Current
TA
Ambient Temperature
Min..
Typ.
Max.
Units
2.97
3.3
3.63
V
2.375
2.5
2.625
V
2.97
3.3
3.63
V
2.375
2.5
2.625
V
2.97
3.3
3.63
V
2.375
2.5
2.625
V
100
mA
All outputs loaded, Diff.
outputs are LVPECL
300
mA
All outputs loaded, Diff.
outputs are LVDS
130
mA
45
mA
85
°C
Max.
Units
–40
Input Electrical Characteristics
Symbol
Parameters
Rpu
Internal pull up resistance
51
KW
Rdn
Internal pull down resistance
51
KW
CXTAL
Internal capacitance on X_IN and
X_OUT pins
12
pF
PI6LC48S0401
Document Number DS40336 Rev 2-2
Conditions
5
Min.
Typ.
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PI6LC48S0401
LVCMOS DC Electrical Characteristics
Symbol
Parameters
Conditions
Min..
VIH
Input High Voltage
VDD = 3.3V ±10%
VIL
Input Low Voltage
IIH
Input High Current
VIN = VDD max.
IIL
Input Low Current
VIN = 0V
TDC
Input Duty Cycle
CIN
Input Capacitance
Typ.
Max.
Units
2
VDD +0.3
V
VDD = 2.5V ±5%
1.7
VDD +0.3
V
VDD = 3.3V ±10%
-0.3
0.8
V
VDD = 2.5V ±5%
-0.3
0.5
V
150
mA
µA
-150
35
65
%
3.5
pF
Differential Input DC Characteristics
Symbol
Parameters
Conditions
Min..
VIH
Input High Voltage
VIL
Input Low Voltage
VDD - 2.0
VCM
Input Bias Voltage
0.5
R IN
Input Differential Impedance1
80
VIN-PP
Input Differential Swing
Differential peak to peak
Typ.
Max.
Units
VDD - 0.7
V
V
100
0.3
VDD - 0.85
V
120
W
2.6
V
Note: 1. Differential input can be AC or DC coupled.
Crystal Characteristic
Parameters
Description
OSCmode
Mode of Oscillation
FREQ
Frequency
ESR
1
Min.
Typ
Max.
Units
Fundamental
10
25
Equivalent Series Resistance
40
MHz
50
W
Cload
Load Capacitance
18
pF
Cshunt
Shunt Capacitance
7
pF
Drive Level
250
uW
Note: 1. ESR value is dependent upon frequency of oscillation
PI6LC48S0401
Document Number DS40336 Rev 2-2
6
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PI6LC48S0401
LVPECL Output DC Characteristics
(1)
Symbol
Parameters
Condition
Min.
VOPP
Output peak-peak Voltage
Single-ended
VOH
Output High Voltage
VOL
Output Low Voltage
Outputs terminated with 50Ω to
VDDO - 2V
Typ.
Max.
Units
0.78
V
VDDO - 1.4
VDDO - 0.7
V
VDDO - 2.0
VDDO - 1.3
V
Max.
Units
0.454
V
50
mV
1.375
V
50
mV
LVDS Output DC Characteristics (1)
Symbol
Parameters
Condition
Min.
VOPP
Output Peak-peak Voltage
Single-ended
0.247
DVOPP
VOPP Magnitude Change
VOS
Output Offset Voltage
DVOS
VOS Magnitude Change
Typ.
1.125
AC Output Characteristics (see test configurations)
(1)
TA=-40C to 85C; V DD =3.3V+10%, V DDO =3.3V+10%
Symbol
Parameters
fOUT
Output Frequency
tR / tF
tDC
tjPHASE
Condition
Rise and Fall Time;
20% ~80%
Duty Cycle
Min..
Max.
Units
LVPECL
156.25
MHz
LVDS
156.25
MHz
400
ps
52
%
LVPECL, LVDS
250
LVPECL, LVDS
Integrated phase jitter (RMS)
Typ.
48
12kHz-20MHz @ 156.25MHz,
25MHz Xtal input
0.25
0.4
ps
10kHz-5MHz @ 25MHz, 25MHz
Xtal input
0.33
0.4
ps
tjc-c
Cycle to cycle jitter
28
30
ps
tjPk-Pk
Peak to Peak jitter
30
35
ps
fN
PI6LC48S0401
Single-Side Band Phase
Noise
Document Number DS40336 Rev 2-2
156.25MHz,
25MHz Xtal
input
Offset 1kHz
-117
Offset 10kHz
-130
Offset 100kHz
-134
Offset 1MHz
-139
Offset 10MHz
-154
7
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dBc/
Hz
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A product Line of
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PI6LC48S0401
AC Output Characteristics (continued)
TA=-40C to 85C; V DD =3.3V+10%, V DDO =3.3V+10%
Symbol
Parameters
Condition
Min..
Typ.
VDD, 50mVpp, 10k-1.5MHz
-52
VDDA, 50mVpp, 10k-1.5MHz
-65
VDDO, 50mVpp, 10k-1.5MHz
-50
Max.
Units
PSNR
Power Supply Noise Rejection
tSTARTUP
Start time
10
ms
tLOCK
PLL lock time
20
ms
dBc
Note:
1. VDDO = 3.3V is not valid with V DD = 2.5V
PI6LC48S0401
Document Number DS40336 Rev 2-2
8
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PI6LC48S0401
Serial Data Interface (I2C compatible)
PI6LC48S0401 is a slave only device that supports block read and block write protocol using a single 7-bit address and read/write bit
as shown below.
Read and write block transfers can be stopped after any complete byte transfer.
For full electrical I2C compliance, it is recommended to use external pull-up resistors for SDATA and SCLK. The internal
pull-up resistors have a size of 50kW typical.
Address Assignment
A6
A5
1
A4
1
0
A3
A2
1
1
A1
A0
R/W
1
I2C_ADR_SEL
1/0
How to Write
1 bit
7 bits
1 bit
1 bit
Start bit
Address
W(0)
Ack
8 bits
Data Byte
(D)
1 bit
Ack
8 bits
Data Byte
(D+1)
1 bit
Ack
8 bits
.......
Data Byte
(D+N)
1 bit
1 bit
Ack
Stop bit
1 bit
1 bit
Ack
Stop bit
How to Read
1 bit
7 bits
1 bit
1 bit
Start bit
Address
R(1)
Ack
8 bits
Data Byte
(D)
1 bit
Ack
8 bits
Data Byte
(D+1)
1 bit
Ack
8 bits
.....
Data Byte
(D+N)
Output Frequency I2C bit Control Table
FS_Q (2-bit) Output Freq.
00
156.25MHz
01
50MHz
10
125MHz
11
100MHz
PI6LC48S0401
Document Number DS40336 Rev 2-2
9
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PI6LC48S0401
Input Freq. I2C bit Control Table
INFREQ_SEL (2-bit)
Input Freq.
00
25MHz
01
156.25MHz
10
125MHz
11
100MHz
Byte 0: Output Frequency Selection Register
Type
Power Up
Condition
RW
0
RW
0
Vendor ID
RW
0
Vendor ID
RW
0
Bit
Control Function Description
7
Reserved
6
Reserved
5
FS_Q (1)
4
FS_Q (0)
3
Reserved
2
Reserved
1
0
Output divider
0
1
See FS_Q I2C control table
Byte 1: Output Frequency Selection and Misc. Register
Bit
Control Function Description
Type
Power Up
Condition
0
1
7
I2C pin control
Determine external pins or I2C control mode
RW
0
External pins
I 2C
6
I2C_ADR_SEL
Select I2C write address
RW
0
DC(h)
DE(h)
5
INFREQ_SEL (1)
RW
0
4
INFREQ_SEL (0)
RW
0
See INFREQ_SEL I2C control
table
3
Reserved
2
Reserved
1
Reserved
0
Reserved
PI6LC48S0401
Document Number DS40336 Rev 2-2
Input frequency selection
10
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PI6LC48S0401
Byte 2: Output Enable Selection
Type
Power Up
Condition
0
1
Output enable bit for Q4
RW
0
Enable
Disable
OE for Q3
Output enable bit for Q3
RW
0
Enable
Disable
3
OE for Q2
Output enable bit for Q2
RW
0
Enable
Disable
2
OE for Q1
Output enable bit for Q1
RW
0
Enable
Disable
1
OE for Q0
Output enable bit for Q0
RW
0
Enable
Disable
0
Reserved
Type
Power Up
Condition
0
1
Bit
Control Function Description
7
Reserved
6
Reserved
5
OE for Q4
4
Byte 3: Reserved
Byte 4: Output Type Selection
Bit
Control Function Description
7
Reserved
6
Reserved
5
Q4
Output Type Select Q4
RW
0
LVPECL
LVDS
4
Q3
Output Type Select Q3
RW
0
LVPECL
LVDS
3
Q2
Output Type Select Q2
RW
0
LVPECL
LVDS
2
Q1
Output Type Select Q1
RW
0
LVPECL
LVDS
1
Q0
Output Type Select Q0
RW
0
LVPECL
LVDS
0
Reserved
Type
Power Up
Condition
0
1
PLL bypass function
RW
0
PLL is enabled
PLL is bypassed
Input selection
RW
0
Crystal
Reference
Byte 5: Misc. Register
Bit
Control Function Description
7
Reserved
6
Reserved
5
Reserved
4
Reserved
3
PLL_BYPASS
2
Reserved
1
Reserved
0
IN_SEL
PI6LC48S0401
Document Number DS40336 Rev 2-2
11
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PI6LC48S0401
Phase Noise Plots
156.25MHz LVDS Clock
25MHz LVPECL Clock
PI6LC48S0401
Document Number DS40336 Rev 2-2
12
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PI6LC48S0401
LVPECL/LVDS Buffer
VDDO
Z o = 50
L = 0 ~ 10 in.
100
Z o = 50
150*
150*
* remove for LVDS
Figure 1. LVPECL and LVDS Test Circuit
3.3V ± 10%
2.5V ± 5%
VDDO
0.1µF
10Ω∗
VDDA
0.1µF
10µF
* The resistor value may be
different for 2.5V supply
Figure 2. Power Supply Filter
m
PI6LC48S0401
Document Number DS40336 Rev 2-2
13
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PI6LC48S0401
Crystal circuit connection
The following diagram shows PI6LC48S0401 crystal circuit connection with a parallel crystal. For the CL=18pF crystal, it is suggested to use C1=18pF, C2=18pF. C1 and C2 can be adjusted to fine tune to the target ppm of crystal oscillator according to different
board layouts.
Crystal Oscillator Circuit
X_IN
C1
18pF
SaRonix-eCera
FL2500047
Crystal�(CL�=�18pF)
X_OUT
C2
18pF
Crystal Circuit Oscillator
Recommended Crystal Specification
Pericom recommends:
a) FY2500081, SMD 5x3.2(4P), 25MHz, CL=18pF, +/-30ppm, http://www.pericom.com/pdf/datasheets/se/FY_F9.pdf
b) FL2500047, SMD 3.2x2.5(4P), 25MHz, CL=18pF, +/-20ppm, http://www.pericom.com/pdf/datasheets/se/FL.pdf
Part Marking
PI6LC48
S0401ZLIE
YYWWXX
YY : Year
WW : Workweek
1st X : Assembly Code
2nd X : Fab Code
Note:
1. For latest datecode info, please check: https://www.diodes.com/assets/MediaList-Attachments/Pericom-Datecode-Format-Explanation.pdf
PI6LC48S0401
Document Number DS40336 Rev 2-2
14
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PI6LC48S0401
Packaging Mechanical: 48-Contact TQFN (ZL)
15-0244
Note:
1. For latest package info, please check: https://www.diodes.com/design/support/packaging/pericom-packaging/
Ordering Information(1-3)
Ordering Code
Package Code
Package Description
Operating Temperature
PI6LC48S0401ZLIEX
ZL
48-Contact, Pb-free & Green (TQFN), Tape & Reel
Industrial
Notes:
1. Thermal characteristics can be found on the company web site at https://www.diodes.com/design/support/packaging/pericom-packaging/
2. E = Pb-free and Green
3. Adding an X suffix = Tape/Reel
PI6LC48S0401
Document Number DS40336 Rev 2-2
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PI6LC48S0401
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER
THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or
any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer
or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all
the companies whose products are represented on Diodes Incorporated website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes
Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal
injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein
may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval
of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably
expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge
and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated
products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by
Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes
Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2016, Diodes Incorporated
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