Synchronous Ethernet Frequency
Translator
ICS840272I
DATA SHEET
General Description
Features
The ICS840272I is a PLL-based Frequency Translator intended for
use in Synchronous Ethernet applications. This high performance
device is optimized to generate 25MHz and 8kHz LVCMOS clock
outputs. The ICS840272I accepts the following differential or
single-ended input signals: 161.1328125MHz (10GbE Mode),
156.25MHz (1GbE Mode), or 125MHz (Recovered clock from
10/100/1000BaseT Ethernet PHY). The extended temperature
range supports telecommunication and networking end equipment
requirements.
•
Two single-ended outputs (LVCMOS or LVTTL levels),
output impedance: 17
•
•
•
Single-ended lock detect output (LVCMOS or LVTTL levels)
Pin Assignment
VDD
LOCK_DT
REF_SEL
SEL0
SEL1
OE
VDDA
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDDO
QA
QB
GND
CLK0
nCLK0
CLK1
nCLK1
Two selectable differential clock inputs
Differential input pair (CLKx, nCLKx) accepts LVPECL, LVDS,
LVHSTL, SSTL, HCSL input levels
•
Internal resistor bias on nCLK pin allows the user to drive CLK
input with external single-ended (LVCMOS/ LVTTL) input levels
•
Selectable input frequencies: 161.1328MHz, 156.25MHz or
125MHz
•
•
•
•
Output frequency: 25MHz, 8kHz
Full 3.3V supply voltage
-40°C to 85°C ambient operating temperature
Available in lead-free (RoHS 6) packaging
ICS840272I
16-Lead TSSOP
4.40mm x 5.0mm x 0.925mm package body
G Package
Top View
Block Diagram
LOCK_DT
CLK0
0
Pulldown
nCLK0 Pullup/Pulldown
0
P
CLK1 Pulldown
Pullup/Pulldown
N
PLL
QA
25MHz
1
1
nCLK1
QB
8kHz
REF_SEL Pulldown
M
Input Control
SEL[1:0] Pulldown:Pullup
00 = PLL Bypass, 25MHz Input
01 = 161.1328125MHz (default)
10 = 156.25MHz
11 = 125MHz
OE Pulldown
ICS840272I REVISION A 06/19/14
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©2014 Integrated Device Technology, Inc.
ICS840272I DATA SHEET
Pin Descriptions and Characteristics
Table 1. Pin Descriptions
Number
Name
Type
Description
1
VDD
Power
Core supply pin.
2
LOCK_DT
Output
Lock detect. Logic HIGH when PLL is locked.
3
REF_SEL
Input
Pulldown
4
SEL0
Input
Pullup
Selects the input reference frequency and the PLL bypass mode. See Table
3A. LVCMOS/LVTTL interface levels.
5
SEL1
Input
Pulldown
Selects the input reference frequency and the PLL bypass mode. See Table
3A. LVCMOS/LVTTL interface levels.
6
OE
Input
Pulldown
8kHz output enable pin. When LOW, QB is disabled. When HIGH, QB is
enabled. LVCMOS/LVTTL interface levels. See Table 3B.
7
VDDA
Power
Analog supply pin.
8
GND
Power
Power supply ground.
9
nCLK1
Input
Pullup/
Pulldown
Inverting differential clock input. Internal resistor bias to VDD/2.
10
CLK1
Input
Pulldown
Non-inverting differential clock input.
11
nCLK0
Input
Pullup/
Pulldown
Inverting differential clock input. Internal resistor bias to VDD/2.
12
CLK0
Input
Pulldown
Non-inverting differential clock input.
13
GND
Power
Power supply ground.
14
QB
Output
Single-ended clock output. LVCMOS/LVTTL interface levels.
15
QA
Output
Single-ended clock output. LVCMOS/LVTTL interface levels.
16
VDDO
Power
Output supply pin.
Selects the input reference clock. When LOW, selects CLK0, nCLK0.
When HIGH, selects CLK1, nCLK1. LVCMOS/LVTTL interface levels.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Symbol
Parameter
CIN
Input Capacitance
4
pF
RPULLUP
Input Pullup Resistor
51
k
RPULLDOWN
Input Pulldown Resistor
51
k
ROUT
Output Impedance
17
SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
Test Conditions
VDDO = 3.465V
2
Minimum
Typical
Maximum
Units
REVISION A 06/19/14
ICS840272I DATA SHEET
Function Tables
Table 3A. SEL[1:0] Function Table
Inputs
Function
Output (MHz)
SEL1
SEL0
CLKx, nCLKx (MHz)
Mode
QA
0
0
25
PLL Bypass
25
0 (default)
1 (default)
161.1328125
PLL Enabled
25
1
0
156.25
PLL Enabled
25
1
1
125
PLL Enabled
25
Table 3B. OE Function Table
Control Input
Function
OE
QB Output
0 (default)
Disabled (High impedance)
1
Enabled
REVISION A 06/19/14
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SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
ICS840272I DATA SHEET
Absolute Maximum Ratings
NOTE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress
specifications only. Functional operation of the product at these conditions or any conditions beyond those listed in the DC Characteristics or
AC Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
Item
Rating
Supply Voltage, VDD
4.6V
Inputs, VI
-0.5V to VDD + 0.5V
Outputs, IO (LVCMOS)
-0.5V to VDDO + 0.5V
Package Thermal Impedance, JA
81.2C/W (0 mps)
Storage Temperature, TSTG
-65C to 150C
DC Electrical Characteristics
Table 4A. Power Supply DC Characteristics, VDD = VDDO = 3.3V±5%, TA = -40°C to 85°C
Symbol
Parameter
VDD
Core Supply Voltage
VDDA
Test Conditions
Minimum
Typical
Maximum
Units
3.135
3.3
3.465
V
Analog Supply Voltage
VDD – 0.11
3.3
VDD
V
VDDO
Output Supply Voltage
3.135
3.3
3.465
V
IDD
Power Supply Current
57
mA
IDDA
Analog Supply Current
11
mA
IDDO
Output Supply Current
5
mA
Maximum
Units
Table 4B. LVCMOS/LVTTL DC Characteristics, VDD = VDDO = 3.3V±5%, TA = -40°C to 85°C
Symbol
Parameter
VIH
VIL
IIH
IIL
Test Conditions
Minimum
Input High Voltage
VDD = 3.465V
2
VDD + 0.3
V
Input Low Voltage
VDD = 3.465V
-0.3
0.8
V
Input High Current
Input Low Current
Typical
OE, SEL1,
REF_SEL
VDD = VIN = 3.465V
150
µA
SEL0
VDD = VIN = 3.465V
5
µA
OE, SEL1,
REF_SEL
VDD = 3.465V, VIN = 0V
-5
µA
SEL0
VDD = 3.465V, VIN = 0V
-150
µA
2.6
V
VOH
Output High Voltage
IOH = -12mA
VOL
Output Low Voltage
IOL = 12mA
SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
4
0.5
V
REVISION A 06/19/14
ICS840272I DATA SHEET
Table 4C. Differential DC Characteristics, VDD = VDDO = 3.3V±5%, TA = -40°C to 85°C
Symbol
Parameter
Test Conditions
IIH
Input High Current
IIL
Input Low Current
VPP
Peak-to-Peak Voltage; NOTE 1
VCMR
Common Mode Input Voltage;
NOTE 1, 2
Minimum
Typical
Maximum
Units
150
µA
CLK[0:1],
nCLK[0:1]
VDD = VIN = 3.465V
CLK[0:1]
VDD = 3.465V, VIN = 0V
-5
µA
nCLK[0:1]
VDD = 3.465V, VIN = 0V
-150
µA
0.15
1.3
V
GND + 0.5
VDD – 0.85
V
Maximum
Units
NOTE 1: VIL should not be less than -0.3V.
NOTE 2: Common mode input voltage is defined as VIH.
AC Electrical Characteristics
Table 5. AC Characteristics, VDD = VDDO = 3.3V±5%, TA = -40°C to 85°C
Symbol
Parameter
Test Conditions
fOUT
Output Frequency
tjit(Ø)
RMS Phase Jitter
(Random); NOTE 1
QA
25MHz, Integration Range:
12kHz – 10MHz
tjit(cc)
Cycle-to-Cycle Jitter
QA
25MHz
QA
20% to 80%
tR / tF
Output Rise/Fall Time
QB
20% to 80%
odc
Output Duty Cycle
Minimum
Typical
QA
25
MHz
QB
8
kHz
1.1
ps
37
ps
450
1100
ps
450
1100
ps
QA
47
53
%
QB
47
53
%
NOTE: Electrical parameters are guaranteed over the specified ambient operating temperature range, which is established when the device is
mounted in a test socket with maintained transverse airflow greater than 500 lfpm. The device will meet specifications after thermal equilibrium
has been reached under these conditions.
NOTE 1: Refer to Phase Noise plot.
REVISION A 06/19/14
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SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
ICS840272I DATA SHEET
Typical Phase Noise at 25MHz
Noise Power (dBc/Hz)
Additive Phase Jitter @ 25MHz
12kHz to 10MHz = 1.1ps (typical)
Offset Frequency (Hz)
SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
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REVISION A 06/19/14
ICS840272I DATA SHEET
Parameter Measurement Information
1.65V±5%
1.65V±5%
VDD
SCOPE
VDD,
VDDO
nCLK[0:1]
VDDA
Qx
V
V
Cross Points
PP
CMR
CLK[0:1]
GND
GND
-1.65V±5%
LVCMOS Output Load AC Test Circuit
Differential Input Level
V
DDO
2
QA, QB
80%
80%
t PW
t
PERIOD
20%
20%
QA, QB
odc =
t PW
tR
tF
x 100%
t PERIOD
Output Duty Cycle/Pulse Width/Period
Output Rise/Fall Time
V
V
DDORx
DDORx
2
tcycle n
➤
QA, QB
V
DDORx
2
➤
2
tcycle n+1
➤
➤
tjit(cc) = tcycle n – tcycle n+1
1000 Cycles
RMS Phase Jitter
REVISION A 06/19/14
Cycle-to-Cycle Jitter
7
SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
ICS840272I DATA SHEET
Applications Information
Power Supply Filtering Technique
As in any high speed analog circuitry, the power supply pins are
vulnerable to random noise. To achieve optimum jitter performance,
power supply isolation is required. The ICS840272I provides
separate power supplies to isolate any high switching noise from the
outputs to the internal PLL. VDD, VDDA and VDDO should be
individually connected to the power supply plane through vias, and
0.01µF bypass capacitors should be used for each pin. Figure 1
illustrates this for a generic VDD pin and also shows that VDDA
requires that an additional 10 resistor along with a 10F bypass
capacitor be connected to the VDDA pin.
3.3V
VDD
.01µF
10Ω
.01µF
10µF
VDDA
Figure 1. Power Supply Filtering
Recommendations for Unused Input and Output Pins
Inputs:
Outputs:
LVCMOS Control Pins
LVCMOS Outputs
All control pins have internal pullups or pulldowns; additional
resistance is not required but can be added for additional protection.
A 1k resistor can be used.
All unused LVCMOS output can be left floating. There should be no
trace attached.
CLK/nCLK Inputs
For applications not requiring the use of the differential input, both
CLK and nCLK can be left floating. Though not required, but for
additional protection, a 1k resistor can be tied from CLK to ground.
SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
8
REVISION A 06/19/14
ICS840272I DATA SHEET
Wiring the Differential Input to Accept Single-Ended Levels
values of the resistors can be increased to reduce the loading for
slower and weaker LVCMOS driver. When using single-ended
signaling, the noise rejection benefits of differential signaling are
reduced. Even though the differential input can handle full rail
LVCMOS signaling, it is recommended that the amplitude be
reduced. The datasheet specifies a lower differential amplitude,
however this only applies to differential signals. For single-ended
applications, the swing can be larger, however VIL cannot be less
than -0.3V and VIH cannot be more than VDD + 0.3V. Suggested edge
rate faster than 1V/ns. Though some of the recommended
components might not be used, the pads should be placed in the
layout. They can be utilized for debugging purposes. The datasheet
specifications are characterized and guaranteed by using a
differential signal.
Figure 2 shows how a differential input can be wired to accept single
ended levels. The reference voltage V1= VDD/2 is generated by the
bias resistors R1 and R2. The bypass capacitor (C1) is used to help
filter noise on the DC bias. This bias circuit should be located as close
to the input pin as possible. The ratio of R1 and R2 might need to be
adjusted to position the V1in the center of the input voltage swing. For
example, if the input clock swing is 2.5V and VDD = 3.3V, R1 and R2
value should be adjusted to set V1 at 1.25V. The values below are for
when both the single ended swing and VDD are at the same voltage.
This configuration requires that the sum of the output impedance of
the driver (Ro) and the series resistance (Rs) equals the transmission
line impedance. In addition, matched termination at the input will
attenuate the signal in half. This can be done in one of two ways.
First, R3 and R4 in parallel should equal the transmission line
impedance. For most 50 applications, R3 and R4 can be 100. The
Figure 2. Recommended Schematic for Wiring a Differential Input to Accept Single-ended Levels
REVISION A 06/19/14
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SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
ICS840272I DATA SHEET
Differential Clock Input Interface
with the vendor of the driver component to confirm the driver
termination requirements. For example, in Figure 3A, the input
termination applies for IDT open emitter LVHSTL drivers. If you are
using an LVHSTL driver from another vendor, use their termination
recommendation.
The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL and
other differential signals. Both signals must meet the VPP and VCMR
input requirements. Figure 3A to Figure 3F show interface examples
for the CLK/nCLK input driven by the most common driver types. The
input interfaces suggested here are examples only. Please consult
3.3V
1.8V
1.8V
R3
3.3KΩ
Zo = 50Ω
3.3V
3.3V
3.3V
R4
6.65KΩ
Zo = 50Ω
CLK
CLK
Zo = 50Ω
nCLK
Zo = 50Ω
nCLK
Differential
Input
LVHSTL
R1
50Ω
IDT
LVHSTL Driver
R2
50Ω
Differential
Input
LVPECL
R1
50Ω
R2
50Ω
R3
50Ω
Figure 3A. CLK/nCLK Input Driven by an
IDT Open Emitter LVHSTL Driver
3.3V
3.3V
127Ω
Figure 3D. CLK/nCLK Input Driven by a
3.3V LVPECL Driver
3.3V
3.3V
3.3V
Zo = 50Ω
120Ω
3.3V
R2
3.3KΩ
CLK
CLK
R1
100Ω
nCLK
82.5Ω
Receiver
LVDS
82.5Ω
R3
3.3KΩ
Figure 3B. CLK/nCLK Input Driven by a
3.3V LVPECL Driver
3.3V
nCLK
Zo = 50Ω
Differential
Input
LVPECL
Figure 3E. CLK/nCLK Input Driven by a
3.3V LVDS Driver
3.3V
2.5V
2.5V
3.3V
R5
3.3KΩ
R3
120Ω
3.3V
R4
113Ω
Zo = 60Ω
*R3
CLK
CLK
Zo = 60Ω
nCLK
nCLK
*R4
HCSL
SSTL
Differential
Input
R1
120Ω
Figure 3C. CLK/nCLK Input Driven by a
3.3V HCSL Driver
SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
R2
120Ω
Differential
Input
Figure 3F. CLK/nCLK Input Driven by a
2.5V SSTL Driver
10
REVISION A 06/19/14
ICS840272I DATA SHEET
Schematic Example
the placement of the filter components be on the device side of the
PCB as close to the power pins as possible. If space is limited, the 10
ohm VCCA resistor and the 0.1uf capacitor in each power pin filter
should be placed on the device side. The other components can be
on the opposite side of the PCB. Pull up and pull down resistors to
set configuration pins can all be placed on the pcb side opposite the
device side to free up device side area if necessary.
Figure 4 (next page) shows an example ICS840272I application
which focuses on functional connections and is not configuration
specific. Refer to the pin description and functional tables in the
datasheet to ensure that the logic control inputs are properly set for
the application.
The ICS840272I requires a variation on each of the standard LVDS
and LVPECL termination networks for the input clocks. These
variations introduce an input offset that ensures the LOCK_DT output
stays at a stable logic low value when the input clock is either stopped
or tri-stated. Notice in particular the nonstandard value of R4 in the
LVPECL termination and the addition of R11 and R12 in the LVDS
termination. Use these same terminations for AC coupling.
Power supply filter recommendations are a general guideline to be
used for reducing external noise from coupling into the devices. The
filter performance is designed for a wide range of noise frequencies.
This low-pass filter starts to attenuate noise at approximately 10 kHz.
If a specific frequency noise component is known, such as switching
power supplies frequencies, it is recommended that component
values be adjusted and if required, additional filtering be added.
Additionally, good general design practices for power plane voltage
stability suggests adding bulk capacitance in the local area of all
devices.
As with any high speed analog circuitry, the power supply pins are
vulnerable to random noise. To achieve optimum jitter performance,
power supply isolation is required. The ICS840272I provides
separate power supplies to isolate any high switching noise from
coupling into the internal PLL.
For additional layout recommendations and guidelines, contact
clocks@idt.com.
In order to achieve the best possible filtering, it is recommended that
REVISION A 06/19/14
11
SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
ICS840272I DATA SHEET
Figure 4. ICS840272I Schematic Example
SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
12
REVISION A 06/19/14
ICS840272I DATA SHEET
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS840272I.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS840272I is the sum of the core power plus the analog power plus the power dissipated in the load(s).
The following is the power dissipation for VDD = 3.3V + 5% = 3.465V, which gives worst case results.
•
Power (core)MAX = VDD_MAX * (IDD + IDDA+ IDDO) = 3.465V *(57mA + 11mA + 5mA) = 252.9mW
•
Output Impedance ROUT Power Dissipation due to Loading 50 to VDD/2
Output Current IOUT = VDD_MAX / [2 * (50 + ROUT)] = 3.465V / [2 * (50 + 17)] = 25.86mA
•
Total Power Dissipation on the ROUT per LVCMOS output
Power (ROUT) = ROUT * (IOUT)2 = 17 * (25.86mA)2 = 11.4mW per output
Total Power (ROUT) = 11.4mW * 2 = 22.8mW
Total Power Dissipation
•
Total Power
= Power (core)MAX + Total Power (ROUT)
= 252.9mW + 22.8mW
= 275.7mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad directly affects the reliability of the device. The
maximum recommended junction temperature is 125°C. Limiting the internal transistor junction temperature, Tj, to 125°C ensures that the bond
wire and bond pad temperature remains below 125°C.
The equation for Tj is as follows: Tj = JA * Pd_total + TA
Tj = Junction Temperature
JA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance JA must be used. Assuming no air flow and
a multi-layer board, the appropriate value is 81.2°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.276W *81.2°C/W = 107.4°C. This is below the limit of 125°C.
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow and the type of
board (multi-layer).
Table 6. Thermal Resistance JA for 16-Lead TSSOP, Forced Convection
JA by Velocity
Meters per Second
Multi-Layer PCB, JEDEC Standard Test Boards
REVISION A 06/19/14
0
1
2.5
81.2°C/W
73.9°C/W
70.2°C/W
13
SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
ICS840272I DATA SHEET
Reliability Information
Table 7. JA vs. Air Flow Table for a 16-Lead TSSOP
JA vs. Air Flow
Meters per Second
Multi-Layer PCB, JEDEC Standard Test Boards
0
1
2.5
81.2°C/W
73.9°C/W
70.2°C/W
Transistor Count
The transistor count for ICS840272I: 3326
Package Outline and Package Dimensions
Package Outline - G Suffix for 16-Lead TSSOP
Table 8. Package Dimensions for 16-Lead TSSOP
All Dimensions in Millimeters
Symbol
Minimum
N
Maximum
16
A
1.20
A1
0.05
0.15
A2
0.80
1.05
b
0.19
0.30
c
0.09
0.20
D
4.90
5.10
E
E1
6.40 Basic
4.30
e
4.50
0.65 Basic
L
0.45
0°
0.75
8°
aaa
0.10
Reference Document: JEDEC Publication 95, MO-153
SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
14
REVISION A 06/19/14
ICS840272I DATA SHEET
Ordering Information
Table 9. Ordering Information
Part/Order Number
Marking
Package
Shipping Packaging
Temperature
840272AGILF
40272AIL
“Lead-Free” 16-Lead TSSOP
Tube
-40C to 85C
840272AGILFT
40272AIL
“Lead-Free” 16-Lead TSSOP
Tape & Reel
-40C to 85C
REVISION A 06/19/14
15
SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
ICS840272I DATA SHEET
Revision History Sheet
Rev
A
Table
Page
Description of Change
10
11-12
Updated Differential Clock Input Interface drawings.
Updated schematic and schematic text.
SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR
Date
16
6/19/2014
REVISION A 06/19/14
Corporate Headquarters
Sales
Tech Support
6024 Silver Creek Valley Road
San Jose, CA 95138 USA
1-800-345-7015 or 408-284-8200
Fax: 408-284-2775
www.IDT.com
email: clocks@idt.com
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(Rev.1.0 Mar 2020)
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