IDT 871002AGI-02

Differential-to-0.7V HCSL Differential
PCI EXPRESS™ Jitter Attenuator
ICS871002I-02
DATA SHEET
General Description
Features
The ICS871002I-02 is a high performance Jitter
Attenuator designed for use in PCI Express™systems.
HiPerClockS™
In some PCI Express systems, such as those found in
desktop PCs, the PCI Express clocks are generated
from a low bandwidth, high phase noise PLL frequency
synthesizer. In these systems, a jitter attenuator may be required to
attenuate high frequency random and deterministic jitter components
from the PLL synthesizer and from the system board. The
ICS871002I-02 has two PLL bandwidth modes: 350kHz and
2200kHz. The 350kHz mode provides the maximum jitter
attenuation, but it also results in higher PLL tracking time. In this
mode, the spread spectrum modulation may also be attenuated. The
2200kHz bandwidth provides the best tracking skew and will pass
most spread profiles, but the jitter attenuation will not be as good as
the lower bandwidth modes. The ICS871002I-02 can be set for
different modes using the F_SELx pins as shown in Table 3C.
•
•
•
Two 0.7V HCSL differential output pairs
•
•
•
•
•
Input frequency range: 98MHz to 128MHz
•
•
•
Full 3.3V supply mode
ICS
One differential clock input
CLK, nCLK can accept the following differential input levels:
LVPECL, LVDS, HSTL, HCSL, SSTL
Output frequency range: 98MHz to 640MHz
VCO range: 490MHz - 640MHz
Cycle-to-cycle jitter: 45ps (maximum)
Two bandwidth modes allow the system designer to make jitter
attenuation/tracking skew design trade-offs
-40°C to 85°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
The ICS871002I-02 uses IDT 3rd Generation FemtoClockTM PLL
technology to achieve the lowest possible phase noise. The
device is packaged in a small 20 Lead TSSOP package, making it
ideal for use in space constrained applications such as PCI Express
add-in cards.
PLL Bandwidth (typical) Table
BW_SEL
0 = PLL Bandwidth: ~350kHz (default)
1 = PLL Bandwidth: ~2200kHz
Block Diagram
IREF
OE Pullup
F_SEL[1:0] Pullup:Pulldown
2
Pin Assignment
nQ0
IREF
FB_OUT
nFB_OUT
MR
BW_SEL
F_SEL1
VDDA
F_SEL0
VDD
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Q0
VDD
Q1
nQ1
nFB_IN
FB_IN
GND
nCLK
CLK
OE
ICS871002I-02
BW_SEL Pulldown
0 = 350kHz
1 = 2200kHz
CLK Pulldown
Phase
Detector
nCLK Pullup
VCO
Output Divider
00 ÷5
01 ÷4
10 ÷2 (default)
11 ÷1
nQ0
490 - 640 MHz
Q1
nQ1
FB_IN Pulldown
nFB_IN Pullup
20-Lead TSSOP
6.5mm x 4.4mm x 0.925mm
package body
G Package
Top View
÷5 (fixed)
FB_OUT
nFB_OU
MR Pulldown
ICS871002AGI-02 REVISION A APRIL 14, 2010
Q0
1
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
Table 1. Pin Descriptions
Number
Name
1, 20
nQ0, nQ0
Output
Type
2
IREF
Input
3,
4
FB_OUT,
nFB_OUT
Output
Description
Differential output pair. HCSL interface levels.
A fixed precision resistor (475Ω) from this pin to ground provides a reference
current used for differential current-mode Qx/nQx clock outputs.
Differential feedback output pair. HCSL interface levels.
5
MR
Input
Pulldown
Active HIGH Master Reset. When logic HIGH, the internal dividers are reset
causing the true outputs (Qx, FB_OUT) to go low and the inverted outputs (nQx,
nFB_OUT) to go high. When logic LOW, the internal dividers and the outputs are
enabled. LVCMOS/LVTTL interface levels.
6
BW_SEL
Input
Pulldown
PLL Bandwidth select input. 0 = 350kHz, 1 = 2200kHz. See Table 3B.
7,
9
F_SEL1,
F_SEL0
Input
Pullup
Pulldown
Frequency select pins. See Table 3C. LVCMOS/LVTTL interface levels
8
VDDA
Power
Analog supply pin.
10, 19
VDD
Power
Core supply pins.
11
OE
Input
Pullup
12
CLK
Input
Pulldown
13
nCLK
Input
Pullup
14
GND
Power
15
FB_IN
Input
Pulldown
16
nFB_IN
Input
Pullup
17, 18
nQ1, Q1
Output
Output enable pin. When HIGH, the outputs are active. When LOW, the outputs are
in a high impedance state. LVCMOS/LVTTL interface levels. See Table 3A.
Non-inverting differential clock input.
Inverting differential clock input.
Power supply ground.
Non-inverting differential feedback clock input.
Inverting differential feedback clock input.
Differential output pair. HCSL 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
kΩ
RPULLDOWN
Input Pulldown Resistor
51
kΩ
ICS871002AGI-02 REVISION A APRIL 14, 2010
Test Conditions
2
Minimum
Typical
Maximum
Units
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
Function Tables
Table 3A. Output Enable Function Table
Input
Outputs
OE
Q[1:0], nQ[1:0]
FB_OUT, nFB_OUT
0
High-Impedance
Enabled
1 (default)
Enabled
Enabled
Table 3B. PLL Bandwidth Control Table
Input
BW_SEL
PLL Bandwidth
0
350kHz (default)
1
2200kHz
Table 3C. F_SELx Function Table
Inputs
Input Frequency
(MHz)
F_SEL1
F_SEL0
Divider
Output Frequency
(MHz)
100
0
0
÷5
100
100
0
1
÷4
125
100
1
0
÷2
250 (default)
100
1
1
÷1
500
ICS871002AGI-02 REVISION A APRIL 14, 2010
3
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
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 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, VO
-0.5V to VDD + 0.5V
Package Thermal Impedance, θJA
86.7°C/W (0 mps)
Storage Temperature, TSTG
-65°C to 150°C
DC Electrical Characteristics
Table 4A. LVDS Power Supply DC Characteristics, VDD = 3.3V ± 10%, TA = -40°C to 85°C
Symbol
Parameter
VDD
Core Supply Voltage
VDDA
Analog Supply Voltage
IDD
IDDA
Test Conditions
Minimum
Typical
Maximum
Units
2.97
3.3
3.63
V
VDD – 0.12
3.3
VDD
V
Power Supply Current
75
mA
Analog Supply Current
12
mA
Maximum
Units
Table 4B. LVCMOS/LVTTL DC Characteristics, VDD = 3.3V ± 10%, TA = -40°C to 85°C
Symbol
Parameter
Test Conditions
Minimum
Typical
VIH
Input High Voltage
2
VDD + 0.3
V
VIL
Input Low Voltage
-0.3
0.8
V
IIH
Input High Current
IIL
Input Low Current
OE, F_SEL1
VDD = VIN = 3.63V
5
µA
BW_SEL,
F_SEL0, MR
VDD = VIN = 3.63V
150
µA
OE, F_SEL1
VDD = 3.63V, VIN = 0V
-150
µA
BW_SEL,
F_SEL0, MR
VDD = 3.63V, VIN = 0V
-5
µA
Table 4C. Differential DC Characteristics, VDD = 3.3V ± 10%, 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
CLK, FB_IN
VDD = VIN = 3.465V
150
µA
nCLK, nFB_IN
VDD = VIN = 3.465V
5
µA
CLK, FB_IN
VDD = 3.465V, VIN = 0V
-5
µA
nCLK, nFB_IN
VDD = 3.465V, VIN = 0V
-150
µA
0.15
1.3
V
GND + 0.5
VDD – 0.85
V
NOTE 1: VIL should not be less than -0.3V.
NOTE 2: Common mode input voltage is defined as VIH.
ICS871002AGI-02 REVISION A APRIL 14, 2010
4
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
Table 5. 0.7V HCSL Differential AC Characteristics, VDD = 3.3V ± 10%, TA = -40°C to 85°C
Symbol
Parameter
Test Conditions
Minimum
98
Typical
Maximum
Units
640
MHz
45
ps
1150
mV
fMAX
Output Frequency
tjit(cc)
Cycle-to-Cycle Jitter; NOTE 1
VMAX
Absolute Max. Output Voltage;
NOTE 2, 3
VMIN
Absolute Min. Output Voltage;
NOTE 2, 4
-300
VRB
Ringback Voltage; NOTE 5, 6
-100
100
mV
VCROSS
Absolute Crossing Voltage;
NOTE 2, 7, 8
200
550
mV
∆VCROSS
Total Variation of VCROSS over
all edges; NOTE 2, 7, 9
140
mV
tR / tF
Output Rise/Fall Time
0.6
4.75
V/ns
odc
Output Duty Cycle; NOTE 10
48
52
%
PLL Mode
measured between -150mV to +150mV
mV
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: All parameters measured at f ≤ 250MHz unless noted otherwise.
NOTE 1: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 2: Measurement taken from single ended waveform.
NOTE 3: Defined as the maximum instantaneous voltage including overshoot. See Parameter Measurement Information Section.
NOTE 4: Defined as the minimum instantaneous voltage including undershoot. See Parameter Measurement Information Section.
NOTE 5: Measurement taken from differential waveform.
NOTE 6:TSTABLE is the time the differential clock must maintain a minimum ± 150mV differential voltage after rising/falling edges before it is
allowed to drop back into the VRB ±100mV differential range.
NOTE 7: Measured at crossing point where the instantaneous voltage value of the rising edge of Q equals the falling edge of nQ.
NOTE 8: Refers to the total variation from the lowest crossing point to the highest, regardless of which edge is crossing. Refers to all crossing
points for this measurement.
NOTE 9: Defined as the total variation of all crossing voltages of rising Q and falling nQ, This is the maximum allowed variance in Vcross for
any particular system.
NOTE 10: Input duty cycle must be 50%.
ICS871002AGI-02 REVISION A APRIL 14, 2010
5
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
Parameter Measurement Information
3.3V±10%
3.3V±10%
3.3V±10%
3.3V±10%
SCOPE
VDD
50Ω
33Ω
VDD
Measurement
Point
VDDA
VDDA
49.9Ω
IREF
HCSL
2pF
HCSL
50Ω
33Ω
50Ω
50Ω
Measurement
Point
IREF
GND
475Ω
GND
49.9Ω
2pF
475Ω
0V
0V
This load condition is used for IDD and tjit(cc) measurements.
3.3V HCSL Output Load AC Test Circuit
3.3V HCSL Output Load AC Test Circuit
VDD
nQ[0:1],
nFB_OUT
nCLK,
nFB_IN
Q[0:1],
➤
V
Cross Points
PP
CMR
CLK,
FB_IN
tcycle n
➤
V
FB_OUT
➤
tcycle n+1
➤
tjit(cc) = |tcycle n – tcycle n+1|
1000 Cycles
GND
Differential Input Level
Cycle-to-Cycle Jitter
TSTABLE
Clock Period (Differential)
Positive Duty
Cycle (Differential)
VRB
Negative Duty
Cycle (Differential)
+150mV
VRB = +100mV
0.0V
VRB = -100mV
-150mV
0.0V
Q - nQ
VRB
Q - nQ
TSTABLE
Differential Measurement Points for Duty Cycle/Period
ICS871002AGI-02 REVISION A APRIL 14, 2010
Differential Measurement Points for Ringback
6
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
Parameter Measurement Information, continued
VMAX = 1.15V
nQ
nQ
VCROSS_MAX = 550mV
VCROSS_DELTA = 140mV
VCROSS_MIN = 250mV
Q
VMIN = -0.30V
Q
Single-ended Measurement Points for Absolute Cross
Point and Swing
Rise Edge Rate
Single-ended Measurement Points for Delta Cross Point
Fall Edge Rate
+150mV
0.0V
-150mV
Q - nQ
Output Rise/Fall Time
ICS871002AGI-02 REVISION A APRIL 14, 2010
7
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
Application 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 ICS871002I-02 provides
separate power supplies to isolate any high switching noise from the
outputs to the internal PLL. VDD and VDDA 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 10Ω resistor along with a 10µF bypass capacitor be
connected to the VDDA pin.
3.3V
VDD
.01µF
10Ω
.01µF
10µF
VDDA
Figure 1. Power Supply Filtering
Wiring the Differential Input to Accept Single-Ended Levels
Figure 2 shows how a differential input can be wired to accept single
ended levels. The reference voltage VREF = 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 VREF in 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 VREF 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 50Ω applications, R3 and R4 can be 100Ω.
The 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. 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. Recommended Schematic for Wiring a Differential Input to Accept Single-ended Levels
ICS871002AGI-02 REVISION A APRIL 14, 2010
8
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
Differential Clock Input Interface
Please consult 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 HSTL drivers. If you are
using an HSTL driver from another vendor, use their termination
recommendation.
The CLK /nCLK accepts LVDS, LVPECL, HSTL, SSTL, HCSL and
other differential signals. The differential signal must meet the VPP
and VCMR input requirements. Figures 3A to 3F show interface
examples for the CLK/nCLK input driven by the most common driver
types. The input interfaces suggested here are examples only.
3.3V
3.3V
3.3V
1.8V
Zo = 50Ω
Zo = 50Ω
CLK
CLK
Zo = 50Ω
nCLK
Zo = 50Ω
nCLK
Differential
Input
HSTL
R1
50Ω
IDT
HSTL Driver
Differential
Input
LVPECL
R2
50Ω
R2
50Ω
R1
50Ω
R2
50Ω
3A. CLK/nCLK Input Driven by an
IDT Open Emitter HSTL Driver
Figure 3B. CLK/nCLK Input Driven by a
3.3V LVPECL Driver
3.3V
3.3V
3.3V
R3
125Ω
3.3V
R4
125Ω
3.3V
Zo = 50Ω
Zo = 50Ω
CLK
CLK
R1
100
Zo = 50Ω
nCLK
R1
84Ω
R2
84Ω
nCLK
Zo = 50Ω
Differential
Input
LVPECL
Receiver
LVDS
Figure 3C. CLK/nCLK Input Driven by a
3.3V LVPECL Driver
Figure 3D. CLK/nCLK Input Driven by a 3.3V LVDS Driver
3.3V
2.5V
3.3V
3.3V
2.5V
*R3
33Ω
R3
120Ω
Zo = 50Ω
R4
120Ω
Zo = 60Ω
CLK
CLK
Zo = 50Ω
Zo = 60Ω
nCLK
nCLK
HCSL
*R4
33Ω
R1
50Ω
R2
50Ω
Differential
Input
SSTL
R1
120Ω
R2
120Ω
Differential
Input
*Optional – R3 and R4 can be 0Ω
Figure 3F. CLK/nCLK Input Driven by a 2.5V SSTL Driver
Figure 3E. CLK/nCLK Input Driven by a
3.3V HCSL Driver
ICS871002AGI-02 REVISION A APRIL 14, 2010
9
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
Recommendations for Unused Input and Output Pins
Inputs:
Outputs:
LVCMOS Control Pins
Differential Outputs
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional protection.
A 1kΩ resistor can be used.
All unused differential outputs can be left floating. We recommend
that there is no trace attached. Both sides of the differential output
pair should either be left floating or terminated.
Recommended Termination
Figure 4A is the recommended termination for applications which
require the receiver and driver to be on a separate PCB. All traces
should be 50Ω impedance.
Figure 4A. Recommended Termination
Figure 4B is the recommended termination for applications which
require a point to point connection and contain the driver and receiver
on the same PCB. All traces should all be 50Ω impedance.
Figure 4B. Recommended Termination
ICS871002AGI-02 REVISION A APRIL 14, 2010
10
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
Schematic Layout
Figure 5 shows an example of ICS871002I-02 application schematic.
In this example, the device is operated at VDD= 3.3V. The decoupling
capacitors should be located as close as possible to the power pin.
The input is driven by a 3.3V LVPECL driver. Two examples of HCSL
termination are shown in this schematic.
Logic Control Input Examples
Set Logic
Input to
'1'
VDD
Set Logic
Input to
'0'
VDD
RU1
1K
RU2
Not Install
To Logic
Input
pins
RD1
Not Install
RD2
1K
To Logic
Input
pins
VDD=3.3V
R1
Q0
33
Zo = 50
R2
nQ0
33
Zo = 50
+
-
FB_IN
R3
475
nFB_IN
R7
50
VDD
R6
R8
50
VDDA
10
VDD
FB_IN
nFB_IN
MR
BW_SEL
F_SEL1
F_SEL0
C2
10u
C3
0.1u
R4
50
U1
VDD
1
2
3
4
5
6
7
8
9
10
nQ0
IREF
FB_OUT
nFB_OUT
MR
BW_SEL
F_SEL1
VDDA
F_SEL0
VDD
Q0
VDD
Q1
nQ1
nFB_IN
FB_IN
GND
nCLK
CLK
OE
20
19
18
17
16
15
14
13
12
11
R5
50
C1
.1uf
Recommended for
PCI Express Add-In
Card
FB_IN
nFB_IN
OE
HCSL Termination
C4
.1uf
Zo = 50 Ohm
CLK
Zo = 50 Ohm
LVPECL Driv er
Zo = 50
nQ1
Zo = 50
+
-
R9
50
nCLK
R11
50
Q1
R10
50
Recommended for PCI
Express Point-to-Point
Connection
R12
50
R13
50
Figure 5. ICS871002I-02 Schematic Layout
ICS871002AGI-02 REVISION A APRIL 14, 2010
11
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS871002I-02.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS71002I-02 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 + 10% = 3.63V, which gives worst case results.
•
Power (core)MAX = VDD_MAX * (IDD_MAX + IDDA_MAX) = 3.63V * (75mA + 12mA) = 315.81mW
•
Power (outputs)MAX = 46.8mW/Loaded Output Pair
If all outputs are loaded, the total power is 3 * 46.8mW = 140.4mW
Total Power_MAX (3.63V, with all outputs switching) = 315.81mW + 140.4mW = 456.21mW
•
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 = θJA * Pd_total + TA
Tj = Junction Temperature
θJA = 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 θJA must be used. Assuming no air flow and
a multi-layer board, the appropriate value is 86.7°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.456W * 86.7°C/W = 124.6°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 θJA for 20 Lead TSSOP, Forced Convection
θJA by Velocity
Meters per Second
Multi-Layer PCB, JEDEC Standard Test Boards
ICS871002AGI-02 REVISION A APRIL 14, 2010
0
1
2.5
86.7°C/W
82.4°C/W
80.2°C/W
12
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
The purpose of this section is to calculate power dissipation on the IC per HCSL output pair.
HCSL output driver circuit and termination are shown in Figure 6.
VDD
IOUT = 17mA
➤
VOUT
RREF =
475Ω ± 1%
RL
50Ω
IC
Figure 6. HCSL Driver Circuit and Termination
HCSL is a current steering output which sources a maximum of 17mA of current per output. To calculate worst case on-chip power dissipation,
use the following equations which assume a 50Ω load to ground.
The highest power dissipation occurs when VDD_MAX.
Power
= (VDD_MAX – VOUT) * IOUT,
since VOUT – IOUT * RL
= (VDD_MAX – IOUT * RL) * IOUT
= (3.6V – 17mA * 50Ω) * 17mA
Total Power Dissipation per output pair = 46.8mW
ICS871002AGI-02 REVISION A APRIL 14, 2010
13
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
Reliability Information
Table 7. θJA vs. Air Flow Table for a 20 Lead TSSOP
θJA by Velocity
Meters per Second
Multi-Layer PCB, JEDEC Standard Test Boards
0
1
2.5
86.7°C/W
82.4°C/W
80.2°C/W
Transistor Count
The transistor count for ICS871002I-02 is: 1,704
Package Outline and Package Dimensions
Package Outline - G Suffix for 20 Lead TSSOP
Table 8 Package Dimensions
All Dimensions in Millimeters
Symbol
Minimum
Maximum
N
20
A
1.20
A1
0.05
0.15
A2
0.80
1.05
b
0.19
0.30
c
0.09
0.20
D
6.40
6.60
E
6.40 Basic
E1
4.30
4.50
e
0.65 Basic
L
0.45
0.75
α
0°
8°
aaa
0.10
Reference Document: JEDEC Publication 95, MO-153
ICS871002AGI-02 REVISION A APRIL 14, 2010
14
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
PCI EXPRESS™ JITTER ATTENUATOR
Ordering Information
Table 9. Ordering Information
Part/Order Number
871002AGI-02
871002AGI-02T
871002AGI-02LF
871002AGI-02LFT
Marking
ICS71002AI02
ICS71002AI02
ICS1002AI02L
ICS1002AI02L
Package
20 Lead TSSOP
20 Lead TSSOP
“Lead-Free” 20 Lead TSSOP
“Lead-Free” 20 Lead TSSOP
Shipping Packaging
Tube
2500 Tape & Reel
Tube
2500 Tape & Reel
Temperature
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
NOTE: Parts that are ordered with an "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.
While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) assumes no responsibility for either its use or for the
infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal
commercial and industrial applications. Any other applications, such as those requiring high reliability or other extraordinary environmental requirements are not recommended without
additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support
devices or critical medical instruments.
ICS871002AGI-02 REVISION A APRIL 14, 2010
15
©2010 Integrated Device Technology, Inc.
ICS871002I-02 Data Sheet
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