ICST ICS840004AGIT Femtoclocksâ ¢ crystal-to lvcmos/lvttl frequency synthesizer Datasheet

PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840004I
FEMTOCLOCKS™CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
FEATURES
The ICS840004I is a 4 output LVCMOS/LVTTL
Synthesizer optimized to generate Fibre Channel
HiPerClockS™ reference clock frequencies and is a member of
the HiPerClocksTM family of high performance
clock solutions from ICS. Using a 26.5625MHz,
18pF parallel resonant crystal, the following frequencies can be
generated based on the 2 frequency select pins (F_SEL1:0):
212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, and
53.125MHz. The ICS840004I uses ICS’ 3rd generation low phase
noise VCO technology and can achieve 1ps or lower typical
random rms phase jitter, easily meeting Fibre Channel jitter
requirements. The ICS840004I is packaged in a small 20-pin
TSSOP package.
• Four LVCMOS/LVTTL outputs, 15Ω typical output impedance
ICS
• Selectable crystal oscillator interface
or LVCMOS single-ended input
• Supports the following input frequencies: 212.5MHz,
159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz
• RMS phase jitter @ 212.5MHz(2.55MHz - 20MHz):
0.49ps (typical)
• Output supply modes:
Core/Output
3.3V/3.3V
3.3V/2.5V
2.5V/2.5V
• -40°C to 85°C ambient operating temperature
FREQUENCY SELECT FUNCTION TABLE
Input Frequency
(MHz)
26.5625
F_SEL1
0
Inputs
M Divider
F_SEL0
Value
0
24
N Divider
Value
3
M/N Ratio
Value
8
Output Frequency
Range (MHz)
212.5
26.5625
0
1
24
4
6
159.375
26.5625
1
0
24
6
4
106.25
26.5625
1
1
24
12
2
53.125
26.04166
0
1
24
4
6
156.25
BLOCK DIAGRAM
OE
PIN ASSIGNMENT
Pullup
2
F_SEL1:0 Pullup:Pullup
nPLL_SEL Pulldown
nXTAL_SEL
Pulldown
XTAL_IN 26.5625MHz
OSC
F_SEL1:0
0
1
00
01
10
11
XTAL_OUT
TEST_CLK Pulldown
1
Phase
Detector
VCO
0
N
÷3
÷4
÷6
÷12 (default)
Q0
Q1
MR
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
F_SEL1
GND
Q0
Q1
VDDO
Q2
Q3
GND
XTAL_IN
XTAL_OUT
ICS840004I
20-Lead TSSOP
Q2
M = ÷24 (fixed)
F_SEL0
nc
nXTAL_SEL
TEST_CLK
OE
MR
nPLL_SEL
VDDA
nc
VDD
Q3
6.5mm x 4.4mm x 0.92mm
package body
G Package
Top View
Pulldown
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
840004AGI
www.icst.com/products/hiperclocks.html
1
REV. A JUNE 28, 2005
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840004I
FEMTOCLOCKS™CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
TABLE 1. PIN DESCRIPTIONS
Number
2, 9
Name
F_SEL0,
F_SEL1
nc
Unused
3
nXTAL_SEL
Input
Pulldown
4
TEST_CLK
Input
Pulldown
5
OE
Input
Pullup
6
MR
Input
Pulldown
7
nPLL_SEL
Input
Pulldown
8
VDDA
Power
10
11,
12
13, 19
14, 15
17, 18
16
VDD
XTAL_OUT,
XTAL_IN
GND
Q3, Q2,
Q1, Q0
VDDO
Power
1, 20
Type
Input
Description
Pullup
Input
Power
Output
Power
Frequency select pin. LVCMOS/LVTTL interface levels.
No connect.
Selects between the crystal or TEST_CLK inputs as the PLL reference
source. When HIGH, selects TEST_CLK. When LOW, selects XTAL
inpus. LVCMOS/LVTTL interface levels.
Single-ended LVCMOS/LVTTL clock input.
Output enable pin. When HIGH, the outputs are active. When LOW, the
outputs are in a high impedance state. LVCMOS/LVTTL interface levels.
Active HIGH Master Reset. When logic HIGH, the internal dividers are
reset causing the otuputs to go low. When logic LOW, the internal
dividers and the outputs are enabled. LVCMOS/LVTTL interface levels.
PLL Bypass. When LOW, the output is driven from the VCO output.
When HIGH, the PLL is bypassed and the output frequency =
reference clock frequency/N output divider.
LVCMOS/LVTTL interface levels.
Analog supply pin.
Core supply pin.
Crystal oscillator interface. XTAL_OUT is the output.
XTAL_IN is the input.
Power supply ground.
Single-ended clock outputs. LVCMOS/LVTTL interface levels.
15Ω typical output impedence.
Output supply pin.
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
Test Conditions
Minimum
Typical
Maximum
Units
4
pF
VDD, VDDA, VDDO = 3.465V
TBD
pF
VDD, VDDA = 3.465V, VDDO = 2.625V
TBD
pF
VDD, VDDA, VDDO = 2.625V
TBD
pF
51
kΩ
CPD
Power Dissipation Capacitance
RPULLUP
Input Pullup Resistor
RPULLDOWN
Input Pulldown Resistor
51
kΩ
ROUT
Output Impedance
15
Ω
840004AGI
www.icst.com/products/hiperclocks.html
2
REV. A JUNE 28, 2005
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840004I
FEMTOCLOCKS™CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VDD
4.6V
Inputs, VI
-0.5V to VDD + 0.5 V
Outputs, VO
-0.5V to VDD + 0.5V
Package Thermal Impedance, θJA
73.2°C/W (0 lfpm)
Storage Temperature, TSTG
-65°C to 150°C
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.
TABLE 3A. POWER SUPPLY DC CHARACTERISTICS, VDDD = VDDA = 3.3V±5%, VDDO = 3.3V±5% OR 2.5V±5%, TA = -40°C TO 85°C
Symbol
VDD
Parameter
Core Supply Voltage
Test Conditions
Minimum
3.135
Typical
3.3
Maximum
3.465
Units
V
VDDA
Analog Supply Voltage
3.135
3.3
3.465
V
VDDO
Output Supply Voltage
3.135
3.3
3.465
V
2.375
2.5
2.625
V
IDD
Power Supply Current
90
mA
IDDA
IDDO
Analog Supply Current
Output Supply Current
8
5
mA
mA
TABLE 3B. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDA = VDDO = 2.5V±5%, TA = -40°C TO 85°C
Symbol
VDD
Parameter
Core Supply Voltage
VDDA
Test Conditions
Minimum
2.375
Typical
2.5
Maximum
2.625
Units
V
Analog Supply Voltage
2.375
2.5
2.625
V
2.375
2.5
2.625
VDDO
Output Supply Voltage
IDD
Power Supply Current
80
mA
IDDA
IDDO
Analog Supply Current
Output Supply Current
8
5
mA
mA
840004AGI
www.icst.com/products/hiperclocks.html
3
V
REV. A JUNE 28, 2005
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840004I
FEMTOCLOCKS™CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
TABLE 3D. LVCMOS/LVTTL DC CHARACTERISTICS, VDD = VDDA = VDDO = 3.3V±5% OR 2.5V±5%, OR
VDD = VDDA = 3.3V±5%, VDDO = 2.5V±5%, TA = -40°C TO 85°C
Symbol Parameter
VIH
Input
High Voltage
VIL
Input
Low Voltage
IIH
Input
High Current
IIL
Input
Low Current
Test Conditions
OE, F_SEL0, F_SEL1
nPLL_SEL, MR,
nXTAL_SEL, TEST_CLK
OE, F_SEL0, F_SEL1
nPLL_SEL, MR,
nXTAL_SEL, TEST_CLK
VOH
Output High Voltage; NOTE 1
VOL
Output Low Voltage; NOTE 1
Minimum Typical
Maximum
Units
VDD = 3.3V
2
VDD + 0.3
V
VDD = 2.5V
1.7
VDD + 0.3
V
VDD = 3.3V
-0.3
0.8
V
VDD = 2.5V
VDD = VIN = 3.465V
or 2.625V
VDD = VIN = 3.465V
or 2.625V
VDD = 3.465V or 2.625V,
VIN = 0V
-0.3
0.7
V
5
µA
150
µA
-150
µA
VDD = 3.465V or 2.625V,
VIN = 0V
-5
µA
VDDO = 3.3V ± 5%
2. 6
V
VDDO = 2.5V ± 5%
1.8
V
VDDO = 3.3V or 2.5V ± 5%
0. 5
V
NOTE 1: Outputs terminated with 50Ω to VDDO/2. See Parameter Measurement Information, Output Load Test Circuit.
TABLE 4. CRYSTAL CHARACTERISTICS
Parameter
Test Conditions
Mode of Oscillation
Minimum
Typical
Maximum
Units
Fundamental
Frequency
26.5625
MHz
Ω
Equivalent Series Resistance (ESR)
50
Shunt Capacitance
7
pF
Drive Level
1
mW
NOTE: Characterized using an 18pf parallel resonant cr ystal.
840004AGI
www.icst.com/products/hiperclocks.html
4
REV. A JUNE 28, 2005
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840004I
FEMTOCLOCKS™CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
TABLE 5A. AC CHARACTERISTICS, VDD = VDDA = VDDO = 3.3V±5%, TA = -40°C TO 85°C
Symbol
Parameter
Test Conditions
Minimum
Typical
Maximum
212.5
fOUT
tsk(o)
tjit(Ø)
tR / tF
Output Frequency
Output Skew; NOTE 1, 2
RMS Phase Jitter (Random);
NOTE 3
Output Rise/Fall Time
Units
MHz
159.375
MHz
156.25
MHz
106.25
MHz
53.125
MHz
TBD
ps
212.5MHz (2.55MHz - 20MHz)
0.49
ps
159.375MHz (1.875MHz - 20MHz)
0.55
ps
156.25MHz (1.875MHz - 20MHz)
TBD
ps
106.25MHz (637kHz - 5MHz)
0.79
ps
53.125MHz (637kHz - 5MHz)
TBD
ps
20% to 80%
400
ps
odc
Output Duty Cycle
50
NOTE 1: Defined as skew between outputs at the same supply voltages and with equal load conditions.
Measured at VDDO/2.
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 3: Please refer to the Phase Noise Plot.
%
TABLE 5B. AC CHARACTERISTICS, VDD = VDDA = 3.3V±5%, VDDO = 2.5V±5%, TA = -40°C TO 85°C
Symbol
fOUT
tsk(o)
tjit(Ø)
t R / tF
Parameter
Test Conditions
Output Frequency
Output Skew; NOTE 1, 2
RMS Phase Jitter (Random);
NOTE 3
Output Rise/Fall Time
Minimum
Typical
Units
212.5
MHz
159.375
MHz
156.25
MHz
106.25
MHz
53.125
MHz
TBD
ps
212.5MHz (2.55MHz - 20MHz)
0.46
ps
159.375MHz (1.875MHz - 20MHz)
0.54
ps
156.25MHz (1.875MHz - 20MHz)
0.57
ps
106.25MHz (637kHz - 5MHz)
0.73
ps
53.125MHz (637kHz - 5MHz)
0.63
ps
20% to 80%
450
ps
odc
Output Duty Cycle
50
NOTE 1: Defined as skew between outputs at the same supply voltages and with equal load conditions.
Measured at VDDO/2.
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 3: Please refer to the Phase Noise Plot.
840004AGI
Maximum
www.icst.com/products/hiperclocks.html
5
%
REV. A JUNE 28, 2005
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840004I
FEMTOCLOCKS™CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
TABLE 5C. AC CHARACTERISTICS, VDD = VDDA = VDDO = 2.5V±5%, TA = -40°C TO 85°C
Symbol
Parameter
Test Conditions
Minimum
Typical
212.5
fOUT
tsk(o)
tjit(Ø)
tR / tF
Output Frequency
Output Skew; NOTE 1, 2
RMS Phase Jitter (Random);
NOTE 3
Output Rise/Fall Time
Units
MHz
159.375
MHz
156.25
MHz
106.25
MHz
53.125
MHz
TBD
ps
212.5MHz (2.55MHz - 20MHz)
0.51
ps
159.375MHz (1.875MHz - 20MHz)
0.51
ps
156.25MHz (1.875MHz - 20MHz)
0.54
ps
106.25MHz (637kHz - 5MHz)
0.72
ps
53.125MHz (637kHz - 5MHz)
0.71
ps
20% to 80%
450
ps
odc
Output Duty Cycle
50
NOTE 1: Defined as skew between outputs at the same supply voltages and with equal load conditions.
Measured at VDDO/2.
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 3: Please refer to the Phase Noise Plot.
840004AGI
Maximum
www.icst.com/products/hiperclocks.html
6
%
REV. A JUNE 28, 2005
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840004I
FEMTOCLOCKS™CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
PARAMETER MEASUREMENT INFORMATION
2.05V±5% 1.25V±5%
1.65V±5%
SCOPE
VDD ,
VDDA, VDDO
Qx
LVCMOS
SCOPE
VDD ,
VDDA
VDDO
Qx
LVCMOS
GND
GND
-1.25V±5%
-1.65V±5%
3.3V CORE/3.3V OUTPUT LOAD AC TEST CIRCUIT
3.3V CORE/2.5V OUTPUT LOAD AC TEST CIRCUIT
1.25V±5%
Noise Power
Phase Noise Plot
SCOPE
VDD ,
VDDA, VDDO
Qx
LVCMOS
Phase Noise Mask
GND
Offset Frequency
f1
RMS Jitter = Area Under the Masked Phase Noise Plot
-1.25V±5%
2.5V CORE/2.5V OUTPUT LOAD AC TEST CIRCUIT
RMS PHASE JITTER
V
DDO
Qx
80%
80%
tR
tF
2
Clock
Outputs
V
DDO
Qy
f2
20%
20%
2
tsk(o)
OUTPUT SKEW
OUTPUT RISE/FALL TIME
V
DDO
2
Q0:Q3
t PW
t
odc =
PERIOD
t PW
x 100%
t PERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
840004AGI
www.icst.com/products/hiperclocks.html
7
REV. A JUNE 28, 2005
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840004I
FEMTOCLOCKS™CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
APPLICATION INFORMATION
POWER SUPPLY FILTERING TECHNIQUES
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS840004I 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 bypass capacitors should be
used for each pin. To achieve optimum jitter performance,
power supply isolation is required. Figure 1 illustrates how
a 10Ω resistor along with a 10µF and a .01μF bypass
capacitor should be connected to each VDDA.
3.3V or 2.5V
VDD
.01μF
10Ω
V DDA
.01μF
10μF
FIGURE 1. POWER SUPPLY FILTERING
CRYSTAL INPUT INTERFACE
determined using a 26.5625MHz 18pF parallel resonant crystal and
were chosen to minimize the ppm error.
The ICS840004I has been characterized with 18pF parallel resonant crystals. The capacitor values shown in Figure 2 below were
XTAL_IN
C1
22p
X1
18pF Parallel Cry stal
XTAL_OUT
C2
22p
ICS84332
Figure 2. CRYSTAL INPUt INTERFACE
840004AGI
www.icst.com/products/hiperclocks.html
8
REV. A JUNE 28, 2005
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840004I
FEMTOCLOCKS™CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
LAYOUT GUIDELINE
and C2=22pF are recommended for frequency accuracy. For
different board layout, the C1 and C2 may be slightly adjusted
for optimizing frequency accuracy. 1KΩ pullup or pulldown resistors can be used for the logic control input pins.
Figure 3 shows a schematic example of the ICS840004I. An
example of LVCMOS termination is shown in this schematic.
Additional LVCMOS termination approaches are shown in the
LVCMOS Termination Application Note. In this example, an 18
pF parallel resonant 26.5625MHz crystal is used. The C1=22pF
Logic Control Input Examples
Set Logic
Input to
'1'
VDD
Set Logic
Input to
'0'
VDD
RU1
1K
VDD=3.3V
VDDO=3.3V
RU2
Not Install
To Logic
Input
pins
R3
36
RD1
Not Install
RD2
1K
U1
VDDO
VDD
VDD
VDDA
R2
10
Zo = 50 Ohm
To Logic
Input
pins
C3
10uF
VDD
C4
0.01u
1
2
3
4
5
6
7
8
9
10
F_SEL0
nc
nXTAL_SEL
TEST_CLK
OE
MR
nPLL_SEL
VDDA
nc
VDD
F_SEL1
GND
Q0
Q1
VDDO
Q2
Q3
GND
XTAL_IN
XTAL_OUT
LVCMOS
20
19
18
17
16
15
14
13
12
11
VDD
R5
100
C6
0.1u
Zo = 50 Ohm
C5
0.1u
ICS840004i
R4
100
XTAL_OUT
C2
22pF
LVCMOS
X1
XTAL_IN
Optional Termination
C1
22pF
If not using the crystal input, it can be left
floating. For additional protection the XTAL_IN
pin can be tied to ground.
Unused outputs can be left floating. There should be
no trace attached to unused outputs. Device
characterized and specification limits set with all
outputs terminated.
FIGURE 3. ICS840004I SCHEMATIC EXAMPLE
RELIABILITY INFORMATION
TABLE 6. θJAVS. AIR FLOW TABLE
FOR
20 LEAD TSSOP
θ JA by Velocity (Linear Feet per Minute)
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
0
200
500
114.5°C/W
73.2°C/W
98.0°C/W
66.6°C/W
88.0°C/W
63.5°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TRANSISTOR COUNT
The transistor count for ICS840004I is: 3085
840004AGI
www.icst.com/products/hiperclocks.html
9
REV. A JUNE 28, 2005
PRELIMINARY
Integrated
Circuit
Systems, Inc.
PACKAGE OUTLINE - G SUFFIX
ICS840004I
FEMTOCLOCKS™CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
FOR
20 LEAD TSSOP
TABLE 7. PACKAGE DIMENSIONS
Millimeters
SYMBOL
MIN
N
MAX
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
E
E1
6.60
6.40 BASIC
4.30
e
4.50
0.65 BASIC
L
0.45
0.75
α
0°
8°
aaa
--
0.10
Reference Document: JEDEC Publication 95, MO-153
840004AGI
www.icst.com/products/hiperclocks.html
10
REV. A JUNE 28, 2005
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840004I
FEMTOCLOCKS™CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
TABLE 8. ORDERING INFORMATION
Part/Order Number
Marking
Package
Shipping Packaging
Temperature
ICS840004AGI
ICS840004AGI
20 Lead TSSOP
tube
-40°C to 85°C
ICS840004AGIT
ICS840004AGI
20 Lead TSSOP
2500 tape & reel
-40°C to 85°C
The aforementioned trademarks, HiPerClockS™ and FEMTOCLOCKS™ are trademarks of Integrated Circuit Systems, Inc. or its subsidiaries in the United States and/or other countries.
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its use
or for 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 ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product
for use in life support devices or critical medical instruments.
840004AGI
www.icst.com/products/hiperclocks.html
11
REV. A JUNE 28, 2005
Similar pages