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PDF ICS843021I-01 Data sheet ( Hoja de datos )
| Número de pieza | ICS843021I-01 | |
| Descripción | FEMTOCLOCKS CRYSTAL-TO-3.3V 2.5V LVPECL CLOCK GENERATOR | |
| Fabricantes | Integrated Device Technology | |
| Logotipo |  |
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FEMTOCLOCKS™ CRYSTAL-TO-
3.3V, 2.5V LVPECL CLOCK GENERATOR
General Description
The ICS843021I-01 is a Gigabit Ethernet Clock
ICS Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from IDT. The
ICS843021I-01 uses a 25MHz crystal to synthesize
125MHz. The ICS843021I-01 has excellent phase
jitter performance, over the 1.875MHz – 20MHz integration range.
The ICS843021I-01 is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
ICS843021I-01
Features
• One differential 3.3V or 2.5V LVPECL output
• Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
• Output frequency range: 125MHz, using a 25MHz crystal
• VCO range: 490MHz – 640MHz
• RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz – 20MHz): 0.41ps (typical)
• Full 3.3V or 2.5V operating supply
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
Block Diagram
OE Pullup
25MHz
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
÷20
(fixed)
÷4
(fixed)
Pin Assignment
VCC 1
8Q
XTAL_OUT 2
7 nQ
XTAL_IN 3
6 VCC
Q
VEE 4
5 OE
nQ
ICS843021I-01
8 Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
IDT™ / ICS™ 3.3V , 2.5V LVPECL CLOCK GENERATOR
1
ICS843021AGI-01 REV. A DECEMBER 3, 2007
1 page  
ICS843021I-01
FEMTOCLOCKS™CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
www.DataSheet4U.com
Typical Phase Noise at 125MHz (3.3V or 2.5V)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
1k
Gigabit Ethernet Filter
125MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz (3.3V)= 0.41ps (typical)
1.875MHz to 20MHz (2.5V)= 0.42ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding a
Gigabit Ethernet filter to raw data
10k 100k 1M
10M 100M
Offset Frequency (Hz)
IDT™ / ICS™ 3.3V , 2.5V LVPECL CLOCK GENERATOR
5
ICS843021AGI-01 REV. A DECEMBER 3, 2007
5 Page 
ICS843021I-01
FEMTOCLOCKS™CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
www.DataSheet4U.com
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS843021I-01.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS843021I-01 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VCC = 3.3V + 5% = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
• Power (core)MAX = VCC_MAX * IEE_MAX = 3.465V * 64mA = 221.76mW
• Power (outputs)MAX = 30mW/Loaded Output pair
Total Power_MAX (3.3V, with all outputs switching) = 221.76mW + 30mW = 251.76mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the device.
The maximum recommended junction temperature for HiPerClockS devices is 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 129.5°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.252W * 90.5°C/W = 117.6°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 (single layer or multi-layer).
Table 6. Thermal Resistance θJA for 8 Lead TSSOP, Forced Convection
θJA by Velocity
Meters per Second
0
Multi-Layer PCB, JEDEC Standard Test Boards
129.5°C/W
1
125.5°C/W
2.5
123.5°C/W
IDT™ / ICS™ 3.3V , 2.5V LVPECL CLOCK GENERATOR
11
ICS843021AGI-01 REV. A DECEMBER 3, 2007
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ICS843021I-01.PDF ] | |
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