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843251AGI-04LFT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
DATA SHEET
FemtoClock
®
Crystal-to-3.3V LVPECL
Clock Generator
843251I-04
843251I-04 REVISION B 10/29/15 1 ©2015 Integrated Device Technology, Inc.
General Description
The 843251I-04 is a 10Gb/12Gb Ethernet Clock Generator. The
843251I-04 can synthesize 10 Gigabit Ethernet and 12 Gigabit
Ethernet with a 25MHz crystal. It can also generate SATA and 10Gb
Fibre Channel reference clock frequencies with the appropriate
choice of crystals. The 843251I-04 has excellent phase jitter
performance and is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
Features
• One differential 3.3V LVPECL output
• Crystal oscillator interface designed for
18pF parallel resonant crystal
• Crystal input frequency range: 19.33MHz – 30MHz
• Output frequency range: 145MHz – 187.5MHz
• VCO range: 580MHz – 750MHz
• RMS phase jitter @ 156.25MHz, (1.875MHz – 20MHz):
0.39ps (typical)
• Full 3.3V supply mode
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) package
Configuration Table with 25MHz Crystal
Configuration Table with Selectable Crystals
Inputs
Output Frequency
(MHz) Application
Crystal Frequency
(MHz)) Feedback Divide
VCO Frequency
(MHz) N Output Divide
25 30 750 4 187.5 12 Gigabit Ethernet
25 25 625 4 156.25 10 Gigabit Ethernet
Inputs
Output Frequency
(MHz) Application
Crystal Frequency
(MHz)) Feedback Divide
VCO Frequency
(MHz) N Output Divide
20 30 600 4 150 SATA
21.25 30 637.5 4 159.375 10 Gigabit Fibre Channel
24 25 600 4 150 SATA
25.5 25 637.5 4 159.375 10 Gigabit Fibre Channel
30 25 750 4 187.5 12 Gigabit Fibre Channel
Pin Assignment
1
2
3
4
8
7
6
5
Q
nQ
FREQ_SEL
V
CC
VCCA
VEE
XTAL_OUT
XTAL_IN
Block Diagram
OSC
Phase
Detector
VCO
580MHz-750MHz
DIV. N
÷4
0 = ÷25 (default)
1 = ÷30
XTAL_IN
XTAL_OUT
FREQ_SEL
nQ
Q
843251I-04
8 Lead TSSOP
4.40mm x 3.0mm package body
FEMTOCLOCK
®
CRYSTALl-TO-3.3V LVPECL CLOCK GENERATOR 2 REVISION B 10/29/15
843251I-04 DATA SHEET
Pin Description and Pin Characteristic Tables
Table 1. Pin Descriptions
NOTE: Pulldown refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Number Name Type Description
1V
CCA
Unused Analog supply pin.
2V
EE
Power Negative supply pin.
3, 4
XTAL_OUT
XTAL_IN
Input Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output.
5 FREQ_SEL Input Pulldown Frequency select pin. LVCMOS/LVTTL interface levels.
6, 7 nQ, Q Output Differential output pair. LVPECL interface levels.
8V
CC
Power Core supply pin.
Symbol Parameter Test Conditions Minimum Typical Maximum Units
C
IN
Input Capacitance 4 pF
R
PULLDOWN
Input Pulldown Resistor 51 k
REVISION B 10/29/15 3 FEMTOCLOCK
®
CRYSTALL-TO-3.3V LVPECL CLOCK GENERATOR
843251I-04 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 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.
DC Electrical Characteristics
Table 3A. Power Supply DC Characteristics, V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Table 3B. LVCMOS/LVTTL DC Characteristics, V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Table 3C. LVPECL DC Characteristics, V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
NOTE 1: Outputs termination with 50 to V
CC
– 2V.
Item Rating
Supply Voltage, V
CC
4.6V
Inputs, V
I
-0.5V to V
CC
+ 0.5V
Outputs, I
O
Continuous Current
Surge Current
50mA
100mA
Package Thermal Impedance,
JA
129.5C/W (0 mps)
Storage Temperature, T
STG
-65C to 150C
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
CC
Positive Supply Voltage 3.135 3.3 3.465 V
V
CCA
Analog Supply Voltage V
CC
– 0.13 3.3 V
CC
V
I
EE
Power Supply Current 70 mA
i
CCA
Analog Supply Current 13 mA
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
IH
Input High Voltage 2 V
CC
+ 0.3 V
V
IL
Input Low Voltage -0.3 0.8 V
I
IH
Input High Current V
CC
= V
IN
= 3.465V 150 µA
I
IL
Input Low Current V
CC
= 3.465V, V
IN
= 0V -5 µA
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
OH
Output High Current; NOTE 1 V
CC
– 1.4 V
CC
– 0.9 µA
V
OL
Output Low Current; NOTE 1 V
CC
– 2.0 V
CC
– 1.7 µA
V
SWING
Peak-to-Peak Output Voltage Swing 0.6 1.0 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

843251AGI-04LFT

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Manufacturer:
Description:
Clock Generators & Support Products 1 LVPECL OUT SYNTHESIZER
Lifecycle:
New from this manufacturer.
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