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ICS844S0258-07 Datasheet

Crystal/LVCMOS-toLVDS/LVCMOS Frequency Synthesizer

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FemtoClock® Crystal/LVCMOS-to-
LVDS/LVCMOS Frequency Synthesizer
ICS844S0258-07
DATASHEET
General Description
The ICS844S0258-07 is an eight output synthesizer optimized to
generate Gigabit and 10 Gigabit Ethernet clocks. Using a 25MHz,
18pF parallel resonant crystal, the device will generate 125MHz
clocks with mixed LVDS and LVCMOS/ LVTTL output levels.
ICS844S0258-07 uses IDT’s 3rd generation low phase noise VCO
technology and can achieve <1ps typical RMS phase jitter, easily
meeting Ethernet jitter requirements. ICS844S0258-07 is packaged
in a small, 32-pin VFQFN package that is optimum for applications
with space limitations.
Features
Seven LVDS differential output at 125MHz
One LVCMOS/LVTTL single-ended outputs at 125MHz
Selectable crystal oscillator interface or LVCMOS/LVTTL
single-ended input and PLL bypass from a single select pin
Output enable signal for three LVDS outputs
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.857MHz - 20MHz): 0.278ps (typical)
PCI Express (2.5Gb/s) and Gen 2 (5 Gb/s) jitter compliant
Full 3.3V supply mode
0°C to 70°C ambient operating temperature
Lead-free (RoHS 6) packaging
Pin Assignment
nPLL_BYPASS Pullup
Block Diagram
Q0
nQ0
GND
Q1
nQ1
VDDO_LVDS
Q2
nQ2
32 31 30 29 28 27 26 25
1 24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 10 11 12 13 14 15 16
GND
Q7
VDDO_LVCMOS
nQ6
Q6
VDDO_LVDS
nQ5
Q5
REF_CLK Pulldown
XTAL_IN
25MHz
OSC
XTAL_OUT
0
1
Phase
Detector
VCO
÷25
ICS844S0258-07
32-Lead VFQFN
5mm x 5mm x 0.925mm
package body
K Package
Top View
OE Pullup
0
÷5 1
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
Q4
nQ4
Q5
nQ5
Q6
nQ6
Q7
ICS844S0258CK-07 REVISION A DECEMBER 2, 2013
1
©2013 Integrated Device Technology, Inc.


Integrated Device Technology Electronic Components Datasheet

ICS844S0258-07 Datasheet

Crystal/LVCMOS-toLVDS/LVCMOS Frequency Synthesizer

No Preview Available !

ICS844S0258-07 Data Sheet
FEMTOCLOCK® CRYSTAL/LVCMOS-TO-LVDS/LVCMOS FREQUENCY SYNTHESIZER
Pin Descriptions and Characteristics
Table 1. Pin Descriptions
Number
1, 2
3, 9, 15,
24, 28, 32
4, 5
Name
Q0, nQ0
GND
Q1, nQ1
Type
Output
Power
Output
6, 12, 19
7, 8
10, 11
13, 14
VDDO_LVDS
Q2, nQ2
Q3, nQ3
Q4, nQ4
Power
Output
Output
Output
16
OE
Input
Pullup
17, 18
20, 21
22
23
25
26
27
29
30,31
Q5, nQ5
Q6, nQ6
VDDO_LVCMOS
Q7
VDD
nPLL_BYPAS
S
VDDA
REF_CLK
XTAL_IN,
XTAL_OUT
Output
Output
Power
Output
Power
Input
Power
Input
Input
Pullup
Pulldown
Description
Differential clock outputs. LVDS interface levels.
Power supply ground.
Differential clock outputs. LVDS interface levels.
Output supply pins for differential LVDS outputs.
Differential clock outputs. LVDS interface levels.
Differential clock outputs. LVDS interface levels.
Differential clock outputs. LVDS interface levels.
Output enable pin for Q[4:6]/nQ[4:6] outputs. If connected to HIGH or left
open, enables the outputs. When connected to LOW or GND, disables the
outputs to high-impedance state. LVCMOS/LVTTL interface levels.
Differential clock outputs. LVDS interface levels.
Differential clock outputs. LVDS interface levels.
Output supply pin for single-ended output.
Single-ended clock output. LVCMOS/LVTTL levels.
Core supply pin.
Input select and PLL bypass control pin. See Table 3.
LVCMOS/LVTTL interface levels.
Analog supply pin.
Single-ended reference clock input. Only selected in nPLL_BYPASS
mode. LVCMOS/LVTTL interface levels.
Crystal oscillator interface. XTAL_OUT is the output, XTAL_IN is the input.
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
CPD
Power Dissipation
Capacitance
Q7
RPULLUP
RPULLDOWN
ROUT
Input Pullup Resistor
Input Pulldown Resistor
Output Impedance Q7
Test Conditions
VDD, VDDO_LVCMOS = 3.465V
Minimum
Typical
2
12
51
51
20
Maximum
Units
pF
pF
k
k
Function Table
Table 3. PLL Bypass and Input Select Function Table
Inputs
nPLL_BYPASS
PLL Bypass
Input Selected
0
PLL Bypassed
REF_CLK
1
PLL Enabled
XTAL_IN/XTAL_OUT
ICS844S0258CK-07 REVISION A DECEMBER 2, 2013
2
©2013 Integrated Device Technology, Inc.


Part Number ICS844S0258-07
Description Crystal/LVCMOS-toLVDS/LVCMOS Frequency Synthesizer
Maker IDT
Total Page 21 Pages
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