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ICS844246I

FEMTOCLOCKS CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER


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ICS844246I pdf
PRELIMINARY
FEMTOCLOCKS™ CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
ICS844246I
GENERAL DESCRIPTION
ICS
HiPerClockS™
The ICS844246I is a Cr ystal-to-LVDS Clock
Synthesizer/Fanout Buffer designed for Fibre
Channel and Gigabit Ethernet applications and is
a member of the HiperClockS™ family of High
Performance Clock Solutions from IDT. The output
frequency can be set using the frequency select pins and a
25MHz crystal for Ethernet frequencies, or a 26.5625MHz
crystal for a Fibre Channel. The low phase noise character-
istics of the ICS844246I make it an ideal clock for these
demanding applications.
SELECT FUNCTION TABLE
Inputs
FB_SEL N_SEL1 N_SEL0
00 0
00
1
0 10
011
10
0
10
1
110
11 1
M Divide
20
20
20
20
24
24
24
24
Function
N Divide
2
4
5
8
3
4
6
12
M/N
10
5
4
2.5
8
6
4
2
FEATURES
Six LVDS outputs
Crystal oscillator interface
Output frequency range: 53.125MHz to 333.3333MHz
Crystal input frequency range: 25MHz to 33.333MHz
RMS phase jitter at 125MHz, using a 25MHz crystal
(1.875MHz to 20MHz): 0.39ps (typical)
Full 3.3V or 3.3V core, 2.5V output supply mode
-40°C to 85°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
BLOCK DIAGRAM
PIN ASSIGNMENT
PLL_BYPASS Pullup
XTAL_IN
XTAL_OUT
OSC
FB_SEL Pulldown
www.DNa_taSSELh1eetP4uUllu.pcom
Pullup
N_SEL0
1
Output
PLL 0 Divider
Feedback
Divider
Q0
nQ0
Q1
nQ1
Q2
nQ2
VDDO
VDDO
nQ2
Q2
nQ1
Q1
nQ0
Q0
PLL_BYPASS
VDDA
VDD
FB_SEL
1
2
3
4
5
6
7
8
9
10
11
12
24 Q3
23 nQ3
22 Q4
21 nQ4
20 Q5
19 nQ5
18 N_SEL1
17 GND
16 GND
15 N_SEL0
14 XTAL_OUT
13 XTAL_IN
Q3 ICS844246I
nQ3 24-Lead TSSOP, E-Pad
4.40mm x 7.8mm x 0.90mm
Q4 body package
G Package
nQ4 Top View
Q5
nQ5
The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization
and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT/ ICSLVDS FREQUENCY SYNTHESIZER W/FANOUT BUFFER 1
ICS844246BGI REV. A NOVEMBER 14, 2007



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ICS844246I pdf
ICS844246I
FEMTOCLOCKS™ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER PRELIMINARY
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1, 2
VDDO
Power
3, 4 nQ2, Q2 Output
Output supply pins.
Differential output pair. LVDS interface levels.
5, 6 nQ1, Q1 Output
Differential output pair. LVDS interface levels.
7, 8 nQ0, Q0 Output
Differential output pair. LVDS interface levels.
Selects between the PLL and crystal inputs as the input to the dividers.
9 PLL_BYPASS Input Pullup When LOW, selects PLL. When HIGH, selects XTAL_IN, XTAL_OUT.
LVCMOS / LVTTL interface levels.
10
VDDA
Power
Analog supply pin.
11 VDD Power
Core supply pin.
12
FB_SEL
Input Pulldown Feedback frequency select pin. LVCMOS/LVTTL interface levels.
13,
14
XTAL_IN,
XTAL_OUT
Input
Crystal oscillator interface. XTAL_IN is the input.
XTAL_OUT is the output.
15,
18
N_SEL0
N_SEL1
Input Pullup Output frequency select pin. LVCMOS/LVTTL interface levels.
16, 17
GND
Power supply ground.
19, 20
nQ5, Q5 Output
Differential output pair. LVDS interface levels.
21, 22
nQ4, Q4 Output
Differential output pair. LVDS interface levels.
23, 24
nQ3, Q3 Output
Differential output pair. LVDS interface levels.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
RPULLUP
RPULLDOWN
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
51
Maximum
Units
pF
kΩ
kΩ
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IDT/ ICSLVDS FREQUENCY SYNTHESIZER W/FANOUT BUFFER 2
ICS844246BGI REV. A NOVEMBER 14, 2007



Part Number ICS844246I
Description FEMTOCLOCKS CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
Maker Integrated Device Technology - Integrated Device Technology
Total Page 16 Pages
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