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ICS844256 Datasheet Preview

ICS844256 Datasheet

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

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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844256
FEMTOCLOCKS™CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
GENERAL DESCRIPTION
The ICS844256 is a Crystal-to-LVDS Clock
ICS Synthesizer/Fanout Buffer designed for SONET
HiPerClockS™ and Gigabit Ethernet applications and is a
member of the HiperClockS™ family of High
Performance Clock Solutions from ICS. The
output frequency can be set using the frequency select
pins and a 25MHz crystal for Ethernet frequencies, or a
19.44MHz crystal for SONET. The low phase noise charac-
teristics of the ICS844256 make it an ideal clock for these
demanding applications.
FEATURES
Six LVDS outputs
Crystal oscillator interface
Output frequency range: 62.5MHz to 622.08MHz
Crystal input frequency range: 15.625MHz to 25.5MHz
RMS phase jitter at 125MHz, using a 25MHz crystal
(1.875MHz to 20MHz): 0.48ps (typical)
Full 3.3V or 3.3V core, 2.5V output supply mode
0°C to 70°C ambient operating temperature
Industrial temperature information available upon request
SELECT FUNCTION TABLE
Available in both standard and lead-free RoHS-compliant
packages
FB_SEL
0
0
0
0
1
1
1
1
Inputs
N_SEL1
0
0
1
1
0
0
1
1
N_SEL0
0
1
0
1
0
1
0
1
M Divide
25
25
25
25
32
32
32
32
Function
N Divide
1
2
4
5
1
2
4
8
M/N
25
12.5
6.25
5
32
16
8
4
BLOCK DIAGRAM
PIN ASSIGNMENT
PLL_BYPASS Pullup
XTAL_IN
XTAL_OUT
OSC
1 Output
PLL Divider
0
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
FB_SEL Pulldown
N_SEL1 Pullup
Pullup
N_SEL0
Feedback
Divider
Q3 ICS844256
24-Lead, 300-MIL SOIC
nQ3 7.5mm x 15.33mm x 2.3mm
body package
Q4 M Package
Top View
nQ4
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
Q5 body package
nQ5 G Package
Top View
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.
844256AM
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 29, 2005
1




ICS

ICS844256 Datasheet Preview

ICS844256 Datasheet

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

No Preview Available !

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844256
FEMTOCLOCKS™CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
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
R
PULLUP
RPULLDOWN
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
51
Maximum
Units
pF
kΩ
kΩ
844256AM
www.icst.com/products/hiperclocks.html
2
REV. A NOVEMBER 29, 2005


Part Number ICS844256
Description CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
Maker ICS
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