900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






ICS

ICS844246 Datasheet Preview

ICS844246 Datasheet

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

No Preview Available !

www.DataSheet4U.com
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844246
FEMTOCLOCKS™CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
GENERAL DESCRIPTION
The ICS844246 is a Crystal-to-LVDS Clock
ICS Synthesizer/Fanout Buffer designed for Fibre
HiPerClockS™ Channel 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 fre-
quencies, or a 26.5625MHz crystal for a Fibre Channel.
The low phase noise characteristics of the ICS844246
make it an ideal clock for these demanding applications.
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
0°C to 70°C ambient operating temperature
Industrial temperature information available upon request
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
Available in both standard and lead-free RoHS-compliant
packages
M/N
10
5
4
2.5
8
6
4
2
BLOCK DIAGRAM
PIN ASSIGNMENT
PLL_BYPASS Pullup
XTAL_IN
XTAL_OUT
OSC
PLL
1
Output
0 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
Feedback
Q3 ICS843246
24-Lead, 300-MIL SOIC
Divider
nQ3 7.5mm x 15.33mm x 2.3mm
body package
FB_SEL Pulldown
Q4 M Package
Top View
N_SEL1 Pullup
nQ4
24-Lead TSSOP
Pullup
N_SEL0
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.
844246AM
www.icst.com/products/hiperclocks.html
REV. A SEPTEMBER 29, 2005
1




ICS

ICS844246 Datasheet Preview

ICS844246 Datasheet

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

No Preview Available !

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844246
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
844246AM
www.icst.com/products/hiperclocks.html
2
REV. A SEPTEMBER 29, 2005


Part Number ICS844246
Description CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
Maker ICS
PDF Download

ICS844246 Datasheet PDF






Similar Datasheet

1 ICS844246 CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
ICS
2 ICS844246I FEMTOCLOCKS CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
Integrated Device Technology





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy