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841N254BKILF

Description
Clock Synthesizer / Jitter Cleaner Femtoclock NG Crystal to LVDS/HCSL
Categorysemiconductor    Analog mixed-signal IC   
File Size462KB,24 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
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841N254BKILF Overview

Clock Synthesizer / Jitter Cleaner Femtoclock NG Crystal to LVDS/HCSL

841N254BKILF Parametric

Parameter NameAttribute value
Product AttributeAttribute Value
ManufacturerIDT (Integrated Device Technology, Inc.)
Product CategoryClock Synthesizer / Jitter Cleaner
RoHSDetails
Number of Outputs4 Output
Output LevelHCSL, LVDS
Max Output Freq250 MHz
Input LevelClock, Crystal, LVCMOS
Maximum Input Frequency250 MHz
Supply Voltage - Max3.465 V
Supply Voltage - Min2.375 V
Maximum Operating Temperature+ 85 C
Minimum Operating Temperature- 40 C
Mounting StyleSMD/SMT
Package / CaseVFQFPN-32
PackagingTray
Height1 mm
Length5 mm
Width5 mm
Moisture SensitiveYes
Factory Pack Quantity490
FemtoClock
®
NG Crystal-to-LVDS/ HCSL
Clock Synthesizer
841N254B
Datasheet
General Description
The 841N254B is a 4-output clock synthesizer designed for S-RIO
1.3 and 2.0 reference clock applications. The device generates four
copies of a selectable 250MHz, 156.25MHz, 125MHz or 100MHz
clock signal with excellent phase jitter performance. The four outputs
are organized in two banks of two LVDS and two HCSL ouputs.The
device uses IDT’s fourth generation FemtoClock
®
NG technology for
an optimum of high clock frequency and low phase noise
performance, combined with a low power consumption and high
power supply noise rejection. The synthesized clock frequency and
the phase-noise performance are optimized for driving RIO 1.3 and
2.0 SerDes reference clocks. The device supports 3.3V and 2.5V
voltage supplies and is packaged in a small 32-lead VFQFN
package. The extended temperature range supports wireless
infrastructure, telecommunication and networking end equipment
requirements.
Features
Fourth generation FemtoClock
®
(NG) technology
Selectable 250MHz, 156.25MHz, 125MHz or 100MHz output
clock synthesized from a 25MHz fundamental mode crystal
Four differential clock outputs (two LVDS and two HCSL outputs)
Crystal interface designed for 25MHz,
parallel resonant crystal
RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(1MHz - 20MHz): 0.27ps (typical)
RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(12kHz - 20MHz): 0.32ps (typical)
Power supply noise rejection PSNR: -50dB (typical)
LVCMOS interface levels for the frequency select input
Full 3.3V or 2.5V supply voltage
Lead-free (RoHS 6) packaging
-40°C to 85°C ambient operating temperature
Function Table
Inputs
F_SEL1
0 (default)
0
1
1
F_SEL0
0 (default)
1
0
1
V
DDOB
nQB0
nQB1
F_SEL0
156.25MHz
125MHz
100MHz
250MHz
V
DD
nc
1
2
32 31 30 29 28 27 26 25
24 IREF
GND
GND
QB1
QB0
V
DD
Output Frequency with
f
XTAL
= 25MHz
Pin Assignment
841N254B
32-lead VFQFN
K Package
5mm x 5mm x 0.925mm
package body
Top View
23 GND
22 nQA0
21 QA0
20 V
DDOA
19 nQA1
18 QA1
17 GND
V
DDA
3
nc 4
NOTE: F_SEL[1:0] are asynchronous controls.
GND
REF_CLK
5
6
nOEA 7
V
DD
8
9
nOEB
10 11 12 13 14 15 16
BYPASS
REF_SEL
XTAL_OUT
XTAL_IN
F_SEL1
V
DD
Block Diagram
XTAL_IN
OSC
XTAL_OUT
REF_CLK
REF_SEL
BYPASS
F_SEL[0:1]
nOEA
nOEB
IREF
Pulldown
1
0
1
PFD
&
LPF
FemtoClock
®
NG
VCO
625MHz
÷25
÷N
0
QA0
nQA0
QA1
nQA1
QB0
nQB0
QB1
nQB1
Pulldown
Pulldown
Pulldown
Pulldown
Pulldown
2
LVDS
LVDS
HCSL
HCSL
©2016 Integrated Device Technology, Inc..
1
Revision B, May 23, 2016

841N254BKILF Related Products

841N254BKILF 841N254AKILFT
Description Clock Synthesizer / Jitter Cleaner Femtoclock NG Crystal to LVDS/HCSL Clock Synthesizer / Jitter Cleaner OUTPUT CLOCK SYNTHESIZER
Product Attribute Attribute Value Attribute Value
Manufacturer IDT (Integrated Device Technology, Inc.) IDT (Integrated Device Technology, Inc.)
Product Category Clock Synthesizer / Jitter Cleaner Clock Synthesizer / Jitter Cleaner
RoHS Details Details
Package / Case VFQFPN-32 VFQFPN-32
Height 1 mm 1 mm
Length 5 mm 5 mm
Width 5 mm 5 mm
Moisture Sensitive Yes Yes
Factory Pack Quantity 490 2000
Packaging Tray Reel
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