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843256CK-24LF

Description
Clock Synthesizer / Jitter Cleaner 6 LVPECL OUT FEMTOCLOCK
CategoryThe embedded processor and controller    Microcontrollers and processors   
File Size243KB,16 Pages
ManufacturerIDT (Integrated Device Technology)
Environmental Compliance
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843256CK-24LF Overview

Clock Synthesizer / Jitter Cleaner 6 LVPECL OUT FEMTOCLOCK

843256CK-24LF Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
MakerIDT (Integrated Device Technology)
Parts packaging codeQFN
package instructionHVQCCN,
Contacts24
Reach Compliance Codecompliant
ECCN codeEAR99
JESD-30 codeS-XQCC-N24
JESD-609 codee3
length5 mm
Number of terminals24
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output clock frequency390.625 MHz
Package body materialUNSPECIFIED
encapsulated codeHVQCCN
Package shapeSQUARE
Package formCHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)260
Master clock/crystal nominal frequency31.25 MHz
Certification statusNot Qualified
Maximum seat height1 mm
Maximum supply voltage3.465 V
Minimum supply voltage3.135 V
Nominal supply voltage3.3 V
surface mountYES
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationQUAD
Maximum time at peak reflow temperature30
width5 mm
uPs/uCs/peripheral integrated circuit typeCLOCK GENERATOR, OTHER
Base Number Matches1
FemtoClock
®
Crystal-to-3.3V LVPECL
Frequency Synthesizer With/Integrated Fanout Buffer
G
ENERAL
D
ESCRIPTION
The 843256 is a Crystal-to-3.3V LVPECL Clock Synthesizer/Fanout
Buffer designed for Fibre Channel and Gigabit Ethernet applications.
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 characteristics of the 843256 make it
an ideal clock for these demanding applications.
843256
DATASHEET
F
EATURES
• Six 3.3V differential LVPECL output pairs
• Output frequency range: 62.5MHz to 625MHz
Crystal input frequency range: 15.625MHz to 25.5MHz
RMS phase jitter at 156.25MHz, using a 25MHz crystal
(1.875MHz to 20MHz): 0.41ps (typical) @ 3.3V
Operating supply modes:
Core/Output
3.3V/3.3V
3.3V/2.5V
• 0°C to 70°C ambient operating temperature
Available in lead-free (RoHS 6) package
S
ELECT
F
UNCTION
T
ABLE
Inputs
FB_SEL
0
0
0
0
1
1
1
1
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
B
LOCK
D
IAGRAM
PLL_BYPASS
Pullup
Q0
nQ0
Q1
P
IN
A
SSIGNMENT
1
XTAL_IN
OSC
XTAL_OUT
PLL
0
N
Output
Divider
nQ1
Q2
nQ2
M
Feedback
Divider
FB_SEL
Pulldown
N_SEL1
N_SEL0
Pullup
Pullup
Q3
nQ3
Q4
nQ4
Q5
nQ5
24-Lead TSSOP, E-Pad
4.40mm x 7.8mm x 0.92mm
body package
G Package
Top View
843256 REVISION B DECEMBER 18, 2014
1
©2014 Integrated Device Technology, Inc.
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