replacing solutions requiring multiple oscillator and fanout buffer
solutions. The device supports 1% downspread spread spectrum
clocking. The ICS840304I has excellent phase jitter (<1ps rms)
over integration range of 1.5MHz - 22MHz. Designed for
Backplane, networ king and industrial applications, the
ICS840304I can also drive the high-speed PCI-X and PCI-e
SerDes clock inputs of communication processors, DSPs,
switches and bridges.
F
EATURES
• Four LVCMOS/LVTTL outputs,
20Ω typical output impedance
One REF_OUT LVCMOS/LVTTL clock output
• Selectable crystal oscillator interface, 25MHz,
18pF parallel resonant crystal or
LVCMOS/LVTTL single-ended clock input
• Support the following output frequencies: 33.33MHz,
66.67MHz, 100MHz or 133.33MHz
• VCO: 400MHz
• PLL and N divider bypass and output enable
• RMS phase jitter @100MHz, using a 25MHz crystal,
(1.5MHz - 22MHz): 0.46ps (typical) @ 3.3V
• Supports SSC, 1% downspread
• Full 3.3V and 2.5V supply modes
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
B
LOCK
D
IAGRAM
BYPASS
Pulldown
Q0
P
IN
A
SSIGNMENT
V
DD
XTAL_IN
XTAL_OUT
GND
REF_SEL
REF_IN
BYPASS
nc
V
DDA
F_SEL0
V
DD
F_SEL1
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
DDO
_
REF
REF_OUT
GND_REF
nOE
Q0
Q1
GND_Q
Q2
Q3
V
DDO
_
Q
nREF_OE
SSC
1
XTAL_IN
Q1
OSC
XTAL_OUT
REF_IN
Pulldown
0
FemtoClock
PLL
VCO = 400MHz
÷N
0
Q2
1
Q3
REF_SEL
Pulldown
M = ÷16
ICS840304I
24-Lead, 173-MIL TSSOP
4.4mm x 7.8mm x 0.92mm
body package
G Package
Top View
REF_OUT
SSC
Pulldown
nOE
Pulldown
F_SEL[1:0]
nREF_OE
Pulldown
Pullup
2
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
™
/ ICS
™
LVCMOS/LVTTL FREQUENCY SYNTHESIZER
1
ICS840304BGI REV A DECEMBER 4, 2006
ICS840304I
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY SYNTHESIZER
PRELIMINARY
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1, 11
2,
3
4
5
6
7
8
9
10,
12
13
14
15
16, 17,
19 , 2 0
18
21
22
23
24
Name
V
DD
XTAL_IN,
XTAL_OUT
GND
REF_SEL
REF_IN
BYPASS
nc
V
DDA
F_SEL0,
F_SEL1
SSC
nREF_OE
V
DDO_Q
Q3, Q2,
Q1, Q0
GND_Q
nOE
GND_REF
REF_OUT
V
DDO_REF
Power
Input
Power
Input
Input
Input
Unused
Power
Input
Input
Input
Power
Output
Power
Input
Power
Output
Power
Type
Description
Core supply pins.
Crystal oscillator interface. XTAL_OUT is the output.
XTAL_IN is the input.
Power supply ground.
Reference select pin. When HIGH selects REF_IN. When LOW,
The embedded fingerprint collection management hardware has an ARM embedded board and a zfm-20 fingerprint collection module. I want to write a program under the Linux system and burn it to the embedd...
[i=s]This post was last edited by paulhyde on 2014-9-15 03:05[/i] What are the amplifier chips of TI? I am not very knowledgeable, please help me. Thanks in advance!!!...
I use the following code to make a pop-up menu under EVC: CPoint point; point.x=50; point.y=100; CMenu menu; menu->LoadMenu(IDR_MENU1); CMenu *pPopMenu = menu->GetSubMenu( 0); pPopMenu->TrackPopupMenu...
What does it mean when the port latch is set to 1? How should I understand this sentence? It would be better if there is a picture to illustrate it....
Abstract:
With the increasing complexity of smart vehicle electrical and electronic architectures, the full lifecycle management of vehicle electronic control components faces multiple challe...[Details]
As more and more consumers purchase new energy vehicles, the safety of electric vehicles has become a major concern. This has been particularly prominent following a series of electric vehicle fire...[Details]
In recent years, the government has increasingly supported electric vehicles, and the number of electric vehicles has increased. Observant drivers will notice that there are many more green license...[Details]
As time goes by, people are increasingly concerned about their own and their families' health. However, existing monitoring devices for individual vital signs have struggled to gain market share du...[Details]
In June 2014, the Ministry of Industry and Information Technology issued 4G FD-LTE licenses to China Unicom and China Telecom. Together with the 4G TD-LTE licenses issued to China Mobile, China Uni...[Details]
Have you ever heard stories about "crazy appliances"? Think of microwaves that turn on automatically or ovens that preheat without any human input? With radios and electromagnetic interfaces ubiqui...[Details]
1. Fault phenomenon and cause analysis
1. During the operation of the equipment, the expansion sleeve is subjected to a large torque, and the mating surfaces of the shaft and the sleeve move...[Details]
In the field of communications power supplies, AC/DC rectifier power supplies are called primary power supplies or basic power supplies, while DC/DC converters are called secondary power supplies. ...[Details]
Shenzhen Baowei Power Supply high frequency pure sine wave power, communication inverter power supply has two communication interfaces, RS232 and R485 interfaces, their functions and characteristic...[Details]
A pure sine wave inverter has a good output waveform with very low distortion, and its output waveform is essentially the same as the AC waveform of the mains power grid. In fact, the AC power prov...[Details]
There are more and more electric vehicles. Recently, I have heard some news about electric vehicles performing poorly in winter. I would like to briefly introduce whether heat pump technology is mo...[Details]
With the gradual popularization of new energy vehicles in recent years, more and more people have been able to access and purchase electric vehicles. The structure of electric vehicles is composed ...[Details]
Analog Devices held a third-quarter fiscal 2025 earnings conference call. Vincent T. Roche, CEO and Chairman of the Board, and Richard C. Puccio, Executive Vice President and Chief Financial Office...[Details]
01. Introduction
As in-vehicle networks migrate from the CAN
bus
to
Ethernet
, traditional millisecond-level synchronization accuracy can no longer meet the requirements of mul...[Details]
I believe everyone has heard of memory. If your computer is slow, your experts may recommend upgrading it to a larger capacity. But what exactly is computer memory used for? Why does memory capacit...[Details]
Embedded System
京公网安备 11010802033920号
EEWORLD
