card insertion into a live backplane without corruption of
the data and clock busses. When a connection is made,
the LTC4303 provides bidirectional buffering, keeping the
backplane and card capacitances isolated. If SDAOUT or
SCLOUT is low for ≥ 30ms (typ), the LTC4303 automatically
breaks the data and clock bus connection. At this time the
LTC4303 automatically generates up to 16 clock pulses on
SCLOUT in an attempt to free the bus. A connection will
be enabled automatically when the bus becomes free.
Rise-time accelerator circuitry allows the use of larger pull-
up resistance while still meeting rise-time requirements.
During insertion, the SDA and SCL lines are precharged
to 1V to minimize bus disturbances. When driven high,
ENABLE allows the LTC4303 to connect after a stop bit or
bus idle occurs. Driving ENABLE low breaks the connection
between SDAIN and SDAOUT, SCLIN and SCLOUT. READY
is an open drain output that indicates when the backplane
and card sides are connected together.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6356140, 6650174, 7032051.
■
■
■
■
■
■
■
■
■
■
Automatic Disconnect of SDA/SCL Lines when Bus
is Stuck Low for ≥ 30ms
Recovers Stuck Busses with Automatic Clocking*
Bidirectional Buffer* for SDA and SCL Lines
Increases Fanout
Prevents SDA and SCL Corruption During Live
Board Insertion and Removal from Backplane
Pin Compatible with LTC4300A-1
±15kV Human Body Model ESD Protection
Isolates Input SDA and SCL Lines from Output
Compatible with I
2
C
TM
, I
2
C Fast-Mode and SMBus
Standards (Up to 400kHz Operation)
READY Open Drain Output
1V Precharge on All SDA and SCL Lines
High Impedance SDA, SCL Pins for V
CC
= 0V
ENABLE Gates Connection from Input to Output
MSOP 8-Pin and DFN (3mm
×
3mm) Packages
Hot Board Insertion
Servers
Capacitance Buffer/Bus Extender
RAID Systems
APPLICATIO S
■
■
■
■
TYPICAL APPLICATIO
5V 3.3V
10k
BACK_SCL
10k
0.01
m
F
10k
V
CC
LTC4303
SCLIN
SCLOUT
CARD_SCL
SDAOUT
5V/DIV
10k
SDAIN
BACK_SDA
SDAOUT
CARD_SDA
SDAIN
5V/DIV
AUTOMATIC CLOCKING
3.3V
100k
ENABLE
GND
READY
4303
TA01
SCLOUT
5V/DIV
4303 TA01b
BACKPLANE
CONNECTOR
STAGGERED
CONNECTOR
CARD
U
U
U
Stuck Bus Resolved
with Automatic Clocking
STUCK LOW > 30ms
RECOVERS
DISCONNECT AT TIMEOUT
200
m
s/DIV
4303fb
1
LTC4303
ABSOLUTE
AXI U RATI GS
V
CC
to GND .................................................. –0.3V to 7V
SDAIN, SCLIN, SDAOUT, SCLOUT,
READY, ENABLE ........................................... –0.3V to 7V
Operating Temperature
LTC4303C ................................................ 0°C to 70°C
LTC4303I .............................................–40°C to 85°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ENABLE 1
SCLOUT 2
SCLIN 3
GND 4
9
8
7
6
5
V
CC
SDAOUT
SDAIN
READY
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 9)
PCB CONNECTION OPTIONAL
ORDER PART NUMBER
LTC4303CDD
LTC4303IDD
DD PART MARKING*
LBPZ
Order Options
Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS
SYMBOL
Power Supply
V
CC
I
CC
Startup Circuitry
V
PRE
T
IDLE
V
OL_READY
V
THR_ENABLE
I
ENABLE
V
THR
PARAMETER
Positive Supply Voltage
Supply Current
Supply Current, ENABLE = GND
Precharge Voltage
Bus Idle Time
READY Output Low Voltage
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, unless otherwise noted.
CONDITIONS
●
V
CC
= 5.5V, V
SDAIN
= V
SDAOUT
= 0V (Note 7)
V
CC
= 5.5V
SDA, SCL Floating, V
CC
= 5.5V
I
PULLUP
= 3mA
I
PULLUP
= 6mA, V
CC
= 4.7V
ENABLE Threshold
ENABLE Input Current
ENABLE from 0 to V
CC
SDA, SCL Logic Input Threshold Voltage Rising Edge
[i=s]This post was last edited by LS_lpy on 2014-1-14 17:59[/i] Upper computer interfaceUpper computer UDP server C# code[code]using System; using System.Collections.Generic; using System.ComponentMod...
I have a small program that needs a function to return a value, but after returning the value, the function has to perform certain operations before it can exit, and I don't want to use global variabl...
The equipment in the factory is very old, and the software of the equipment itself is also relatively old. Now the hardware in the market is updated very quickly, but the software does not support the...
[b][color=#ff0000]1.通过MEMORY伪指令来指示存储空间[/color][/b]
MEMORY
{PAGE 0:/* Program Memory */[color=#ff0000]/* 程序存储空间 */[/color]/* Memory (RAM/FLASH/OTP) blocks can be moved to PAGE1 for data allocation */PR...
As shown in the figure above, the input is 220V AC. After the rectifier bridge, the voltage across the 47uF capacitor is 318V, which is fine. The TNY277PN BP/M power supply is 5.80V, which is also fin...
[font=宋体]There are still 4 days left until 2017. EEWorld just gave me such a good event. It is really a good choice to summarize my 2016. [/font] [font=宋体]I changed my job in 2016. I started from soft...
1. Several nouns
ABI:
The specifications that an executable file must follow in order to run in a specific execution environment;
Separately generated relocatabl...[Details]
Most of the houses we live in now are elevator buildings, mainly because it is more convenient to go up and down the stairs! It can also make life more comfortable. It even helps to increase the ad...[Details]
To understand why car engines need gearboxes, we must first understand the characteristics of different types of engines. An engine refers to a machine that can convert a form of energy into kineti...[Details]
Whether it is an electric car or an ordinary fuel car, for the vast majority of car buyers, the final cost of use is what they care about most. For fuel cars, how to save fuel is what drivers care ...[Details]
In recent years, with the application of the IEC61850 standard and the development and deployment of optoelectronic transformers, the concept of digital substations has been put into practical use ...[Details]
Limited vocabulary recognition
According to the number of characters, words or short sentences in the vocabulary, it can be roughly divided into: less than 100 is small vocabulary; 100-1000 is...[Details]
On August 22nd, Lantu Motors unveiled a new technology called "Lanhai Intelligent Hybrid" during a live broadcast of CCTV News' "Top Laboratory." The name sounds like another new term, but a closer...[Details]
On August 20th, Tiantai Robotics Co., Ltd., along with strategic partners including Shandong Future Robotics Technology Co., Ltd., Shandong Future Data Technology Co., Ltd., and Gangzai Robotics Gr...[Details]
Since the beginning of this year, price wars have intensified, new models have been launched one after another, used cars with zero kilometers have become a hot topic, and the industry's internal c...[Details]
On August 22, according to the Ministry of Industry and Information Technology's official website, my country's first mandatory national standard for the control of hazardous substances in electric...[Details]
While the current industry consensus is that autonomous vehicles are robots and that their systems are managed using robotics-developed thinking, there are also cases where autonomous driving is ac...[Details]
Tires are a very important component for cars. They are related to the driving experience of the vehicle. We are almost inseparable from cars in our daily lives. For tires, according to the role of...[Details]
SMT placement machines are important equipment in surface mount technology (Surface Mount Technology). Their performance has a decisive impact on the quality and efficiency of electronic manufactur...[Details]
Through AI connection technology supported by Qualcomm X85 5G modem and RF and Qualcomm FastConnect 7900 mobile connection system, seamless switching can be achieved between cellular net...[Details]
Reflow soldering, as an electronics assembly process, has become a vital component of the electronics manufacturing industry. Choosing reflow soldering equipment is crucial for improving production...[Details]
ARM Technology
京公网安备 11010802033920号
EEWORLD
