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 am a novice and want to transplant the system on ARM. I want to choose between uclinux and ucosII to learn. I personally want to study uclinux, but I am a hardware major. I have some knowledge of AR...
[i=s]This post was last edited by Blue Rain Night on 2014-12-9 23:22[/i] [Nucleo+BLUENRG Experience] +BLUENRG Control the small wheel forward and reverse hardware introduction Use l053's PB10, PA2, PB...
The lack of unified management in the field of SMS addressing has led to vicious competition in the industry. The relevant departments of the national government are about to issue industry standards ...
After calculation, 3.3V voltage is enough to drive LCD12864, and it can display English and Chinese successfully. But how to display graphics? Who has written the driver? Please guide me. Thank you!...
The course of single-chip microcomputer application system is one of the main courses of electrical majors at present. It is very practical. For college students, classroom teaching alone is far from ...
[i=s] This post was last edited by 想得明明 on 2018-12-23 18:44 [/i] It is understandable that the headphone impedance is 15Ω and connected in parallel with 0.1uf, but the LINEOUT line output impedance is...
1. Equipment Overview
Shell-and-tube heat exchangers are a common heat exchange device used in chemical evaporation and heating equipment. Currently, the tubesheets of shell-and-tube heat exch...[Details]
Tesla and BYD, vying for dominance in the global electric vehicle market, are reportedly considering adopting Samsung's AMOLED (active-matrix organic light-emitting diode) technology for their next...[Details]
introduction
With the development of digital and network technologies, broadcasting technology has become increasingly diversified, with the most significant trend being the transition from an...[Details]
"Have you set your calendar reminder?"
On August 24, Nvidia Robotics' official account posted a photo of a black gift box on a social media platform, with an attached greeting card sig...[Details]
Today's security industry has entered the era of massive networking. Many enterprises, especially financial institutions, have established multi-level video surveillance networking platforms. Lever...[Details]
Recently,
Xpeng Motors and Xinlian Integrated Circuit jointly announced the mass production of China's first hybrid silicon carbide product.
Designed and developed by Xpeng Motors and joint...[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 22, Lantu Motors officially launched its Lanhai Intelligent Hybrid technology via an online livestream. This intelligent hybrid technology, which integrates a full-range 800V high-voltage...[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]
The automotive industry in 2025 is undergoing a thorough intelligent reshuffle.
Geely wants to make changes in the field of AI cockpits: in the future, there will be no traditional smart...[Details]
Since its invention in the mid-1940s, the microwave oven has evolved from a humble beginning to commercial use, entering homes in the 1960s and rapidly gaining popularity. Its basic functionality a...[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]
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]
The 2025 China International Automotive Testing Exhibition will be held at the Shanghai World Expo Exhibition and Convention Center from August 27 to 29, 2025.
Clacton Seafront, UK, ...[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]
Linux and Android
京公网安备 11010802033920号
EEWORLD
