LTC4315: 2-Wire Bus Buffer with High Noise Margin Data Sheet10/11/2011275K
Features and Benefits
- Bidirectional Buffer Increases Fanout
- High Noise Margin with VIL = 0.3 • VCC
- Compatible with Non-Compliant I2C Devices That Drive a High VOL
- Selectable Rise Time Accelerator Current
- Level Shift 1.5V, 1.8V, 2.5V, 3.3V and 5V Busses
- Prevents SDA and SCL Corruption During Live Board Insertion and Removal from Backplane
- Stuck Bus Disconnect and Recovery
- Compatible with I2C, I2C Fast Mode and SMBus
- ±4kV Human Body Model ESD Ruggedness
- High Impedance SDA, SCL pins When Unpowered
- 12-Lead (4mm × 3mm) DFN and 12-Lead MSOP Packages
The LTC4315 is a hot-swappable 2-wire bus buffer that provides bidirectional buffering, while maintaining a low offset voltage and high noise margin up to 0.3 • VCC. The high noise margin allows the LTC4315 to be interoperable with devices that drive a high VOL (>0.4V) and allows multiple LTC4315s to be cascaded. The LTC4315 supports level translation between 1.5V, 1.8V, 2.5V, 3.3V and 5V busses.
During insertion, the SDA and SCL lines are precharged to 1V to minimize bus disturbances. Connection is established between the input and output after ENABLE is asserted high and a stop bit or bus idle condition has been detected on the SDA and SCL pins.
If both data and clock are not simultaneously high at least once in 45ms and DISCEN is high, a FAULT signal is generated indicating a stuck bus low condition and the input is disconnected from the output. Up to 16 clock pulses are subsequently generated to free the stuck bus. A three state ACC pin enables input and output side rise time accelerators of various strengths.
- Capacitance Buffers/Bus Extender
- Live Board Insertion
- Telecommunications Systems Including ATCA
- Level Translation
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
R557 Reliability Data3/23/201829 K
Serial Bus Buffers, Extenders, and Accelerators7/13/2017823 K
I2C Quick Guide7/13/20171M
Digital Isolation and Interface Technology Selection Guide2/7/20204 M
Bus Buffers Simplify Design of Large, Noisy I2C Systems1/1/2013 LT Journal
Tools & Simulations
LTC4315 Companion Parts
Recommended µModule Isolator
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Support & Discussions
Sample & Buy
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Please see the latest communication from our CCO regarding lead times.
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.