LTC4311 2 Low Voltage I C/SMBus Accelerator FEATURES DESCRIPTION 2 2 Improves I C Bus Rise Time Transition The LTC 4311 is a dual I C active pull-up designed to Ensures Data Integrity with Multiple Devices on the enhance data transmission speed and reliability for bus 2 2 I C Bus. loading conditions well beyond the 400pF I C speci cation Wide Supply Voltage Range: 1.6V to 5.5V limit. The LTC4311 operates at supply voltages from 1.6V Improves Low State Noise Margin to 5.5V and is also compatible with SMBus. Up to 400kHz Operation The LTC4311 allows multiple device connections or a lon- Auto Detect Low Power Standby Mode ger, more capacitive interconnect, without compromising Low (<5A) Supply Current Shutdown slew rates or bus performance, by using two slew limited Does Not Load Bus When Disabled or Powered Down pull-up currents. Strong Slew Limited Pull-up Current During positive bus transitions, the LTC4311 provides slew 8kV Human Body Model ESD Ruggedness 2 limited pull-up currents to quickly slew the I C or SMBus 2mm 2mm DFN and SC70 Packages lines to the bus pull-up voltage. During negative transitions or steady DC levels, the currents are disabled to improve APPLICATIONS negative slew rate, and improve low state noise margins. An auto detect standby mode reduces supply current if Notebook and Palmtop Computers both SCL and SDA are high. When disabled, the LTC4311 Portable Instruments goes into low (<5A) current shutdown. Battery Chargers Industrial Controls The LTC4311 is available in the 2mm 2mm 0.75mm TV/Video Products DFN, and SC70 packages. ACPI SMBus Interface , 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 and 6650174. TYPICAL APPLICATION 2 Comparison of I C Waveforms for the LTC4311 vs Resistor Pull-Up V V CC CC LTC4311 2.5V 2.5V V BUS1 CC C1 ENABLE 0.01F 10k 10k GND BUS2 2 I C 1V/DIV LTC4311 SCL SDA CLK DATA CLK DATA IN IN IN IN R = 15.8k PULL-UP CLK DATA CLK DATA OUT OUT OUT OUT 4311 TA01b V = 5V 1s/DIV CC C = 200pF LD DEVICE 1 DEVICE N 2 f = 100kHz I C 4311 TA01a 4311fa 1LTC4311 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Storage Temperature Range (DFN) ........65C to 125C V to GND .................................................... 0.3 to 6V CC Storage Temperature Range (SC70).......65C to 125C BUS1, BUS2, ENABLE Inputs ......................... 0.3 to 6V Lead Temperature (Soldering 10, sec) Operating Temperature SC70 ............................................................ 300C LTC4311C ................................................ 0C to 70C LTC4311I..............................................40C to 85C PIN CONFIGURATION TOP VIEW TOP VIEW ENABLE 1 6 GND V 1 6 BUS1 CC NC 2 7 5 BUS2 GND 2 5 GND V 3 4 BUS1 ENABLE 3 4 BUS2 CC SC70 PACKAGE DFN PACKAGE 6-LEAD PLASTIC SC70 6-LEAD (2mm s 2mm) PLASTIC DFN T = 125C, = 150 C/W JMAX JA T = 125C, = 102C/W JMAX JA EXPOSED PAD (PIN 7) PCB CONNECTION TO GND IS OPTIONAL (Note 3) ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4311CDC TRMPBF LTC4311CDC TRPBF LCNG 0C to 70C 6-Lead (2mm 2mm) Plastic DFN LTC4311IDC TRMPBF LTC4311IDC TRPBF LCNG 40C to 85C 6-Lead (2mm 2mm) Plastic DFN LTC4311CSC6 TRMPBF LTC4311CSC6 TRPBF LCNF 0C to 70C 6-Lead (2mm 2mm) Plastic SC70 LTC4311ISC6 TRMPBF LTC4311ISC6 TRPBF LCNF 40C to 85C 6-Lead (2mm 2mm) Plastic SC70 TRM = 500 pieces. *Temperature grades are identi ed by a label on the shipping container. Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on lead based nish parts. For more information on lead free part marking, go to: