LTC1694 Datasheet | Linear Technology

LTC1694 SMBus/I2C Accelerator Features s s DESCRIPTIO s s s s Improves SMBus Rise Time Transition Ensures Data Integrity with Multiple Devices on the SMBus Improves Low State Noise Margin Auto Detect Low Power Standby Mode Wide Supply Voltage Range: 2.7V to 6V Tiny 5-Pin SOT-23 Package U APPLICATIO S s s s s s s Notebook and Palmtop puters Portable Instruments Battery Chargers Industrial Control Application TV/Video Products ACPI SMBus Interface The LT C®1694 is a dual SMBus active pull-up designed to enhance data transmission speed and reliability under all specified SMBus loading conditions. The LTC1694 is also patible with the Philips I2CTM Bus. The LTC1694 allows multiple device connections or a longer, more capacitive interconnect, without promising slew rates or bus performance, by using two bilevel hysteretic current source pull-ups. During positive bus transitions, the LTC1694 current sources provide 2.2m A to quickly slew the SMBus line. During negative transitions or steady DC levels, the current sources decrease to 275µA to improve negative slew rate and improve low state noise margins. An auto detect standby mode reduces supply current if both SCL and SDA are high. The LTC1694 is available in a 5-pin SOT-23 package, requiring virtually the same space as two surface mount resistors. , LTC and LT are registered trademarks of Linear Technology Corporation. I2C is a trademark of Philips Electronics N.V. TYPICAL APPLICATIO VCC 5V C1 0.1µF parison of SMBus Waveforms for the LTC1694 vs Resistor Pull-Up 1 VCC 2 GND SMBus2 SMBus1 LTC1694 4 5 SCL SMBus SDA 1V/DIV DATA IN DATA OUT CLK IN CLK OUT DEVICE N 1694 TA01 CLK IN CLK OUT DEVICE 1 DATA IN DATA OUT VCC = 5V CLD = 200p F f SMBus = 100k Hz LTC1694: Patent Pending RPULL-UP = 15.8k 1µs/DIV 1694 TA02 ABSOLUTE (Note 1) AXI U RATI GS U U W PACKAGE/ORDER I FOR ATIO TOP VIEW VCC 1 GND 2 NC 3 4 SMBus2 5 SMBus1 Supply Voltage (VCC) .......................................