LTC1694-1 Datasheet | Linear Technology

LTC1694-1 SMBus/I2C Accelerator Features s s DESCRIPTIO s s s s Improves SMBus/I2CTM Rise Time Transition Ensures Data Integrity with Multiple Devices on the SMBus/I2C Improves Low State Noise Margin Wide Supply Voltage Range: 2.7V to 6V Tiny 5-Pin SOT-23 Package Parallel Multiple LTC1694-1 Devices for Increased Drive 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 LTC®1694-1 is a dual SMBus active pull-up designed to enhance data transmission speed and reliability under all specified SMBus loading conditions. The LTC1694-1 is also patible with the Philips I2C Bus. The LTC1694-1 allows multiple device connections or a longer, more capacitive interconnect, without promising slew rates or bus performance, by supplying a high pull-up current of 2.2m A to slew the SMBus or I2C lines during positive bus transitions During negative transitions or steady DC levels, the LTC1694-1 sources zero current. External resistors, one on each bus line, trigger the LTC1694-1 during positive bus transitions and set the pull-down current level. These resistors determine the slew rate during negative bus transitions and the logic low DC level. The LTC1694-1 is available in a 5-pin SOT-23 package. , 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 1 VCC 2 GND SMBus2 SMBus1 LTC1694-1 VCC 5V parison of SMBus Waveforms for the LTC1694-1 vs Resistor Pull-Up RP1 RP2 SCL SMBus SDA LTC1694-1 1V/DIV CLK IN CLK OUT DEVICE 1 DATA IN DATA OUT CLK IN CLK OUT DEVICE N DATA IN DATA OUT VCC = 5V CLD = 200p F f SMBus = 100k Hz 1µs/DIV 1694-1 TA02 1694-1 TA01 LTC1694-1: Patent Pending RPULL-UP =...