Renesas Electronics Corporation SMBus Accelerator (SMA) ISL88694IH5Z-TK

The ISL88694 SMBus accelerator (SMA) is a dual active pull-up bus terminator designed to improve data transmission speed on SMBus or similar 2-wire serial bus interfaces. The ISL88694 is also compatible to the Isup2/supC serial bus.brbr The SMA detects rising input transitions with two internal voltage references and two comparators per channel. After the voltage on a data line crosses the first threshold (VsubTRIPL/sub), the boost pull-up current source is activated to speed transition. After the voltage crosses the second threshold (VsubTRIPH/sub), the boost pull-up current source is deactivated, leaving an active pull-up current of 275µA on the line. When both channels are HIGH, the pull-up current for both lines is reduced to 100µA to save power. Internal logic ensures that the active and boost pull-up current sources are not activated during downward transitions.brbr The level for VsubTRIPH/sub is controlled by a bandgap voltage referred to VsubDD/sub. This feature makes the switching behavior invariant for all power supply voltages between 2.7V and 5.5V.brbr A noise filter on each channel prevents the circuit from responding to input transitions that do not exceed a voltagetime threshold. To activate the boost circuit, the input must exceed VsubTRIPL/sub by 100Vns (typical).brbr The SMA permits operation of the bus at frequencies up to 100kHz, despite the capacitive loads of multiple devices and/or long PC board traces. Enhanced ESD protection on the accelerator pins are guaranteed to withstand 8kV ESD (HBM) events.brbr The SMBus Accelerator provides an essential function in SMBus applications because of distributed capacitance of SMBus and multiple device input capacitances at various nodes. By incorporating SMA, systems using SMBus or Is

IC ACCELERATOR I2C 2CH SOT-5

Accelerator 2 Channel SOT-23-5