ISL88694IH5

DATASHEET ISL88694 FN8239 Rev.2.00 Jan 25, 2019 SMBus Accelerator (SMA) 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 with the I2C serial bus. 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 (VTRIPL), the boost pull-up current source is activated to speed transition. After the voltage crosses the second threshold (VTRIPH), 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. The level for VTRIPH is controlled by a bandgap voltage referred to VDD. This feature makes the switching behavior invariant for all power supply voltages between 2.7V and 5.5V. Features • Active termination for SMBus lines • Enhances system bus signal rise time • Increases bus capacity while ensuring data integrity • 2.2mA rise time supply current • 8kV ESD protection on SDA and SCL pins • Wide operating voltage range: 2.7V to 5.5V • 2-Wire SMBus and I2C compatible (100kHz) • Small package - SOT23-5 • Pin-for-pin compatible with the LTC1694 • Pb-free available (RoHS compliant) Target Applications • Servers • Data acquisition • Routers 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 VTRIPL by 100Vns (typical) (See Figure 10). • Battery chargers 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. • PC 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 I2C can reliably increase their bus load without the risk of data loss. FN8239 Rev.2.00 Jan 25, 2019 • Portable instrumentation • Notebook • Facilities tracking system Related Literature For a full list of related documents, visit our website: • ISL88694 device page Page 1 of 10 ISL88694 Ordering Information PART NUMBER (Notes 2, 3) PART MARKING (Note 4) TEMP RANGE (°C) TAPE AND REEL (Units) (Note 1) PACKAGE (RoHS Compliant) PKG. DWG. # ISL88694IH5Z-TK AKM -40 to +85 1k 5-pin SOT P5.064 NOTES: 1. See TB347 for details about reel specifications. 2. Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), see the ISL88694 device page. For more information about MSL, see TB363. 4. The part marking is located on the bottom of the part. Pinout 5 LD SOT-23 TOP VIEW VDD 1 GND 2 N.C. 3 5 SMBus1 4 SMBus2 Pin Descriptions SOT-23 SYMBOL 1 VDD Supply Voltage 2 GND Ground 3 N.C. No Connect 4 SMBus2 Active Pull-Up for SMBus 5 SMBus1 Active Pull-Up for SMBus FN8239 Rev.2.00 Jan 25, 2019 DESCRIPTION Page 2 of 10 ISL88694 System Diagram ISL88694 VDD SMBus1 SMBus2 GND BUS SIGNALS DATA CLK Devices; SBS, PCI, Compact PCI, PMCI, ACPI, ICMB, IPMI, IPMB,SMBus, I2C, 2-Wire. DATA IN CLK IN CLK OUT CLK IN CLK OUT DATA OUT Device 1 DATA IN DATA OUT Device N IC Block Diagram VDD 1.825mA 175µA 100µA VTRIPH = VDD-0.5V SMBus1 + Control VTRIPL= 0.75V VTRIPH = VDD-0.5V + + SMBus2 Control 8kV ESD Protection 0.75V 8kV ESD Protection VTRIPL= + 1.825mA 175µA 100µA VDD FN8239 Rev.2.00 Jan 25, 2019 GND Page 3 of 10 ISL88694 Absolute Maximum Ratings Recommended Operating Conditions Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . -1V to 6.5V Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +135°C Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C Voltage on pins . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VDD+0.3V Lead temperature (soldering, 10 seconds) . . . . . . . . . . . . . . . 300°C ESD min other pins (HBM). . . . . . . . . . . . . . . . . . . . . . . . . . . . .>2kV ESD SMBus1 and SMBus2 pins (HBM) . . . . . . . . . . . . . . . . . .>8kV Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V CAUTION: Absolute Maximum Ratings indicate limits beyond which permanent damage to the device and impaired reliability can occur. These are stress ratings provided for information only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification are not implied. For assured specifications and test conditions, see Electrical Specifications. The assured specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Electrical Specifications PARAMETER Over operating conditions unless otherwise specified, Typical values are measured at VDD = 3.3V and TA = +25°C SYMBOL CONDITIONS MIN TYP MAX UNIT ANALOG PARAMETERS Supply Voltage Range VDD Ramp Rate Supply Current VDD 2.7 5.5 V VDD RAMP 0.05 50 V/msec IDD SMBus1 = SMBus2 = Open 80 100 µA 80 125 µA Standby Pull-Up Current IOUT_SB SMBus1 = SMBus2 = VDD-1.0V Active Pull-Up Current IOUT_A1 SMBus1 = GND; SMBus2 = Open 125 275 350 µA IOUT_A2 SMBus1 = Open; SMBus2 = GND 125 275 350 µA IOUT_B1 VTRIPL