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LTC4274 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4274 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 32 page  LTC4290/LTC4271 7 429071f SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS I2C Timing fSCLK Clock Frequency (Note 7) l 1 MHz t1 Bus Free Time Figure 5 (Notes 7, 9) l 480 ns t2 Start Hold Time Figure 5 (Notes 7, 9) l 240 ns t3 SCL Low Time Figure 5 (Notes 7, 9) l 480 ns t4 SCL High Time Figure 5 (Notes 7, 9) l 240 ns t5 SDAIN Data Hold Time Figure 5 (Notes 7, 9) l 60 ns t5 Data Clock to SDAOUT Valid Figure 5 (Notes 7, 9) l 130 ns t6 Data Set-Up Time Figure 5 (Notes 7, 9) l 80 ns t7 Start Set-Up Time Figure 5 (Notes 7, 9) l 240 ns t8 Stop Set-Up Time Figure 5 (Notes 7, 9) l 240 ns tr SCL, SDAIN Rise Time Figure 5 (Notes 7, 9) l 120 ns tf SCL, SDAIN Fall Time Figure 5 (Notes 7, 9) l 60 ns Fault Present to INT Pin Low (Notes 7, 9, 10) l 150 ns Stop Condition to INT Pin Low (Notes 7, 9, 10) l 1.5 µs ARA to INT Pin High Time (Notes 7, 9) l 1.5 µs SCL Fall to ACK Low (Notes 7, 9) l 130 ns ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. AGND – VEE = 54V and VDD – DGND = 3.3V unless otherwise noted. (Notes 3 & 4) Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. With the exception of (VDD – DGND), exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 140ºC when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 3: All currents into device pins are positive; all currents out of device pins are negative. Note 4: The LTC4290 operates with a negative supply voltage (with respect to AGND). To avoid confusion, voltages in this data sheet are referred to in terms of absolute magnitude. Note 5: tDIS is the same as tMPDO defined by IEEE 802.3 Note 6: The LTC4271 digital interface operates with respect to DGND. All logic levels are measured with respect to DGND. Note 7: Guaranteed by design, not subject to test. Note 8: The IEEE 802.3 specification allows a PD to present its Maintain Power Signature (MPS) on an intermittent basis without being disconnected. In order to stay powered, the PD must present the MPS for tMPS within any tMPDO time window. Note 9: Values Measured at VILD and VIHD Note 10: If a fault condition occurs during an I2C transaction, the INT pin will not be pulled down until a stop condition is present on the I2C bus. Note 11: Load characteristics of the LTC4290 during Mark: 7V < (AGND – VOUTn) < 10V or IOUT < 50µA. Note 12: See the LTC4271 Software Programming documentation for information on serial bus usage and device configuration and status registers. Note 13: Do not source or sink current from CAP1 and CAP2. |
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Similar Description - LTC4274 |
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