LTC4312 ELECTRICAL CHARACTERISTICSThe l denotes the specifi cations which apply over the full operatingtemperature range, otherwise specifi cations are at TA = 25°C. VCC = VCC2 = 3.3V unless otherwise noted.SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS ILEAK Input Leakage Current DISCEN = ENABLE1-2 = 5.5V l 0.1 ±10 μA IACC(IN, HL) ACC High, Low Input Current VCC = 5V, VACC = 5V, 0V l ±23 ±40 μA IACC(IN, Z) Allowable Leakage Current in VCC = 5V l ±5 μA Open State IACC(EN, Z) ACC High Z Input Current VCC = 5V l ±5 μA VACC(L, TH) ACC Input Low Threshold VCC = 5V l 0.2•VCC 0.3•VCC 0.4•VCC V Voltages VACC(H,TH) ACC Input High Threshold VCC = 5V l 0.7•VCC 0.8•VCC 0.9•VCC V Voltages Stuck Low Timeout Circuitry tTIMEOUT Bus Stuck Low Timer SDAOUT or SCLOUT < 0.3•VCC l 35 45 55 ms VFAULT(OL) FAULT Output Low Voltage IFAULT = 3mA l 0.4 V IFAULT(OH) FAULT Leakage Current l 0.1 ±5 μA I2C Interface Timing fSCL(MAX) I2C Frequency Max (Note 6) l 400 kHz tPDHL SDA, SCL Fall Delay VCC = 3V to 5.5V, CBUS = 50pF, IBUS = 1mA (Note 6) 60 100 ns tf SDA, SCL Fall Times VCC = 3V to 5.5V, CBUS = 50pF, IBUS = 1mA (Note 6) 10 ns Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 5: VIL is tested for the following (VCC, VCC2) combinations: may cause permanent damage to the device. Exposure to any Absolute (2.9V, 5.5V), (5.5V, 2.25V), (3.3V, 3.3V) and (5V, 0V). Maximum Rating condition for extended periods may affect device Note 6: Guaranteed by design and not tested. reliability and lifetime. Note 7: Measured in a special DC mode with VSDA,SCL = VRTA(TH) + 1V. Note 2: All currents into pins are positive and all voltages are referenced to The transient IRTA seen during rising edges when ACC is low will depend GND unless otherwise indicated. on the bus loading condition and the slew rate of the bus. The LTC4312’s Note 3: SDAIN, SCLIN pulled low. internal slew rate control circuitry limits the maximum bus rise rate to Note 4: V 75V/μs by controlling the transient I MIN = minimum of VCC and VCC2 if VCC2 > 2.25V else VMIN = VCC. RTA. 4312f 4
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