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LTC2972 Datasheet(PDF) 9 Page - Linear Technology |
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LTC2972 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 112 page  LTC2972 9 2972fa For more information www.linear.com/LTC2972 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS tSP Pulse Width of Spike Suppressed FAULTB0, FAULTB1, CONTROLn 10 µs SDA, SCL 98 ns tFAULT_MIN Minimum Low Pulse Width for Externally Generated Faults 180 ms tRESETB Pulse Width to Assert Reset VWDI/RESETB ≤ 1.5V l 300 µs tWDI Pulse Width to Reset Watchdog Timer VWDI/RESETB ≤ 1.5V l 0.3 200 µs fWDI Watchdog Timer Interrupt Input Frequency l 1 MHz CIN Input Capacitance 10 pF Digital Input SHARE_CLK VIH High Level Input Voltage l 1.6 V VIL Low Level Input Voltage l 0.8 V fSHARE_CLK_IN Input Frequency Operating Range l 90 110 kHz tLOW Assertion Low Time VSHARE_CLK < 0.8V l 0.825 1.11 µs tRISE Rise Time VSHARE_CLK < 0.8V to VSHARE_CLK > 1.6V l 450 ns ILEAK Input Leakage Current 0V ≤ VSHARE_CLK ≤ VDD33 + 0.3V l ±1 µA CIN Input Capacitance 10 pF Digital Outputs SDA, ALERTB, SHARE_CLK, FAULTB0, FAULTB1, PWRGD, PG0, PG1 VOL Digital Output Low Voltage ISINK = 3mA l 0.4 V fSHARE_CLK_OUT Output Frequency Operating Range 5.49kΩ Pull-Up to VDD33 l 90 100 110 kHz Digital Inputs ASEL0,ASEL1 VIH Input High Threshold Voltage l VDD33 – 0.5 V VIL Input Low Threshold Voltage l 0.5 V IIH,IL High, Low Input Current ASEL[1:0] = 0, VDD33 l ±95 µA IHIZ Hi-Z Input Current l ±24 µA CIN Input Capacitance 10 pF Serial Bus Timing Characteristics fSCL Serial Clock Frequency (Note 13) l 10 400 kHz tLOW Serial Clock Low Period (Note 13) l 1.3 µs tHIGH Serial Clock High Period (Note 13) l 0.6 µs tBUF Bus Free Time Between Stop and Start (Note 13) l 1.3 µs tHD,STA Start Condition Hold Time (Note 13) l 600 ns tSU,STA Start Condition Setup Time (Note 13) l 600 ns tSU,STO Stop Condition Setup Time (Note 13) l 600 ns tHD,DAT Data Hold Time (LTC2972 Receiving Data) (Note 13) l 0 ns Data Hold Time (LTC2972 Transmitting Data) (Note 13) l 300 900 ns tSU,DAT Data Setup Time (Note 13) l 100 ns The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. VPWR = VIN_SNS = 12V, VDD33 = VDDIO, VDD33, VDD25, REFP and REFM pins floating, unless otherwise indicated. CVDD33 = 100nF, CVDD25 = 100nF, CVIN_SNS_CAP = 10nF and CREF = 100nF. (Note 2) ELECTRICAL CHARACTERISTICS |
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