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LP3944 数据表(PDF) 5 Page - National Semiconductor (TI) |
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LP3944 数据表(HTML) 5 Page - National Semiconductor (TI) |
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5 / 12 page ![]() Electrical Characteristics (Continued) Unless otherwise noted, V DD = 5.5V. Typical values and limits appearing in normal type apply for TJ = 25˚C. Limits appearing in boldface type apply over the entire junction temperature range for operation, T J = −40˚C to +125˚C. (Note 5) Symbol Parameter Conditions Typical Limit Units Min Max I 2C INTERFACE (SCL AND SDA PINS) t CLK-LP CLK Low Period (Note 7) 1.3 µs t CLK-HP CLK High Period (Note 7) 0.6 µs t SU Set-Up Time Repeated START Condition (Note 7) 0.6 µs t DATA-HOLD Data Hold Time (Note 7) 300 ns t DATA-SU Data Set-Up Time (Note 7) 100 ns t SU Set-Up Time for STOP Condition (Note 7) 0.6 µs t TRANS Maximum Pulse Width of Spikes that Must Be Suppressed by the Input Filter of Both DATA & CLK Signals (Note 7) 50 ns Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: All voltages are with respect to the potential at the GND pin. Note 3: The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formula P= (TJ —TA)/θJA, (1) where TJ is the junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. The 1.76W rating appearing under Absolute Maximum Ratings results from substituting the Absolute Maximum junction temperature, 150˚C, for TJ, 85˚C for TA, and 37˚C/W for θJA. More power can be dissipated safely at ambient temperature below 85˚C. Less power can be dissipated safely at ambient temperatures above 85˚C. The Absolute Maximum power dissipation can be increased by 27 mW for each degree below 85˚C, and it must be de-rated by 27 mW for each degree above 85˚C. For Operating Ratings maximum power dissipation, TJ = 125˚C and TA = 85˚C Note 4: The human-body model is 100 pF discharged through 1.5 k Ω. The machine model is 0Ω in series with 220 pF. Note 5: Limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production with TJ = 25˚C. All hot and cold limits are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control. Note 6: Each LED pin should not exceed 25 mA and the package should not exceed a total of 200 mA. Note 7: Guaranteed by design. Typical Performance Characteristics Frequency vs. Temp (T A = −40˚C to +85˚C), V DD = 2.3V to 3.0V 20085317 www.national.com 5 |
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