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LP3939 数据表(PDF) 4 Page - National Semiconductor (TI) |
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LP3939 数据表(HTML) 4 Page - National Semiconductor (TI) |
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4 / 7 page ![]() AC Electrical Characteristics Unless otherwise noted, V DD1 =VDD2 = 3V, CLOAD = 50 pF. 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, −40˚C to +85˚C. (Note 7) Symbol Parameter Conditions Typ Limit Units Min Max t PLH Propagations Delay Low to High EN_CELL to PA_ON or EN_PCS to PA_ON 10 80 ns EN_CELL to CELL_ON or EN_PCS to PCS_ON R PD = 100 Ω 7 56 ns GAIN_MODE to CELL_GAIN or GAIN_MODE to PCS_GAIN R PD = 100 Ω 7 56 ns INV_A1 to INV_Y1 10 80 ns INV_A2 to INV_Y2 25 200 ns t PHL Propagations Delay High to Low EN_CELL to PA_ON or EN_PCS to PA_ON 10 80 ns EN_CELL to CELL_ON or EN_PCS to PCS_ON R PD = 100 Ω 25 200 ns GAIN_MODE to CELL_GAIN or GAIN_MODE to PCS_GAIN R PD = 100 Ω 20 160 ns INV_A1 to INV_Y1 10 80 ns INV_A1 to A1_SINK R PU =10k Ω 5 40 ns INV_A2 to INV_Y2 5 40 ns t RISE Rise Time PA_ON 15 120 ns INV_Y2 50 400 INV_Y1 20 160 T FALL Fall Time PA_ON 15 120 ns INV_Y2 10 80 INV_Y1 20 160 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: where TJ is the junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient temperature. The 2.0W rating appearing under Absolute Maximum Ratings results from substituting the Absolute Maximum junction temperature, 150˚C for TJ, 70˚C for TA and 39.8˚C/W for θJA. More power can be dissipated safely at ambient temperatures below 70˚C. Less power can be dissipated safely at ambient temperatures above 70˚C. The Absolute Maximum power dissipation can be increased by 25 mW for each degree below 70˚C, and it must be derated by 25 mW for each degree above 70˚C. Note 4: The human body model is 100 pF discharged through a 1.5 k Ω resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin. Note 5: Like the Absolute Maximum power dissipation, the maximum power dissipation depends on the ambient temperature. The 1.38W rating appearing under Absolute Maximum Ratings results from substituting the Maximum junction temperature, 125˚C for TJ, 70˚C for TA and 39.8˚C/W for θJA. More power can be dissipated safely at ambient temperatures below 70˚C. Less power can be dissipated safely at ambient temperatures above 70˚C. The Absolute Maximum power dissipation can be increased by 25 mW for each degree below 70˚C, and it must be derated by 25 mW for each degree above 70˚C. Note 6: All limits are guaranteed by testing or statistical analysis. Note 7: All AC parameters are guaranteed by design, not production tested. www.national.com 4 |
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