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RT9807 Datasheet(PDF) 3 Page - Richtek Technology Corporation |
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RT9807 Datasheet(HTML) 3 Page - Richtek Technology Corporation |
3 / 7 page RT9807 3 DS9807-01 April 2011 www.richtek.com Electrical Characteristics (TA = 25 °C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Operating VDD Range VDD 0.9 -- 5.5 V Supply Current IDD VTH = 3V, VDD = 4.5V -- 3 5 μA Reset Threshold VTH 1.2 -- 3.3 V Threshold Voltage Accuracy ΔVTH −1.5 -- 1.5 % Threshold Voltage Hysteresis VHYS -- 50 x VTH -- mV Reset Threshold Tempco -- 100 -- ppm/ °C VDD Drop to Reset Delay tRP Drop = VTH – 250mV -- 100 -- μs RST Output Voltage Low (Note 5) VOL VDD < VTH(min.), ISINK = 3.5mA -- -- 0.4 V Logic-High VIH 0.7VDD -- -- MR Input Threshold voltage Logic-Low VIL -- -- 0.25VDD V MR Glitch Rejection -- 80 -- ns MR to Reset Propagation Delay tMR -- 2 -- μs MR Pull-up Resistance RMR -- 20 -- k Ω CCT = 1500pF 3.35 4.375 5.40 Reset Timeout Period tRP CCT = 0pF -- 0.275 -- ms CT Source Current IRAMP -- 240 -- nA CT Source Threshold Voltage VTH-RAMP -- 0.65 -- V CT Threshold Hysteresis -- 33 -- mV Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. θJA is measured in natural convection at TA = 25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. The voltage VOL can be calculated by VOL = VDD - Ir x R. Where R is the pull-up resistor and Ir is the current flowing through the pull-up resistor. For typical application R = 100k Ω, VOL is less than 0.2V. |
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