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L9857-TR Datasheet(PDF) 7 Page - STMicroelectronics |
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L9857-TR Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 11 page L9857 Electrical specifications Doc ID 12896 Rev 2 7/11 2.5 Reset functional diagram The diagram is guaranteed for the following condition. VCC = 10 V; VBS = 10 V @ -40 °C, VCC = 17 V; VBS = 17 V @ +25 °C and 125 °C Figure 3. Reset functional diagram tphl Input-to-output turn-off propogation delay (50 % input level to 90% output level) -- 0.1 0.2 μs tphl_res RES-to-output turn-off propogation delay (50% input level to 90% output levels) -- 0.1 0.3 tplh_res RES-to-output turn-on propogation delay (50% input level to 10% output levels) -- 0.1 0.8 Input characteristics VINH High logic level input threshold - 9.5 - - V VINL Low logic level input threshold - - - 6 RIN High logic level input resistance (Pull-down resistor) -60 - 300 k Ω IIN Low logic level input current VIN = 0 - - 5 μA VH_RES High logic level RES input threshold Reset signal comes from a 5 V system! 3.5 - - V VL_RES Low Logic Level RES input threshold R eset signal comes from a 5V system! -- 1.4 RRES High logic level RES input resistance (Pull-down resistor) Reset signal comes from a 5 V system with pull-up resistor 3.8 k Ω to 5 V. (1) 60 - 300 k Ω IRES Low logic level input current VRES = 0 - - 5 μA 1. 4 HS-driver reset- inputs and other IC with their input pull-down resistors are connected in parallel with the RESET wire. The enable input RES- is an active low input, that means a logic low turns the external Power MOSFET off. The input circuitry has to make sure, that the MOSFET is off, when the pin is open or floating. In the application the RES- pin is tied to a bipolar open collector transistor or MOSFET open drain transistor with pull-up resistor 3.8K to +5V together with other RES- inputs of other IC. Table 6. Electrical characteristics (continued) Symbol Parameter Test condition Min. Typ. Max. Unit IN RESET - HO-VS: -40°C HO-VS: 25°C HO-VS: 125°C |
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