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NCP308MT330TBG Datasheet(PDF) 2 Page - ON Semiconductor |
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NCP308MT330TBG Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 11 page NCP308, NCV308 www.onsemi.com 2 VDD SENSE − Vref + Control Logic and Timer CT 90k VDD Adjustable Versions NCP308SNADJ/NCP308MTADJ SENSE VDD − Vref + CT Control Logic and Timer 90k VDD NCP308SNXXX/NCP308MTXXX Fixed Versions R1 R2 Figure 3. Functional Block Diagrams of Adjustable and Fixed Versions MR RESET MR RESET Figure 4. Pin Connections Diagram (Top View) 1 2 3 6 5 4 GND VDD SENSE CT RESET MR 1 2 3 6 5 4 VDD SENSE CT RESET MR GND Table 1. PIN OUT DESCRIPTION Name Pin Number Description TSOP−6 WDFN6 VDD 6 1 Supply Voltage. A 0.1uF ceramic capacitor placed close to this pin is helpful for transient and parasitic. SENSE 5 2 Sense Input, this is the voltage to be monitored. If the voltage at this terminal drops below the threshold voltage VIT, then RESET is asserted. SENSE does not necessary monitor VDD, it can monitor any voltage lower than VDD. CT 4 3 Reset Delay Time Setting Pin. Connecting this pin to VDD through a 40 k W to 200 kW resistor or leaving it open results in fixed reset delay times. Connecting this pin to a ground referenced capacitor ( ≥ 100 pF) gives a user−programmable reset delay time. See the Setting Reset Delay Time section for more information. MR 3 4 Manual Reset input, MR low asserts RESET. MR is internally tied to VDD by a 90 k W pull−up Resistor. RESET 1 6 RESET Output, is an Active low open drain N−Channel MOSFET output, it is driven to a low impedance state when RESET is asserted (either the SENSE input is lower than the threshold voltage (VIT) or the MR pin is set to a logic low). RESET will keep low (asserted) for the reset delay time after both SENSE is above VIT and MR is set to a logic high. A pull−up resistor from 10k W to 1MW should be used on this pin. See Figure 5 for behavior of RESET depends on VDD, SENSE and MR conditions. GND 2 5 Ground terminal. Should be connected to PCB ground reference EXP PAD − Exposed Pad Exposed pad, under WDFN6 package, connect it to ground plane for better thermal dissipation. |
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