NCV308 Low Quiescent Current, Programmable Delay Time, Supervisory Circuit The NCV308 series is one of the ON Semiconductor Supervisory circuit IC families. It is optimized to monitor system voltages from www.onsemi.com 0.405 V to 5.5 V, asserting an active low opendrain RESET output, together with Manual Reset (MR) Input. The part comes with both fixed and externally adjustable versions. MARKING DIAGRAM Features Wide Supply Voltage Range 1.6 to 5.5 V TSOP6 XXXAYW Very Low Quiescent Current 1.6 A CASE 318G 1 Fixed Threshold Voltage Versions for Standard Voltage Rails 1 Including 1.8 V, 3.3 V, 5.0 V XXX = Specific Device Code Adjustable Version with Low Threshold Voltage 0.405 V (min) A =Assembly Location High Threshold Voltage Accuracy: 0.15% typ Y = Year Support Manual Reset Input ( MR) W = Work Week = PbFree Package OpenDrain RESET Output (Pushpull Output upon Request) (Note: Microdot may be in either location) Flexible Delay Time Programmability: 1.25 ms to 10 s Temperature Range: 40C to +125C Small TSOP6 PbFree Package ORDERING INFORMATION NCV Prefix for Automotive and Other Applications Requiring See detailed ordering, marking and shipping information in the ordering information section on page 9 of this data sheet. Unique Site and Control Change Requirements AECQ100 Grade 1 Qualified and PPAP Capable These are PbFree Devices Typical Applications DSP or Microcontroller Applications Notebook/Desktop Computers PDAs/HandHeld Products Portable/BatteryPowered Products FPGA/ASIC Applications VIN VDD VIN VDD NCV308SNADJ Rpullup Rpullup RESET RESET RESET RESET VDD VDD DSP/ DSP/ R1 Processor Processor SENSE CT SENSE CT CT CT 1 nF R2 MR MR (Optional) (Optional) (Optional) MR GND MR GND Figure 1. Typical Application Circuit for Adjustable Figure 2. Typical Application Circuit for Fixed Versions Versions Semiconductor Components Industries, LLC, 2018 1 Publication Order Number: June, 2019 Rev. 0 NCV308/DNCV308 VDD VDD VDD NCV308SNADJ VDD NCV308SNXXX Adjustable Version Fixed Versions CT 90k CT 90k MR MR RESET RESET SENSE SENSE Control Logic Control Logic and Timer and Timer + + R1 Vref Vref R2 Figure 3. Functional Block Diagrams of Adjustable and Fixed Versions RESET 1 6 VDD GND 2 5 SENSE 3 CT 4 MR Figure 4. Pin Connections Diagram (Top View) Table 1. PIN OUT DESCRIPTION Name Pin Number Description VDD 6 Supply Voltage. A 0.1uF ceramic capacitor placed close to this pin is helpful for transient and parasitic. SENSE 5 Sense Input, this is the voltage to be monitored. If the voltage at this terminal drops below the threshold voltage V , then RESET is asserted. SENSE does not necessary monitor VDD, it can monitor any voltage IT lower than VDD. CT 4 Reset Delay Time Setting Pin. Connecting this pin to VDD through a 40 k to 200 k resistor or leaving it open results in fixed reset delay times. Connecting this pin to a ground referenced capacitor ( 100 pF) gives a userprogrammable reset delay time. See the Setting Reset Delay Time section for more information. MR 3 Manual Reset input, MR low asserts RESET. MR is internally tied to VDD by a 90 k pullup Resistor. RESET 1 RESET Output, is an Active low open drain NChannel MOSFET output, it is driven to a low impedance state when RESET is asserted (either the SENSE input is lower than the threshold voltage (V ) or the MR IT pin is set to a logic low). RESET will keep low (asserted) for the reset delay time after both SENSE is above V and MR is set to a logic high. A pullup resistor from 10k to 1M should be used on this pin. See IT Figure 5 for behavior of RESET depends on VDD, SENSE and MR conditions. GND 2 Ground terminal. Should be connected to PCB ground reference www.onsemi.com 2 GND GND