NCP302HSN27T1G

DATA SHEET www.onsemi.com Voltage Detector Series with Programmable Delay MARKING DIAGRAM NCP302, NCP303 5 The NCP302 and NCP303 series are second generation ultra−low current voltage detectors that contain a programmable time delay generator. These devices are specifically designed for use as reset controllers in portable microprocessor based systems where extended battery life is paramount. Each series features a highly accurate undervoltage detector with hysteresis and an externally programmable time delay generator. This combination of features prevents erratic system reset operation. The NCP302 series consists of complementary output devices that are available with either an active high or active low reset. The NCP303 series has an open drain N−Channel output with an active low reset output. Features • • • • • • • • • Quiescent Current of 0.5 mA Typical High Accuracy Undervoltage Threshold of 2.0% Externally Programmable Time Delay Generator Wide Operating Voltage Range of 0.8 V to 10 V Complementary or Open Drain Output Active Low or Active High Reset Specified Over the −40°C to +125°C Temperature Range (Except for Voltage Options from 0.9 to 1.1 V) NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q100 Qualified and PPAP Capable These Devices are Pb−Free and are RoHS Compliant 1 TSOP−5/ SOT23−5 CASE 483 xxx A Y W G = Specific Device Code = Assembly Location = Year = Work Week = Pb−Free Package 5 xxx AYWG G 1 (Note: Microdot may be in either location) PIN CONNECTIONS Reset Output 1 Input 2 Ground 3 5 CD 4 N.C. (Top View) ORDERING INFORMATION See detailed ordering and shipping information in the ordering information section on page 22 of this data sheet. Typical Applications • • • • Microprocessor Reset Controller Low Battery Detection Power Fail Indicator Battery Backup Detection © Semiconductor Components Industries, LLC, 2014 August, 2021 − Rev. 27 1 Publication Order Number: NCP302/D NCP302, NCP303 NCP303LSNxxT1 Open Drain Output Configuration NCP302xSNxxT1 Complementary Output Configuration 2 Input 2 RD Reset Output RD Reset Output * GND 5 1 1 Vref 3 Input Vref CD 3 GND 5 CD * Inverter for active low devices. * Buffer for active high devices. This device contains 28 active transistors. Figure 1. Representative Block Diagrams MAXIMUM RATINGS Rating Symbol Value Unit Vin 12 V Delay Capacitor Pin Voltage (Pin 5) VCD −0.3 to Vin + 0.3 V Output Voltage (Pin 1) Complementary, NCP302 N−Channel Open Drain, NCP303 VOUT Output Current (Pin 1) (Note 2) IOUT 70 mA Thermal Resistance Junction−to−Air RqJA 250 °C/W Maximum Junction Temperature TJ +150 °C Operating Ambient Temperature Range All Voltage Options: 0.9 V to 1.1 V All Voltage Options: 1.2 V to 4.9 V TA TA −40 to +85 −40 to +125 °C °C Storage Temperature Range Tstg −55 to +150 °C MSL 1 Input Power Supply Voltage (Pin 2) Moisture Sensitivity Level Latchup Performance (Note 3) Positive Negative ILATCHUP −0.3 to Vin + 0.3 −0.3 to 12 200 200 V mA Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 1. This device series contains ESD protection and exceeds the following tests: Human Body Model 2000 V per MIL−STD−883, Method 3015. Machine Model Method 200 V. 2. The maximum package power dissipation limit must not be exceeded. P D + T *T J(max) A R qJA 3. Maximum ratings per JEDEC standard JESD78. www.onsemi.com 2 NCP302, NCP303 ELECTRICAL CHARACTERISTICS (For all values TA = −40°C to +125°C, unless otherwise noted.) Characteristic Symbol Min Typ Max Unit Detector Threshold (Pin 2, Vin Decreasing) VDET− 0.882 0.900 0.918 V Detector Threshold Hysteresis (Pin 2, Vin Increasing) VHYS 0.027 0.045 0.063 NCP302/3 − 0.9 (TA = 255C for voltage options from 0.9 to 1.1 V) Supply Current (Pin 2) (Vin = 0.8 V) (Vin = 2.9 V) Iin − − 0.20 0.45 0.6 1.2 V mA Maximum Operating Voltage (Pin 2) Vin(max) − − 10 V Minimum Operating Voltage (Pin 2) (TA = −40°C to 85°C) Vin(min) − − 0.55 0.65 0.70 0.80 V Reset Output Current (Pin 1, Active Low ‘L’ Suffix Devices) IOUT Nch Sink Current, NCP302, NCP303 (VOUT = 0.05V, Vin = 0.70V) (VOUT = 0.50V, Vin = 0.85V) Pch Source Current, NCP302 (VOUT = 2.4V, Vin = 4.5V) Reset Output Current (Pin 1, Active High ‘H’ Suffix Devices) mA 0.01 0.05 0.05 0.50 − − 1.0 6.0 − IOUT mA Nch Sink Current, NCP302, NCP303 (VOUT = 0.5 V, Vin = 1.5 V) 1.05 2.5 − Pch Source Current, NCP302 (VOUT = 0.4 V, Vin = 0.7 V) (VOUT = GND, Vin = 0.8 V) 0.011 0.014 0.04 0.08 − − 0.50 0.67 0.84 2.0 10 120 300 − − CD Delay Pin Threshold Voltage (Pin 5) (Vin = 0.99 V) VTCD V Delay Capacitor Pin Sink Current (Pin 5) (Vin = 0.7 V, VCD = 0.1V) (Vin = 0.85 V, VCD = 0.5V) ICD Delay Pullup Resistance (Pin 5) RD 0.5 1.0 2.0 MW Detector Threshold (Pin 2, Vin Decreasing) (TA = 25°C) (TA = −40°C to 125°C) VDET− 1.764 1.746 1.800 − 1.836 1.854 V Detector Threshold Hysteresis (Pin 2, Vin Increasing) VHYS 0.054 0.090 0.126 V − − 0.23 0.48 0.7 1.3 mA NCP302/3 − 1.8 Supply Current (Pin 2) (Vin = 1.7 V) (Vin = 3.8 V) Iin mA Maximum Operating Voltage (Pin 2) Vin(max) − − 10 V Minimum Operating Voltage (Pin 2) (TA = 25°C) (TA = −40°C to 125°C) Vin(min) − − 0.55 0.65 0.70 0.80 V Reset Output Current (Pin 1, Active Low ‘L’ Suffix Devices) IOUT mA Nch Sink Current, NCP302, NCP303 (VOUT = 0.05V, Vin = 0.70V) (VOUT = 0.50V, Vin = 1.5V) 0.01 1.0 0.05 2.0 − − Pch Source Current, NCP302 (VOUT = 2.4V, Vin = 4.5V) 1.0 6.0 − Reset Output Current (Pin 1, Active High ‘H’ Suffix Devices) IOUT Nch Sink Current, NCP302, NCP303 (VOUT = 0.5 V, Vin = 5.0 V) Pch Source Current, NCP302 (VOUT = 0.4 V, Vin = 0.7 V) (VOUT = GND, Vin = 1.5 V) CD Delay Pin Threshold Voltage (Pin 5) (Vin = 1.98 V) VTCD www.onsemi.com 3 mA 6.3 11 − 0.011 0.525 0.04 0.6 − − 0.99 1.34 1.68 V NCP302, NCP303 ELECTRICAL CHARACTERISTICS (continued) (For all values TA = −40°C to +125°C, unless otherwise noted.) Characteristic Symbol Min Typ Max 2.0 200 120 1600 − − Unit NCP302/3 − 1.8 Delay Capacitor Pin Sink Current (Pin 5) (Vin = 0.7 V, VCD = 0.1V) (Vin = 1.5 V, VCD = 0.5V) ICD Delay Pullup Resistance (Pin 5) RD 0.5 1.0 2.0 MW Detector Threshold (Pin 2, Vin Decreasing) (TA = 25°C) (TA = −40°C to 125°C) VDET− 1.96 1.94 2.00 − 2.04 2.06 V Detector Threshold Hysteresis (Pin 2, Vin Increasing) VHYS 0.06 0.10 0.14 V − − 0.23 0.48 0.8 1.3 mA NCP302/3 − 2.0 Supply Current (Pin 2) (Vin = 1.9 V) (Vin = 4.0 V) Iin mA Maximum Operating Voltage (Pin 2) Vin(max) − − 10 V Minimum Operating Voltage (Pin 2) (TA = 25°C) (TA = −40°C to 125°C) Vin(min) − − 0.55 0.65 0.70 0.80 V Reset Output Current (Pin 1, Active Low ‘L’ Suffix Devices) IOUT mA Nch Sink Current, NCP302, NCP303 (VOUT = 0.05V, Vin = 0.70V) (VOUT = 0.50V, Vin = 1.5V) 0.01 1.0 0.14 3.5 − − Pch Source Current, NCP302 (VOUT = 2.4V, Vin = 4.5V) 1.0 9.7 − Reset Output Current (Pin 1, Active High ‘H’ Suffix Devices) IOUT Nch Sink Current, NCP302, NCP303 (VOUT = 0.5 V, Vin = 5.0 V) Pch Source Current, NCP302 (VOUT = 0.4 V, Vin = 0.7 V) (VOUT = GND, Vin = 1.5 V) mA 6.3 11 − 0.011 0.525 0.04 0.6 − − 1.10 1.49 1.87 2.0 200 250 3600 − − CD Delay Pin Threshold Voltage (Pin 5) (Vin = 2.2 V) VTCD V Delay Capacitor Pin Sink Current (Pin 5) (Vin = 0.7 V, VCD = 0.1V) (Vin = 1.5 V, VCD = 0.5V) ICD Delay Pullup Resistance (Pin 5) RD 0.5 1.0 2.0 MW Detector Threshold (Pin 2, Vin Decreasing) (TA = 25°C) (TA = −40°C to 125°C) VDET− 2.646 2.619 2.700 − 2.754 2.781 V Detector Threshold Hysteresis (Pin 2, Vin Increasing) VHYS 0.081 0.135 0.189 mA NCP302/3− 2.7 Supply Current (Pin 2) (Vin = 2.6 V) (Vin = 4.7 V) Iin − − 0.25 0.50 0.8 1.3 V mA Maximum Operating Voltage (Pin 2) Vin(max) − − 10 V Minimum Operating Voltage (Pin 2) (TA = 25°C) (TA = −40°C to 125°C) Vin(min) − − 0.55 0.65 0.70 0.80 V Reset Output Current (Pin 1, Active Low ‘L’ Suffix Devices) IOUT mA Nch Sink Current, NCP302, NCP303 (VOUT = 0.05V, Vin = 0.70V) (VOUT = 0.50V, Vin = 1.5V) 0.01 1.0 0.14 3.5 − − Pch Source Current, NCP302 (VOUT = 2.4V, Vin = 4.5V) 1.0 9.7 − Reset Output Current (Pin 1, Active High ‘H’ Suffix Devices) IOUT Nch Sink Current, NCP302, NCP303 (VOUT = 0.5 V, Vin = 5.0 V) mA 6.3 www.onsemi.com 4 11 − NCP302, NCP303 ELECTRICAL CHARACTERISTICS (continued) (For all values TA = −40°C to +125°C, unless otherwise noted.) Characteristic Symbol Min Typ Max 0.011 0.525 0.04 0.6 − − 1.49 2.01 2.53 2.0 200 250 3600 − − Unit NCP302/3− 2.7 Pch Source Current, NCP302 (VOUT = 0.4 V, Vin = 0.7 V) (VOUT = GND, Vin = 1.5 V) CD Delay Pin Threshold Voltage (Pin 5) (Vin = 2.97 V) VTCD V Delay Capacitor Pin Sink Current (Pin 5) (Vin = 0.7 V, VCD = 0.1V) (Vin = 1.5 V, VCD = 0.5V) ICD Delay Pullup Resistance (Pin 5) RD 0.5 1.0 2.0 MW Detector Threshold (Pin 2, Vin Decreasing) (TA = 25°C) (TA = −40°C to 125°C) VDET− 2.94 2.91 3.00 − 3.06 3.09 V Detector Threshold Hysteresis (Pin 2, Vin Increasing) VHYS 0.09 0.15 0.21 V − − 0.25 0.50 0.9 1.3 mA NCP302/3 − 3.0 Supply Current (Pin 2) (Vin = 2.87 V) (Vin = 5.0 V) Iin mA Maximum Operating Voltage (Pin 2) Vin(max) − − 10 V Minimum Operating Voltage (Pin 2) (TA = 25°C) (TA = −40°C to 125°C) Vin(min) − − 0.55 0.65 0.70 0.80 V Reset Output Current (Pin 1, Active Low ‘L’ Suffix Devices) IOUT mA Nch Sink Current, NCP302, NCP303 (VOUT = 0.05V, Vin = 0.70V) (VOUT = 0.50V, Vin = 1.5V) 0.01 1.0 0.14 3.5 − − Pch Source Current, NCP302 (VOUT = 2.4V, Vin = 4.5V) 1.0 9.7 − Reset Output Current (Pin 1, Active High ‘H’ Suffix Devices) IOUT Nch Sink Current, NCP302, NCP303 (VOUT = 0.5 V, Vin = 5.0 V) Pch Source Current, NCP302 (VOUT = 0.4 V, Vin = 0.7 V) (VOUT = GND, Vin = 1.5 V) mA 6.3 11 − 0.011 0.525 0.04 0.6 − − 1.65 2.23 2.81 2.0 200 250 3600 − − CD Delay Pin Threshold Voltage (Pin 5) (Vin = 3.3 V) VTCD V Delay Capacitor Pin Sink Current (Pin 5) (Vin = 0.7 V, VCD = 0.1V) (Vin = 1.5 V, VCD = 0.5V) ICD Delay Pullup Resistance (Pin 5) RD 0.5 1.0 2.0 MW Detector Threshold (Pin 2, Vin Decreasing) (TA = 25°C) (TA = −40°C to 125°C) VDET− 4.410 4.365 4.500 − 4.590 4.635 V Detector Threshold Hysteresis (Pin 2, Vin Increasing) VHYS 0.135 0.225 0.315 V − − 0.33 0.52 1.0 1.4 mA NCP302/3 − 4.5 Supply Current (Pin 2) (Vin = 4.34 V) (Vin = 6.5 V) Iin mA Maximum Operating Voltage (Pin 2) Vin(max) − − 10 V Minimum Operating Voltage (Pin 2) (TA = 25°C) (TA = −40°C to 125°C) Vin(min) − − 0.55 0.65 0.70 0.80 V Reset Output Current (Pin 1, Active Low ‘L’ Suffix Devices) IOUT Nch Sink Current, NCP302, NCP303 (VOUT = 0.05V, Vin = 0.70V) (VOUT = 0.50V, Vin = 1.5V) mA 0.01 1.0 www.onsemi.com 5 0.05 2.0 − − NCP302, NCP303 ELECTRICAL CHARACTERISTICS (continued) (For all values TA = −40°C to +125°C, unless otherwise noted.) Characteristic Symbol Min Typ Max 1.5 10.5 − Unit NCP302/3 − 4.5 Pch Source Current, NCP302 (VOUT = 5.9V, Vin = 8.0V) Reset Output Current (Pin 1, Active High ‘H’ Suffix Devices) IOUT Nch Sink Current, NCP302, NCP303 (VOUT = 0.5 V, Vin = 5.0 V) Pch Source Current, NCP302 (VOUT = 0.4 V, Vin = 0.7 V) (VOUT = GND, Vin = 1.5 V) mA 6.3 11 − 0.011 0.525 0.04 0.6 − − 2.25 3.04 3.83 2.0 200 120 1600 − − CD Delay Pin Threshold Voltage (Pin 5) (Vin = 4.95 V) VTCD V Delay Capacitor Pin Sink Current (Pin 5) (Vin = 0.7 V, VCD = 0.1V) (Vin = 1.5 V, VCD = 0.5V) ICD Delay Pullup Resistance (Pin 5) RD 0.5 1.0 2.0 MW Detector Threshold (Pin 2, Vin Decreasing) (TA = 25°C) (TA = −40°C to 125°C) VDET− 4.606 4.559 4.700 − 4.794 4.841 V Detector Threshold Hysteresis (Pin 2, Vin Increasing) VHYS 0.141 0.235 0.329 V − − 0.34 0.53 1.0 1.4 mA NCP302/3 − 4.7 Supply Current (Pin 2) (Vin = 4.54 V) (Vin = 6.7 V) Iin mA Maximum Operating Voltage (Pin 2) Vin(max) − − 10 V Minimum Operating Voltage (Pin 2) (TA = 25°C) (TA = −40°C to 125°C) Vin(min) − − 0.55 0.65 0.70 0.80 V Reset Output Current (Pin 1, Active Low ‘L’ Suffix Devices) IOUT mA Nch Sink Current, NCP302, NCP303 (VOUT = 0.05V, Vin = 0.70V) (VOUT = 0.50V, Vin = 1.5V) 0.01 1.0 0.05 2.0 − − Pch Source Current, NCP302 (VOUT = 5.9V, Vin = 8.0V) 1.5 10.5 − Reset Output Current (Pin 1, Active High ‘H’ Suffix Devices) IOUT Nch Sink Current, NCP302, NCP303 (VOUT = 0.5 V, Vin = 5.0 V) Pch Source Current, NCP302 (VOUT = 0.4 V, Vin = 0.7 V) (VOUT = GND, Vin = 1.5 V) CD Delay Pin Threshold Voltage (Pin 5) (Vin = 5.17 V) VTCD Delay Capacitor Pin Sink Current (Pin 5) (Vin = 0.7 V, VCD = 0.1V) (Vin = 1.5 V, VCD = 0.5V) ICD Delay Pullup Resistance (Pin 5) RD mA 6.3 11 − 0.011 0.525 0.04 0.6 − − 2.59 3.49 4.40 2.0 200 120 1600 − − 0.5 1.0 2.0 V mA MW Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. www.onsemi.com 6 NCP302, NCP303 NCP302L NCP303L VDET+ + 2.0 V VDET+ + 2.0 V 0.7 V 0.7 V GND GND Input Voltage, Pin 2 Reset Output Voltage, Pin 1 VDET+ + 2.0 V 5.0 V VDET+ + 2.0 V 2 2.5 V GND GND tD1 tD2 tD1 tD2 NCP302 and NCP303 series are measured with a 10 pF capacitive load. NCP303 has an additional 470 k pullup resistor connected from the reset output to +5.0 V. The reset output voltage waveforms are shown for the active low ‘L’ devices. Output time delay tD1 and tD2 are dependent upon the delay capacitance. Refer to Figures 30, 31, and 32. The upper detector threshold, VDET+ is the sum of the lower detector threshold, VDET− plus the input hysteresis, VHYS. Figure 2. Measurement Conditions for tD1 and tD2 www.onsemi.com 7 NCP302, NCP303 Table 1. ELECTRICAL CHARACTERISTIC TABLE FOR 0.9 − 4.9 V NCP302 Series Detector Threshold Detector Threshold Hysteresis Vin Low Vin High Vin Low Vin High Pch Source Current VHYS (V) Iin (mA) (Note 5) Iin (mA) (Note 6) IOUT (mA) (Note 7) IOUT (mA) (Note 8) IOUT(mA) (Note 9) VDET− (V) (Note 4) Part Number Supply Current Nch Sink Current Min Typ Max Min Typ Max Typ Typ Typ Typ Typ NCP302LSN09T1 0.882 0.9 0.918 0.027 0.045 0.063 0.20 0.45 0.05 0.5 2.0 NCP302LSN15T1 1.470 1.5 1.530 0.045 0.075 0.105 NCP302LSN18T1 1.764 1.8 1.836 0.054 0.090 0.126 0.23 0.48 NCP302LSN20T1 1.960 2.0 2.040 0.060 0.100 0.140 NCP302LSN27T1 2.646 2.7 2.754 0.081 0.135 0.189 0.25 0.50 NCP302LSN30T1, 2.940 3.0 3.060 0.090 0.150 0.210 NCV302LSN30T1, 2.940 3.0 3.060 0.090 0.150 0.210 NCP302LSN33T1 3.234 3.3 3.366 0.099 0.165 0.231 NCP302LSN38T1 3.724 3.8 3.876 0.114 0.190 0.266 NCP302LSN40T1 3.920 4.0 4.080 0.120 0.200 0.280 NCP302LSN43T1 4.214 4.3 4.386 0.129 0.215 0.301 NCP302LSN45T1 4.410 4.5 4.590 0.135 0.225 0.315 0.33 0.52 NCP302LSN47T1 4.606 4.7 4.794 0.141 0.235 0.329 0.34 0.53 3.0 4. Values shown apply at +25°C only. For voltage options greater than 1.1 V, VDET− limits over operating temperature range (−40°C to +125°C) are VNOM ±3%. For voltage options < 1.2 V, VDET− is guaranteed only at +25°C. 5. Condition 1: 0.9 — 2.9 V, Vin = VDET− − 0.10 V; 3.0 — 3.9 V, Vin = VDET− − 0.13 V; 4.0 — 4.9 V, Vin = VDET− − 0.16 V 6. Condition 2: 0.9 — 4.9 V, Vin = VDET− + 2.0 V 7. Condition 3: 0.9 — 4.9 V, Vin = 0.7 V, VOUT = 0.05 V, Active Low ‘L’ Suffix Devices 8. Condition 4: 0.9 — 1.0 V, Vin = 0.85 V, VOUT = 0.5 V; 1.1 — 1.5 V, Vin = 1.0 V, VOUT = 0.5 V; 1.6 — 4.9 V, Vin = 1.5 V, VOUT = 0.5 V, Condition 4: Active Low ‘L’ Suffix Devices 9. Condition 5: 0.9 — 3.9 V, Vin = 4.5 V, VOUT = 2.4 V; 4.0 — 4.9 V, Vin = 8.0 V, VOUT = 5.9 V, Active Low ‘L’ Suffix Devices Table 2. ELECTRICAL CHARACTERISTIC TABLE FOR 0.9 − 4.9 V NCP302 Series Part Number Supply Current Detector Threshold Detector Threshold Hysteresis Vin Low Vin High Nch Sink Current VDET− (V) (Note 10) VHYS (V) Iin (mA) (Note 11) Iin (mA) (Note 12) Pch Source Current Vin Low Vin High IOUT (mA) (Note 13) IOUT (mA) (Note 14) IOUT (mA) (Note 15) Min Typ Max Min Typ Max Typ Typ Typ Typ Typ NCP302HSN09T1 0.882 0.9 0.918 0.027 0.045 0.063 0.20 0.45 2.5 0.04 0.08 NCP302HSN18T1 1.764 1.8 1.836 0.054 0.090 0.126 0.23 0.48 NCP302HSN27T1 2.646 2.7 2.754 0.081 0.135 0.189 0.25 0.50 NCP302HSN30T1 2.940 3.0 3.060 0.090 0.150 0.210 NCP302HSN40T1 3.920 4.0 4.080 0.120 0.200 0.280 NCP302HSN45T1 4.410 4.5 4.590 0.135 0.225 0.315 0.33 0.52 10. Values shown apply at +25°C only. For voltage options greater than 1.1 V, VDET− limits over operating temperature range (−40°C to +125°C) are VNOM ±3%. For voltage options < 1.2 V, VDET− is guaranteed only at +25°C. 11. Condition 1: 0.9 — 2.9 V, Vin = VDET− − 0.10 V; 3.0 — 3.9 V, Vin = VDET− − 0.13 V; 4.0 — 4.9 V, Vin = VDET− − 0.16 V 12. Condition 2: 0.9 — 4.9 V, Vin = VDET− + 2.0 V 13. Condition 3: 0.9 — 1.4 V, Vin = 1.5 V, VOUT = 0.5 V; 1.5 — 4.9 V, Vin = 5.0 V, VOUT = 0.5 V, Active High ‘H’ Suffix Devices 14. Condition 4: 0.9 — 4.9 V, Vin = 0.7 V, VOUT = 0.4 V, Active High ‘H’ Suffix Devices 15. Condition 5: 0.9 — 1.0 V, Vin = 0.8 V, VOUT = GND; 1.1 — 1.5 V, Vin = 1.0 V, VOUT = GND; 1.6 — 4.9 V, Vin = 1.5 V, VOUT = GND, Active High ‘H’ Suffix Devices www.onsemi.com 8 NCP302, NCP303 Table 3. ELECTRICAL CHARACTERISTIC TABLE FOR 0.9 − 4.9 V NCP303 Series Detector Threshold Nch Sink Current Vin Low Vin High Vin Low Vin High VHYS (V) Iin (mA) (Note 17) Iin (mA) (Note 18) IOUT (mA) (Note 19) IOUT (mA) (Note 20) VDET− (V) (Note 16) Part Number Supply Current Detector Threshold Hysteresis Min Typ Max Min Typ Max Typ Typ Typ Typ NCP303LSN09T1 0.882 0.9 0.918 0.027 0.045 0.063 0.20 0.45 0.05 0.5 NCP303LSN10T1 0.980 1.0 1.020 0.030 0.050 0.070 NCP303LSN11T1 1.078 1.1 1.122 0.033 0.055 0.077 NCP303LSN13T1 1.274 1.3 1.326 0.039 0.065 0.091 NCP303LSN14T1 1.372 1.4 1.428 0.042 0.070 0.098 NCP303LSN15T1 1.470 1.5 1.530 0.045 0.075 0.105 NCP303LSN16T1 1.568 1.6 1.632 0.048 0.080 0.112 NCP303LSN17T1 1.666 1.7 1.734 0.051 0.085 0.119 NCP303LSN18T1 1.764 1.8 1.836 0.054 0.090 0.126 NCP303LSN20T1 1.960 2.0 2.040 0.060 0.100 0.140 NCP303LSN22T1 2.156 2.2 2.244 0.066 0.110 0.154 NCP303LSN23T1 2.254 2.3 2.346 0.069 0.115 0.161 NCP303LSN24T1 2.352 2.4 2.448 0.072 0.120 0.168 NCP303LSN25T1 2.450 2.5 2.550 0.075 0.125 0.175 NCP303LSN26T1 2.548 2.6 2.652 0.078 0.130 0.182 NCP303LSN27T1 2.646 2.7 2.754 0.081 0.135 0.189 NCP303LSN28T1 2.744 2.8 2.856 0.084 0.140 0.196 NCP303LSN29T1 2.842 2.9 2.958 0.087 0.145 0.203 NCP303LSN30T1 2.940 3.0 3.060 0.090 0.150 0.210 NCP303LSN31T1 3.038 3.1 3.162 0.093 0.155 0.217 NCP303LSN32T1 3.136 3.2 3.264 0.096 0.160 0.224 NCP303LSN33T1 3.234 3.3 3.366 0.099 0.165 0.231 NCP303LSN34T1 3.332 3.4 3.468 0.102 0.170 0.238 NCP303LSN36T1 3.528 3.6 3.672 0.108 0.180 0.252 NCP303LSN38T1 3.724 3.8 3.876 0.114 0.190 0.266 NCP303LSN40T1 3.920 4.0 4.080 0.120 0.200 0.280 NCP303LSN42T1 4.116 4.2 4.284 0.126 0.210 0.294 NCP303LSN44T1 4.312 4.4 4.488 0.132 0.220 0.308 NCP303LSN45T1 4.410 4.5 4.590 0.135 0.225 0.315 NCP303LSN46T1 4.508 4.6 4.692 0.138 0.230 0.322 NCP303LSN47T1 4.606 4.7 4.794 0.141 0.235 0.329 NCP303LSN49T1 4.802 4.9 4.998 0.147 0.245 0.343 1.0 2.0 0.23 0.48 0.25 0.50 0.33 0.52 0.34 0.53 16. Values shown apply at +25°C only. For voltage options greater than 1.1 V, VDET− limits over operating temperature range (−40°C to +125°C) are VNOM ±3%. For voltage options < 1.2 V, VDET− is guaranteed only at +25°C. 17. Condition 1: 0.9 — 2.9 V, Vin = VDET− − 0.10 V; 3.0 — 3.9 V, Vin = VDET− − 0.13 V; 4.0 — 4.9 V, Vin = VDET− − 0.16 V 18. Condition 2: 0.9 — 4.9 V, Vin = VDET− + 2.0 V 19. Condition 3: 0.9 — 4.9 V, Vin = 0.7 V, VOUT = 0.05 V, Active Low ‘L’ Suffix Devices 20. Condition 4: 0.9 — 1.0 V, Vin = 0.85 V, VOUT = 0.5 V; 1.1 — 1.5 V, Vin = 1.0 V, VOUT = 0.5 V; 1.6 — 4.9 V, Vin = 1.5 V, VOUT = 0.5 V, Condition 4: Active Low ‘L’ Suffix Devices www.onsemi.com 9 NCP302, NCP303 1.0 10.5 0.9 0.8 Iin, INPUT CURRENT (mA) Iin, INPUT CURRENT (mA) TA = 25°C TA = 25°C 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 2.0 4.0 6.0 10 8.0 2.5 2.0 1.5 1.0 0.5 0 12 0 2.0 Vin, INPUT VOLTAGE (V) Figure 3. NCP302/3 Series 0.9 V Input Current vs. Input Voltage VDET, DETECTOR THRESHOLD VOLTAGE (V) Iin, INPUT CURRENT (mA) TA = 25°C 2.5 2.0 1.5 1.0 0.5 0 2.0 4.0 8.0 6.0 10 12 Vin, INPUT VOLTAGE (V) 0.95 VDET+ 2.75 2.70 VDET− −25 0 25 50 75 100 TA, AMBIENT TEMPERATURE (°C) 125 VDET, DETECTOR THRESHOLD VOLTAGE (V) VDET, DETECTOR THRESHOLD VOLTAGE (V) 2.85 2.60 −50 VDET+ 0.90 VDET− 0.85 0.80 −50 0 −25 25 75 50 100 TA, AMBIENT TEMPERATURE (°C) Figure 6. NCP302/3 Series 0.9 V Detector Threshold Voltage vs. Temperature 2.90 2.65 12 1.00 Figure 5. NCP302/3 Series 4.5 V Input Current vs. Input Voltage 2.80 10 Figure 4. NCP302/3 Series 2.7 V Input Current vs. Input Voltage 17.2 0 6.0 4.0 8.0 Vin, INPUT VOLTAGE (V) 4.9 4.8 VDET+ 4.7 4.6 4.5 VDET− 4.4 4.3 −50 Figure 7. NCP302/3 Series 2.7 V Detector Threshold Voltage vs. Temperature −25 0 25 50 75 100 TA, AMBIENT TEMPERATURE (°C) Figure 8. NCP302/3 Series 4.5 V Detector Threshold Voltage vs. Temperature www.onsemi.com 10 125 NCP302, NCP303 3.5 VOUT, OUTPUT VOLTAGE (V) VOUT, OUTPUT VOLTAGE (V) 1.0 0.8 0.6 TA = −40°C (303L only) 0.4 TA = 25°C (303L only) 0.2 0 3.0 2.5 2.0 1.5 TA = 125°C (303L only) 1.0 TA = −40°C (303L only) 0.5 TA = 25°C (303L only) 0 0 0.4 0.6 Vin, INPUT VOLTAGE (V) 0.2 0.8 1.0 0 Figure 9. NCP302L/3L Series 0.9 V Reset Output Voltage vs. Input Voltage IOUT, OUTPUT SINK CURRENT (mA) VOUT, OUTPUT VOLTAGE (V) 1.6 5.0 4.0 3.0 TA = −40°C (303L only) TA = 25°C (303L only) 1.0 0 0 1.0 2.0 4.0 3.0 Vin, INPUT VOLTAGE (V) 5.0 6.0 TA = −40°C 1.2 1.0 0.8 0.6 TA = 25°C 0.4 TA = 85°C 0.2 0 0 0.4 0.2 0.6 0.8 1.0 Vin, INPUT VOLTAGE (V) Figure 12. NCP302H/3L Series 0.9 V Reset Output Sink Current vs. Input Voltage 12 20 VOUT = 0.5 V 10 IOUT, OUTPUT SINK CURRENT (mA) IOUT, OUTPUT SINK CURRENT (mA) 3.5 VOUT = 0.5 V 1.4 Figure 11. NCP302L/3L Series 4.5 V Reset Output Voltage vs. Input Voltage TA = −40°C 8.0 6.0 TA = 25°C 4.0 TA = 125°C 2.0 0 3.0 Figure 10. NCP302L/3L Series 2.7 V Reset Output Voltage vs. Input Voltage 6.0 2.0 1.5 2.5 1.0 2.0 Vin, INPUT VOLTAGE (V) 0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 VOUT = 0.5 V TA = −40°C 15 10 TA = 25°C TA = 125°C 5.0 0 0 1.0 2.0 3.0 4.0 Vin, INPUT VOLTAGE (V) Vin, INPUT VOLTAGE (V) Figure 13. NCP302H/3L Series 2.7 V Reset Output Sink Current vs. Input Voltage Figure 14. NCP302H/3L Series 4.5 V Reset Output Sink Current vs. Input Voltage www.onsemi.com 11 5.0 20 VOUT = Vin −2.1 V TA = 25°C IOUT, OUTPUT SOURCE CURRENT (mA) IOUT, OUTPUT SOURCE CURRENT (mA) NCP302, NCP303 15 Vin −1.5 V 10 Vin −1.0 V 5.0 Vin −0.5 V 0 0 2.0 4.0 8.0 6.0 10 20 VOUT = Vin −2.1 V TA = 25°C 15 Vin −1.5 V Vin −1.0 V 10 Vin −0.5 V 5.0 0 0 4.0 2.0 TA = 25°C VOUT = Vin −2.1 V 15 Vin −1.5 V 10 Vin −1.0 V 5.0 Vin −0.5 V 0 0 2.0 4.0 8.0 6.0 1.5 TA = 25°C 1.0 Vin = 0.85 V 0.5 Vin = 0.7 V 0 10 0 IOUT, OUTPUT SINK CURRENT (mA) IOUT, OUTPUT SINK CURRENT (mA) 35 Vin = 2.5 V 10 Vin = 2.0 V 5.0 Vin = 1.5 V 0 1.0 0.8 1.0 Figure 18. NCP302H/3L Series 0.9 V Reset Output Sink Current vs. Output Voltage 15 0.5 0.6 VOUT, OUTPUT VOLTAGE (V) Figure 17. NCP302L Series 4.5 V Reset Output Source Current vs. Input Voltage 0 0.4 0.2 Vin, INPUT VOLTAGE (V) TA = 25°C 10 Figure 16. NCP302L Series 2.7 V Reset Output Source Current vs. Input Voltage IOUT, OUTPUT SINK CURRENT (mA) IOUT, OUTPUT SOURCE CURRENT (mA) Figure 15. NCP302L Series 0.9 V Reset Output Source Current vs. Input Voltage 20 8.0 6.0 Vin, INPUT VOLTAGE (V) Vin, INPUT VOLTAGE (V) 1.5 2.0 2.5 TA = 25°C 30 Vin = 4.0 V 25 Vin = 3.5 V 20 Vin = 3.0 V 15 Vin = 2.5 V 10 Vin = 2.0 V 5.0 0 Vin = 1.5 V 0 1.0 2.0 3.0 VOUT, OUTPUT VOLTAGE (V) VOUT, OUTPUT VOLTAGE (V) Figure 19. NCP302H/3L Series 2.7 V Reset Output Sink Current vs. Output Voltage Figure 20. NCP302H/3L Series 4.5 V Reset Output Sink Current vs. Output Voltage www.onsemi.com 12 4.0 1.6 ICD, CD DELAY PIN SINK CURRENT (mA) ICD, CD DELAY PIN SINK CURRENT (mA) NCP302, NCP303 VCD = 0.5 V 1.4 1.2 1.0 0.8 0.6 TA = 25°C 0.4 TA = 85°C 0.2 0 0 0.4 0.2 TA = −40°C 0.6 1.0 0.8 14 VCD = 0.5 V 12 TA = −40°C 10 8.0 TA = 25°C 6.0 4.0 TA = 125°C 2.0 0 0 1.0 0.5 Vin, INPUT VOLTAGE (V) ICD, CD DELAY PIN SINK CURRENT (mA) TA = −40°C 12 TA = 25°C 8.0 TA = 125°C 4.0 16 1.0 2.0 3.0 5.0 4.0 1.0 Vin = 0.85 V 0.5 0 Vin = 0.7 V 0 0.2 0.4 0.6 0.8 Figure 23. NCP302/3 Series 4.5 V CD Delay Pin Sink Current vs. Input Voltage Figure 24. NCP302/3 Series 0.9 V CD Delay Pin Sink Current vs. Voltage TA = 25°C Vin = 2.5 V Vin = 2.0 V 8.0 Vin = 1.5 V 4.0 0 TA = 25°C VCD, DELAY PIN VOLTAGE (V) 12 0 1.5 Vin, INPUT VOLTAGE (V) ICD, CD DELAY PIN SINK CURRENT (mA) ICD, CD DELAY PIN SINK CURRENT (mA) ICD, CD DELAY PIN SINK CURRENT (mA) VCD = 0.5 V 0 0.5 1.0 1.5 3.0 Figure 22. NCP302/3 Series 2.7 V CD Delay Pin Sink Current vs. Input Voltage 20 0 2.5 2.0 Vin, INPUT VOLTAGE (V) Figure 21. NCP302/3 Series 0.9 V CD Delay Pin Sink Current vs. Input Voltage 16 1.5 2.5 2.0 40 TA = 25°C Vin = 4.0 V 30 Vin = 3.5 V 20 Vin = 3.0 V Vin = 2.5 V 10 0 0 1.0 2.0 3.0 VCD, DELAY PIN VOLTAGE (V) VCD, DELAY PIN VOLTAGE (V) Figure 26. NCP302/3 Series 4.5 V CD Delay Pin Sink Current vs. Voltage Figure 25. NCP302/3 Series 2.7 V CD Delay Pin Sink Current vs. Voltage www.onsemi.com 13 1.0 4.0 0.9 Vin = 0.99 V 0.8 0.7 0.6 0.5 0.4 0.3 −50 −25 0 75 25 50 TA, AMBIENT TEMPERATURE (°C) 2.2 VTCD, CD PIN THRESHOLD VOLTAGE (V) VTCD, CD PIN THRESHOLD VOLTAGE (V) NCP302, NCP303 100 Vin = 2.97 V 2.1 2.0 1.9 1.8 1.7 −50 125 10000 3.7 TA = 25°C Vin = 4.95 V 3.6 1000 3.5 3.4 3.3 3.2 −50 0 −25 25 50 75 100 tD1 (ms) 100 tD2 (ms) 10 1.0 0.1 0.00001 125 0.0001 0.001 0.01 0.1 1.0 CD, DELAY PIN CAPACITANCE ( mF) TA, AMBIENT TEMPERATURE (°C) Figure 29. NCP302/3 Series 4.5 V CD Delay Pin Threshold Voltage vs. Temperature Figure 30. NCP302/3 Series 0.9 V Output Time Delay vs. Capacitance 10000 10000 TA = 25°C 1000 t D1, t D2 , OUTPUT TIME DELAY TA = 25°C t D1, t D2 , OUTPUT TIME DELAY 0 75 100 25 50 TA, AMBIENT TEMPERATURE (°C) Figure 28. NCP302/3 Series 2.7 V CD Delay Pin Threshold Voltage vs. Temperature t D1, t D2 , OUTPUT TIME DELAY VTCD, CD PIN THRESHOLD VOLTAGE (V) Figure 27. NCP302/3 Series 0.9 V CD Delay Pin Threshold Voltage vs. Temperature −25 1000 tD1 (ms) 100 10 tD2 (ms) 1.0 0.1 0.00001 0.0001 0.001 0.01 0.1 1.0 tD1 (ms) 100 10 tD2 (ms) 1.0 0.1 0.00001 0.0001 0.001 0.01 0.1 CD, DELAY PIN CAPACITANCE ( mF) CD, DELAY PIN CAPACITANCE ( mF) Figure 31. NCP302/3 Series 2.7 V Output Time Delay vs. Capacitance Figure 32. NCP302/3 Series 4.5 V Output Time Delay vs. Capacitance www.onsemi.com 14 1.0 NCP302, NCP303 160 250 tD2, OUTPUT TIME DELAY (ms) tD2, OUTPUT TIME DELAY (ms) CD = 0.1 mF 200 160 120 80 40 0 −50 −25 0 25 75 50 CD = 0.1 mF 140 120 100 80 60 40 20 0 −50 100 −25 Figure 33. NCP302/3 Series 0.9 V Reset Output Time Delay vs. Temperature 50 75 100 125 1.6 RD, DELAY RESISTANCE (MW) tD2, OUTPUT TIME DELAY (ms) 25 Figure 34. NCP302/3 Series 2.7 V Reset Output Time Delay vs. Temperature 250 CD = 0.1 mF 200 150 100 50 0 −50 0 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) −25 0 25 50 75 1.2 0.8 0.4 0 −50 100 TA, AMBIENT TEMPERATURE (°C) −25 0 25 50 75 100 TA, AMBIENT TEMPERATURE (°C) Figure 35. NCP302/3 Series 4.5 V Reset Output Time Delay vs. Temperature Figure 36. NCP302/3 Series Delay Resistance vs. Temperature www.onsemi.com 15 125 NCP302, NCP303 OPERATING DESCRIPTION Vin will again return to its nominal level and become greater than the VDET+. The voltage detector will turn off the N−Channel MOSFET and allow pullup resistor RD to charge external capacitor CD, thus creating a programmable delay for releasing the reset signal. When the voltage at Pin 5 exceeds the inverter/buffer threshold, typically 0.675 Vin, the reset output will revert back to its original state. The reset output time delay versus capacitance is shown in Figures 30 through 32. The voltage detector and inverter/buffer have built−in hysteresis to prevent erratic reset operation. Although these device series are specifically designed for use as reset controllers in portable microprocessor based systems, they offer a cost−effective solution in numerous applications where precise voltage monitoring and time delay are required. Figures 38 through 46 show various application examples. The NCP302 and NCP303 series devices consist of a precision voltage detector that drives a time delay generator. Figures 37 and 38 show a timing diagram and a typical application. Initially consider that input voltage Vin is at a nominal level and it is greater than the voltage detector upper threshold (VDET+). The voltage at Pin 5 and capacitor CD will be at the same level as Vin, and the reset output (Pin 1) will be in the high state for active low devices, or in the low state for active high devices. If there is a power interruption and Vin becomes significantly deficient, it will fall below the lower detector threshold (VDET−) and the external time delay capacitor CD will be immediately discharged by an internal N−Channel MOSFET that connects to Pin 5. This sequence of events causes the Reset output to be in the low state for active low devices, or in the high state for active high devices. After completion of the power interruption, Input Voltage, Pin 2 Vin VDET+ VDET− Vin Capacitor, Pin 5 Reset Output (Active Low), Pin 1 0.675 Vin Vin VDET− 0V Reset Output (Active High), Pin 1 Vin VDET− 0V tD2 Figure 37. Timing Waveforms www.onsemi.com 16 NCP302, NCP303 APPLICATION CIRCUIT INFORMATION VDD 2 5 CD CD VDD Input * 1 NCP302 Series * Required for GND 3 Microprocessor Reset Reset Output GND NCP303 Figure 38. Microprocessor Reset Circuit 2.85 V 2.70 V Vin < 2.7 ON 2 5 CD Input 1 NCP302 LSN27T1 To Additional Circuitry Reset Output Vin > 2.835 ON 3 GND Figure 39. Battery Charge Indicator Vsupply 5.0 V 1.0 V 0V 2 5 CD CD NCP303 LSN45T1 3 470 k Input 1 Reset Output To Additional Circuitry 0.001 mF Missing Pulse GND Input 0V Vin [0.675*Vin CD Reset Output tD2 Figure 40. Missing Pulse Detector or Frequency Detector www.onsemi.com 17 NCP302, NCP303 VDD RH 2 VDD Input RL 5 CD 1 NCP301 NCP303 LSN27T1 Reset Reset Output Microprocessor GND 3 GND Figure 41. Microprocessor Reset Circuit with Additional Hysteresis Comparator hysteresis can be increased with the addition of resistor RH. The hysteresis equations have been simplified and do not account for the change of input current Iin as Vin crosses the comparator threshold. The internal resistance, Rin is simply calculated using Iin = 0.26 mA at 2.6 V. Vin Decreasing: V th + ǒRR Vin Increasing: V th + ǒ H in Ǔ ) 1 ǒV DET*Ǔ Ǔ RH ) 1 ǒV DET* ) V HYSǓ R in ø R L VHYS = Vin Increasing − Vin Decreasing Test Data ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁ ÁÁÁ ÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁ ÁÁÁ ÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁ ÁÁÁ ÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁ ÁÁÁ ÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Vth Decreasing (V) Vth Increasing (V) VHYS (V) RH (W) RL (kW) 2.70 2.70 2.70 2.70 2.70 2.70 2.70 2.70 2.70 2.70 2.84 2.87 2.88 2.91 2.90 2.94 2.98 2.70 3.04 3.15 0.135 0.17 0.19 0.21 0.20 0.24 0.28 0.27 0.34 0.35 0 100 100 100 220 220 220 470 470 470 − 10 6.8 4.3 10 6.8 4.3 10 6.8 4.3 5.0 V 100 k Test Data C 2 5 CD Input NCP301 NCP302 HSN27T1 LSN27T1 3 C (mF) fOSC (kHz) IQ (mA) 0.01 2590 21.77 1 0.1 490 21.97 Reset Output 1.0 52 22.07 82 k GND Figure 42. Simple Clock Oscillator www.onsemi.com 18 NCP302, NCP303 Vsupply Load Rsense 2 5 CD 3 VDD Input NCP301 NCP303 LSN09T1 LSN27T1 This circuit monitors the current at the load. As current flows through the load, a voltage drop with respect to ground appears across Rsense where Vsense = Iload * Rsense. The following conditions apply: If: ILoad t VDET − /Rsense ILoad w (VDET −+VHYS)/Rsense 50 k 1 Then: Reset Output = 0 V Reset Output = VDD Microcontroller Reset Output GND GND Figure 43. Microcontroller Systems Load Sensing Vsupply 2 5 CD 5 CD Input NCP303 NCP301 LSN27T1 LSN45T1 3 GND 2 Input NCP303 NCP301 LSN27T1 3 GND 2 Input 1 Reset Output 1 Reset Output Vin = 1.0 V to 10 V 5 CD NCP303 NCP301 LSN27T1 LSN18T1 3 1 Reset Output GND A simple voltage monitor can be constructed by connecting several voltage detectors as shown above. Each LED will sequentially turn on when the respective voltage detector threshold (VDET− +VHYS) is exceeded. Note that detector thresholds (VDET−) that range from 0.9 V to 4.9 V in 100 mV steps can be manufactured. Figure 44. LED Bar Graph Voltage Monitor www.onsemi.com 19 NCP302, NCP303 VDD 2 Input EN 5 IN CD Logic 1 NCP302L Series CD 3 1 To MCU or Logic Circuitry Reset Output GND VDD NCP302 Input Pin VDET 0V Logic 1 Enable Pin CD Pin 1 0 VDD VTCD 0V Reset Output 0V Note: Logic 1 is in tristate when EN = 0, VTCD  0.675 * VDD tD2 tD2 Figure 45. Undervoltage Detection with Independent Reset Signal Control logic gate is tristated the undervoltage detector will behave normally. If the tristate is de−asserted, the logic gate will pull the CD pin low resulting in the Reset Output pin changing to an active state. This independent control is useful in power supply sequencing applications when the Reset Output is tied to the enable input of an LDO or DC−DC converter. This circuit monitors VDD for undervoltage. If the VDD input falls below the detector threshold (VDET−), then the capacitor on the CD pin will be immediately discharged resulting in the reset output changing to its active state indicating that an undervoltage event has been detected. The addition of a logic gate (Logic 1) provides for reset output control which is independent of VDD. If the output of the www.onsemi.com 20 NCP302, NCP303 Power Supply 1 (System Core) R1 is Optional CD Pin Pullup 2 R1 5 CD CD Input NCP302L Series 3.3 V Power Supply 2 (I/O Subsystem) 3 GND 2 Input NCP301 LSN30T1 5.0 V Power Supply 3 (Peripheral Subsystem) 3 GND 2 Input NCP301 LSN45T1 3 VP 1 * RP To MCU or Logic Circuitry Reset Output *Required for NCP303 1 Reset Output 1 Reset Output GND VIN Power Supply 1 0V Power Supply 2 0V Power Supply 3 0V CD Pin VIN VTCD 0V NCP302L RESET Output 0V Note: VTCD  0.675 * VIN tD2 tD2 tD2 tD2 Figure 46. Multi−Rail Supply Undervoltage Monitor with Power Good This circuit monitors multiple power supply rails for undervoltage conditions. If any of the three power supplies are in an undervoltage condition, the NCP302 reset output will be immediately set to an active low level. All three power supplies must be above their minimum voltage levels for the NCP302 reset output to generate a “Power Good” level (Reset Output = Power Supply 1 or VP). Optionally, R1 may be added to provide a smaller effective CD pin pullup resistance, (RD’), where RD’ = R1 || RD, with RD (internal CD pin pullup resistance) approximately equal to 1.0 MW, and R1 > 5 kW. If R1