ME2808 Voltage Detectors , ME2808 Series General Description Features ME2808 Series are a set of three-terminal low Highly accuracy： ±1% power voltage detectors implemented in NMOS Low power consumption：TYP 1.8uA (Vin=3V) technology. Each voltage detector in the series Detect detects a particular fixed voltage ranging from 2.0V range ： 2.0V~7.0V in precision and low power consumption standard voltage source, a comparator, hysteresis circuit, and Operating voltage range：1.5V~18V Detect voltage temperature characteristics： an output driver. NMOS technology ensures low TYP±0.9mV/℃ power consumption. Selection Guide Output configuration： NMOS Package： SOT-23-3，SOT-23-5，SOT-89-3，TO-92 Typical Application battery checkers Level selectors Power failure detectors Microcomputer reset Battery backup of Memories Store non-volatile RAM signal protectors Typical Application Circuit V02 0.1V increments to 7.0V. The voltage detectors consist of a high Selection Guide voltage www.microne.com.cn Page 1 of 8 ME2808 Pin Configuration Pin Assignment Pin Number Pin Name Functions SOT-23-3 SOT-23-5 SOT-89-3 TO-92 2 3 3 3 GND Ground 1 1 1 1 VOUT Output Voltage 3 2 2 2 VIN Input Voltage 4 NC No Connection 5 NC No Connection Block Diagram V02 www.microne.com.cn Page 2 of 8 ME2808 Absolute Maximum Ratings PARAMETER SYMBAL RATINGS UNITS VIN Input Voltage VIN 18 V Output Current IOUT 50 mA VOUT GND-0.3~ VIN +0.3 V Output Voltage NMOS SOT23-3/5 Continuous Total Power Dissipation 300 SOT89-3 PD 500 TO-92 mW 500 Operating Ambient Temperature TOpr 0~+70 ℃ Storage Temperature Tstg -50~+125 ℃ Soldering temperature and time Tsolder 260℃, 10s Electrical Characteristics (VDET =2.0V to 7.0V ,TA=25℃ ,unless otherwise noted) Parameter Symbol Conditions Min. Typ. Max. Units VDET Detect Voltage VDET×0.99 VDET VDET×1.01 V VHYS Hysteresis Width VDET×0.02 VDET×0.05 VDET×0.1 V Operating Current IIN Operating Voltage VIN Output Sink Current IOL ∆VDET/∆TA Temperature characteristics VDET=2.0V~ 2.8V VIN =3.0V - 1.8 3 VDET =2.8V~ 3.6V VIN =4.0V - 1.8 4 VDET =3.6V ~ 4.7V VIN =5.0V - 2.1 4 VDET =4.7V~ 7.0V VIN =8.0V - 2.5 4 VDET =2.0V to 7.0V 0.7 VDET=2.0V~ 2.8V VIN =-VDET(S) -0.2 V , VOUT=0.2V 0.5 VDET =2.8V~ 3.6V VIN =-VDET(S) -0.5 V , VOUT=0.3V 0.5 VDET =3.6V ~ 4.7V VIN =-VDET(S) -0.5 V , VOUT=0.3V 1.2 VDET =4.7V~ 7.0V VIN =-VDET(S) -0.5 V , VOUT=0.3V 2.5 0℃≤Topr≤70℃ - 18 ±0.9 mV/℃ 2、VDF ：Actual Detection Voltage value 3、Release Voltage：VDR=VDF+VHYS (ME2808A series) VDR=VDF-VHYS (ME2808B series) www.microne.com.cn V mA Note: 1、VDF(S) ：Specified Detection Voltage value V02 μA Page 3 of 8 ME2808 Functional Description The ME2808 series is a set of voltage detectors equipped with a high stability voltage reference which is connected to the negative input of a comparator — denoted as VREF in the following figure (Fig. 1).When the voltage drop to the positive input of the comparator (i,e,VB) is higher than VREF, VOUT goes high, M1 turns off, and VB is ex-pressed as VBH=VIN×(RB+RC)/(RA+RB+RC).If VIN is decreased so that VB falls to a value that is less than VREF, the comparator output inverts (from high to low), VOUT goes low, VC is high, M1 turns on, RC is bypassed, and VB becomes: VBL=VIN×RB/(RA+RB), which is less than VBH. By so doing the comparator out-put will stay low to prevent the circuit from oscillating when VB ≈ VREF. If VIN falls bellow the minimum operating voltage, the output becomes undefined. When VIN goes from low to VIN×RB/(RA+RB) >VREF, the comparator output goes high and VOUT goes high again. The detection voltage is as defined: VDET(–)=( RA+RB+RC)×VREF/( RB+RC) The release voltage is as defined: VDET(+)=(RA+RB)×VREF / RB The hysteresis width is: VHYS=VDET(+)–VDET(–) Fig.1 demonstrates the NMOS output type with positive output polarity (VOUT is normally high, active low). Fig.1 NMOS output voltage detector (ME2808) V02 www.microne.com.cn Page 4 of 8 ME2808 Timing Chart ME2808AXX: ME2808BXX: V02 www.microne.com.cn Page 5 of 8 ME2808 Package Information ● SOT89-3 ● SOT23-3 V02 www.microne.com.cn Page 6 of 8 ME2808 ● SOT23-5 ● TO-92 V02 www.microne.com.cn Page 7 of 8 ME2808 V02 The information described herein is subject to change without notice. Nanjing Micro One Electronics Inc is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. The application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Nanjing Micro One Electronics Inc is strictly prohibited. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Nanjing Micro One Electronics Inc. Although Nanjing Micro One Electronics Inc exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. The user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue. www.microne.com.cn Page 8 of 8