AX6901ERA

AX6901/2/3/4 3-Pin Microprocessor Reset Circuits  GENERAL DESCRIPTION TheAX6901/2/3/4 is used for microprocessor (µP) supervisory circuits to monitor the power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V, +3.3V, +3.0V, +2.5V powered circuits. These circuits perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 200ms after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. TheAX6901/2/3/4 has push pull outputs. TheAX6901/3 has an active low RESET output, while theAX6902/4 has an active high RESET output. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 1.0V. Low supply current makes theAX6901/2/3/4 ideal for use in portable equipment. TheAX6901/2/3/4 is available in a 3-pin SOT23 package.  FEATURES - Precision Monitoring of +2.5,+3V, +3.3V, and +5V Power-Supply Voltages - Fully Specified Over Temperature - Available in Three Output Configurations - Push-Pull RESET Low Output(AX6901/3) Push-Pull RESET High Output(AX6902/4 200ms (Typ.)min Power-On Reset Pulse Width 25µA Supply Current Guaranteed Reset Valid to VCC = +1.0V Power Supply Transient Immunity No External Components Available in the 3-Pin Pb-Free SOT-23 Package  BLOCK DIAGRAM VCC P-MOS + VREF Delay Circuit RESET / RESET N-MOS GND 1/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.2.0 Dec. 25, 2015 AX6901/2/3/4  PIN ASSIGNMENT The package of AX6901/2/3/4 is SOT-23-3L; the pin assignment is given by: (Top View) GND 1 AX6901 AX6902 RESET (RESET) 3 VCC 2 Name GND SOT-23-3L RESET (RESET) (Top View) RESET (RESET) VCC 1 AX6903 AX6904 GND Description Ground Reset output pin L: forAX6901/3 H: forAX6902/4 Operating voltage input 3 VCC 2 SOT-23-3L  ORDER/MARKING INFORMATION Order Information Top Marking (SOT-23-3L) AX690 X X X X Enable Voltage 1: Active-Low 2: Active-High 3: Active-Low 4: Active-High A: 4.63 B: 4.38 C: 4.00 D: 3.08 E: 2.93 F: 2.63 G: 2.25 H: 2.70 I : 4.25 J: 2.80 Package Packing R:SOT23-3L Blank : Bag A : Taping L LY WX ID Code: internal WW : 01~26(A~Z) 27~52(a~z) Year : A = 2010 1 = 2011 Identification code 2/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.2.0 Dec. 25, 2015 AX6901/2/3/4 Appendix Part Number Package AX6901A AX6901B AX6901C AX6901D AX6901E AX6901F AX6901G AX6901H AX6901I AX6901J AX6902A AX6902B AX6902C AX6902D AX6902E AX6902F AX6902G AX6902H AX6902I AX6902J SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L Identification Code CA CB CC CD CE CF CG Ca Cb Ci CH CI CJ CK CL CM CN Cd Ce Ck Part Number Package AX6903A AX6903B AX6903C AX6903D AX6903E AX6903F AX6903G AX6903H AX6903I AX6903J AX6904A AX6904B AX6904C AX6904D AX6904E AX6904F AX6904G AX6904H AX6904I AX6904J SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L SOT-23-3L Identification Code CO CP CQ CR CS CT CU Cf Cg Cj C1 C2 C3 C4 C5 C6 C7 Ch Cm Cn  ABSOLUTE MAXIMUM RATUNGS (at TA=25°C) Characteristics Symbol Rating Unit VCC Pin Voltage VCC GND - 0.3 to GND + 6.5 V RESET, RESET (push-pull) Pin Voltage VRESET GND - 0.3 to VCC + 0.3 V Input Current, VCC ICC 20 mA Output Current, RESET, RESET IO 5 mA Power Dissipation PD ( TJ-TA ) / θJA mW Storage Temperature Range TST -60 to +150 °C Operating Temperature Range TOP -40 to +85 °C Junction Temperature TJ -40 to +150 °C Thermal Resistance from Junction to case θJC 110 °C/W Thermal Resistance from Junction to ambient θJA 250 °C/W Note: θJA is measured with the PCB copper area of approximately 1 in2(Multi-layer). That need connect to VSS pin. 3/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.2.0 Dec. 25, 2015 AX6901/2/3/4  ELECTRICAL CHARACTERISTICS TA=25 °C (unless otherwise noted) Characteristics Symbol Conditions Min Typ Operating VCC Range VRange 1.0 Supply Current ICC VCC = VTH+1.0V 25 AX6901/2/3/4A 4.54 4.63 AX6901/2/3/4B 4.29 4.38 AX6901/2/3/4I 4.16 4.25 AX6901/2/3/4C 3.92 4.00 Reset Threshold VTH AX6901/2/3/4D 3.02 3.08 TA=25°C AX6901/2/3/4E 2.87 2.93 AX6901/2/3/4H 2.64 2.70 AX6901/2/3/4F 2.57 2.63 AX6901/2/3/4G 2.20 2.25 Reset Threshold VTHT TA = 0°C to +85°C 50 Tempco Set-up Time TS VCC = 0 to (VTH – 100mV) 1 VCC to Reset Delay TRD VCC=VTH to (VTH-100mV) 20 Reset Active Timeout TDELAY TA = 0°C to +85°C 160 200 Period 1.8V VTH (max), ISOURCE = 500uA, 0.8VCC VOL VCC > VTH (max), ISINK = 1.2mA, RESET 1.8V < VCC < VTH (min), Output Voltage ISOURCE = 500uA 0.8 VOH (AX6902/4) VCC 1.2V < VCC < 1.8V, ISOURCE = 150uA Hysteresis at VCC VHys Input voltage 40 Max Units 6 V 35 μA 4.71 4.46 4.33 4.08 3.15 V 3.00 2.75 2.69 2.30 - ppm/°C - μs μs 260 ms 0.3 V 0.3 V V - V - mV  APPLICATION CIRCUIT VCC VCC VCC AX690X Microprocessor RESET (RESET) GND RESET INPUT GND 4/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.2.0 Dec. 25, 2015 AX6901/2/3/4  FUNCTION DESCRIPTIONS A microprocessor’s (µP’s) reset input starts the µP in a known state. The AX6901/2/3/4 asserts reset to prevent code-execution errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 200ms after VCC has risen above the reset threshold. The AX6901/2/3/4 has a push-pull output stage.  APPLICATION INFORMATION Negative-Going VCC Transients In addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, the AX6901/2/3/4 is relatively immune to short-duration negative-going VCC transients (glitches). The AX6901/2/3/4 does not generate a reset pulse. The graph was generated using a negative going pulse applied to VCC, starting 0.5V above the actual reset threshold and ending below it by the magnitude indicated (reset comparator overdrive). The graph indicates the maximum pulse width a negative going VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. Typically, a VCC transient that goes 50mV below the reset threshold A 0.1µF bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. Ensuring a Valid Reset Output Down to VCC = 0 RESET is guaranteed to be a logic low for VCC > 1.0V. Once VCC exceeds the reset threshold, an internal timer keeps RESET low for the reset timeout period; after this interval, RESET goes high. If a brownout condition occurs (VCC dips below the reset threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and RESET goes low. The internal timer starts after VCC returns above the reset threshold, and RESET remains low for the reset timeout period. When VCC falls below 1.0V, theAX6901/3 RESET output no longer sinks current—it becomes an open circuit. Therefore, high-impedance CMOS logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applications since most µP and other circuitry is inoperative with VCC below 1.0V. However, in applications where RESET must be valid down to 0V, adding a pull down resistor to RESET causes any stray leakage currents to flow to ground, holding RESET low. R1’s value is not critical; 100k is large enough not to load RESET and small enough to pull RESET to ground. For theAX6902/4 if RESET is required to remain valid for VCC < 1.0V. 5/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.2.0 Dec. 25, 2015 AX6901/2/3/4 Benefits of Highly Accurate Reset Threshold Most µP supervisor ICs has reset threshold voltages between 5% and 10% below the value of nominal sup-ply voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. When using ICs rated at only the nominal supply ±5%, this leaves a zone of uncertainty where the supply is between 5% and 10% low, and where the reset may or may not be asserted. 6/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.2.0 Dec. 25, 2015 AX6901/2/3/4  TYPICAL CHARACTERISTICS Temperature Vs Threshold Voltage Temperature Vs Reset Active Timeout Period Reset Active Timeout Period (ms) Threshold Voltage (V) 2.96 2.95 2.94 2.93 2.92 2.91 VTH=2.93V 2.9 -50 -25 0 25 50 75 250 240 230 220 210 200 190 180 170 160 150 -50 100 -25 0 Temperature (℃) 34 34 32 32 Supply Current (uA) Reset AcSupply Current (uA) 50 75 100 Threshold Voltage Vs Supply Current Temperature Vs Supply Current 30 28 26 24 22 30 28 26 24 22 VTH=2.93V VCC=VTH+1V 20 20 -50 -25 0 25 50 75 2.25 100 2.63 2.93 3.08 4 4.38 4.63 Threshold Voltage (V) Temperature (℃) Temperature Vs Power-Down Reset Delay Temperature Vs Power-Down Reset Delay 50 50 45 VTH=2.25V 40 VOD=VTH-VCC Power-Down Reset Delay (uS) Power-Down Reset Delay (uS) 25 Temperature (℃) 35 30 25 VOD=50mV VOD=100mV 20 15 10 VOD=200mV 5 0 VTH=2.93V 45 VOD=VTH-VCC 40 35 VOD=50mV 30 25 20 15 VOD=200mV VOD=100mV 10 5 0 -50 -25 0 25 50 75 100 Temperature (℃) -50 -25 0 25 50 75 100 Temperature (℃) Temperature Vs Power-Down Reset Delay Power-Down Reset Delay (uS) 100 90 VTH=4.63V 80 VOD=VTH-VCC 70 VOD=100mV 60 VOD=50mV 50 40 30 20 10 VOD=200mV 0 -50 -25 0 25 50 75 100 Temperature (℃) 7/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.2.0 Dec. 25, 2015 AX6901/2/3/4  TIMING DIAGRAM Giltch Immunity Maximum Transient Duration(us) 3500 3000 2500 3000 2000 1500 1000 500 900 270 0 0 100 200 140 300 90 400 70 500 58 600 50 700 50 800 48 48 900 1000 1100 RESET COMPARATOR OVERDRIVE(mV) 8/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.2.0 Dec. 25, 2015 AX6901/2/3/4  PACKAGE OUTLINES SOT-23-3L D E E1 C GAUGE PLANE θ L L1 e1 VIEW C A1 A A2 e SEE VIEW C b Symbol A A1 A2 b C D E E1 L L1 e e1 θ Dimensions in Millimeters Min. Nom. Max. 1.05 1.45 0.05 0.15 0.90 1.10 1.30 0.30 0.50 0.08 0.20 2.70 2.90 3.10 2.60 2.80 3.00 1.40 1.60 1.80 0.30 0.60 0.50 0.60 0.70 1.80 1.90 2.00 0.85 1.00 1.15 0o 5o 10o Dimensions in Inches Min. Nom. Max. 0.041 0.057 0.002 0.006 0.035 0.043 0.051 0.012 0.020 0.003 0.008 0.106 0.114 0.122 0.102 0.110 0.118 0.055 0.063 0.071 0.012 0.024 0.020 0.024 0.028 0.071 0.075 0.079 0.033 0.039 0.045 0o 5o 10o 9/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.2.0 Dec. 25, 2015