ACE809 Technology 3-Pin Microprocessor Reset Circuits Description The ACE809 microprocessor supervisory circuits can be used to monitor the power supplies in microprocessor and digital systems. They provide s reset to the microprocessor during power-up, power-down and brown-out conditions. The function of the ACE809 is to monitor the VCC supply voltage, and assert a reset signal whenever this voltage declines below the factory-programmed reset threshold. The reset signal remains asserted for 240ms after VCC rises above the threshold. The ACE809 has an active-low RESET output. The output of the ACE809 is guaranteed valid down to VCC =1V. The device is available in a SOT-23-3L package. The ACE809 is optimized to reject fast transient glitches on the VCC line. Low supply current of 25µA, (VCC=3.3V) makes these devices suitable for battery powered applications. Features • • • • • • Precision Vcc Monitor for 3.0V,3.3V and 5.0V Supplies 140ms Guaranteed Minimum RESET Output Duration RESET Output Guaranteed to Vcc=1.0V Low 25μA Supply Current. Vcc Transient Immunity. No External Components. Application • • • • Embedded systems Computers Critical μP Power Supply Monitoring Battery Powered equipment Absolute Maximum Ratings Parameter Symbol Max Unit Supply Voltage VCC 5.5 V Output Voltage RESET -0.3 to (Vcc+0.3) V Input Current 20 mA Output Current IOUT 20 mA Power Dissipation PD Internally Limited Thermal resistance junction to ambient ℃/W 230 SOT-23-3 θJA Operating junction temperature range TJ 0 to 125 ℃ Storage temperature range TSTG -60 to 150 ℃ Note 1: Exceeding these rating could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. Note 2: Voltage values are with respect to the anode terminal unless otherwise noted. VER 1.2 1 ACE809 Technology 3-Pin Microprocessor Reset Circuits Packaging Type SOT-23-3 3 1 2 Pin No 1 Symbol GND 2 RESET 3 Vcc Description Ground RESET output remains low while Vcc is below the reset voltage threshold and for 240msec(typ.) after Vcc rises above reset threshold Supply Voltage (typ.) Ordering information Selection Guide ACE809 X XX + H Halogen - free Pb - free BM: SOT-23-3 Vout Volts : L : 4.63V M : 4.38V J : 4.00V T : 3.08V S : 2.93V R : 2.63V Power Dissipation Table Package BM TA≤ 25 OC TA=70 OC TA= 85 OC θJA Df(mW/℃) ( C /W ) TA≧25℃ Power rating(mW) Power rating(mW) Power rating (mW) 230 3.5 543 348 283 O Note:1.Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into Thermal shutdown. 2.TJ: Junction Temperature Calculation TJ = TA + ( PD x θJA ) The θJA numbers are guidelines for the thermal performance of the device/PC-board system. All of the above assume no Ambient airflow. 3.θJA : Thermal Resistance-Junction to Ambient, DF: Derating factor, Po: Power consumption VER 1.2 2 ACE809 Technology 3-Pin Microprocessor Reset Circuits Recommended Work Conditions Item Input Voltage (Vin) Junction Temperature (TJ) Min 2.0 Typ. Max 5.5 0~125 Unit V ℃ Electrical Characteristics Parameter Symbol Input Voltage Supply Current Vcc Icc Reset Threshold Reset Threshold Temperature Coefficient (Note) Vcc to Reset Delay Vcc=VTH to (VTH-100mV) Reset Active Timeout Period RESET Output Voltage Low RESET Output Voltage High Typical VTH VOL VOH Test Conditions Min. Typ. Max. 2.0 ACE809-4.63 ACE809-4.38 ACE809-4.00 ACE809-3.08 ACE809-2.93 ACE809-2.63 ISINK=3mA ISOURCE=800uA 4.54 4.29 3.92 3.02 2.87 2.58 18 4.63 4.38 4.00 3.08 2.93 2.63 5.5 25 4.72 4.47 4.08 3.14 2.99 2.68 V uA V 30 ppm/ ℃ 20 usec 240 msec V V 0.4 0.8Vcc Unit Applications Vcc C=0.1uF Vcc ACE809 RESET GND Vcc Processor RESET Input GND VER 1.2 3 ACE809 Technology 3-Pin Microprocessor Reset Circuits Typical Performance Characteristics Supply Current VS. Temperature Temperature (℃) Power-Down Reset Delay VS. Temperature Temperature (℃) Normalized Threshold VS. Temperature Temperature (℃) Power-Up Reset Timeout VS. Temperature Temperature (℃) VER 1.2 4 ACE809 Technology 3-Pin Microprocessor Reset Circuits Packing Information SOT-23-3 VER 1.2 5 ACE809 Technology 3-Pin Microprocessor Reset Circuits Notes ACE does not assume any responsibility for use as critical components in life support devices or systems without the express written approval of the president and general counsel of ACE Electronics Co., LTD. As sued herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and shoes failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. ACE Technology Co., LTD. http://www.ace-ele.com/ VER 1.2 6