ACE803N/ACE809N/ACE810N Ultra Low Power Microprocessor Reset IC Description The ACE803N/ACE809N/ACE810N series are micro- processor (μP) supervisory circuits used to monitor the power supplies in μP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components. 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 140ms after VCC has risen above the reset threshold. The ACE809N/810N have CMOS outputs, The ACE803N has open drain output. The ACE803N/809N have an active-low RESET output, while the ACE810N 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 1.15V over the temperature range. Features Precise Reset Threshold: ±2.5% CMOS Output(ACE809N/810N) and Open Drain Output(ACE803N) 140ms min Reset Pulse Width 3.2μA Supply Current @VCC=3V Guaranteed Reset Valid to VCC = +1.15V Power Supply Transient Immunity Operating Temperature Range: -40°C to +85°C Application Computers Portable/Battery-Powered Equipment Intelligent Instruments Controllers Absolute Maximum Ratings Parameter Symbol Max Unit -0.3~6 V 20 mA Thermal resistance RESET, RESET θJA 300 ℃/W Operating Temperature TA -40~85 ℃ 4 KV VCC Terminal Voltage (With respect to GND) RESET, RESET VCC Input / Output Current ESD Rating (HBM) Storage Temperature TS -60 to 150 ℃ Note: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. VER 1.2 1 ACE803N/ACE809N/ACE810N Ultra Low Power Microprocessor Reset IC Packaging Type SOT-23-3 3 1 2 SOT-23-3 Description 1 GND RESET (ACE809N) 2 RESET (ACE810N) RESET (ACE803N) 3 Function Vcc Ground terminal CMOS Output. This output remains low if VCC drops below VRES, and for at least 140ms after VCC rises above VRES + VHYST CMOS Output. This output remains high if VCC drops below VRES, and for at least 140ms after VCC rises above VRES + VHYST Open Drain Output. This output remains low if VCC drops below VRES, and for at least 140ms after VCC rises above VRES + VHYST Analog Input. This pin is both the power supply to internal circuit and the voltage to be monitored Ordering information ACE803N/809N/810N X XX + H Halogen - free Pb - free BM: SOT-23-3 Voltage : L: 4.63V / M: 4.38V / J: 4.00V / T: 3.08V S: 2.93V / R: 2.63V VER 1.2 2 ACE803N/ACE809N/ACE810N Ultra Low Power Microprocessor Reset IC Device Function Reference Table: Part No. ACE809NL ACE810NL ACE809NM ACE810NM ACE809NJ ACE809NT ACE810NT ACE809NS ACE810NS ACE809NR ACE810NR Reset threshold Rest active Low or High Output Type Low CMOS High CMOS Low CMOS High CMOS Low CMOS Low CMOS High CMOS Low CMOS High CMOS Low CMOS High CMOS 4.63V 4.38V 4.00V 3.08V 2.93V 2.63V ACE803NS 2.93V Low Open Drain ACE803NR 2.63V Low Open Drain Block Diagram Block Diagram For CMOS Output VER 1.2 3 ACE803N/ACE809N/ACE810N Ultra Low Power Microprocessor Reset IC Electrical Characteristics Vcc=3V, TA=-40℃ to 85℃, Typical values are at TA=25℃,unless otherwise noted Parameter Symbol Input Voltage Vcc Supply Current Reset Threshold Reset Threshold hysteresis VCC to RESET Icc VRES Conditions 5.5 VCC=3.0V 3.2 6 VCC=5.0V 4.0 7.5 4.63 4.38 4.00 3.08 2.93 2.63 4.75 4.50 4.11 3.15 3.00 2.70 ACE8XXN-4.63 ACE8XXN-4.38 ACE8XXN-4.00 ACE8XXN-3.08 ACE8XXN-2.93 ACE8XXN-2.63 VRES+0.1V to VRES-0.1V VCC transitions from Delay(ACE810N) VRES+0.1V to VRES-0.1V VRES>VCC=2V,ISINK=1.5mA VRES>VCC=4V,ISINK=5mA RESET Output VRES<VCC=3V,ISRC=1.2mA VOH VRES<VCC=4V,ISRC=2mA (ACE809N) VRES<VCC=5V,ISRC=2.5mA RESET Output VRES<VCC=3V,ISINK=3.2mA Voltage Low VOL VRES<VCC=5V,ISINK=6mA RESET Output VRES>VCC=2V,ISRC=600uA VOH uA V V 20 us 20 us 0.3 VCC-0.4 V V 0.3 VRES>VCC=3V, ISRC=1.2mA VCC-0.4 V V VRES>VCC=4V, ISRC=2mA (ACE810N) Reset Pulse Width V 0.013VRES VRES<VCC=4V,ISINK=5mA (ACE810N) Voltage High 4.51 4.25 3.89 3.00 2.86 2.56 VRES>VCC=3V,ISINK=3.2mA (ACE803N/ACE809N) Voltage High 5.5 2.8 VCC transitions from VOL Max. Unit VCC=2.0V VHYST RESET Output Typ. 1.15 Delay(ACE803N/ACE809N) VCC to RESET Voltage Low Min. TRES 140 240 400 ms Note : Parts are 100% production tested at 25℃. Specifications over full temperature range are guaranteed by design VER 1.2 4 ACE803N/ACE809N/ACE810N Ultra Low Power Microprocessor Reset IC Detailed Description A microprocessor’s (μP’s) reset input starts the μP in a known state. The ACE803N/809N/810N series assert reset to prevent code-execution errors during power-up, power-down, or brownout conditions. The device consists of a comparator, a low current high precision voltage reference, voltage divider, output delay circuit and output driver. They assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. The ACE809N/810N have a CMOS output stage, the ACE803N has an open drain output stage. The ACE803N/809N have an active-low RESET output, while the ACE810N 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 1.15V over the temperature range. The operation of the device can be best understood by referring to figure 3. Fig. 2 Timing waveform Applications Information Negative-Going VCC Transients In addition to issuing a reset to the μP during power-up, power-down, and brownout conditions, the ACE803N/809N/810N series are relatively immune to short-duration negative-going VCC transients (glitches). 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 100mV below the reset threshold and lasts 10μs or less will not cause a reset pulse. A 0.1μF bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. VER 1.2 5 ACE803N/ACE809N/ACE810N Ultra Low Power Microprocessor Reset IC Ensuring a Valid Reset Output Down to VCC = 0 When VCC falls below 1.15V, the ACE809N 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 1.15V. However, in applications where RESET must be valid down to 0V, a pull-down resistor is needed from RESET pin to GND as shown in Figure 4, then RESET output will be held at low state. The resistor’s value is not critical, it should be about 100KΩ, large enough not to load RESET, small enough to pull RESET to ground. A 100KΩ pull-up resistor to VCC is also recommended for the ACE810N if active high RESET is required to remain valid for VCC < 1.15V. ACE809N Fig. 3 RESET Valid to Ground Circuit VER 1.2 6 ACE803N/ACE809N/ACE810N Ultra Low Power Microprocessor Reset IC Packing Information SOT-23-3 VER 1.2 7 ACE803N/ACE809N/ACE810N Ultra Low Power Microprocessor Reset IC 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 8