Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT AZ809A General Description Features The AZ809A is a precision system supervisor and reset circuit designed to monitor the power supplies in microprocessor and digital system. It provides a reset signal to the host processor during power-up, powerdown, and brownout conditions. · · · · · · The AZ809A has an active-low RESET output, three standard reset options are offered to support 5V, 3.3V, and 3.0V system.Whenever the system supply voltage declines below the internal fixed reset threshold, the AZ809A asserts a reset signal and the reset signal remains asserted for 240mS after VCC rises above the threshold. · · Precise Monitoring of 3.0V, 3.3V, and 5.0V Supply Voltages 140ms Minimum Reset Pulse Width Active-low RESET Output Push-Pull RESET Output No External Components Reset Valid Down to VCC=1.0V Power Supply Fast Transient Immunity Specified Over Full Temperature Range: -40 to 105oC Applications The AZ809A has a push-pull output, no external components are required. The output is guaranteed to be in the correct state at VCC level as low as 1V. The AZ809A is optimized to reject fast transient glitches on the VCC line. When the VCC is 3.3V, the supply current consumption is about 6µA typically. · · · · · · · · · The IC is available in SOT-23 package. Microprocessor Systems Portable/Battery-Powered Systems Embedded Controllers Automotive Intelligent Instruments Wireless Communication Systems PDAs and Handheld Equipment Set-Top Boxes ADSL Modems SOT-23 Figure 1. Package Type of AZ809A Jan. 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT AZ809A Pin Configuration N Package (SOT-23) VCC 2 RESET 1 GND 3 Figure 2. Pin Configuration of AZ809A (Top View) Pin Description Pin Number Pin Name 1 GND 2 RESET 3 VCC Function Ground pin Active low output. The RESET is asserted LOW if VCC falls below the reset threshold and remains LOW for the 240ms typical reset timeout period (140ms minimum) after VCC exceeds the threshold Power supply input voltage (3.0V, 3.3V, 5.0V) Jan. 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT AZ809A Functional Block Diagram VCC GND Reset Logic + Timer 3 2 RESET 1 Oscillator Reference Voltage Figure 3. Functional Block Diagram of AZ809A Ordering Information AZ809A - Circuit Type E1: Lead Free TR: Tape and Reel Package N: SOT-23 Package Temperature Range SOT-23 -40 to 105oC Reset Threshold: L: 4.63V S: 2.93V R: 2.63V Reset Threshold 4.63V Part Number AZ809ANLTR-E1 Marking ID EH7 2.93V AZ809ANSTR-E1 EH1 2.63V AZ809ANRTR-E1 EH6 Packing Type Tape & Reel BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Jan. 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT AZ809A Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit VCC -0.3 to 6 V -0.3 to VCC+0.3 V Input Current, VCC Pin 20 mA Output Current, RESET Pin 20 mA Rate of Rise, VCC 100 V/µs Continuous Power Dissipation 320 mW o Supply Voltage RESET Junction Temperature TJ 150 Storage Temperature TSTG -65 to 150 oC Lead Temperature (Soldering, 10sec) TLEAD 260 oC ESD (Human Body Model) 6000 V ESD (Machine Model) 400 V C Note 1: Stresses greater than 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 under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Supply Voltage Operating Ambient Temperature Range Symbol Min Max VCC 1 5.5 V TA -40 105 o Jan. 2008 Rev. 1. 0 Unit C BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT AZ809A Electrical Characteristics (VCC is over the full voltage range, TA=-40oC to 105oC, unless otherwise noted. Typical values at TA=25oC, VCC=5V for L device, VCC=3.3V for S device and VCC=3V for R device.)(Note 2) Parameter Input Voltage (VCC) Range Symbol VCC Conditions Min TA=0oC to 85oC o o TA=-40 C to 105 C Typ Max 1.0 5.5 1.2 5.5 TA=-40oC to 85oC, VCC<5.5V 7 Unit V 11 L Devices TA=-40oC to 105oC, VCC<5.5V Supply Current 12 ICC o o 6 TA=-40 C to 85 C, VCC<3.6V µA 10 R/S Devices TA=-40oC to 105oC, VCC<3.6V 4.56 TA=25oC L Devices TA =-40oC to R Devices 4.86 TA=25 C 2.89 TA=-40oC to 85oC 2.85 3.00 TA=-40oC to 105oC 2.78 3.08 TA=25oC 2.59 o S Devices 4.70 4.75 4.40 o TA=-40 C to 105 C VTH 4.63 4.50 85oC o Reset Threshold 11 TA =-40oC to 2.93 2.63 2.96 2.66 85oC 2.55 2.70 o 2.50 2.76 o TA=-40 C to 105 C V Reset Threshold Temperature Coefficient TA=-40oC to 105oC 30 ppm/oC VCC to Reset Delay VCC=VTH to VTH-100mV 20 µs Reset Active Timeout Period TA=-40oC to 85oC 140 TA=-40oC to 105oC R/S Devices VCC=VTH(min), ISINK=1.2mA 100 Low RESET Output Voltage VOL L Devices VOH L Devices VCC>VTH(max), ISOURCE=800µA ms 840 0.4 VCC>1.1V, ISINK=50µA High RESET Output Voltage 560 0.3 VCC=VTH(min), ISINK=3.2mA V >V (max), R/S Devices CC TH ISOURCE=500µA 240 V 0.3 0.8VCC V VCC1.5 Note 2. Production testing done at TA=25oC. Over temperature specifications guaranteed by design only. Jan. 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT AZ809A Typical Performance Characteristics 12 No Load 340 Power-up Reset Timeout Period (ms) 11 10 VCC=5V Supply Current (µA) 9 8 7 VCC=3.3V 6 5 4 3 2 VCC=1V 1 0 -40.0 -20.0 0.0 20.0 40.0 60.0 80.0 100.0 320 300 280 260 240 220 200 -40.0 120.0 -20.0 0.0 o 60.0 80.0 100.0 120.0 Figure 5. Power-up Reset Timeout vs. Temperature 240 1.004 VCC=VTH to VTH-VOD 1.003 200 180 Normalized Threshold Power-Down Reset Delay (µs) 40.0 Temperature ( C) Figure 4. Supply Current vs. Temperature 220 20.0 o Temperature ( C) 160 140 VOD=10mV 120 100 VOD=20mV 80 60 VOD=100mV VOD=200mV 40 1.002 1.001 1.000 0.999 0.998 20 0 -40.0 -20.0 0.0 20.0 40.0 60.0 80.0 100.0 0.997 -40.0 120.0 o -20.0 0.0 20.0 40.0 60.0 80.0 100.0 120.0 o Temperature ( C) Temperature ( C) Figure 7. Normalized Reset Threshold vs. Temperature Figure 6. Power-down Reset Delay vs. Temperature Jan. 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT AZ809A Typical Performance Characteristics (Continued) 400 400 Maximum Transient Duration (µs) 360 Maximum Transient Duration (µs) L Device 320 280 240 200 160 Reset Occurs above the Curve 120 80 360 S Device 320 280 240 200 160 Reset Occurs above the Curve 120 80 40 40 0 0 10 2 100 2 1000 10 100 1000 Reset Comparator Overdrive VTH-VCC (mV) Reset Comparator Overdrive VTH-VCC (mV) Figure 8. Maximum Transient Duration NOT Causing Figure 9. Maximum Transient Duration NOT Causing a Reset Pulse vs. Reset Comparator Overdrive a Reset Pulse vs. Reset Comparator Overdrive 400 Maximum Transient Duration (µs) 360 R Device 320 280 240 200 160 Reset Occurs above the Curve 120 80 40 0 2 10 100 1000 Reset Comparator Overdrive VTH-VCC (mV) Figure 10. Maximum Transient Duration NOT Causing a Reset Pulse vs. Reset Comparator Overdrive Jan. 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT AZ809A Operating Diagram VCC VTH VCC (min) Time RESET 20 µ A Typical 240mS Typical 240mS Typical Reset Active Timeout Period Output Undefined Time The AZ809A asserts a reset signal LOW whenever the VCC supply voltage is below the threshold voltage and remains asserted for 240ms typically after the VCC has risen above the threshold. Figure 11. Reset Timing Diagram of AZ809A Application Information Valid RESET with VCC under 1.0 V The AZ809A RESET output is valid to VCC=1.0V. Below this voltage, the output becomes an open circuit and doesn't sink current. Therefore, high-impedance CMOS logic input connected to RESET can drift to undetermined voltages. VCC AZ809A To ensure that the AZ809A RESET is in a known state when VCC is under 1.0V, a 100KΩ pull-down resistor between the RESET pin and GND is recommended to discharge stray capacitances and maintain the output low. RESET GND R1 100kΩ Figure 12. RESET Valid to VCC=0V Jan. 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT AZ809A Application Information (Continued) Negative Going VCC Transient The AZ809A is optimized to immune fast negativegoing transients or glitches on the VCC line, and the sensitivity depends on the duration of the transient and the magnitude of the undershoot below the reset threshold (reset comparator overdrive). Figure 13 shows the maximum pulse width of a negative-going VCC transient that will not cause a reset pulse. As the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. Any combination of duration and overdrive that lies under the curve will not generate a reset signal, typically, a VCC transient that goes 100mV below the reset threshold and lasts about 20µs or less will not cause a reset pulse. 400 VCC Maximum Transient Duration (µs) 360 VTH 320 Overdrive 280 240 Duration 200 160 Reset Occurs above the Curve 120 80 40 0 10 2 100 1000 Reset Comparator Overdrive VTH-VCC (mV) A 0.1µF bypass capacitor mounted as close as possible to the VCC pin will provide additional transient rejection. Figure 13. Maximum Transient Duration NOT Causing a Reset Pulse vs. Reset Comparator Overdrive Typical Application VCC VCC VCC AZ809A Microprocessor RESET RESET GND GND Figure 14. Typical Application of AZ809A Jan. 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT AZ809A Mechanical Dimensions SOT-23 3.0 ° 7.0° R0.100(0.004) 0.900(0.035) 1.100(0.043) 7.0° 0.0°~10.0° 0.020(0.001) 0.100(0.004) 0.200(0.008)MIN 2.800(0.110) 3.000(0.118) 0.080(0.003) 0.150(0.006) 0.550(0.022)REF 1.200(0.047) 1.400(0.055) 2.300(0.091) 2.500(0.098) 0.920(0.036) 0.980(0.039) 0.100(0.004) GAUGE PLANE 4×R0.100(0.004) 0.500(0.020) 0.700(0.028) 2.0° 1.050(0.041)REF Unit: mm(inch) 0.390(0.015) 0.450(0.018) 1.900(0.075)REF Jan. 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 10 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. 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