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| Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT General Description 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. 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 6A typically. The IC is available in SOT-23 package. AZ809A Features * * * * * * * * 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 * * * * * * * * * 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 1 BCD Semiconductor Manufacturing Limited Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT Pin Configuration N Package (SOT-23) AZ809A 2 VCC 3 1 RESET GND Figure 2. Pin Configuration of AZ809A (Top View) Pin Description Pin Number 1 2 Pin Name GND RESET 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) Function 3 VCC Jan. 2008 Rev. 1. 0 2 BCD Semiconductor Manufacturing Limited Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT Functional Block Diagram AZ809A VCC 3 Reset Logic + Timer 2 RESET GND 1 Reference Voltage Oscillator Figure 3. Functional Block Diagram of AZ809A Ordering Information AZ809A Circuit Type E1: Lead Free TR: Tape and Reel Package N: SOT-23 Reset Threshold: L: 4.63V S: 2.93V R: 2.63V Package SOT-23 Temperature Range -40 to 105oC Reset Threshold 4.63V 2.93V 2.63V Part Number AZ809ANLTR-E1 AZ809ANSTR-E1 AZ809ANRTR-E1 Marking ID EH7 EH1 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 3 BCD Semiconductor Manufacturing Limited Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT Absolute Maximum Ratings (Note 1) Parameter Supply Voltage RESET Input Current, VCC Pin Output Current, RESET Pin Rate of Rise, VCC Continuous Power Dissipation Junction Temperature Storage Temperature Lead Temperature (Soldering, 10sec) ESD (Human Body Model) ESD (Machine Model) TJ TSTG TLEAD Symbol VCC Value -0.3 to 6 -0.3 to VCC+0.3 20 20 100 320 150 -65 to 150 260 6000 400 Unit V V mA mA V/s mW o AZ809A C oC oC V V 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 VCC TA Min 1 -40 Max 5.5 105 Unit V o C Jan. 2008 Rev. 1. 0 4 BCD Semiconductor Manufacturing Limited Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT 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 TA=0oC to 85oC TA=-40 C to 105 C TA=-40oC to 85oC, VCC<5.5V L Devices TA=-40oC to 105oC, VCC<5.5V Supply Current ICC TA=-40 C to 85 C, VCC<3.6V R/S Devices TA=-40oC to 105oC, VCC<3.6V TA=25oC L Devices TA =-40oC o o o o o o AZ809A Conditions Min 1.0 1.2 Typ Max 5.5 5.5 Unit V 7 11 12 A 6 10 11 4.56 to 85oC o 4.63 4.70 4.75 4.86 4.50 4.40 2.89 2.85 2.78 2.59 2.63 2.93 TA=-40 C to 105 C TA=25 C Reset Threshold VTH S Devices TA=-40oC to 85oC TA=-40oC to 105oC TA=25oC R Devices TA =-40oC o 2.96 3.00 3.08 2.66 2.70 2.76 V to 85oC o 2.55 2.50 30 20 140 100 0.3 0.4 0.3 0.8VCC 240 TA=-40 C to 105 C Reset Threshold Temperature Coefficient VCC to Reset Delay Reset Active Timeout Period TA=-40oC to 105oC VCC=VTH to VTH-100mV TA=-40oC to 85oC TA=-40oC to 105oC R/S Devices VCC=VTH(min), ISINK=1.2mA Low RESET Output Voltage VOL L Devices VCC=VTH(min), ISINK=3.2mA VCC>1.1V, ISINK=50A V >V (max), R/S Devices CC TH ISOURCE=500A L Devices VCC>VTH(max), ISOURCE=800A ppm/oC s 560 840 V ms High RESET Output Voltage VOH V VCC1.5 Note 2. Production testing done at TA=25oC. Over temperature specifications guaranteed by design only. Jan. 2008 Rev. 1. 0 5 BCD Semiconductor Manufacturing Limited Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT Typical Performance Characteristics AZ809A 12 11 10 9 No Load Power-up Reset Timeout Period (ms) 120.0 340 320 300 280 260 240 220 200 -40.0 VCC=5V Supply Current (A) 8 7 6 5 4 3 2 1 0 -40.0 -20.0 0.0 20.0 40.0 60.0 o VCC=3.3V VCC=1V 80.0 100.0 -20.0 0.0 20.0 40.0 60.0 o 80.0 100.0 120.0 Temperature ( C) Temperature ( C) Figure 4. Supply Current vs. Temperature Figure 5. Power-up Reset Timeout vs. Temperature 240 220 1.004 VCC=VTH to VTH-VOD 1.003 Power-Down Reset Delay (s) 200 180 Normalized Threshold 160 140 120 100 80 60 40 20 0 -40.0 -20.0 0.0 20.0 40.0 60.0 o 1.002 VOD=10mV 1.001 1.000 VOD=20mV VOD=100mV VOD=200mV 0.999 0.998 80.0 100.0 120.0 0.997 -40.0 -20.0 0.0 20.0 40.0 60.0 o 80.0 100.0 120.0 Temperature ( C) Temperature ( C) Figure 6. Power-down Reset Delay vs. Temperature Figure 7. Normalized Reset Threshold vs. Temperature Jan. 2008 Rev. 1. 0 6 BCD Semiconductor Manufacturing Limited Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT Typical Performance Characteristics (Continued) AZ809A 400 400 Maximum Transient Duration (s) Maximum Transient Duration (s) 360 320 280 240 200 160 120 80 40 0 2 L Device 360 320 280 240 200 160 120 80 40 0 S Device Reset Occurs above the Curve Reset Occurs above the Curve 10 100 1000 2 10 100 1000 Reset Comparator Overdrive VTH-VCC (mV) Reset Comparator Overdrive VTH-VCC (mV) Figure 8. Maximum Transient Duration NOT Causing a Reset Pulse vs. Reset Comparator Overdrive Figure 9. Maximum Transient Duration NOT Causing a Reset Pulse vs. Reset Comparator Overdrive 400 360 R Device Maximum Transient Duration (s) 320 280 240 200 160 120 80 40 0 2 Reset Occurs above the Curve 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 7 BCD Semiconductor Manufacturing Limited Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT Operating Diagram VCC AZ809A VTH VCC (min) Time RESET 20 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. To ensure that the AZ809A RESET is in a known state when VCC is under 1.0V, a 100K pull-down resistor between the RESET pin and GND is recommended to discharge stray capacitances and maintain the output low. VCC AZ809A RESET GND R1 100k Figure 12. RESET Valid to VCC=0V Jan. 2008 Rev. 1. 0 8 BCD Semiconductor Manufacturing Limited Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT 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 20s or less will not cause a reset pulse. A 0.1F bypass capacitor mounted as close as possible to the VCC pin will provide additional transient rejection. 400 AZ809A VCC 360 Maximum Transient Duration (s) VTH 320 280 240 200 160 120 80 40 0 2 Duration Overdrive Reset Occurs above the Curve 10 100 1000 Reset Comparator Overdrive VTH-VCC (mV) 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 9 BCD Semiconductor Manufacturing Limited Preliminary Datasheet 3-PIN MICROPROCESSOR RESET CIRCUIT Mechanical Dimensions SOT-23 Unit: mm(inch) AZ809A 3.0 0.500(0.020) 0.700(0.028) 4xR0.100(0.004) 0.100(0.004) GAUGE PLANE 7.0 0.900(0.035) 1.100(0.043) R0.100(0.004) 2.0 1.050(0.041)REF 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) 0.550(0.022)REF 7.0 0.080(0.003) 0.150(0.006) 2.300(0.091) 2.500(0.098) 1.200(0.047) 1.400(0.055) 0.920(0.036) 0.980(0.039) 0.390(0.015) 0.450(0.018) 1.900(0.075)REF Jan. 2008 Rev. 1. 0 10 BCD Semiconductor Manufacturing Limited 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. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or other rights nor the rights of others. MAIN SITE BCD Semiconductor Manufacturing Limited - Wafer Fab Shanghai SIM-BCD Semiconductor Manufacturing Limited 800, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6485 1491, Fax: +86-21-5450 0008 BCD Semiconductor Manufacturing Limited - IC Design Group Advanced Analog Circuits (Shanghai) Corporation 8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6495 9539, Fax: +86-21-6485 9673 REGIONAL SALES OFFICE Shenzhen Office Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd. Shenzhen Office Advanced Analog Circuits (Shanghai) Corporation Shenzhen Office Room E, 5F, Noble Center, No.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China Tel: +86-755-8826 7951 Fax: +86-755-8826 7865 Taiwan Office BCD Semiconductor (Taiwan) Company Limited 4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei, Taiwan Tel: +886-2-2656 2808 Fax: +886-2-2656 2806 USA Office BCD Semiconductor Corporation 30920 Huntwood Ave. Hayward, CA 94544, U.S.A Tel : +1-510-324-2988 Fax: +1-510-324-2788 |
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