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APR3012-43A Datasheet(PDF) 9 Page - Anpec Electronics Coropration |
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APR3012-43A Datasheet(HTML) 9 Page - Anpec Electronics Coropration |
9 / 15 page Copyright ANPEC Electronics Corp. Rev. A.2 - Oct., 2003 APR3011/2/3 www.anpec.com.tw 9 Application Information VCC Transient Rejection The APR3011/2/3 have the function to reject the tran- sient glitches from the power line. The Maximum Tran- sient Duration vs. Reset Threshold Overdrive shows at Typical Characteristics.The transient voltage with the duration under the curve will not generate a reset signal, e.g. a transient of 100mV below the reset threshold voltage have the duration more than 35us, it will generate a reset signal. Connect a 0.1uF bypass capacitor to the VCC pin can improve the transient immunity. Reset Output The APR3011/2/3 have 3 output stage versions: APR3001 is an active low push-pull output, when the VCC drops below the reset threshold, the RESET out- put generates a low signal. APR3012 is an active high push-pull output, when the VCC drops below the reset threshold, the RESET output generates a high signal (see Timing Chart). APR3013 is an active low open drain output, the RESET output must be connected a pull-up resistor to a supply voltage that is lower than 6V, it suits to use in multiple voltage systems (see Figure 2). The APR3011 RESET output is valid until the VCC=1.2V, below 1.2V the IC is shutdown, and the output becomes a floating state. If it is a trouble, a resistor should be connected from reset output to ground to keep the reset output low (see Figure 1). For The APR3012, a pull-up resistor to VCC is required to keep the valid reset output for VCC below 1.2V. RESET VCC GND VCC 100K Figure 1. Ensuring RESET Valid to VCC = 0 V VCC APR3013 RESET GND +3.3V +5.0V VCC GND RESET INPUT 5V System 100k Figure 2. APR3013 Open Drain Output with Multiple Supplies |
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