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SS8037H400GT71 Datasheet(PDF) 8 Page - Silicon Standard Corp. |
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SS8037H400GT71 Datasheet(HTML) 8 Page - Silicon Standard Corp. |
8 / 9 page www.SiliconStandard.com 8 of 9 Figure 3. Interfacing to µPs with bidirectional reset I/O Figure 4. SS8038L open-drain RESET output allows use with multiple supplies Interfacing to µPs with Bidirectional Reset Pins Since the RESET output on the SS8038L is open drain, this device interfaces easily with µPs that have bidirec- tional reset pins, such as the Motorola 68HC11. Con- necting the µP supervisor’s RESET output directly to the microcontroller’s (µC’s) RESET pin with a single pull-up resistor allows either device to assert reset (Fig- ure 3). 8038L Open-Drain RESET Output Allows Use with Multiple Supplies Generally, the pull-up connected to the SS8038L will connect to the supply voltage that is being monitored at the IC’s VCC pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply (Figure 4). Note that as the SS8038L’s V CC decreases below 1V, so does the IC’s ability to sink current at RESET . Also, with any pull-up, RESET will be pulled high as VCC de- cays toward 0. The voltage where this occurs depends on the pull-up resistor value and the voltage to which it is connected. Benefits of Highly Accurate Reset Threshold Most µP supervisor ICs have reset threshold voltages between 5% and 10% below the value of nominal supply voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. When using ICs rated at only the nominal supply ±5%, this leaves a zone of uncertainty where the supply is be- tween 5% and 10% low, and where the reset may or may not be asserted. The SS803xx463/803xx308 use highly accurate circuitry to ensure that reset is asserted close to the 5% limit, and long before the supply has declined to 10% below nomi- nal. RESET INPUT GND µP V CC RESET GND V CC V CC MOTOROLA 68HCXX RPULL-UP RESET INPUT GND µP V CC RESET GND 8038 V CC V CC MOTOROLA 68HCXX RPULL-UP RESET INPUT GND 5V SYSTEM V CC RESET GND V CC RPULL-UP +3.3V +5.0V RESET INPUT GND 5V SYSTEM V CC RESET GND 8038 V CC RPULL-UP +3.3V +5.0V SS8037/8(G) 10/6/2004 Rev.2.20 |
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