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CAT706ZI-G Datasheet(PDF) 10 Page - Catalyst Semiconductor |
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CAT706ZI-G Datasheet(HTML) 10 Page - Catalyst Semiconductor |
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10 / 14 page  CAT705, CAT706, CAT813 Doc. No. MD-3030 Rev. A 10 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice APPLICATION NOTES µP’s with Bidirectional Reset Pins The RESET ¯¯¯¯¯¯ output can be pulled low by processors like the 68HC11 allowing for a system reset issued by the processor. The maximum pullup current that can be sourced by the CAT705 & CAT706 1.5mA (and by the CAT706 T/R/S is 800µA) allowing the processor to pull the output low even when the CAT70x is pulling it high. Power Transients Generally short duration negative-going transients of less than 2µs on the power supply at VRST minimum will not cause a reset condition. However the lower the voltage of the transient the shorter the required time to cause a reset output. These issues can usually be remedied by the proper location of bypass capacitance on the circuit board. OUTPUT VALID CONDITIONS The RESET ¯¯¯¯¯¯ output uses a push-pull output which can maintain a valid output down to a V CC of 1.0 volts. To sink current below 0.8V a resistor can be connected from RESET ¯¯¯¯¯¯ to Ground (see Figure 8.) This arrangement will maintain a valid value on the RESET ¯¯¯¯¯¯ output during both power up and down but will draw current when the RESET ¯¯¯¯¯¯ output is in the high state. A resistor value of about 100kΩ should be adequate in most situations to maintain a low condition valid output down to VCC equal to 1.0V. Figure 8. RESET ¯¯¯¯¯¯ Valid for VCC < 1.0V Figure 9. Typical Operating Circuit µC RESET/RESET WDO PFO VCC WDI GND PFI MR RESET/RESET CAT705 CAT706 CAT813 100kΩ µC RESET/RESET I/O LINE INTERRUPT NMI VCC WDO PFO VCC Push Switch 5V WDI GND PFI MR CAT705 CAT706 CAT813 RESET/RESET UNREGULATED DC |
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Similar Description - CAT706ZI-G |
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