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X40434V14-A Datasheet(PDF) 4 Page - Intersil Corporation |
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X40434V14-A Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 24 page 4 FN8251.0 July 29, 2005 Low Voltage VCC (V1 Monitoring) During operation, the X40430, X40431, X40434, X40435 monitors the VCC level and asserts RESET/RESET if supply voltage falls below a preset minimum VTRIP1. The RESET/RESET signal prevents the microprocessor from operating in a power fail or brownout condition. The RESET/RESET signal remains active until the voltage drops below 1V. It also remains active until VCC returns and exceeds VTRIP1 for tPURST. Low Voltage V2 Monitoring The X40430 also monitors a second voltage level and asserts V2FAIL if the voltage falls below a preset mini- mum VTRIP2. The V2FAIL signal is either ORed with RESET to prevent the microprocessor from operating in a power fail or brownout condition or used to inter- rupt the microprocessor with notification of an impend- ing power failure. For the X40430 and X40431 the V2FAIL signal remains active until the V2MON drops below 1V (V2MON falling). It also remains active until V2MON returns and exceeds VTRIP2. This voltage sense cir- cuitry monitors the power supply connected to V2MON pin. If VCC = 0, V2MON can still be monitored. For the X40434 and X40435, the V2FAIL signal remains active until VCC drops below 1V and remains active until V2MON returns and exceeds VTRIP2. This sense circuitry is powered by VCC. If VCC = 0, V2MON cannot be monitored. Low Voltage V3 Monitoring The X40430, X40431, X40434, X40435 also monitors a third voltage level and asserts V3FAIL if the voltage falls below a preset minimum VTRIP3. The V3FAIL sig- nal is either ORed with RESET to prevent the micro- processor from operating in a power fail or brownout condition or used to interrupt the microprocessor with notification of an impending power failure. The V3FAIL signal remains active until the V3MON drops below 1V (V3MON falling). It also remains active until V3MON returns and exceeds VTRIP3. This voltage sense circuitry monitors the power supply connected to V3MON pin. If VCC = 0, V3MON can still be monitored. Early Low VCC Detection (LOWLINE) This CMOS output goes LOW earlier than RESET/RESET whenever VCC falls below the VTRIP1 voltage and returns high when VCC exceeds the VTRIP1 voltage. There is no power-up delay circuitry (tPURST) on this pin. Figure 2. Two Uses of Multiple Voltage Monitoring 6-10V VCC 5V V3MON X40431-A Unreg. Supply VCC X40431-B RESET V2FAIL System VCC Reset V2FAIL V3FAIL System Reset Notice: No external components required to monitor three voltages. 1M V3MON V3FAIL V2MON 5V Reg 3.0V Reg 1.8V Reg 3.3V 390K V2MON RESET Power Fail Interrupt VCC (1.7V) X40430, X40431, X40434, X40435 |
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