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X40430V14I-A Datasheet(PDF) 4 Page - Xicor Inc. |
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X40430V14I-A Datasheet(HTML) 4 Page - Xicor Inc. |
4 / 24 page X40430/X40431 – Preliminary Information Characteristics subject to change without notice. 4 of 24 REV 1.2.3 11/28/00 www.xicor.com Low Voltage VCC (V1 Monitoring) During operation, the X40430 monitors the VCC level and asserts RESET if supply voltage falls below a pre- set minimum VTRIP1. The 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. The V2FAIL signal remains active until the V2MON drops below 1V (V2MON falling). It also remains active until V2MON returns and exceeds VTRIP2 by 0.2V. Low Voltage V3 Monitoring The X40430 also monitors a third voltage level and asserts V3FAIL if the voltage falls below a preset mini- mum VTRIP3. The V3FAIL 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. The V3FAIL signal remains active until the V3MON drops below 1V (V3MON falling). It also remains active until V3MON returns and exceeds VTRIP3 by 0.2V. 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 volt- age. There is no power up delay circuitry (tPURST) on this pin. Figure 2. Two Uses of Multiple Voltage Monitoring Unreg. Supply VCC 5V Reg V2MON X40430 Resistors selected so 3V appears on V2MON when unregulated supply reaches 6V. Unreg. Supply VCC X40431 RESET V2FAIL System VCC Reset RESET V2FAIL System Reset Notice: No external components required to monitor three voltages. R R V3MON V3FAIL V2MON V3MON V2MON 5V Reg 4V Reg 3V Reg V2MON |
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