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MAX6896PAZT+ Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6896PAZT+ Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 18 page Ultra-Small, Adjustable Sequencing/Supervisory Circuits 6 _______________________________________________________________________________________ Detailed Description The MAX6895–MAX6899 is a family of ultra-small, low- power, sequencing/supervisory circuits. These devices provide adjustable voltage monitoring for inputs down to 0.5V. They are ideal for use in power-supply sequenc- ing, reset sequencing, and power-switching applica- tions. Multiple devices can be cascaded for complex sequencing applications. Voltage monitoring is performed through a high-imped- ance input (IN) with an internally fixed 0.5V threshold. When the voltage at IN falls below 0.5V or when the enable input is deasserted (ENABLE = low or ENABLE = high), the output deasserts (OUT goes low or OUT goes high). When VIN rises above 0.5V and the enable input is asserted (ENABLE = high or ENABLE = low), the output asserts (OUT goes high or OUT goes low) after a capaci- tor-programmable time delay. With VIN above 0.5V, the enable input can be used to turn the output on or off. After the enable input is assert- ed, the output turns on with a capacitor-programmable delay period (A version) or with a 150ns propagation delay (P version). Tables 1, 2, and 3 detail the output state depending on the various input and enable condi- tions. Supply Input (VCC) The device operates with a VCC supply voltage from 1.5V to 5.5V. To maintain a 1.8% accurate threshold, VCC must be above 1.5V. When VCC falls below the UVLO threshold, the output deasserts. When VCC falls below 1.2V the output state cannot be determined. For noisy systems, connect a 0.1µF ceramic capacitor from VCC to GND as close to the device as possible. For the push-pull active-high output option, a 100kΩ external pulldown resistor to ground ensures the correct logic state for VCC down to 0. MAX6895 MAX6899 LOGIC 1.0V 250nA 0.5V IN OUT CDELAY GND ENABLE (MAX6895) ENABLE (MAX6899) VCC IN ENABLE OUT VIN < VTH Low Low VIN < VTH High Low VIN > VTH Low Low OUT = VCC (MAX6895) VIN > VTH High OUT = high impedance (MAX6897) Figure 1. MAX6895/MAX6899 Functional Diagram Table 1. MAX6895/MAX6897 Output IN ENABLE OUT OUT = VCC (MAX6896) VIN < VTH Low OUT = high impedance (MAX6898) OUT = VCC (MAX6896) VIN < VTH High OUT = high impedance (MAX6898) VIN > VTH Low Low OUT = VCC (MAX6896) VIN > VTH High OUT = high impedance (MAX6898) Table 2. MAX6896/MAX6898 Output IN ENABLE OUT VIN < VTH Low Low VIN < VTH High Low VIN > VTH Low High VIN > VTH High Low Table 3. MAX6899 Output |
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