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MAX6899PAZT+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX6899PAZT+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 15 page Ultra-Small, Adjustable Sequencing/Supervisory Circuits ______________________________________________________________________________________ 11 Pullup Resistor Values (MAX6897/MAX6898) The exact value of the pullup resistors for the open- drain outputs is not critical, but some consideration should be made to ensure the proper logic levels when the device is sinking current. For example, if VCC = 2.25V and the pullup voltage is 28V, you would try to keep the sink current less than 0.5mA as shown in the Electrical Characteristics table. As a result, the pullup resistor should be greater than 56k Ω. For a 12V pullup, the resistor should be larger than 24k Ω. It should be noted that the ability to sink current is dependent on the VCC supply voltage. Typical Application Circuits Figures 8, 9, 10 show typical applications for the MAX6895–MAX6899. Figure 8 shows the MAX6895 used with a p-channel MOSFET in an overvoltage pro- tection circuit. Figure 9 shows the MAX6895 in a low- voltage sequencing application using an n-channel MOSFET. Figure 10 shows the MAX6895 used in a mul- tiple-output sequencing application. Using an n-Channel Device for Sequencing In higher power applications, using an n-channel device reduces the loss across the MOSFETs as it offers a lower drain-to-source on-resistance. However, an n- channel MOSFET requires a sufficient VGS voltage to fully enhance it for a low RDS_ON. The application in Figure 9 shows the MAX6895 in a switch sequencing application using an n-channel MOSFET. Similarly, if a higher voltage is present in the system, the open-drain version can be used in the same manner. Figure 8. Overvoltage Protection MAX6897 ENABLE GND VCC P 3.3V ALWAYS ON OUT R1 0 TO 28V RPULLUP R2 IN CDELAY MAX6895 ENABLE GND VCC 5V BUS OUT R1 R2 IN CDELAY CCDELAY 1.2V INPUT 1.2V OUTPUT N MONITORED 3.3V Figure 9. Low-Voltage Sequencing Using an n-Channel MOSFET |
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