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MAX6338GUB Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX6338GUB Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 8 page _______________Detailed Description The MAX6338 is a low-power (25µA), quad voltage monitor designed for multivoltage systems. Preset volt- age options for +5.0V, +3.3V, +3.0V, +2.5V, +1.8V, and -5.0V make these quad monitors ideal for applications such as telecommunications, desktop and notebook computers, high-end printers, data storage equipment, and networking equipment. The MAX6338 has an internally trimmed threshold that minimizes or eliminates the need for external compo- nents. The four open-drain outputs have weak (10µA) internal pullups to VCC, allowing them to interface easily with other logic devices. The MAX6338 can monitor power supplies with either 5% or 10% tolerance specifi- cations, depending on the selected version. An addi- tional high-input-impedance comparator option can be used as an adjustable voltage monitor, general-pur- pose comparator, or digital level translator. The weak internal pullups can be overdriven by external pullups to any voltage from 0 to +5.5V. Internal circuitry prevents current flow from the external pullup voltage to VCC. The outputs can be wire-ORed for a single “power good” signal. The MAX6338 has either one or two auxiliary inputs and two or three factory-programmed threshold voltages, or four fixed voltages. The inverting input of all compara- tors is connected to a 1.23V bandgap reference for all positive voltages. The noninverting terminals are acces- sible through internal resistive voltage-dividers with preset factory threshold voltages. In the case of auxil- iary (AUX) input, the positive terminal of the comparator is accessible directly for setting the threshold for the monitored voltage. When any of the inputs (IN1–IN4) are higher than the threshold level, the output is high. The output goes low as the input drops below the threshold voltage monitor. The undervoltage lockout circuitry remains active and the outputs remain low with VCC down to 1V (Figure 1). Applications Information Hysteresis When the voltage on one comparator input is at or near the voltage on the other input, ambient noise generally causes the comparator output to oscillate. The most common way to eliminate this problem is through hys- teresis. When the two comparator input voltages are equal, hysteresis causes one comparator input voltage to move quickly past the other, thus taking the input out of the region where oscillation occurs. Standard com- parators require hysteresis to be added through the use of external resistors. The external resistive network usually provides a positive feedback to the input in order to cause a jump in the threshold voltage when Quad Voltage Monitor in µMAX Package 4 _______________________________________________________________________________________ Pin Description PIN NAME FUNCTION 1 IN1 Input Voltage 1. See Selector Guide for monitored voltages. 2 IN2 Input Voltage 2. See Selector Guide for monitored voltages. 3 IN3 Input Voltage 3. See Selector Guide for monitored voltages. 4 IN4 Input Voltage 4. See Selector Guide for monitored voltages. 5 GND Ground 6 OUT4 Output 4. OUT4 goes low when VIN4 falls below its absolute threshold. OUT4 is open drain with a 10µA internal pullup to VCC. 7 OUT3 Output 3. OUT3 goes low when VIN3 falls below its absolute threshold. OUT3 is open drain with a 10µA internal pullup to VCC. 8 OUT2 Output 2. OUT2 goes low when VIN2 falls below its absolute threshold. OUT2 is open drain with a 10 µA internal pullup to VCC. 9 OUT1 Output 1. OUT1 goes low when VIN1 falls below its absolute threshold. OUT1 is open drain with a 10 µA internal pullup to VCC. 10 VCC Power Supply. Connect VCC to a +2.5V to +5.5V supply. An undervoltage lockout circuit forces all OUT_ pins low when VCC drops below 2.5V. |
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