MAX697EPE+

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Multi-Voltage Supervisor
Number of Voltages Monitored:	2
Output:	Push-Pull, Push-Pull
Reset:	Active High/Active Low
Reset Timeout:	35 ms Minimum
Voltage - Threshold:	Adjustable/Selectable
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Through Hole
Package / Case:	16-DIP (0.300", 7.62mm)
Supplier Device Package:	16-PDIP
Base Part Number:	MAX697

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Introduction

MAX697EPE+ is a low-power and highly efficient Supervisor IC designed for low-power/battery-powered applications like cell phones, PDAs, Timing and Wireless applications. It features a wide input voltage range (1.7V to 5.5V), small footprint, Faster power-up/power-down times and higher thermal performance. This article will discuss the applications field and working principle of the MAX697EPE+.

Applications

The MAX697EPE+ is ideally suited for battery-powered applications such as cell phones, PDAs and wireless applications. It is optimized for battery-operated systems with up to 5 V operation. Its choice of 1.8 V and 2.5 V digital logic interfaces makes it suitable for single-supply, low-cost and low-power systems. It is a low-power, highly efficient Supervisor IC that operates off a single supply and is fully specified over the -40°C to +85°C temperature range. It is also compatible with a wide range of supply voltages from 1.7 V to 5.5 V. The MAX697EPE+ provides a highly efficient voltage supervisor for a wide range of battery-powered applications. It features ultra-low operating supply current (3 μA typical) and ultra-low quiescent current (25 nA typical). It also features two independent active-low reset outputs that can be used as Power-on reset (POR) or Single-Wire Reset (SWR). The reset outputs can be selectively enabled or disabled at any time depending on user requirements. It also provides independent power-on reset, power down reset and thermal reset functions. Furthermore, it has an integrated watchdog timer, which allows the system to reset the system after a predetermined time-out period.

Working Principle

The working principle of the MAX697EPE+ is based on a voltage monitoring circuit and a power-up and power-down time delay circuits. The voltage monitoring circuit monitors the supply voltage level and generates a reset signal when the voltage dips below the reset threshold voltage. The supply voltage is monitored by the chip\'s two comparators, which compare the supply voltage against two programmable thresholds (1.6 V and 2.4 V). When the monitored voltage drops below the reset threshold voltage, the reset signal is generated.The power-up and power-down time delay circuits are used to prevent the reset signal from being activated during system power-up and power-down. The power-up time delay circuit is responsible for delaying the reset signal generation while the chip is powering up to the normal operational voltage level. The power-down time delay circuit ensures that the reset signal is generated only when the operating voltage level drops below the reset threshold voltage. The integrated watchdog timer is used to monitor the system for abnormal conditions for a predetermined time. When the watchdog timer detects an abnormal condition, it issues a reset signal and boots the system up again.

Conclusion

The MAX697EPE+ is an efficient and low-power Supervisor IC designed for battery-powered applications. It features a wide input voltage range, small footprint, faster power-up/power-down times and higher thermal performance. Its independently programmable reset outputs, integrated watchdog timer and power-up and power-down time delay circuits make it ideal for low-power/battery-powered applications.

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