Renesas Electronics Corporation

The ISL88011, ISL88012, ISL88013, ISL88014, ISL88015 family of devices offer both fixed and/or adjustable voltage-monitoring that combine popular functions such as Power-On reset control, watchdog timer, supply voltage supervision, and manual reset assertion in a small 5 Ld SOT-23 package. Unique features on the ISL88013 and ISL88015 include a watchdog timer with a 51s start-up timeout and a 1. 6s normal timeout duration. On the ISL88011 and ISL88014, users can increase the nominal 200ms Power-On reset timeout delay by adding an external capacitor to the CPORpin. Both fixed and adjustable voltage monitors are provided by the ISL88012. Complementary active-low and active-high reset outputs are available on the ISL88011, ISL88012 and ISL88013 devices. All devices provide manual reset capability (see "Product Features Table" on page 5). Seven preprogrammed reset threshold voltages accurate to ±1. 5% over temperature are offered (see "Ordering Information" on page 3). The ISL88012, ISL88014 and ISL88015 have a user-adjustable voltage input available for custom monitoring of any voltage down to 0. 6V. All parts are specifically designed for low power consumption and high threshold accuracy.

The ISL88016, ISL88017 supervisors offer pin-selectable voltage trip points along with popular functions such as Power-on Reset control, Supply Voltage Supervision, and Manual Reset assertion in a small 6 Ld TSOT-23 package. By connecting the three VSET pins to VDD, GND or floating, users can program the voltage trip point from 1. 60V to 2. 85V in 50mV increments on the ISL88016 and from 2. 15V to 4. 65V in 100mV increments on the ISL88017. These user-selectable reset threshold voltages are accurate to ±2% over temperature and the reset signal is valid down to 1V. Intersil's proprietary TwinPin™ combines the active low reset out with the manual reset input into one pin. This provides device adjustability without sacrificing functionality. These parts are specifically designed for low power consumption and high threshold accuracy.

The ISL88016, ISL88017 supervisors offer pin-selectable voltage trip points along with popular functions such as Power-on Reset control, Supply Voltage Supervision, and Manual Reset assertion in a small 6 Ld TSOT-23 package. By connecting the three VSET pins to VDD, GND or floating, users can program the voltage trip point from 1. 60V to 2. 85V in 50mV increments on the ISL88016 and from 2. 15V to 4. 65V in 100mV increments on the ISL88017. These user-selectable reset threshold voltages are accurate to ±2% over temperature and the reset signal is valid down to 1V. Intersil's proprietary TwinPin™ combines the active low reset out with the manual reset input into one pin. This provides device adjustability without sacrificing functionality. These parts are specifically designed for low power consumption and high threshold accuracy.

The ISL88021 and ISL88022 family of devices are customizable triple voltage-monitoring supervisors that assert a reset if any of the monitored voltages becomes non-compliant. They offer popular functions such as Power-On-Reset timing control with both RESET and RESET outputs, Supply Voltage Supervision, both under or overvoltage detection, and Manual Reset assertion. By offering these features in a small 8 Ld MSOP package, the ISL88021 and ISL88022 can lower system cost, reduce board space requirements and increase the reliability of systems. Applying a voltage to VDDactivates the Power-On-Reset circuit which holds RESET low for an adjustable period of time. This allows the power supply and system oscillator to stabilize before the processor can execute code. Low VDDdetection circuitry protects the user's system from low voltage conditions, resetting the system when VDDfalls below its minimum preset voltage threshold VTH1. Reset remains asserted until VDDreturns to its proper operating level and stabilizes. Two additional voltage monitoring inputs, V2MON (preset) and V3MON (adjustable), monitor other supplies to provide reliable system operation. The ISL88021 V3MON input monitors for undervoltage (UV) conditions whereas the ISL88022 V3MON input allows monitoring for overvoltage (OV) conditions. The monitored voltage on V3MON on either device is compared via a resistor divider to a 600mV internal reference. Hence, any voltage more or less positive than this reference can be accurately monitored to meet specific system level requirements or to fine-tune the threshold for applications requiring higher precision. These devices also let users increase the Power-On-Reset time-out delay by connecting a capacitor between CPOR and ground. This lengthens the period of an internal clock counter thereby increasing the time between voltage compliance and reset outputs signaling. A manual reset input provides debounce circuitry for minimum reset component count.

The ISL88021 and ISL88022 family of devices are customizable triple voltage-monitoring supervisors that assert a reset if any of the monitored voltages becomes non-compliant. They offer popular functions such as Power-On-Reset timing control with both RESET and RESET outputs, Supply Voltage Supervision, both under or overvoltage detection, and Manual Reset assertion. By offering these features in a small 8 Ld MSOP package, the ISL88021 and ISL88022 can lower system cost, reduce board space requirements and increase the reliability of systems. Applying a voltage to VDDactivates the Power-On-Reset circuit which holds RESET low for an adjustable period of time. This allows the power supply and system oscillator to stabilize before the processor can execute code. Low VDDdetection circuitry protects the user's system from low voltage conditions, resetting the system when VDDfalls below its minimum preset voltage threshold VTH1. Reset remains asserted until VDDreturns to its proper operating level and stabilizes. Two additional voltage monitoring inputs, V2MON (preset) and V3MON (adjustable), monitor other supplies to provide reliable system operation. The ISL88021 V3MON input monitors for undervoltage (UV) conditions whereas the ISL88022 V3MON input allows monitoring for overvoltage (OV) conditions. The monitored voltage on V3MON on either device is compared via a resistor divider to a 600mV internal reference. Hence, any voltage more or less positive than this reference can be accurately monitored to meet specific system level requirements or to fine-tune the threshold for applications requiring higher precision. These devices also let users increase the Power-On-Reset time-out delay by connecting a capacitor between CPOR and ground. This lengthens the period of an internal clock counter thereby increasing the time between voltage compliance and reset outputs signaling. A manual reset input provides debounce circuitry for minimum reset component count.

The ISL88031 is a quintuple voltage-monitoring supervisor combining competitive reset threshold accuracy and low power consumption. This device combines popular functions such as Power-On Reset, Undervoltage Supply Supervision, reset signaling and Manual Reset. Monitoring up to five different voltages in a small 8 Ld MSOP package, the ISL88031 devices can help to lower system cost, reduce board space requirements, and increase the reliability of multi-voltage systems. Low VDDdetection circuitry protects the user's system from low voltage conditions, resetting the system when VDDor any of the other monitored power supply voltages fall below their respective minimum voltage thresholds. The reset signal remains asserted until all of these voltages return to proper operating levels and stabilize. With two of the five voltage monitors being preset for common supplies, users can adjust the threshold voltages of the third, fourth, and fifth voltage monitors in order to meet specific system level requirements.