Quintuple Voltage Monitor

® ISL88031 Data Sheet March 31, 2006 FN8227.0 Quintuple Voltage Monitor 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 VDD detection circuitry protects the user’s system from low voltage conditions, resetting the system when VDD or 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. Features • Quintuple Voltage Monitoring • Fixed-Voltage Options Allow Precise Monitoring of +5.0V, +3.3V, +3.0V, +2.5V and +1.8V Power Supplies • Adjustable Voltage Inputs Monitor Voltages > 0.6V • 120ms Nominal Reset Pulse Width • Manual Reset Capability • Reset Signals Valid Down to VDD = 1V • Accurate ±1.8% Voltage Threshold • Immune to Power-Supply Transients • Low 19µA Maximum Supply Current at 5V • Pb-Free Plus Anneal Available (RoHS Compliant) Applications • Telecom & Datacom Systems • Routers & Servers • Access Concentrators www.DataSheet4U.com • Cable/Satellite Applications • Desktop & Notebook Computer Systems • Data Storage Equipment • Set-Top Boxes • Industrial Equipment • Multi-Voltage Systems Pinout ISL88031 (8 LD MSOP) TOP VIEW 8 7 6 5 MR VDD V2MON GND 1 2 3 4 RST V5MON V4MON V3MON 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners. ISL88031 Ordering Information PART NUMBER (Note 1, 2) ISL88031IU8HFZ ISL88031IU8HEZ ISL88031IU8HCZ ISL88031IU8HAZ ISL88031IU8ECZ ISL88031IU8EAZ NOTES: 1. Add “-TK” suffix for Tape and Reel. 2. Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. PART MARKING AMA ANZ APR APS APT APZ VTH1 4.64V 4.64V 4.64V 4.64V 2.90V 2.90V VTH2 3.09V 2.92V 2.32V 1.69V 2.32V 1.69V TEMP RANGE (°C) -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 PACKAGE (Pb-free) 8 Ld MSOP 8 Ld MSOP 8 Ld MSOP 8 Ld MSOP 8 Ld MSOP 8 Ld MSOP PKG. DWG. # M8.118 M8.118 M8.118 M8.118 M8.118 M8.118 Pin Descriptions ISL88031 1 2 3 4 5 6 7 8 NAME MR VDD V2MON GND V3MON V4MON V5MON RST FUNCTION Active-Low Open Drain Manual Reset Input with internal pull-up resistor Chip Bias Input and integrated preset under voltage monitor Second Preset Under-Voltage Monitor Input Ground Adjustable Third Under-Voltage Monitor Input Adjustable Fourth Under-Voltage Monitor Input Adjustable Fifth Under-Voltage Monitor Input Active-Low Open Drain Reset Output Functional Block Diagram VDD MR ± VREF V2MON POR PB RST ± VREF V3MON VREF ± V5MON V4MON ± VREF GND VREF ± 2 FN8227.0 March 31, 2006 ISL88031 Absolute Maximum Ratings Temperature under bias . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C Voltage on any pin with respect to GND . . . . . . . . . . . . -1.0V to +7V D.C. output current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA Thermal Information Thermal Resistance (Typical, Note 3) MSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . θJA (°C/W) 145 Recommended Operating Conditions Operating temperature range (Industrial). . . . . . . . . .-40°C to +85°C Storage temperature range . . . . . . . . . . . . . . . . . . .-65°C to +150°C Lead temperature (soldering, 10s). . . . . . . . . . . . . . . . . . . . . . 300°C CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTE: 3. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. Electrical Specifications SYMBOL VDD IDD1 IDD2 IDDA Over the recommended operating conditions unless otherwise specified. TEST CONDITIONS MIN 2.0 VDD = 5.0V V2MON = 3.3V V3, V4, V5MON = 1.0V 14 5.5 19 TYP MAX 5.5 19 7 100 UNITS V µA µA nA PARAMETER Supply Voltage Range VDD Supply Current V2MON Input Current V3, V4, V5MON Input Current VOLTAGE THRESHOLDS VTH1 Fixed Voltage Trip Point for VDD ISL88031IU8HxZ ISL88031IU8ExZ VTH1HYST Hysteresis of VTH1 VTH1 = 4.64V VTH1 = 2.90V VTH2 Fixed Voltage Trip Point for V2MON ISL88031IU8xFZ ISL88031IU8xEZ ISL88031IU8xCZ ISL88031IU8xAZ 3.022 2.901 2.291 1.652 4.551 2.814 4.634 2.866 46 29 3.078 2.955 2.333 1.683 3.133 3.008 2.375 1.713 4.717 2.917 V V mV mV V V V V VTH2HYST Hysteresis of VTH2 VTH2 = 3.09V VTH2 = 2.92V VTH2 = 2.32V VTH2 = 1.69V 37 29 23 17 mV mV mV mV VREF V3MON Adj. Reset Threshold Voltage VTH for V3MON 0.589 0.585 0.600 0.598 3 0.611 0.611 V V mV V4MON, V5MON Adj. Reset Threshold Voltage VTH for V4MON, V5MON VREFHYST RESET VOL Reset Output Voltage Low VDD ≥ 3.3V, Sinking 2.5mA VDD < 3.3V, Sinking 1.5mA tRPD tPOR CLOAD VTH to Reset Asserted Delay POR Timeout Delay Load Capacitance on Reset Pins Hysteresis Voltage 0.05 0.05 6 80 120 5 0.40 0.40 V V µs 180 ms pF 3 FN8227.0 March 31, 2006 ISL88031 Electrical Specifications SYMBOL MANUAL RESET VMRL VMRH tMR RPU MR Input Voltage Low MR Input Voltage High MR Minimum Pulse Width Internal Pull-Up Resistor VDD-0.6 550 10 0.8 V V ns kΩ Over the recommended operating conditions unless otherwise specified. (Continued) TEST CONDITIONS MIN TYP MAX UNITS PARAMETER Pin Description RST The RST output is an open drain output which is asserted low whenever 1. the device is initially powered up to 1V or 2. VDD, V2MON, V3MON, V4MON, or V5MON fall below their minimum voltage sense level. V4MON VDD V2MON V3MON ISL88031 MR PB reset signal RST MR The MR input is an active low debounced input to which a user can connect a push-button to add manual reset capability or use a signal to pull low. MR has an internal pullup resistor. V5MON GND VDD The VDD pin is the IC power supply terminal. The voltage at this pin is compared against an internal factory-programmed voltage trip point, VTH1. RST is first asserted low when the device is initially powered and VDD < 1 V and then at any time thereafter when VDD falls below VTH1. The device is designed with hysteresis to help prevent chattering due to noise and is immune to brief power-supply transients. FIGURE 1. TYPICAL APPLICATION DIAGRAM Principles of Operation The ISL88031 device provide those functions needed for monitoring critical voltages such as power-supply and battery functions in microprocessor systems. It provides such features as Power On Reset control, Supply Voltage Supervision, and Manual Reset Assertion. The integration of all these features along with competitive reset threshold accuracy and low power consumption make the ISL88031 device suitable for a wide variety of applications needing multi-voltage monitoring. See Figure 1 for typical application diagram. V2MON The V2MON input is the second preset monitored voltage that causes the RST output to go low when the voltage on V2MON falls below VTH2. V3MON, V4MON, and V5MON The VxMON inputs provide monitoring and UV compliance of three additional voltages through resistor dividers. A reset is issued on the ISL88031 if the voltage on any VxMON falls below the internal VREF of 0.6V. Low Voltage Monitoring During normal operation, the ISL88031 monitors the voltage levels of VDD, V2MON, V3MON, V4MON, and V5MON. If the voltage on any of these five inputs falls below their respective voltage trip points, a reset is asserted (RST = low) to prevent the microprocessor from operating during a power failure or brownout condition. This reset signal remains low until the voltages exceeds the voltage threshold settings for the reset time delay period tPOR. The ISL88031 allows users to customize the minimum voltage sense level for three of the five monitored voltages. For example, the user can adjust the voltage input trip point (VTRIP) for V3MON, V4MON and V5MON inputs. To do this, connect an external resistor divider network to the VxMON pin in order to set the trip point to some other voltage above 600mV according to the following formula: VTRIP = 0.6V X (R1 + R2) / R2 4 FN8227.0 March 31, 2006 ISL88031 Power On Reset (POR) Applying power to the ISL88031 activates a POR circuit which makes the reset pin(s) active (i.e. RST goes high while RST goes low). These signals provide several benefits: • It prevents the system microprocessor from starting to operate with insufficient voltage. • It prevents the processor from operating prior to stabilization of the oscillator. • It ensures that the monitored device is held out of operation until internal registers are properly loaded. • It allows time for an FPGA to download its configuration prior to initialization of the circuit. The reset signal remains active unt