Quad UV/OV Positive/Negative Voltage Supervisor Data Sheet ADM2914 FEATURES FUNCTIONAL BLOCK DIAGRAM V CC TIMER Quad UV/OV positive/negative supervisor ADM2914 Supervises up to 2 negative rails VH1 Adjustable UV and OV input thresholds TIMER High threshold accuracy over temperature: 1.5% 500mV 1 V buffered reference output Open-drain UV and OV reset outputs VL1 Adjustable reset timeout with disable option VH2 Outputs guaranteed down to V of 1 V UV CC 500mV Glitch immunity 62 A supply current VL2 OUTPUT 16-lead QSOP package LOGIC VH3 APPLICATIONS 500mV Server supply monitoring OV FPGA/DSP core and I/O voltage monitoring VL3 MUX Telecommunications equipment VH4 Medical equipment LOGIC LATCH/DIS 500mV REF REF VL4 SEL GND Figure 1. GENERAL DESCRIPTION the V pin to limit the current flow into the V pin to no The ADM2914 is a quad voltage supervisory IC ideally suited CC CC greater than 10 mA. The ADM2914 uses the internal shunt for monitoring multiple rails in a wide range of applications. regulator to regulate V if the supply line exceeds the absolute CC Each monitored rail has two dedicated input pins, VHx and VLx, maximum ratings. which allow each rail to be monitored for both overvoltage (OV) The ADM2914 is available in two models. The ADM2914-1 and undervoltage (UV) conditions. A common active low offers a latching overvoltage output that can be cleared by undervoltage (UV) and overvoltage (OV) pin is shared by each toggling the LATCH input pin. The ADM2914-2 has a disable of the monitored voltage rails. OV UV pin that can override and disable both the and output The ADM2914 includes a 1 V buffered reference output, REF, signals. that acts as an offset when monitoring a negative voltage. The three-state SEL pin determines the polarity of the third and The ADM2914 is available in a 16-lead QSOP package. The fourth inputs, that is, it configures the device to monitor device operates over the extended temperature range of 40C positive or negative supplies. to +125C. The device incorporates an internal shunt regulator that enables the device to be used in higher voltage systems. This feature requires a resistor to be placed between the main supply rail and Rev. F Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20092017 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 08170-001ADM2914 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Threshold Accuracy ................................................................... 10 Applications ....................................................................................... 1 Voltage Monitoring Example .................................................... 10 Functional Block Diagram .............................................................. 1 Power-Up and Power-Down ..................................................... 11 General Description ......................................................................... 1 UV/OV Timing Characteristics ............................................... 11 Revision History ............................................................................... 2 Timer Capacitor Selection ........................................................ 11 Specif icat ions ..................................................................................... 3 UV OV / Output Characteristics ............................................... 12 Absolute Maximum Ratings ............................................................ 4 Glitch Immunity ......................................................................... 12 ESD Caution .................................................................................. 4 Undervoltage Lockout (UVLO) ............................................... 12 Pin Configurations and Function Descriptions ........................... 5 Shunt Regulator .......................................................................... 12 Typical Performance Characteristics ............................................. 6 OV Latch (ADM2914-1) ........................................................... 13 Theory of Operation ........................................................................ 8 Disable (ADM2914-2) ............................................................... 13 Voltage Supervision ...................................................................... 8 Typical Applications ....................................................................... 14 Polarity Configuration ................................................................. 8 Outline Dimensions ....................................................................... 16 Monitoring Pin Connections ...................................................... 9 Ordering Guide .......................................................................... 16 REVISION HISTORY 3/2017Rev. E to Rev. F 7/2013Rev. B to Rev. C Changes to Figure 25 ...................................................................... 14 Changes to Figure 17 and Figure 18................................................ 9 Deleted UV and OV Rise and Fall Times Section ..................... 12 5/2015Rev. D to Rev. E Changes to Figure 24 and Figure 25............................................. 14 OV Changes to Latch (ADM2914-1) Section ............................. 14 Added Figure 23, Renumbered Sequentially .............................. 14 2/2010Rev. A to Rev. B Added Table 6, Renumbered Sequentially .................................. 14 Changes to Figure 17 and Figure 18................................................ 9 12/2014Rev. C to Rev. D 12/2009Rev. 0 to Rev. A Changes to Figure 24 ...................................................................... 14 Changes to Shunt Regulator Section ............................................ 12 Changes to Figure 25 ...................................................................... 15 5/2009Revision 0: Initial Version Rev. F Page 2 of 16