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ADM12914-2ARQZ-RL7 Arkusz danych(PDF) 1 Page - Analog Devices |
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ADM12914-2ARQZ-RL7 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 16 page ±0.8% Accurate Quad UV/OV Positive/Negative Voltage Supervisor ADM12914 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalog Devices foritsuse,nor for anyinfringements ofpatents orother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved. FEATURES Quad undervoltage/overvoltage (UV/OV) positive/negative supervisor Supervises up to two negative rails Adjustable UV and OV input thresholds Industry leading threshold accuracy over the extended temperature range: ±0.8% 1 V buffered reference output Open-drain UV and OV reset outputs Adjustable reset timeout with disable option Outputs guaranteed down to VCC of 1 V Glitch immunity 62 μA supply current 16-lead QSOP package Specified from −40°C to +125°C APPLICATIONS Server supply monitoring FPGA/DSP core and I/O voltage monitoring Telecommunications equipment Medical equipment FUNCTIONAL BLOCK DIAGRAM TIMER TIMER VCC LOGIC OUTPUT LOGIC REF 500mV 500mV 500mV 500mV MUX SEL GND ADM12914 VH1 UV OV REF LATCH/DIS VL1 VH2 VL2 VH3 VL3 VH4 VL4 Figure 1. GENERAL DESCRIPTION The ADM12914 is a quad voltage supervisory IC ideally suited for monitoring multiple rails in a wide range of applications. Each monitored rail has two dedicated input pins, VHx and VLx, which allows each rail to be monitored for both undervoltage (UV) and overvoltage (OV) conditions with high threshold accuracy of ±0.8%. Common active low undervoltage (UV) and overvoltage (OV) pins are shared by each of the monitored voltage rails. The ADM12914 includes a 1 V buffered reference output, REF, that acts as an offset when monitoring a negative voltage. The three-state SEL pin determines the polarity of the third and fourth inputs, that is, it configures the device to monitor positive or negative supplies. 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 the VCC pin to limit the current flow into the VCC pin at a level no greater than 10 mA. The ADM12914 uses the internal shunt regulator to regulate VCC if the supply line exceeds the absolute maximum ratings. The ADM12914 is available in two models. The ADM12914-1 offers a latching overvoltage output that can be cleared by toggling the LATCH input pin. The ADM12914-2 has a disable pin that can override and disable both the UV and the OV output signals. The ADM12914 is available in a 16-lead QSOP package. The device is specified over the extended temperature range of −40°C to +125°C. |
Podobny numer części - ADM12914-2ARQZ-RL7 |
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Podobny opis - ADM12914-2ARQZ-RL7 |
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