Quad UV/OV Voltage Monitor FeaTures DescripTion

1 LTC 291412914fcFor more information UV/OV Positive/Negative Voltage Monitor n Desktop and Notebook Computers n Network Servers n Core, I/O Voltage Monitors n Monitors Four Voltages Simultaneously n Adjustable UV and OV Trip Values n Guaranteed Threshold Accuracy: of Monitored Voltage over Temperature n Input Glitch Rejection n Monitors up to Tw o Negative Voltages n Buffered 1V Reference Output n Adjustable Reset Timeout with Timeout Disable n 62 A Quiescent Current n Open-Drain OV and UV Outputs n Guaranteed OV and UV for VCC 1V n Available in 16-Lead SSOP and 16-Lead (5mm 3mm) DFN Packages Quad UV/OV Supply Monitor ,10% Tolerance, 5V, , , The LT C 2914 is a quad input Voltage Monitor intended for monitoring multiple voltages in a variety of applications. Dual inputs for each monitored Voltage allow Monitor - ing four separate undervoltage (UV) conditions and four separate overvoltage (OV) conditions.

2 All monitors share a common undervoltage output and a common overvolt- age output. The LTC2914-1 has latching capability for the overvoltage output. The LTC2914-2 has functionality to disable both the overvoltage and undervoltage outputs. Polarity selection and a buffered reference allow Monitor - ing up to two separate negative voltages. A three-state input pin allows setting the polarity of two inputs without requiring any external components. Glitch filtering ensures reliable reset operation without false or noisy triggering. The LTC2914 provides a precise, versatile, space-con- scious, micropower solution for Voltage monitoring. Input Threshold Voltage vs Temperature Typical applicaTion FeaTures applicaTions DescripTion VH1 VCC LTC2914-1 SYSTEM 2914 TA01a F GNDTMR VL1 VL2 VH2 REF VL3 VH3 OV UV LATCH SEL VL4 CTMR 22nF TIMEOUT = 200ms VH4 5V P0 WER SUPPLIES TEMPERATURE ( C) 50 THRESHOLD Voltage , VOUT (V) 2502550 2914 TA01b 75 100 L, LT, LT C, LT M, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation.

3 All other trademarks are the property of their respective owners. LTC 291422914fcFor more information Voltages VCC (Note 3) .. to 6V OV, UV .. to 16V TMR .. to (VCC + ) VLn, VHn, LATCH, DIS, SEL .. to 7. 5 VTerminal Currents IVCC ..10mA Reference Load Current (IREF) .. 1mA IUV, IOV ..10mA(Notes 1, 2)Operating Temper atur e Range LTC2914C ..0 C to 70 C LTC2914I .. 40 C to 85 C LTC2914H .. 40 C to 125 CStorage Temper atur e Range .. 65 C to 150 CLead Temper atur e (Soldering, 10 sec) SSOP ..300 CabsoluTe MaxiMuM raTingspin conFiguraTionLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELTC2914 CDHC-1#PBFLTC2914 CDHC-1#TRPBF2914116-Lead Plastic (5mm 3mm) DFN0 C to 70 CLTC2914 IDHC-1#PBFLTC2914 IDHC-1#TRPBF2914116-Lead Plastic (5mm 3mm) DFN 40 C to 85 CLTC2914 HDHC-1#PBFLTC2914 HDHC-1#TRPBF2914116-Lead Plastic (5mm 3mm) DFN 40 C to 125 CLTC2914 CDHC-2#PBFLTC2914 CDHC-2#TRPBF2914216-Lead Plastic (5mm 3mm) DFN0 C to 70 CLTC2914 IDHC-2#PBFLTC2914 IDHC-2#TRPBF2914216-Lead Plastic (5mm 3mm) DFN 40 C to 85 CLTC2914 HDHC-2#PBFLTC2914 HDHC-2#TRPBF2914216-Lead Plastic (5mm 3mm)

4 DFN 40 C to 125 CLTC2914 CGN-1#PBFLTC2914 CGN-1#TRPBF2914116-Lead Plastic SSOP0 C to 70 CLTC2914 IGN-1#PBFLTC2914 IGN-1#TRPBF2914I116-Lead Plastic SSOP 40 C to 85 CLTC2914 HGN-1#PBFLTC2914 HGN-1#TRPBF2914H116-Lead Plastic SSOP 40 C to 125 C1615141312111091712345678 VCCTMRSELLATCH/DISUVOVREFGNDVH1VL1VH2VL2 VH3VL3VH4VL4 TOP VIEWDHC PACKAGE16-LEAD (5mm 3mm) PLASTIC DFNTJMAX = 150 C, JA = C/WEXPOSED PAD (PIN 17) PCB GND CONNECTION OPTIONALGN PACKAGE16-LEAD PLASTIC SSOP12345678 TOP VIEW161514131211109VH1VL1VH2VL2VH3VL3VH4 VL4 VCCTMRSELLATCH/DISUVOVREFGNDTJMAX = 150 C, JA = 110 C/WorDer inForMaTionLTC 291432914fcFor more information inForMaTionLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELTC2914 CGN-2#PBFLTC2914 CGN-2#TRPBF2914216-Lead Plastic SSOP0 C to 70 CLTC2914 IGN-2#PBFLTC2914 IGN-2#TRPBF2914I216-Lead Plastic SSOP 40 C to 85 CLTC2914 HGN-2#PBFLTC2914 HGN-2#TRPBF2914H216-Lead Plastic SSOP 40 C to 125 CConsult LT C Marketing for parts specified with wider operating temperature ranges.

5 *The temperature grade is identified by a label on the shipping container Consult LT C Marketing for information on non-standard lead based finish more information on lead free part marking, go to: For more information on tape and reel specifications, go to: The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. VCC = , VLn = , VHn = , LATCH = VCC, SEL = VCC, DIS = Open unless otherwise noted. (Note 2)SYMBOLPARAMETERCONDITIONSMINTYPMAXUNIT SVSHUNTVCC Shunt Regulator VoltageICC = 40 C < TA < 125 VSHUNTVCC Shunt Regulator Load RegulationICC = 2mA to 10mAl200300mVVCCS upply Voltage (Note 3) (MIN)Minimum VCC Output ValidDIS = 0Vl1 VVCC(UVLO)Supply Undervoltage LockoutVCC Rising, DIS = VCC(UVHYST)Supply Undervoltage Lockout HysteresisDIS = 0Vl52550mVICCS upply CurrentVCC = to 6Vl62100 AVREFR eference Output VoltageIVREF = 40 C < TA < 125 Voltage Thresholdl492500508mVtUODU ndervoltage/Overvoltage Voltage Threshold to Output DelayVHn = VUOT 5mV or VLn = VUOT + 5mVl50125500 sIVHLVHn, VLn Input Currentl 15nA 40 C < TA < 125 Cl 30nAtUOTOUV/OV Time-Out PeriodCTMR = 40 C < TA < 125 (IH)OV Latch Clear Input (IL)OV Latch Clear Threshold Input Input CurrentVLATCH > 1 AVDIS(IH)

6 DIS Input (IL)DIS Input Input CurrentVDIS > AITMR(UP)TMR Pull-Up CurrentVTMR = 0Vl A 40 C < TA < 125 Cl AITMR(DOWN)TMR Pull-Down CurrentVTMR = A 40 C < TA < 125 AelecTrical characTerisTicsLTC 291442914fcFor more information 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: All currents into pins are positive; all voltages are referenced to GND unless otherwise 3: VCC maximum pin Voltage is limited by input current. Since the VCC pin has an internal shunt regulator, a low impedance supply that exceeds 6V may exceed the rated terminal current. Operation from higher Voltage supplies requires a series dropping resistor.

7 See Applications 4: Guaranteed by design, not subject to (DIS)Timer Disable VoltageReferenced to VCCl 180 270mVVOHO utput Voltage High UV/OVVCC = , IUV/OV = 1 Al1 VVOLO utput Voltage Low UV/OVVCC = , IUV/OV = VCC = 1V, IUV = 100 Al VThree-State Input SELVILLow Level Input Level Input Voltage when Left in Hi-Z StateISEL = 10 40 C < TA < 125 SEL High, Low Input Currentl 25 AISEL(MAX)Maximum SEL Input CurrentSEL Tied to Either VCC or GNDl 30 AtPWLatch Clear Pulse Width(Note 4)l2 s The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. VCC = , VLn = , VHn = , LATCH = VCC, SEL = VCC, DIS = Open unless otherwise noted. (Note 2)elecTrical characTerisTicsLTC 291452914fcFor more information Threshold Voltage vs TemperatureSupply Current vs TemperatureVCC Shunt Voltage vs TemperatureVHn Monitor TimingVLn Monitor TimingVHn Monitor Timing (TMR Pin Strapped to VCC)VLn Monitor Timing (TMR Pin Strapped to VCC)NOTE.

8 WHEN AN INPUT IS CONFIGURED AS A NEGATIVE SUPPLY Monitor , VHn WILL TRIGGER AN OV CONDITION AND VLn WILL TRIGGER A UV CONDITIONS pecifications are at TA = 25 C, VCC = unless otherwise DiagraMsTypical perForMance characTerisTicsVHnUVVUOT1 VtUODtUOTO2914 TD01 VLnOVVUOT1 VtUODtUOTO2914 TD02 VHnUVVUOT1 VtUODtUOD2914 TD03 VLnOVVUOT1 VtUODtUOD2914 TD04 TEMPERATURE ( C) Voltage , VOUT (V) 25025502914 ( C) 505075 252540 ICC ( A)5055456002914 G02100757065 VCC = 5 VVCC = = ( C) (V) 25025502914 A1mA2mA5mA10mALTC 291462914fcFor more information Shunt Voltage vs ICCB uffered Reference Voltage vs TemperatureTransient Duration vs Comparator OverdriveUV Output Voltage vs VCCUV/OV Voltage Output Low vs Output Sink CurrentReset Timeout Period vs CapacitanceUV, ISINK vs VCCR eset Timeout Period vs TemperatureUV Output Voltage vs VCCS pecifications are at TA = 25 C, VCC = unless otherwise perForMance characTerisTicsICC (mA) (V) C 40 C85 CTEMPERATURE ( C) Voltage , VREF (V) 25025502914 OVERDRIVE PAST THRESHOLD (%) TRANSIENT DURATION ( s)5006007001101002914 G063002001000 VCC = 6 VRESET OCCURSABOVE CURVEVCC = ( C) 506UV/OV TIMEOUT PERIOD, tUOTO (ms)7891012 25025502914 G077510011 CTMR = 1nFSUPPLY Voltage , VCC (V)0UV Voltage (V)

9 WITH10k PULL-UPUV WITHOUT10k PULL-UPSUPPLY Voltage , VCC (V)0UV Voltage (V)34542914 G092101235 VHn = = VCCSUPPLY Voltage , VCC (V)0 PULL-DOWN CURRENT, IUV (mA)34542914 G102101235 VHn = = VCCUV AT 150mVUV AT 50mVIUV/OV (mA)00UV/OV, VOL (V) G11253085 C 40 C25 CTMR PIN CAPACITANCE, CTMR (nF)10UV/OV TIMEOUT PERIOD, tUOTO (ms) G1211 LTC 291472914fcFor more information (Pin 13, LTC2914-2): Output Disable Input. Disables the OV and UV output pins. When DIS is pulled high, the OV and UV pins are not asserted except during a UVLO condition. Pin has a weak (2 A) internal pull-down to GND. Leave pin open if Pad (Pin 17, DFN Package): Exposed Pad may be left open or connected to device ground. GND (Pin 9): Device GroundLATCH (Pin 13, LTC2914-1): OV Latch Clear/Bypass Input. When pulled low, OV is latched when asserted.

10 When pulled high, OV latch is cleared. While held high, OV has the same delay and output characteristics as (Pin 11): Overvoltage Logic Output. Asserts low when any positive polarity input Voltage is above threshold or any negative polarity input Voltage is below threshold. Latched low (LTC2914-1). Held low for an adjustable delay time after all inputs are valid (LTC2914-2). Pin has a weak pull-up to VCC and may be pulled above VCC using an external pull-up. Leave pin open if unused. REF (Pin 10): Buffered Reference Output. 1V reference used for the offset of negative-monitoring applications. The buffered reference sources and sinks up to 1mA. The reference drives capacitive loads up to 1nF. Larger capaci-tive loads may cause instability. Leave pin open if (Pin 14): Input Polarity Select Three-State Input.