TC54 Data Sheet - Microchip Technology

1 2001-2014 Microchip Technology 1TC54 Features: Detection Thresholds Small Packages: 3-Pin SOT-23A, SOT-89, and TO-92 Low Current Drain: 1 A, typical Wide Detection Range: to Wide Operating Voltage Range: to 10 VApplications: Battery Voltage Monitoring Microprocessor Reset System Brown-Out Protection Switching Circuit in Battery Backup Level DiscriminatorFunctional Block DiagramGeneral Description:The tc54 series are CMOS voltage detectors espe-cially well-suited for battery-powered applicationsbecause of their extremely low 1 A operating currentand small surface-mount packaging. Each part is laser-trimmed to the desired threshold voltage, which can bespecified from to with a 2% tc54 is available with either an open-drain or com-plementary output stage.

2 During operation, the output(VOUT) remains in the logic-high state as long as VIN isgreater than the specified threshold voltage (VDET ).When VIN falls below VDET , the output is driven to alogic-low. VOUT remains low until VIN rises aboveVDET by an amount VHYST, when it resets to a logic-high TypesDevice FeaturesVOUTVSS+ VINVREFTC54VC onlyTC54VN has open-drain has complementary (push-pull) SOT-89 Note:3-Pin SOT-23A is equivalent to theEIAJ TO-92123 VSSVINVOUTVINVOUTVSS312TC543-Pin SOT-23 AVIND eviceOutput Reset DelayStd. Trip Points(1) (typical)TypeStateTC54 VNOpen-DrainActive , , , , , 1:Custom Trip Points available. Minimum order requirement. Information available upon DetectorTC54DS20001434K-page 2 2001-2014 Microchip Technology CHARACTERISTICSA bsolute Maximum Ratings Input Voltage.

3 +12 VOutput Current ..50 mAOutput Voltage: (VSS ) to (VIN + ) (VSS ) to 12 VPower Dissipation (TA 70 C):3-Pin SOT-23A ..240 mW3-Pin mW3-Pin TO-92 ..300 mWOperating Temperature C to +85 CStorage Temperature Range ..-65 C to +150 C Notice: Stresses above those listed under "Absolute Maxi-mum Ratings" may cause permanent damage to the are stress ratings only and functional operation of thedevice at these or any other conditions above those indicatedin the operation sections of the specifications is not to Absolute Maximum Rating conditions forextended periods may affect device CHARACTERISTICSE lectrical Specifications: Unless otherwise noted, TA = +25 ConditionsOperating (VDET ) (VDET ) < CurrentISS AVIN = = = = Voltage(Note 1)VDET +2% tc54 VXNM (Note 2)Hysteresis VoltageVHYST2870112mVVDET = (typical)42105168 VDET = (typical)54135216 VDET = (typical)58145232 VDET = (typical)60150240 VDET = (typical)84210336 VDET = (typical)86215344 VDET = (typical)Q-60%QQ+60%VDET = (20*Q)V (typical) (Note 2)Output mAVOL = , VIN = VOL = , VIN = VOL = , VIN = VOL = , VIN = Only:VOH = VIN , VIN = m p c o o f ( VDET )TC (VDET ) 100 ppm/ C -40 C TA 85 CDelay TimetDLY VOUT inversionNote 1.

4 For other voltage options, please contact your regional Microchip sales :Represents all other custom Threshold Voltage options. 2001-2014 Microchip Technology 3TC54 FIGURE 1-1:Timing SPECIFICATIONSE lectrical Characteristics: Unless otherwise indicated, all limits are specified for: VDD =+ to + , VSS= RangesOperating Temperature RangeTA-40 +85 CStorage Temperature RangeTA-65 +150 CThermal Package ResistancesThermal Resistance, 3L-SOT-23A JA 308 C/WThermal Resistance, 3L-SOT-89 JA C/WThermal Resistance, 3L-TO-92 JA 146 C/WVDDOUTPUT VOHtDLYVDET +VHYSTOUTPUT VDETTC54DS20001434K-page 4 2001-2014 Microchip Technology DESCRIPTIONSThe descriptions of the pins are listed in Ta b l e 2 - 2-1.

5 PIN FUNCTION Output (VOUT)VOUT goes low when VIN drops below VDET andreturns high when VIN rises above VDET + VHYST.(See Figure 3-1). Input (VIN)VIN can be used for power supply monitoring or avoltage level that requires Terminal (VSS)VSS provides the negative reference for the analoginput voltage. Typically, the circuit ground is 1 VOUTD igital Output32 2 VINA nalog Input23 3 VSSG round Terminal Tab VINA nalog Input 2001-2014 Microchip Technology DESCRIPTIONIn normal steady-state operation when VIN>VDET ,the output will be at a logic-high (see Figure 3-1). In thecase of the TC54VN, this is an open-drain condition. Ifthe input falls below VDET , the output will pull down(Logic 0) to VSS.

6 Generally, VOUT can pull down towithin of VSS at rated output current and inputvoltage. (See Section ElectricalCharacteristics ).The output (VOUT) will stay valid until the input voltagefalls below the minimum operating voltage (VINMIN) Below this minimum operating voltage, the outputis undefined. During power-up (or anytime VIN hasfallen below VINMIN), VOUT will remain undefined untilVIN rises above VINMIN. When this occurs, the outputwill become valid. VOUT will be in its Active-low state,while VINMIN<VIN<VDET+ (therefore, VDET+ = VDET + VHYST). If the input rises above VDET+, the output willassume its Inactive state (high for TC54VC, open-drainfor TC54VN).

7 FIGURE 3-1:Timing Voltage VDET Minimum Operating VoltageVHYSTVDET+Output VoltageRelease Voltage or Reset VoltageGround LevelGround LevelVOUTTC54DS20001434K-page 6 2001-2014 Microchip Technology the Trip Point, VDET Although the tc54 has a pre-programmed VDET , it issometimes necessary to make adjustments duringprototyping. This can be accomplished by connectingan external resistor divider to a tc54 , which has aVDET lower than that of VSOURCE (Figure 4-1).To maintain detector accuracy, the bleeder currentthrough the divider should be significantly higher thanthe 1 A operating current required by the tc54 . A rea-sonable value for this bleeder current is 100 A (100times the 1 A required by the tc54 ).

8 For example, ifVDET = 2V and the desired trip point is , the valueof R1 + R2 is 25 k ( A). The value ofR1+R2 can be rounded to the nearest standard valueand plugged into the equation of Figure 4-1 to calculatevalues for R1 and R2. 1% tolerance resistors 4-1:Modify Trip-point of the tc54 using External Resistor ApplicationsLow operating power and small physical size make theTC54 series ideal for many voltage detector applica-tions, such as those shown in Figures 4-2, 4-3 and 4-2 shows a low-voltage gate drive protectioncircuit that prevents the overheating of the logic-levelMOSFET due to insufficient gate voltage. When theinput signal is below the threshold of the TC54VN, itsoutput grounds the gate of the MOSFET.

9 Figure 4-3and Figure 4-4 show the tc54 in conventional voltagemonitoring 4-2:MOSFET Low Drive 4-3:Battery Voltage 4-4:Power Good :In this example, VSOURCE must begreater than (VDET )VSOURCER1R1R2+-------------------- VDET-=VINVOUTVSSR1 VSOURCER2 Where:VSOURCE= Voltage to be monitoredVDET = Threshold Voltage setting of TC54TC54 VINVOUTVSS270 + tc54 VXVINVOUTVSSP ower Good+ 2001-2014 Microchip Technology Marking Information3-Lead SOT-23A2 NNExampleC3023-Lead SOT-89 XXXYYWW@NNNE xampleE3313-Lead TO-92 XXXXXXXXXXXXXXXXXXYWWNNNE xample54VN30021256 informationYYear code (last digit of calendar year)YYYear code (last 2 digits of calendar year)WWWeek code (week of January 1 is week 01 )NNNA lphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn)*This package is Pb-free.

10 The Pb-free JEDEC designator ( )can be found on the outer packaging for this :In the event the full Microchip part number cannot be marked on one line, it willbe carried over to the next line, thus limiting the number of availablecharacters for customer-specific 8 2001-2014 Microchip Technology Inc.) SOT-23A3-Pin SOT-89112243431represents output configuration (CMOS or Nch) and first integer of voltage Ex: CMOS = D2represents first decimal of output voltage (0-9) Ex: CMOS = D443 represent assembly lot Time0No DelaySymbolAccuracy1 (custom)2 (standard)3-Pin TO-9284736251= 54X (fixed)1 ,2 and3 4represents output configuration (CMOS or N-Ch) Ex: CMOS = C5represents first integer of detect voltage6represents first decimal of detect voltage7represents the output delay timerepresents the device accuracy8 2001-2014 Microchip Technology 9TC54 !