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| 1 TC54 VOLTAGE DETECTOR FEATURES s s s s s Precise Detection Thresholds .... Standard 2.0% Custom 1.0% Small Packages ........... SOT-23A-3, SOT-89, TO-92 Low Current Drain ..................................... Typ. 1A Wide Detection Range .......................... 2.1V to 6.0V Wide Operating Voltage Range ............ 1.5V to 10V GENERAL DESCRIPTION The TC54 Series are CMOS voltage detectors, suited especially for battery-powered applications because of their extremely low 1A operating current and small surfacemount packaging. Each part is laser trimmed to the desired threshold voltage which can be specified from 2.1V to 6.0V, in 0.1V steps. The device includes a comparator, low-current highprecision reference, laser-trimmed divider, hysteresis circuit and output driver. The TC54 is available with either an opendrain or complementary output stage. In operation, the TC54's output (VOUT) remains in the logic HIGH state as long as VIN is greater than the - specified threshold voltage (VDET). When VIN falls below - V DET, the output is driven to a logic LOW. VOUT remains LOW until VIN rises above V- DET by an amount V HYST, whereupon it resets to a logic HIGH. 2 3 4 5 6 7 APPLICATIONS s s s s s Battery Voltage Monitoring Microprocessor Reset System Brownout Protection Switching Circuit in Battery Backup Level Discriminator PIN CONFIGURATIONS *SOT-23A-3 VIN 2 123 SOT-89-3 TO-92 ORDERING INFORMATION PART CODE TC54 V X XX X X X XX XXX Output form: N = Nch Open Drain C = CMOS Output Detected Voltage: Ex: 21 = 2.1V; 60 = 6.0V Extra Feature Code: Fixed: 0 Tolerance: 1 = 1.0% (custom) 2 = 2.0% (standard) TC54VC only TC54 3 VSS TC54 1 VOUT 2 VIN 3 VSS TC54 1 VOUT VOUT *SOT-23A-3 is equivalent to EIAJ (SC-59) FUNCTIONAL BLOCK DIAGRAM 2 VIN VIN VSS Temperature: E: - 40C to + 85C Package Type and Pin Count: CB: SOT-23A-3*, MB: SOT-89-3, ZB: TO-92-3 - + VOUT 1 Taping Direction: Standard Taping Reverse Taping No suffix: TO-92 Bulk *SOT-23A-3 is equivalent to EIAJ (SC-59). VREF VSS 3 TC54VN has open-drain output. TC54VC has complementary output. TC54-10 11/8/96 8 4-279 TELCOM SEMICONDUCTOR, INC. VOLTAGE DETECTOR TC54 ABSOLUTE MAXIMUM RATINGS* Supply Voltage (VIN) ..................................................................... 12V Output Voltage: CMOS ............ (VSS - 0.3) to (VIN + 0.3) Open Drain ................. (VSS - 0.3) to 12V Output Current .........................................................50mA Power Dissipation: (TA 70C) SOT-23A-3 .....................................................240mW SOT-89-3 .......................................................400mW TO-92 .......................................................440mW Operating Temperature .......................... - 40C to + 85C Storage Temperature ........................... - 65C to + 150C Soldering Temperature ...................... 300C, 10 seconds * Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS: TA = 25C, unless otherwise specified. Symbol VIN ISS Parameter Operating Voltage Quiescent Current Test Conditions V- DET VIN = = 2.1 to 6.0V 2.1V 3.0V 4.0V 5.0V Min 1.5 Typ 1.0 1.3 1.6 2.0 Max 10.0 3.0 3.4 3.8 4.2 (V- ) DET x 1.02 (V- ) DET x 0.08 Unit V A - VDET Threshold Voltage Hysteresis Range Output Current Nch VDS = 0.5 VIN = 2.1V 3.0V 4.0V 5.0V VIN = 8.0V VHYST IOUT (V- ) DET x 0.98 (V- ) DET x 0.02 V V mA (V- ) DET x 0.05 7.7 10.1 11.5 13.0 - 10.0 100 - TC (VDET) - Tempco of (VDET) Pch VDS = 2.1V - 40C TA 85C ppm/C PIN DESCRIPTION Pin No. 1 2 3 Symbol VIN VOUT VSS Description Analog input. This pin is both the power supply input and the voltage to be monitored. - Digital output. This output goes low when VIN drops below VDET and returns - high when VIN rises above V DET + VHYST. (See timing chart). Ground terminal. 4-280 TELCOM SEMICONDUCTOR, INC. VOLTAGE DETECTOR 1 TC54 DESCRIPTION OF OPERATION TIMING CHART VIN + VDET VHYST RELEASE RESET OR VOLTAGE VOLTAGE - DETECT VOLTAGE VDET MINIMUM OPERATING VOLTAGE GROUND LEVEL OUTPUT VOLTAGE GROUND LEVEL Refer to the Timing Chart below. In normal steady-state - operation, when VIN > VDET, the output will be at a logic high. In the case of the TC54V, this is an open-drain condition. If - and when the input falls below VDET, the output will pull down (Logic 0) to VSS. Generally, VOUT can pull down to within 0.5V of VSS at rated output current and input voltage. (See the Electrical Characteristics section). The output, VOUT, will stay valid until the input voltage falls below the Minimum Operating Voltage, VIN(MIN), of 1.5V. Below this minimum operating voltage, the output is undefined. During power-up or anytime VIN has fallen below VIN (MIN), VOUT will remain undefined until VIN rises above VIN(MIN), at which time the output will become valid. VOUT + will be in its active low state while VIN(MIN) < VIN < VDET. + - (VDET = VDET + VHYST). If and when the input rises above V+ , the output will assume its inactive state. (High for DET TC54VC, open-drain for TC54VN). 2 3 4 5 6 7 APPLICATIONS Refer to TelCom Semiconductor Application Note #2, Using the TC54 Voltage Detector. MARKING SOT-23A-3 SOT-89-3 TO-92 1234 5678 9 10 11 12 = output (Nch or CMOS) plus first voltage digit 23456 Nch MNPRS CMOS CDEFH D ex: CMOS 3.x = kkkk = first voltage decimal (0-9) D4 ex: CMOS 3.4 = kkkk & = assembly lot number , & = 54_ (fixed) = output (C = CMOS, N = Nch) = first voltage digit (2-6) = first voltage decimal (0-9) = extra feature code : fixed : 0 = detecting accuracy 1 = 1.0% (custom), 2 = 2.0% (standard) , , & = assembly lot number 8 TELCOM SEMICONDUCTOR, INC. 4-281 |
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