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| TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220B - JULY 1999 - REVISED AUGUST 2000 D D D D D D D Adjustable Sense Voltage With Two External Resistors Adjustable Hysteresis of Sense Voltage Wide Operating Supply-Voltage Range . . . 1.8 V to 40 V Wide Operating-Temperature Range . . . -40C to 85C Low Power Consumption (ICC = 0.6 mA TYP, VCC = 40 V) Minimum External Components Package Options Include Plastic Small-Outline (PS) and Thin Shrink Small-Outline (PW) Packages and Standard DIP (P) P, PS, OR PW PACKAGE (TOP VIEW) CT SENSE NC GND 1 2 3 4 8 7 6 5 RESET NC NC VCC NC - No internal connection description The TL7700 is a bipolar integrated circuit designed for use as a reset controller in microcomputer and microprocessor systems. The SENSE voltage can be set to any value greater than 0.5 V using two external resistors. The hysteresis value of the sense voltage also can be set by the same resistors. The device includes a precision voltage reference, fast comparator, timing generator, and output driver, so it can generate a power-on reset signal in a digital system. The TL7700 has an internal 1.5-V temperature-compensated voltage reference from which all function blocks are supplied. Circuit function is very stable, with supply voltage in the 1.8-V to 40-V range. Minimum supply current allows use with ac line operation, portable battery operation, and automotive applications. The TL7700C is characterized for operation from -40C to 85C. AVAILABLE OPTIONS PACKAGED DEVICES TA PLASTIC DIP (P) TL7700CP PLASTIC SMALL OUTLINE (PS) TL7700CPS PLASTIC THIN SHRINK SMALL OUTLINE (PW) TL7700CPW -40C to 85C PS and PW packages are available taped and reeled. Add the suffix R to device type (e.g., TL7700CPSR). Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright (c) 2000, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 1 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220B - JULY 1999 - REVISED AUGUST 2000 functional block diagram VCC Vs = 500 mV TYP Reference Voltage RESET + SENSE - ICT High: On R Q + - + - IS S GND ICT = 15 A TYP; Is = 2.5 A TYP CT Terminal Functions TERMINAL NAME NO. DESCRIPTION Timing capacitor connection. This terminal sets the RESET output pulse duration (tpo). It is connected internally to a 15-A constant-current source. There is a limit on the switching speed of internal elements; even if CT is set to 0, response speeds remain at approximately 5 to 10 s. If CT is open, the device can be used as an adjustable-threshold noninverting comparator. If CT is low, the internal output-stage comparator is active and the RESET output transistor is on. An external voltage must not be applied to this terminal due to the internal structure of the device. Therefore, drive the device using an open-collector transistor, FET, or 3-state buffer (in the low-level or high-impedance state). Ground. Keep this terminal as low impedance to reduce circuit noise. No internal connection Reset output. This terminal can be connected directly to a system that resets in the active-low state. A pullup resistor usually is required because the output is an npn open-collector transistor. An additional transistor should be connected when the active-high reset or higher output current is required. Voltage sense. This terminal has a threshold level of 500 mV. The sense voltage and hysteresis can be set at the same time when the two voltage-dividing resistors are connected. The reference voltage is temperature compensated to inhibit temperature drift in the threshold voltage within the operating temperature range. Power supply. This terminal is used in an operating-voltage range of 1.8 V to 40 V. CT 1 GND NC RESET 4 3, 6, 7 8 SENSE VCC 2 5 2 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220B - JULY 1999 - REVISED AUGUST 2000 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 V Sense input voltage range, Vs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to 41 V Output voltage, VOH (off state) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 V Output current, IOL (on state) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA Package thermal impedance, JA (see Notes 2 and 3): P package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85C/W PS package . . . . . . . . . . . . . . . . . . . . . . . . . . . 95C/W PW package . . . . . . . . . . . . . . . . . . . . . . . . . 149C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65C to 150C Stresses beyond 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 beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. All voltage values are with respect to the network ground terminal. 2. Maximum power dissipation is a function of TJ(max), JA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) - TA)/JA. Operating at the absolute maximum TJ of 150C can impact reliability. 3. The package thermal impedance is calculated in accordance with JESD 51. recommended operating conditions MIN Supply voltage, VCC Low-level output current, IOL Operating free-air temperature, TA -40 1.8 NOM MAX 40 3 85 UNIT V mA C electrical characteristics, VCC = 3 V, TA = 25C (unless otherwise noted) PARAMETER Vs Is ICC VOL IOH ICT SENSE input voltage SENSE input current Supply current Low-level Low level output voltage High-level output current Timing-capacitor charge current TEST CONDITIONS TA = -40C to 85C Vs = 0 4 V 0.4 VCC = 40 V, IOL = 1.5 mA IOL = 3 mA VOH = 40 V, Vs = 0.6 V TA = -40C to 85C Vs = 0.6 V, No load MIN 495 490 2 1.5 0.6 2.5 TYP 500 MAX 505 510 3 3.5 1 0.4 0.8 Vs = 0.6 V, TA = -40C to 85C 11 15 1 19 UNIT mV A mA V A A switching characteristics, VCC = 3 V, TA = 25C (unless otherwise noted) PARAMETER tpi tpo tr tf tpd SENSE pulse duration Output pulse duration Output rise time Output fall time Propagation delay time, SENSE to output CT = 0.01 F CT = 0.01 F CT = 0.01 F, CT = 0.01 F, CT = 0.01 F RL = 2.2 k, RL = 2.2 k, CL = 100 pF CL = 100 pF TEST CONDITIONS MIN 2 0.5 1 1.5 15 0.5 10 TYP MAX UNIT s ms s s s POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 3 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220B - JULY 1999 - REVISED AUGUST 2000 PARAMETER MEASUREMENT INFORMATION - A + VCC Vs SENSE VCC 0.6 V GND Figure 1. VCC vs ICC Measurement Circuit VCC Vs SENSE CT + VCC 0.6 V GND A - Figure 2. VCC vs ICT Test Point VCC RESET Vs SENSE CT 0.4 V GND 0.01 F 3V Figure 3. IOL vs VOL 4 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220B - JULY 1999 - REVISED AUGUST 2000 PARAMETER MEASUREMENT INFORMATION 2.2 k VCC RESET + A - Vs SENSE CT Vs GND 0.01 F Test Point VCC Figure 4. VS, IS Characteristics 2.2 k VCC RESET Vs SENSE CT GND 100 pF Ct 3V Test Point Figure 5. Switching Characteristics POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 5 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220B - JULY 1999 - REVISED AUGUST 2000 TYPICAL CHARACTERISTICS SUPPLY CURRRENT vs SUPPLY VOLTAGE 1.2 1.0 0.8 Timing-Capacitor Charge Current Supply - mV TIMING-CAPACITOR CHARGE CURRENT vs SUPPLY VOLTAGE 16 TA = -40C 15 14 TA = 25C I CC - Supply Current - mA 0.6 0.4 TA = 85C TA = 25C TA = -40C 13 12 TA = 85C 0.2 0 0 10 20 30 40 50 60 VCC - Supply Voltage - V 11 10 0 10 20 30 40 50 60 VCC - Supply Voltage - V Figure 6 Figure 7 VOL vs IOL 1.2 VOL - Low-Level Output Voltage - V 1.0 0.8 0.6 TA = 85C 506 504 Vs - Sense Input Voltage - mV 502 500 498 496 494 492 490 0 0 1 2 3 4 5 6 IOL - Low-Level Output Current - mA SENSE INPUT VOLTAGE vs TEMPERATURE TA = 25C Vs = 500.8 mV TA = 25C TA = -40C 0.4 0.2 TA = 25C Vs = 498.3 mV 488 -75 -50 -25 0 25 50 75 100 125 150 TA - Free-Air Temperature - C Figure 8 Figure 9 Data at high and low temperatures are applicable only within the recommended operating conditions. 6 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220B - JULY 1999 - REVISED AUGUST 2000 TYPICAL CHARACTERISTICS SENSE INPUT CURRENT vs TEMPERATURE 3.4 3.2 I s - Sense Input Current - A I s - Sense Input Current - A 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 -75 -50 -25 0 25 50 75 100 125 150 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -0.5 -1.0 0 0.1 0.2 0.3 0.4 0.5 0.6 1.0 10 Vs - Sense Input Voltage - V 40 SENSE INPUT CURRENT vs SENSE INPUT VOLTAGE TA - Free-Air Temperature - C Figure 10 Figure 11 109 t po - Output Pulse Duration - s 108 107 106 105 104 103 102 101 1 1 OUTPUT PULSE DURATION vs TIMING CAPACATOR 101 102 103 104 105 106 107 108 109 Ct - Timing Capacitor - pF Figure 12 Data at high and low temperatures are applicable only within the recommended operating conditions. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 7 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220B - JULY 1999 - REVISED AUGUST 2000 TYPICAL CHARACTERISTICS 2.2 k 240 k VCC RESET Vs SENSE CT 30 k GND 100 pF 510 pF Test Point 2 6V Y-Axis (TP1) = 1 V/Division Y-Axis (TP2) = 2 V/Division Test Point 1 TP1 TP2 X-Axis = 0.2 ms/Division Figure 13. VCC vs Output Test Circuit 1 Figure 14. VCC vs Output Waveform 1 2.2 k 240 k VCC RESET Vs SENSE 6V CT 30 k GND 100 pF 510 pF Test Point 2 Y-Axis (TP1) = 1 V/Division Y-Axis (TP2) = 2 V/Division Test Point 1 TP1 TP2 X-Axis = 0.2 ms/Division Figure 15. VCC vs Output Test Circuit 2 Figure 16. VCC vs Output Waveform 2 8 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220B - JULY 1999 - REVISED AUGUST 2000 TYPICAL CHARACTERISTICS 2.2 k 240 k VCC RESET Vs SENSE CT 30 k GND 100 pF 510 pF Test Point 2 Y-Axis (TP1) = 1 V/Division Y-Axis (TP2) = 2 V/Division Test Point 1 TP1 TP2 X-Axis = 0.2 ms/Division Figure 17. VCC vc Output Test Circuit 3 Figure 18. VCC vs Output Waveform 3 detailed description sense-voltage setting The SENSE terminal input voltage, Vs, of the TL7700 typically is 500 mV. By using two external resistors, the circuit designer can obtain any sense voltage over 500 mV. In Figure 19, the sensing voltage, Vs', is calculated as: Vs' = Vs x (R1 + R2)/R2 Where: Vs = 500 mV, typically at TA = 25C At room temperature, Vs has a variation of 500 mV 5 mV. In the basic circuit shown in Figure 19, variations of [5 x (R1 + R2)/R2] mV are superimposed on Vs. VCC RL R1 VCC RESET Vs SENSE CT R2 GND Ct GND RESET Figure 19 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 9 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220B - JULY 1999 - REVISED AUGUST 2000 sense-voltage hysteresis setting If the sense voltage, Vs', does not have hysteresis in it and the voltage on the sensing line contains ripples, the resetting of TL7700 will be unstable. Hysteresis is added to the sense voltage to prevent such problems. As shown in Figure 20, the hysteresis, Vhys, is added, and the value is determined as: Vhys = Is x R1 Where: Is = 2.5 A, typically at TA = 25C At room temperature, Is has variations of 2.5 A 0.5 A. Therefore, in the circuit shown in Figure 19, Vhys has variations of (0.5 x R1) V. In circuit design, it is necessary to consider the voltage-dividing resistor tolerance and temperature coefficient in addition to variations in Vs and Vhys. VCC Vhys Vs' 1.5 V T RESET tpo tpo T NOTE A: The sense voltage, Vs', is different from the SENSE terminal input voltage, Vs. Vs is normally 500 mV for triggering. Figure 20. VCC-RESET Timing Chart output pulse-duration setting Constant-current charging starts on the timing capacitor when the sensing-line voltage reaches the TL7700 sense voltage. When the capacitor voltage exceeds the threshold level of the output drive comparator, RESET changes from a low to a high level. The output pulse duration is the time between the point when the sense-pin voltage exceeds the threshold level and the point when the RESET output changes from a low level to a high level. When the TL7700 is used for system power-on reset, the output pulse duration, tpo, must be set longer than the power rise time. The value of tpo is: tpo = Ct x 105 seconds Where: Ct is the timing capacitor in farads There is a limit on the device response speed. Even if Ct = 0, tpo is not 0, but approximately 5 s to 10 s. Therefore, when the TL7700 is used as a comparator with hysteresis, without connecting Ct, switching speeds (tr/tf, tpo/tpd, etc.) must be considered. 10 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright (c) 2000, Texas Instruments Incorporated |
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