TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220A – JULY 1999 – REVISED NOVEMBER 1999 D D D D D D D P, PS, OR PW PACKAGE (TOP VIEW) 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 . . . –40°C to 85°C 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) CT SENSE NC GND 1 8 2 7 3 6 4 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 –40°C to 85°C. AVAILABLE OPTIONS PACKAGED DEVICES TA –40°C to 85°C PLASTIC DIP (P) PLASTIC SMALL OUTLINE (PS) PLASTIC THIN SHRINK SMALL OUTLINE (PW) TL7700CP TL7700CPS TL7700CPW 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 1999, 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 SLVS220A – JULY 1999 – REVISED NOVEMBER 1999 functional block diagram VCC Vs = 500 mV TYP RESET Reference Voltage + – SENSE + + – – ICT† High: On R Q S IS† GND †ICT = 15 µA TYP; Is = 2.5 µA TYP CT Terminal Functions TERMINAL NAME CT GND NC 2 DESCRIPTION NO. 1 Timing capacitor connection. This terminal sets the RESET output pulse duration (tpo). It is connected internally to a 15-µA 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 µs. 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). 4 Ground. Keep this terminal as low impedance to reduce circuit noise. 3, 6, 7 No internal connection RESET 8 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. SENSE 2 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. VCC 5 Power supply. This terminal is used in an operating-voltage range of 1.8 V to 40 V. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220A – JULY 1999 – REVISED NOVEMBER 1999 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, θJA (see Notes 2 and 3): P package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85°C/W PS package . . . . . . . . . . . . . . . . . . . . . . . . . . . 95°C/W PW package . . . . . . . . . . . . . . . . . . . . . . . . . 149°C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C † 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), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can impact reliability. 3. The package thermal impedance is calculated in accordance with JESD 51. recommended operating conditions MIN Supply voltage, VCC NOM 1.8 Low-level output current, IOL Operating free-air temperature, TA –40 MAX UNIT 40 V 3 mA 85 °C electrical characteristics, VCC = 3 V, TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS Vs SENSE input voltage Is SENSE input current 4V Vs = 0 0.4 ICC Supply current VCC = 40 V, IOL = 1.5 mA TA = –40°C to 85°C VOL Low level output voltage Low-level IOH ICT High-level output current IOL = 3 mA VOH = 40 V, Timing-capacitor charge current Vs = 0.6 V MIN TYP MAX 495 500 505 490 2 TA = –40°C to 85°C Vs = 0.6 V, No load 510 2.5 1.5 3 3.5 0.6 1 0.4 0.8 Vs = 0.6 V, UNIT mV µA mA V 1 µA 11 15 19 µA MIN TYP MAX 1 1.5 ms TA = –40°C to 85°C switching characteristics, VCC = 3 V, TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS UNIT tpi tpo SENSE pulse duration CT = 0.01 µF 2 Output pulse duration CT = 0.01 µF 0.5 tr tf Output rise time CT = 0.01 µF, RL = 2.2 kΩ, CL = 100 pF 15 µs Output fall time CT = 0.01 µF, RL = 2.2 kΩ, CL = 100 pF 0.5 µs tpd Propagation delay time, SENSE to output CT = 0.01 µF 10 µs POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 µs 3 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220A – JULY 1999 – REVISED NOVEMBER 1999 PARAMETER MEASUREMENT INFORMATION – A + VCC Vs SENSE 0.6 V VCC GND Figure 1. VCC vs ICC Measurement Circuit VCC Vs SENSE CT VCC + 0.6 V A GND – Figure 2. VCC vs ICT Test Point VCC RESET Vs 3V SENSE CT 0.4 V GND 0.01 µF Figure 3. IOL vs VOL 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220A – JULY 1999 – REVISED NOVEMBER 1999 PARAMETER MEASUREMENT INFORMATION 2.2 kΩ VCC Test Point RESET + A – Vs VCC SENSE CT Vs GND 0.01 µF Figure 4. VS, IS Characteristics 2.2 kΩ VCC Test Point RESET Vs 3V SENSE CT GND 100 pF Ct Figure 5. Switching Characteristics POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220A – JULY 1999 – REVISED NOVEMBER 1999 SUPPLY CURRRENT vs SUPPLY VOLTAGE I CC – Supply Current – mA 1.2 1.0 0.8 TA = 85_C TA = 25_C TA = –40_C 0.6 0.4 0.2 0 0 10 20 30 40 50 60 Timing-Capacitor Charge Current Supply – mV TYPICAL CHARACTERISTICS† TIMING-CAPACITOR CHARGE CURRENT vs SUPPLY VOLTAGE 16 TA = –40_C 15 14 TA = 25_C 13 TA = 85_C 12 11 10 0 10 20 40 50 60 Figure 7 Figure 6 VOL vs IOL SENSE INPUT VOLTAGE vs TEMPERATURE 506 1.2 TA = 25_C VS = 500.8 mV 504 1.0 Vs – Sense Input Voltage – mV VOL – Low-Level Output Voltage – V 30 VCC – Supply Voltage – V VCC – Supply Voltage – V TA = 85_C 0.8 0.6 TA = 25_C 0.4 TA = –40_C 0.2 502 500 498 496 TA = 25_C VS = 498.3 mV 494 492 490 0 0 1 2 3 4 5 6 488 –75 –50 –25 0 IOL – Low-Level Output Current – mA Figure 9 Figure 8 † Data at high and low temperatures are applicable only within the recommended operating conditions. 6 25 POST OFFICE BOX 655303 50 75 100 125 150 TA – Free-Air Temperature – °C • DALLAS, TEXAS 75265 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220A – JULY 1999 – REVISED NOVEMBER 1999 TYPICAL CHARACTERISTICS† SENSE INPUT CURRENT vs SENSE INPUT VOLTAGE 3.4 3.5 3.2 3.0 I s – Sense Input Current – µ A I s – Sense Input Current – µ A SENSE INPUT CURRENT vs TEMPERATURE 3.0 2.8 2.6 2.4 2.2 2.0 2.5 2.0 1.5 1.0 0.5 0 –0.5 1.8 1.6 –75 –50 –25 –1.0 0 25 50 0 75 100 125 150 TA – Free-Air Temperature – °C 0.1 0.2 0.3 0.4 0.5 0.6 1.0 10 Vs – Sense Input Voltage – V Figure 10 Figure 11 OUTPUT PULSE DURATION vs TIMING CAPACATOR 109 t po – Output Pulse Duration – µ s 40 108 107 106 105 104 103 102 101 1 1 101 102 103 104 105 106 107 108 109 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 SLVS220A – JULY 1999 – REVISED NOVEMBER 1999 TYPICAL CHARACTERISTICS 2.2 kΩ 240 kΩ VCC Test Point 2 RESET Vs SENSE 6V CT 30 kΩ TP1 Y-Axis (TP1) = 1 V/Division Y-Axis (TP2) = 2 V/Division Test Point 1 TP2 GND 100 pF 510 pF X-Axis = 0.2 ms/Division Test Point 1 2.2 kΩ 240 kΩ VCC RESET Vs Test Point 2 SENSE 6V CT 30 kΩ Figure 14. VCC vs Output Waveform 1 TP1 Y-Axis (TP1) = 1 V/Division Y-Axis (TP2) = 2 V/Division Figure 13. VCC vs Output Test Circuit 1 TP2 GND 100 pF 510 pF X-Axis = 0.2 ms/Division Figure 15. VCC vs Output Test Circuit 2 8 POST OFFICE BOX 655303 Figure 16. VCC vs Output Waveform 2 • DALLAS, TEXAS 75265 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220A – JULY 1999 – REVISED NOVEMBER 1999 TYPICAL CHARACTERISTICS 2.2 kΩ 240 kΩ VCC Test Point 2 RESET Vs SENSE CT 30 kΩ TP1 Y-Axis (TP1) = 1 V/Division Y-Axis (TP2) = 2 V/Division Test Point 1 TP2 GND 100 pF 510 pF X-Axis = 0.2 ms/Division Figure 18. VCC vs Output Waveform 3 Figure 17. VCC vc Output Test Circuit 3 detailed description sense-voltage setting The sense 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, V′s, is calculated as: V′s = Vs × (R1 + R2)/R2 Where: Vs = 500 mV, typically at TA = 25°C At room temperature, Vs has a variation of 500 mV ± 5 mV. In the basic circuit shown in Figure 19, variations of [±5 × (R1 + R2)/R2] mV are superimposed on Vs. VCC RL VCC R1 RESET Vs RESET SENSE CT R2 GND Ct GND Figure 19 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 9 TL7700 SUPPLY-VOLTAGE SUPERVISOR SLVS220A – JULY 1999 – REVISED NOVEMBER 1999 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 × R1 Where: Is = 2.5 µA, typically at TA = 25°C At room temperature, Is has variations of 2.5 µA ± 0.5 µA. Therefore, in the circuit shown in Figure 19, Vhys has variations of (±0.5 × R1) µV. 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 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 × 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 µs to 10 µs. 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. 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