Datenblatt-Suchmaschine für elektronische Bauteile |
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TL7770-5IDWG4 Datenblatt(PDF) 1 Page - Texas Instruments |
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TL7770-5IDWG4 Datenblatt(HTML) 1 Page - Texas Instruments |
1 / 18 page TL7770-5, TL7770-12 DUAL POWER-SUPPLY SUPERVISORS SLVS019F – OCTOBER 1987 – REVISED JULY 1999 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Power-On Reset Generator D Automatic Reset Generation After Voltage Drop D RESET Defined When VCC Exceeds 1 V D Wide Supply-Voltage Range . . . 3.5 V to 18 V D Precision Overvoltage and Undervoltage Sensing D 250-mA Peak Output Current for Driving SCR Gates D 2-mA Active-Low SCR Gate Drive for False-Trigger Protection D Temperature-Compensated Voltage Reference D True and Complementary Reset Outputs D Externally Adjustable Output Pulse Duration description The TL7770 is an integrated-circuit system supervisor designed for use as a reset controller in microcomputer and microprocessor power-supply systems. This device contains two independent supply-voltage supervisors that monitor the supplies for overvoltage and undervoltage conditions at the VSO and VSU terminals, respectively. When VCC attains the minimum voltage of 1 V during power up, the RESET output becomes active (low). As VCC approaches 3.5 V, the time-delay function activates, latching RESET and RESET active (high and low, respectively) for a time delay (td) after system voltages have achieved normal levels. Above VCC = 3.5 V, taking RESIN low activates the time-delay function during normal system-voltage levels. To ensure that the microcomputer system has reset, the outputs remain active until the voltage at VSU exceeds the threshold value, VIT+, for a time delay, which is determined by an external timing capacitor such that: t d [ 20 103 capacitance where td is in seconds and capacitance is in farads. The overvoltage-detection circuit is programmable for a wide range of designs. During an overvoltage condition, an internal silicon-controlled rectifier (SCR) is triggered, providing 250-mA peak instantaneous current and 25-mA continuous current to the SCR gate drive terminal, which can drive an external high-current SCR gate or an overvoltage-warning circuit. The TL7770C series is characterized for operation from 0 °C to 70°C. The TL7770I series is characterized for operation from –40 °C to 85°C. 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. 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. DW OR N PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 1RESIN 1CT 1RESET 1RESET 1VSU 1VSO 1SCR DRIVE GND VCC 2RESIN 2CT 2RESET 2RESET 2VSU 2VSO 2SCR DRIVE |
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Ähnliche Beschreibung - TL7770-5IDWG4 |
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