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TL7770-12-二路 Svs，12V 可编程、具有可编程时间延迟
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TI产品 - TL7770-12介绍

TL7770-12 - 二路 Svs，12V 可编程、具有可编程时间延迟

TL7770-12是TI德州仪器公司的一款无产品，TL7770-12是二路 Svs，12V 可编程、具有可编程时间延迟，本站介绍了TL7770-12的封装应用图解、特点和优点、功能等，并给出了与TL7770-12相关的TI元器件型号供参考。

TL7770-12 - 二路 Svs，12V 可编程、具有可编程时间延迟 - 无 - 监控器和复位IC - 德州仪器

产品描述

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: td 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.

产品特性

  • Power-On Reset Generator
  • Automatic Reset Generation After Voltage Drop
  • RESET\ Defined When VCC Exceeds 1 V
  • Wide Supply-Voltage Range...3.5 V to 18 V
  • Precision Overvoltage and Undervoltage Sensing
  • 250-mA Peak Output Current for Driving SCR Gates
  • 2-mA Active-Low SCR Gate Drive for False-Trigger Protection
  • Temperature-Compensated Voltage Reference
  • True and Complementary Reset Outputs
  • Externally Adjustable Output Pulse Duration

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