TL7770-5

ACTIVE

5-V, programmable, dual-supply supervisor with programmable delay time

Product details

Number of supplies monitored 2 Threshold voltage 1 (typ) (V) 4.55 Features Complimentary output, Manual reset capable, Undervoltage and overvoltage monitor, Wide input voltage Reset threshold accuracy (%) 2 Iq (typ) (mA) 5 Output driver type/reset output Active-high, Active-low, Open-drain Supply voltage (min) (V) 3.5 Supply voltage (max) (V) 18 Rating Catalog Watchdog timer WDI (s) None Operating temperature range (°C) -40 to 85
Number of supplies monitored 2 Threshold voltage 1 (typ) (V) 4.55 Features Complimentary output, Manual reset capable, Undervoltage and overvoltage monitor, Wide input voltage Reset threshold accuracy (%) 2 Iq (typ) (mA) 5 Output driver type/reset output Active-high, Active-low, Open-drain Supply voltage (min) (V) 3.5 Supply voltage (max) (V) 18 Rating Catalog Watchdog timer WDI (s) None Operating temperature range (°C) -40 to 85
PDIP (N) 16 181.42 mm² 19.3 x 9.4 SOIC (DW) 16 106.09 mm² 10.3 x 10.3
  • 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

  • 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

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.

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.

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Technical documentation

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Type Title Date
* Data sheet Dual Power-Supply Supervisors datasheet (Rev. F) 27 Jul 1999
Application note Optimizing Resistor Dividers at a Comparator (Rev. B) PDF | HTML 30 Apr 2021
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019

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PDIP (N) 16 Ultra Librarian
SOIC (DW) 16 Ultra Librarian

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