TL7770-12 Series

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

Catalog

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

Part	Voltage - Threshold	Voltage - Threshold	Reset	Reset Timeout	Type	Output	Package / Case [x]	Package / Case	Package / Case [y]	Number of Voltages Monitored	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package	Mounting Type
Texas Instruments TL7770-5IDW	5 V	Adj	Active High/Active Low	270 ns	Multi-Voltage Supervisor	Open Drain or Open Collector	0.295 in	16-SOIC	7.5 mm	2	85 °C	-40 °C	16-SOIC	Surface Mount
Texas Instruments TL7770-12CDWR	12 V		Active High/Active Low	270 ns	Multi-Voltage Supervisor	Open Drain or Open Collector	0.295 in	16-SOIC	7.5 mm	2	70 °C	0 °C	16-SOIC	Surface Mount
Texas Instruments TL7770-5CDWR	5 V	Adj	Active High/Active Low	270 ns	Multi-Voltage Supervisor	Open Drain or Open Collector	0.295 in	16-SOIC	7.5 mm	2	70 °C	0 °C	16-SOIC	Surface Mount
Texas Instruments TL7770-5CDW	5 V	Adj	Active High/Active Low	270 ns	Multi-Voltage Supervisor	Open Drain or Open Collector	0.295 in	16-SOIC	7.5 mm	2	70 °C	0 °C	16-SOIC	Surface Mount
Texas Instruments TL7770-12CDW	12 V		Active High/Active Low	270 ns	Multi-Voltage Supervisor	Open Drain or Open Collector	0.295 in	16-SOIC	7.5 mm	2	70 °C	0 °C	16-SOIC	Surface Mount
Texas Instruments TL7770-5IDWR	5 V	Adj	Active High/Active Low	270 ns	Multi-Voltage Supervisor	Open Drain or Open Collector	0.295 in	16-SOIC	7.5 mm	2	85 °C	-40 °C	16-SOIC	Surface Mount

Catalog

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

Key Features

• Power-On Reset GeneratorAutomatic Reset Generation After Voltage DropRESET\ Defined When VCCExceeds 1 VWide Supply-Voltage Range...3.5 Vto 18 VPrecision Overvoltage and Undervoltage Sensing250-mA Peak Output Current for Driving SCR Gates2-mA Active-Low SCR Gate Drive for False-Trigger ProtectionTemperature-Compensated Voltage ReferenceTrue and Complementary Reset OutputsExternally Adjustable Output Pulse DurationPower-On Reset GeneratorAutomatic Reset Generation After Voltage DropRESET\ Defined When VCCExceeds 1 VWide Supply-Voltage Range...3.5 Vto 18 VPrecision Overvoltage and Undervoltage Sensing250-mA Peak Output Current for Driving SCR Gates2-mA Active-Low SCR Gate Drive for False-Trigger ProtectionTemperature-Compensated Voltage ReferenceTrue and Complementary Reset OutputsExternally 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 VCCattains the minimum voltage of 1 V during power up, the RESET\ output becomes active (low). As VCCapproaches 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:td20 × 103× capacitance where tdis 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 VCCattains the minimum voltage of 1 V during power up, the RESET\ output becomes active (low). As VCCapproaches 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:td20 × 103× capacitance where tdis 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.