Overview
The TL7700CPWRE4, produced by Texas Instruments, is a bipolar integrated circuit designed as a supply-voltage supervisor for use in microcomputer and microprocessor systems. It serves as a reset controller, ensuring stable operation by monitoring the supply voltage and generating a reset signal when the voltage falls below a set threshold. The device is highly versatile, with adjustable sense voltage and hysteresis, making it suitable for a wide range of applications including digital signal processors, microcontrollers, FPGAs, and industrial control systems.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC Supply Voltage | 1.8 | 40 | V | ||
| SENSE Input Voltage | 0.5 | 0.5 | 41 | V | |
| Operating Temperature Range | -40 | 85 | °C | ||
| Supply Current (ICC) | VCC = 40 V, Vs = 0.6 V, No load | 0.6 | 1 | mA | |
| Low-Level Output Voltage (VOL) | IOL = 1.5 mA | 0.4 | 0.8 | V | |
| Output Pulse Duration (tpo) | CT = 0.01 µF | 0.5 | 1 | 1.5 | ms |
| Output Rise Time (tr) | CT = 0.01 µF, RL = 2.2 kΩ, CL = 100 pF | 15 | µs | ||
| Output Fall Time (tf) | CT = 0.01 µF, RL = 2.2 kΩ, CL = 100 pF | µs |
Key Features
- Adjustable Sense Voltage: The sense voltage can be set to any value greater than 0.5 V using two external resistors.
- Adjustable Hysteresis: The hysteresis value of the sense voltage can also be set using the same external resistors.
- Wide Operating Supply-Voltage Range: Operates within a supply voltage range of 1.8 V to 40 V.
- Wide Operating Temperature Range: Functions from -40°C to 85°C.
- Low Power Consumption: Typical supply current is 0.6 mA at VCC = 40 V.
- Precision Voltage Reference: Includes a 1.5-V temperature-compensated voltage reference.
- Fast Comparator and Timing Generator: Generates a power-on reset signal in digital systems.
- Open-Collector Output: Requires a pull-up resistor for the RESET output.
Applications
- Digital Signal Processors (DSPs): Monitors and controls the supply voltage for DSPs.
- Microcontrollers (MCUs): Ensures stable operation of MCUs by monitoring the supply voltage.
- FPGAs and ASICs: Used in field-programmable gate arrays and application-specific integrated circuits.
- Notebooks and Desktop Computers: Monitors the supply voltage in computer systems.
- Set-Top Boxes: Used in consumer electronics for voltage supervision.
- Industrial Control Systems: Monitors and controls the supply voltage in industrial settings.
Q & A
- What is the primary function of the TL7700CPWRE4?
The primary function of the TL7700CPWRE4 is to serve as a supply-voltage supervisor and reset controller in microcomputer and microprocessor systems.
- What is the adjustable sense voltage range of the TL7700CPWRE4?
The sense voltage can be set to any value greater than 0.5 V using two external resistors.
- What is the operating supply-voltage range of the TL7700CPWRE4?
The device operates within a supply voltage range of 1.8 V to 40 V.
- What is the operating temperature range of the TL7700CPWRE4?
The device functions from -40°C to 85°C.
- How is the hysteresis of the sense voltage set?
The hysteresis value of the sense voltage can be set using the same external resistors used to set the sense voltage.
- What is the typical supply current of the TL7700CPWRE4?
The typical supply current is 0.6 mA at VCC = 40 V.
- Does the TL7700CPWRE4 require a pull-up resistor for the RESET output?
Yes, the TL7700CPWRE4 has an open-collector output and requires a pull-up resistor for the RESET output.
- What types of applications can the TL7700CPWRE4 be used in?
The TL7700CPWRE4 can be used in applications such as digital signal processors, microcontrollers, FPGAs, notebooks, desktop computers, set-top boxes, and industrial control systems.
- How is the output pulse duration set for the TL7700CPWRE4?
The output pulse duration is set using a timing capacitor; the duration is calculated as tpo = Ct × 10^5 seconds.
- What is the significance of the precision voltage reference in the TL7700CPWRE4?
The precision voltage reference is temperature-compensated and ensures stable operation of the device by supplying all function blocks.
