The model "TL7705ACDR" is a product from Texas Instruments. It is a voltage supervisor or reset IC designed for monitoring and controlling system Power . The "ACDR" in the part number represents a specific package and temperature range for the device.
Packaging and Pinout:
The TL7705ACDR is typically packaged in a 8-pin SOIC (Small Outline Integrated Circuit), though the exact packaging and pin configuration might vary depending on the specific version of the part number.
Below is the detailed explanation of the pin functions, assuming it’s the TL7705ACDR with an 8-pin SOIC package.
Pinout for TL7705ACDR (8-pin SOIC):
Pin # Pin Name Pin Function Description 1 VCC Power Supply Input (3V to 15V) 2 GND Ground 3 RESET Active low reset output (open-drain) 4 SENSE Voltage sense input for the threshold 5 NC No connection 6 VCC Power supply for the internal reference voltage (connect to VCC) 7 RESET Reset output, active low (open-drain) 8 VCC Power Supply Input (3V to 15V)Pin Function Breakdown:
VCC (Pin 1 & Pin 8): These pins provide the power supply input for the chip, typically ranging from 3V to 15V. This is where the operating voltage for the IC is connected.
GND (Pin 2): This pin is the ground reference for the IC.
RESET (Pin 3 & Pin 7): These pins are open-drain reset outputs, which means that the output will be pulled low when the voltage sense threshold is triggered, indicating that a reset is required. External pull-up resistors are often needed for these pins. When the monitored voltage is below the threshold, the output will be low, signaling the system to reset.
SENSE (Pin 4): This is the input pin where the monitored voltage is sensed. If the voltage on this pin falls below a set threshold, the reset output will be triggered.
NC (Pin 5): This pin is not connected to any internal circuit and should be left unconnected in the design.
VCC (Pin 6): This is an internal reference voltage supply pin that powers the internal circuitry of the IC. It is typically tied to the same supply voltage as Pin 1 and Pin 8.
Common FAQs:
1. What is the TL7705ACDR used for?
The TL7705ACDR is a voltage supervisor or reset IC that monitors the system voltage and issues a reset when the voltage falls below a defined threshold.2. What is the threshold voltage for TL7705ACDR?
The threshold voltage is typically around 4.65V, but it can be adjusted depending on the external resistor network or specific version of the part.3. How do I use the RESET pins?
The RESET pins (Pin 3 and Pin 7) are open-drain outputs. You need to use an external pull-up resistor to pull the line high when no reset condition is active.4. Can I connect both VCC pins together?
Yes, both VCC pins (Pin 1, Pin 6, and Pin 8) can be tied together as they all connect to the same power supply input.5. What should I connect to the SENSE pin?
The SENSE pin should be connected to the system voltage that you want to monitor. The reset will be triggered if this voltage falls below the threshold.6. What happens if the SENSE voltage is too high?
If the SENSE voltage exceeds the maximum threshold rating, the IC will not trigger a reset, and the system will continue operating normally.7. Can I use the TL7705ACDR with a 5V supply?
Yes, the TL7705ACDR can be used with a supply voltage between 3V and 15V, so 5V is well within the acceptable range.8. What is the purpose of the NC pin?
The NC (No Connection) pin is not connected to any internal circuitry. It should be left unconnected on the PCB.9. Can the RESET pin drive a high current load?
No, the RESET pin is an open-drain output, which can only pull low. If you need a higher current to drive other circuits, use an external transistor or MOSFET.10. What is the typical application of the TL7705ACDR?
The TL7705ACDR is commonly used in systems where voltage monitoring and power-on reset functionality are needed, such as microcontrollers, power supplies, and battery-powered systems.11. Does the TL7705ACDR have built-in hysteresis?
Yes, the TL7705ACDR has built-in hysteresis to prevent false triggering of the reset during voltage fluctuations near the threshold.12. How can I adjust the threshold voltage?
The threshold voltage can be adjusted using external resistors or selecting a different version of the part with a specific threshold.13. How much current does the TL7705ACDR consume?
The current consumption is minimal, typically in the microampere range, making it suitable for low-power applications.14. Can I use the TL7705ACDR with a 3.3V system?
Yes, it works with systems operating at 3.3V, provided the supply voltage is between 3V and 15V.15. What is the maximum reset duration?
The reset duration is typically defined by an internal timer, which can vary based on the version. It’s usually a few hundred milliseconds to seconds.16. Is the TL7705ACDR overvoltage protected?
The TL7705ACDR has built-in overvoltage protection to prevent damage to the IC from high input voltages.17. Can the reset output be used as an interrupt?
Yes, the reset output can be used to trigger interrupts in some systems if it’s routed through an interrupt controller.18. What is the response time of the TL7705ACDR?
The response time to voltage changes on the SENSE pin is typically very fast, typically within microseconds, but it depends on the specific threshold and system conditions.19. How do I connect external components to the TL7705ACDR?
External resistors are typically used to set the threshold voltage on the SENSE pin, and a pull-up resistor is used for the RESET pin.20. What is the recommended operating temperature range for the TL7705ACDR?
The recommended temperature range for the TL7705ACDR is typically from -40°C to +85°C, but this can vary depending on the specific version.This explanation provides detailed information about the TL7705ACDR in its 8-pin SOIC package, including all relevant pin functions and frequently asked questions.
