Rs232-to-cmos-line-receiver
This RS-232 type line receiver is designed to drive CMOS logic and incorporates a Schmitt-trigger feedback network that provides approximately 1-V input hysteresis, enhancing noise immunity. A potential issue in an interface connecting two devices, each connected to different AC receptacles, is that power line voltage may appear at the receiver input during the connection or disconnection of the interface. The inclusion of two diodes and a 3-W input resistor serves to protect the inputs under these circumstances.
The RS-232 line receiver is a critical component in ensuring reliable communication between devices operating at different voltage levels. The Schmitt-trigger feedback network is essential for establishing a clear transition between logic states, which is particularly beneficial in environments with significant electrical noise. The 1-V hysteresis helps to prevent false triggering that can occur due to minor fluctuations in the input signal, thus improving the overall robustness of the communication link.
In scenarios where two devices are interfaced, the risk of power line voltage appearing at the receiver input can lead to damage or erroneous operation. The protective circuit, comprising two diodes, functions by clamping any excessive voltage that may reach the input terminals. This arrangement ensures that the voltage remains within safe limits, thereby safeguarding the internal components of the receiver.
The use of a 3-W input resistor is also critical, as it limits the current that can flow into the receiver during abnormal conditions. This resistor works in conjunction with the diodes to provide an additional layer of protection, ensuring that the receiver can withstand transient voltages without sustaining damage.
Overall, the design of this RS-232 line receiver effectively addresses potential vulnerabilities associated with interfacing different pieces of equipment, ensuring reliable performance and longevity of the components involved.This RS-232 type line receiver to drive CMOS logic uses a Schmitt-trigger feedback network to ~give about 1-V input hysteresis for added noise immunity. A possible problem in an interface which connects two pieces of equipment, each plugged into a different ac receptacle, is that the power line voltage might appear at the receiver input when the interface connection is made or broken.
The two diodes and a 3-W input resistor will protect the inputs under these conditions. 🔗 External reference
The RS-232 line receiver is a critical component in ensuring reliable communication between devices operating at different voltage levels. The Schmitt-trigger feedback network is essential for establishing a clear transition between logic states, which is particularly beneficial in environments with significant electrical noise. The 1-V hysteresis helps to prevent false triggering that can occur due to minor fluctuations in the input signal, thus improving the overall robustness of the communication link.
In scenarios where two devices are interfaced, the risk of power line voltage appearing at the receiver input can lead to damage or erroneous operation. The protective circuit, comprising two diodes, functions by clamping any excessive voltage that may reach the input terminals. This arrangement ensures that the voltage remains within safe limits, thereby safeguarding the internal components of the receiver.
The use of a 3-W input resistor is also critical, as it limits the current that can flow into the receiver during abnormal conditions. This resistor works in conjunction with the diodes to provide an additional layer of protection, ensuring that the receiver can withstand transient voltages without sustaining damage.
Overall, the design of this RS-232 line receiver effectively addresses potential vulnerabilities associated with interfacing different pieces of equipment, ensuring reliable performance and longevity of the components involved.This RS-232 type line receiver to drive CMOS logic uses a Schmitt-trigger feedback network to ~give about 1-V input hysteresis for added noise immunity. A possible problem in an interface which connects two pieces of equipment, each plugged into a different ac receptacle, is that the power line voltage might appear at the receiver input when the interface connection is made or broken.
The two diodes and a 3-W input resistor will protect the inputs under these conditions. 🔗 External reference