SN65HVD21DR

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The SN65HVD21DR is a differential bus line transceiver with two drivers/receivers used in applications requiring low electromagnetic EMF emission over long bus lines. The device works with TTL and CMOS logic in both the receiver side and driver side and is capable of maintaining stable performance in harsh electrical condition. This article aims to understand the SN65HVD21DR’s application field and working principle.

Applications

The SN65HVD21DR is usually found in such applications as high speed serial communications (including can bus, RS-232, etc.), industrial automation control, automotive communication systems, point-of-sales devices, printers, smartphones, and wearable devices. As its application field covers a wide range of areas, this device is widely used due to its superior electrical characteristics.

Working Principle of SN65HVD21DR

When the signal from the parallel interface can be received by the device’s receiver terminal, the SN65HVD21DR transceiver inputs the signal to the internal circuit and the current is amplified, then the amplified signal is transmitted to the driver output terminal. The device’s driver impedance is measured in ohms; the SN65HVD21DR can drive up to 1500 ohms, thus providing a reliable transmission of the signal on both sides as the signal is carried over a long distance.

The SN65HVD21DR device relays the signal between the two drivers/receivers. On the driver side, the device is capable of providing differential output signals, while on the receiver side it receives logic states. The SN65HVD21DR provides rejection of common-mode noises due to its differential transceiver Architecture. The transceiver’s send and receive signals have the same frequency, but have opposite phase.

Features of SN65HVD21DR

The SN65HVD21DR transceiver has many features. It offers an exceptional EMI emission reduction by isolating the user from the outside environment, allowing for more reliable data transmission. The device also has an exceptionally low power consumption of 4.0 mW, an ESD protection of 4KV, a wide operating temperature range of -40 to +125°C, and a maximum data rate of 6Mbps.

The SN65HVD21DR is also RoHS compliant and is available in DFN (Dual Flat Non-Leaded) and SOIC (Small Outline Integrated Circuit) packages, making it easier to integrate into projects. It also has an embedded Hysteresis to prevent false triggering.

Conclusion

The SN65HVD21DR transceiver is an ideal choice for applications that require low EMF emission, low power consumption, high EMI reduction, and high noise immunity. The device also features ESD protection and a wide operating temperature range. Furthermore, the SN65HVD21DR is RoHS compliant and comes in SOIC and DFN packages. All of these features make the SN65HVD21DR an optimum choice for high speed serial communication, industrial automation, printing and many other applications.

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