SN65HVD76DGSR

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1. Describe

These devices expand the RS-485 product portfolio with Full-duplex transceiver family with robust 3.3V voltage Drivers and receivers and high levels of ESD Protect. ESD protection includes > ±30kV HBM and > ±12kV IEC61000-4-2 contact discharge. Large receiver lag for SN65HVD7x device provides immunity to conducted differential noise and wide operating temperature make Reliability in harsh operating environments. this SN65HVD7x devices use standard SOIC package and small size MSOP pack. These devices each incorporate a differential driver and differential receiver, which operates from a single 3.3V power supply. Every driver and receiver has Separate input and output pins for full duplex bus Newsletter design. These devices have wide common-mode voltage range, which makes Equipment for long-term, multi-point applications Cable runs. SN65HVD71, SN65HVD74 and SN65HVD77 Device fully enabled, no external enablement required pin. SN65HVD70, SN65HVD73 and SN65HVD76 The device has a high driver enable and a low receiver enable. Low standby current below 5µA current can be achieved by disabling both drivers and receiver. These devices are characterized from –40°C to 125°C.

2. Feature

    1. 1/8 unit load option available

        – Up to 256 nodes on the bus

    2. Bus I/O Protection

        –> ±30kV HBM protection

        – > ±12kV IEC61000-4-2 contact discharge

        –> ±4kV IEC61000-4-4 Fast Transient Burst

    3. Extended industrial temperature range: –40°C to 125°C

    4. Large receiver hysteresis (70 mV) against noise Refuse

    5. Low power consumption

        – < 1.1mA quiescent current during operation

        – Low standby supply current: 10 nA typical, < 5 µA (max)

    6. Glitch-free power-up and power-down protection for hot-swap applications

    7. 5V tolerant logic inputs compatible with 3.3V or 5V controller

    8. Signaling rate options optimized for: 400 kbps (70, 71), 20 Mbps (73, 74), 50 Mbps (76, 77)

3. Application

    1. Electronic meters

    2. automated industry

    3. Building automation

    4. Security and surveillance

    5. Encoders and Decoders

4. Pin configuration

5. Pin Description

6. Function description

Internal ESD protection circuitry protects the transceiver from electrostatic discharge (ESD) according to IEC61000-4-2 up to ±12 kV, according to IEC61000-4-4 Electrical Fast Transient (EFT) up to ±4 kv. The SN65HVD7x full-duplex family provides internal biasing of receiver input thresholds, combined with Large input threshold hysteresis. Positive input threshold at VIT+ = –20 mV and input hysteresis at Vhys = 40 mV, receiver output remains logic high during bus idle or bus short conditions, even with the presence of 120 mVPP differential noise without external fault-protected biasing resistors. The device operates over a wide temperature range of –40°C to 125°C.

7. Application Information

The SN65HVD7x family consists of full-duplex RS-485 transceivers typically used for asynchronous data transmission. Full duplex implementation requires two signal pairs (quad wire) and allows each node Data is transmitted on one pair while receiving data on the other pair. To eliminate line reflections, each cable end is terminated with a terminating resistor R(T) whose value matches Characteristic impedance, Z0 , cable. This method, called parallel termination, allows higher data rate over longer cable lengths.

8. Device functional mode

For the SN65HVD70, SN65HVD73 and SN65HVD76, the differential outputs Y and Z follow the logic state at data input D when the driver enable pin DE is logic high. A logic high at D causes Y to go high and Z to go high and low. In this case, the differential output voltage, defined as VOD = V(Y) – V(Z), is positive. When D is low, the output state is inverted, Z goes high, Y goes low, and VOD is negative. When DE is low, both outputs go high impedance. In this case, the logic state at D is irrelevant. The DE pin has an internal pull-down resistor to ground, so when left open, the driver is disabled by default (high impedance). The D pin has an internal pull-up resistor to VCC, so output Y goes high and Z goes low when left open when the driver is enabled. The receiver is enabled when the receiver enable pin RE is logic low. The receiver output R goes high when the differential input voltage defined as VID = V(A) – V(B) is positive and above the positive input threshold VIT+. The receiver output R goes low when VID is negative and less than negative and below the negative input threshold VIT–. If VID is between VIT+ and VIT–, the output is undefined. When RE is logic high or open circuit, the receiver output is high impedance and the magnitude and polarity of VID does not matter. Internal biasing of the receiver input causes the output to go fail-safe high when the transceiver is disconnected from the bus (open), the bus line is shorted (shorted), or the bus is not actively driven (idle bus). For the SN65HVD71, HVD74 and HVD77, the driver and receiver are fully enabled, so the differential outputs Y and Z always follow the logic state of the data input D. A logic high at D causes Y to go high and Z to go low. In this case, the differential output voltage, defined as VOD = V(Y) – V(Z), is positive. When D is low, the output state is inverted, Z goes high, Y goes low, and VOD is negative. The D pin has an internal pull-up resistor to VCC, so output Y goes high and Z goes low when left open when the driver is enabled. For the SN65HVD71, HVD74 and HVD77, the drivers and receivers are fully enabled, so the differential outputs Y and Z always follow the logic state of the data input D. A logic high at D causes Y to go high and Z to go low. In this case, the differential output voltage, defined as VOD = V(Y) – V(Z), is positive. When D is low, the output state is inverted, Z goes high, Y goes low, and VOD is negative. The D pin has an internal pull-up resistor to VCC, so output Y goes high and Z goes low when left open when the driver is enabled.