1 Features
• 1/8 Unit-load option available
(up to 256 nodes on the bus)
• Bus-pin ESD protection exceeds 15-kV HBM
• Optional driver output transition times for signaling
rates of 1 Mbps, 5 Mbps and 26 Mbps
– Line signaling rate is the number of voltage
transitions made per second expressed in units
of bps (bits per second)
• Low-current standby mode: <1 μA
• Glitch-free power-up and power-down protection
for hot-plugging applications
• 5-V Tolerant inputs
• Bus idle, open, and short-circuit failsafe
• Driver current limiting and thermal shutdown
• Designed for RS-422 and RS-485 networks
• 5-V Devices available, SN65HVD50-55

2 Applications
• Utility meters
• DTE and DCE interfaces
• Industrial, process, and building automation
• Point-of-sale (POS) pins and networks

3 Description
The SN65HVD3x devices are 3-state differential
line drivers and differential-input line receivers that
operate with 3.3-V power supply.
Each driver and receiver has separate input and
output pins for full-duplex bus communication
designs. They are designed for RS-422 and RS-485
data transmission over cable lengths of up to
1500 meters.
The SN65HVD30, SN65HVD31, and SN65HVD32
devices are fully enabled with no external enabling
pins.
The SN65HVD33, SN65HVD34, and SN65HVD35
devices have active-high driver enables and activelow
receiver enables. A low, less than 1 μA, standby
current can be achieved by disabling both the driver
and receiver.
All devices are characterized for ambient
temperatures from –40°C to 85°C. Low power
dissipation allows operation at temperatures up to
105°C or 125°C, depending on package option.