FEATURES
· Qualified for Automotive Applications
· Drop-In Improved Replacement for the
PCA82C250 and PCA82C251
· Bus-Fault Protection of ±36 V
· Meets or Exceeds ISO 11898
· Signaling Rates(1) up to 1 Mbps
· High Input Impedance Allows up to 120
SN65HVD251 Nodes on a Bus
· Bus Pins ESD Protection Exceeds 9 kV (HBM)
· Unpowered Node Does Not Disturb the Bus
· Low-Current Standby Mode: 200 μA Typical
· Thermal Shutdown Protection
· Glitch-Free Power-Up and Power-Down Bus
Protection for Hot Plugging
· DeviceNet™ Vendor ID #806

APPLICATIONS
· CAN Data Buses
· Industrial Automation
– DeviceNet Data Buses
– Smart Distributed Systems (SDS™)
· SAE J1939 Standard Data Bus Interface
· NMEA 2000 Standard Data Bus Interface
· ISO 11783 Standard Data Bus Interface

DESCRIPTION
The SN65HVD251 is intended for use in applications
employing the Controller Area Network (CAN) serial
communication physical layer in accordance with the
ISO 11898 Standard. The SN65HVD251 provides differential transmit capability to the bus and
differential receive capability to a CAN controller at
speeds up to 1 megabit per second (Mbps).
Designed for operation in harsh environments, the
device features crosswire, overvoltage, and loss of
ground protection to ±36 V. Also featured are
overtemperature protection as well as –7-V to 12-V
common-mode range, and tolerance to transients of
±200 V. The transceiver interfaces the single-ended
CAN controller with the differential CAN bus found in
industrial, building automation, and automotive applications.
Rs, pin 8, selects one of three different modes of
operation: high-speed, slope control, or low-power
mode. The high-speed mode of operation is selected
by connecting pin 8 to ground, allowing the
transmitter output transistors to switch as fast as
possible with no limitation on the rise and fall slope.
The rise and fall slope can be adjusted by
connecting a resistor to ground at pin 8; the slope is
proportional to the pin's output current. Slope control
with an external resistor value of 10 kW gives
~15 V/μs slew rate; 100 kW gives ~2 V/μs slew rate.
If a high logic level is applied to the Rs pin 8, the
device enters a low-current standby mode where the
driver is switched off and the receiver remains active. The local protocol controller returns the device to the
normal mode when it transmits to the bus.