1 Features
1• 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 Nodes on
a Bus
• Bus Pin ESD Protection Exceeds 14 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 CAN Bus
Protection for Hot-Plugging
• DeviceNet Vendor ID #806
(1) The signaling rate of a line is the number of voltage
transitions that are made per second expressed in bps (bits
per second).

2 Applications
• CAN Data Buses
• Industrial Automation
• SAE J1939 Standard Data Bus Interface
• NMEA 2000 Standard Data Bus Interface

3 Description
The HVD251 is intended for use in applications
employing the Controller Area Network (CAN) serial
communication physical layer in accordance with the
ISO 11898 Standard. The HVD251 provides
differential transmit capability to the bus and
differential receive capability to a CAN controller at
speeds up to 1 megabits per second (Mbps).
Designed for operation in harsh environments, the
device features cross-wire, 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 kΩ gives about 15-V / μs
slew rate; 100 kΩ gives about 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.