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.