Datasheet

1
2
3
4
8
7
6
5
TXD
GND
V
CC
RXD
S
CANH
CANL
V
ref
SN65HVD1050
SN65HVD1050-Q1
SLLS696C –MAY 2006–REVISED DECEMBER 2010 www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DESCRIPTION (CONTINUED)
Designed for operation is especially harsh environments, the SN65HVD1050 features cross-wire, over-voltage,
and loss of ground protection from –27 V to 40 V, over-temperature protection, a –12-V to 12-V common-mode
range, and withstands voltage transients from –200 V to 200 V according to ISO 7637.
Pin 8 provides for two different modes of operation: high-speed or silent mode. The high-speed mode of
operation is selected by connecting S (pin 8) to ground.
If a high logic level is applied to the S pin of the SN65HVD1050, the device enters a listen-only silent mode
during which the driver is switched off while the receiver remains fully functional.
In silent mode, all bus activity is passed by the receiver output to the local protocol controller. When data
transmission is required, the local protocol controller reverses this low-current silent mode by placing a logic low
on the S pin to resume full operation.
A dominant time-out circuit in the SN65HVD1050 prevents the driver from blocking network communication with
a hardware or software failure. The time-out circuit is triggered by a falling edge on TXD (pin 1). If no rising edge
is seen before the time-out constant of the circuit expires, the driver is disabled. The circuit is then reset by the
next rising edge on TXD.
V
ref
(pin 5) is available as a V
CC
/2 voltage reference.
The SN65HVD1050 is characterized for operation from –40°C to 125°C.
ORDERING INFORMATION
(1)
MARKED
PART NUMBER PACKAGE
(2)
ORDERING NUMBER
AS
SN65HVD1050-Q1 SOIC-8 H1050Q SN65HVD1050QDRQ1 (reel)
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
Application Hint: CAN Nodes Using Common-Mode Chokes
The SN65HVD1050 has been EMC optimized to allow use in CAN systems without a common-mode choke.
However, sometimes the CAN network and termination architecture may require their use. If a common-mode
choke is used in a CAN node where bus-line shorts to dc voltages may be possible, care should be taken in the
choice of common-mode choke (winding type, core type, and value) along with the termination and protection
scheme of the node and bus. During CAN bus shorts to dc voltages the inductance of the common-mode choke
may cause inductive flyback transients. Some combinations of common-mode chokes, bus termination, and
shorting voltages take the bus voltages outside the absolute maximum ratings of the device, possibly leading to
damage.
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