Datasheet
1
2
3
4
8
7
6
5
TXD
GND
V
CC
RXD
STB
CANH
CANL
SPLIT
SN65HVD1040
SN65HVD1040-Q1
SLLS753D –FEBRUARY 2007– REVISED AUGUST 2011
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
DESCRIPTION (CONTINUED)
Designed for operation in especially harsh environments, the SN65HVD1040 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.
STB (pin 8) provides two different modes of operation: high-speed mode or low-current standby mode. The
high-speed mode of operation is selected by connecting STB (pin 8) to ground.
If a high logic level is applied to the STB pin of the SN65HVD1040, the device enters a low-current standby
mode, while the receiver remains active in a low-power bus-monitor standby mode.
In the low-current standby mode, a dominant bit greater than 5 μs on the bus is passed by the bus-monitor circuit
to the receiver output. The local protocol controller may then reactivate the device when it needs to transmit to
the bus.
A dominant time-out circuit in the SN65HVD1040 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.
SPLIT (pin 5) is available as a V
CC
/2 common-mode bus voltage bias for a split-termination network (see
application information).
The SN65HVD1040 is characterized for operation from –40°C to 125°C.
ORDERING INFORMATION
(1)
MARKED
PART NUMBER PACKAGE
(2)
ORDERING NUMBER
AS
SN65HVD1040-Q1 SOIC-8 H1040Q SN65HVD1040QDRQ1 (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 SN65HVD1040 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 can take the bus voltages outside the absolute maximum ratings of the device, possibly leading
to damage.
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