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LT1796 Datasheet(PDF) 5 Page - Linear Technology

Part No. LT1796
Description  Overvoltage Fault Protected CAN Transceiver
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1796 Datasheet(HTML) 5 Page - Linear Technology

   
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LT1796
1796f
PI FU CTIO S
TXD (Pin 1): Driver Input. Logic-level thresholds are set by
VREF. A logic input level higher than VREF turns the driver
outputs off, releasing control of the CANH and CANL lines.
A logic input less than VREF turns the driver outputs on,
pulling CANH high and CANL low. An open TXD input will
float high, turning the driver outputs off. The TXD input pin
can withstand voltages from – 0.3V to 44V with no dam-
age.
GND (Pin 2): Ground.
VCC (Pin 3): Positive Supply Input. Normal operation is
with a 4.75V to 5.25V supply. Operation with supplies up
to 44V is possible with unterminated bus lines. Operation
at high voltages with normally terminated busses will
result in excessive power dissipation and activation of the
thermal shutdown circuit. VCC should be decoupled with
a 0.1
µFlowESRcapacitorplacedasclosetothesupplypin
as possible.
RXD (Pin 4): Receiver TTL Level-Logic Output. A high level
output indicates a recessive state (zero-volt differential)
bus. A dominant state forces a low receiver output.
VREF (Pin 5): Reference Output. The reference voltage sets
the TXD input threshold and the recessive bus common
mode voltage at CANH and CANL. VREF is approximately
VCC/2 for low voltage operation. When VCC > 7.5V, VREF
maintains a 3.5V level.
CANL (Pin 6): CAN Bus Low Data Line. The CANL pin is one
input to the receiver and the low driver output. In the
dominant state (TXD low), the driver pulls the CANL pin to
within 1V of GND. In the recessive state (TXD high), the
driver output stays high impedance. The CANL pin is
protected from voltage faults from – 60V to 60V in domi-
nant, recessive, standby or powered off modes. On-chip
ESD protection meets IEC-1000-4-2 levels.
CANH (Pin 7): CAN Bus High Data Line. The CANH pin is
one input to the receiver and the high driver output. In the
dominant state (TXD low), the driver pulls the CANH pin to
within 1V of VCC. In the recessive state (TXD high), the
driver output stays high impedance. The CANH pin is
protected from voltage faults from – 60V to 60V in domi-
nant, recessive, standby or powered off modes. On-chip
ESD protection meets IEC-1000-4-2 levels.
RS (Pin 8): Slope Control. This pin is a multifunction
control pin. When RS is high (VRS > 4V), the circuit goes
into a low power standby mode. In standby, the driver
always stays in a high impedance (recessive) state. The
receiver operates in a low power (slow) monitoring mode.
Received data may be used to “wake-up” the system to full
functionality. Full speed normal operation occurs if RS is
tied low through a resistance of less than 3k. The current
out of RS will be limited to about 500µA in the low state.
Controlling the current out of RS with a resistor greater
than 3k or by using a current source allows slew rate
control of the data output onto CANH and CANL.
TYPICAL PERFOR A CE CHARACTERISTICS
Receiver Thresholds vs
Temperature
Receiver Propagation Delay vs
Temperature
TEMPERATURE (
°C)
–50
0.80
0.75
0.70
0.65
0.60
–25
0
25
50
1796 G10
75
100
VTH RISING
VTH FALLING
TEMPERATURE (
°C)
400
350
300
250
200
1796 G11
–50
–25
0
25
50
75
100
tRXDOFF
tRXDON


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