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PDF LTC2875 Data sheet ( Hoja de datos )
| Número de pieza | LTC2875 | |
| Descripción | High Speed CAN Transceiver | |
| Fabricantes | Linear | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC2875 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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Features
LTC2875
±60V Fault Protected
3.3V or 5V 25kV ESD
High Speed CAN Transceiver
Description
n Protected from Overvoltage Line Faults to ±60V
n 3.3V or 5V Supply Voltage
n High Speed Operation Up to 4Mbps
n ±25kV ESD Interface Pins, ±8kV All Other Pins
n Variable Slew Rate Driver with Active Symmetry
Control and SPLIT Pin for Low Electromagnetic
Emission (EME)
n Extended Common Mode Range (±36V)
n Ideal Passive Behavior to CAN Bus with Supply Off
n Current Limited Drivers and Thermal Shutdown
n Power-Up/Down Glitch-Free Driver Outputs
n Micropower Shutdown Mode
n Transmit Data (TXD) Dominant Timeout Function
n ISO 11898-2 Compliant
n DeviceNet Compatible
n Up to MP-Grade Available (–55°C to 125°C)
n 3mm × 3mm 8-Lead DFN and SO-8 Packages
Applications
n Industrial Control and Instrumentation Networks
n Automotive and Transportation Electronics
n Building Automation, Security Systems, HVAC
n Medical Equipment
The LTC®2875 is a robust high speed, low power CAN
transceiver operating on 3.3V or 5V supplies that features
±60V overvoltage fault protection on the data transmission
lines during all modes of operation, including power-down.
The maximum data rate has been extended to 4Mbps to
support high speed protocols based on the CAN physi-
cal layer. Enhanced ESD protection allows these parts to
withstand ±25kV HBM on the transceiver interface pins
without latchup or damage.
Extended ±36V input common mode range and high com-
mon mode rejection on the CAN receiver provides tolerance
of large ground loop voltages. A sophisticated CAN driver
with active symmetry control maintains tight control of
the common mode voltage for excellent electromagnetic
emission, while the variable slew rate and split termination
support allow additional EME reduction.
L, LT, LTC, LTM, Linear Technology, µModule and the Linear logo are registered trademarks
and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
CAN Bus Link with Large Ground Loop Voltage
RXD1
LTC2875
R
VCC1
CANH
120Ω
VCC2
CANH
120Ω
LTC2875
R
TXD1
RS1
D
CANL
CANL
GND1 AC GROUND
LOOP ≤ 36V
PEAK
GND2
D
RXD2
TXD2
RS2
2875 TA01a
LTC2875 Transmitting at 4Mbps
from a 3.3V Supply
TXD
2V/DIV
RXD
2V/DIV
CANH
1V/DIV
CANL
1V/DIV
COMMON MODE
100ns/DIV
2875 TA01b
For more information www.linear.com/LTC2875
2875f
1
1 page  
LTC2875
S WITCHING Characteristics The l denotes the specifications which apply over the full operating
t0eΩm,pReSra=tu0reV,raTnYgPev,aoltuheesrwatisVeCCsp=e5ciVfiucantlieosnssoathreerawt iTsAe=no2t5e°dC..(VNCoCte=23).3V or 5V, Figure 1 applies with RL = 60Ω, CL = 100pF, RSL =
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Transceiver Timing
fMAX Maximum Data Rate
l4
tPTXBD
TXD to Bus Dominant Propagation Delay
(Figures 2, 3)
VCC = 3.3V
l
45
VCC = 5V
l 45
tPTXBR
TXD to Bus Recessive Propagation Delay
(Figures 2, 3)
VCC = 3.3V
l
80
VCC = 5V
l 60
tPTXBDS
TXD to Bus Dominant Propagation Delay,
Slow Slew
RSL=200kΩ
(Figures 2, 3)
VCC = 3.3V l 200
VCC = 5V
l 220
tPTXBRS
TXD to Bus Recessive Propagation Delay,
Slow Slew
RSL=200kΩ
(Figures 2, 3)
VCC = 3.3V l 400
VCC = 5V
l 480
tPBDRX
Bus Dominant to RXD Propagation Delay
(Figures 2, 3)
l 25
tPBRRX
Bus Recessive to RXD Propagation Delay
(Figures 2, 3)
l 25
tPTXRXD TXD to RXD Dominant Propagation Delay
(Figures 2, 3)
VCC = 3.3V
l
80
VCC = 5V
l 75
tPTXRXR TXD to RXD Recessive Propagation Delay
(Figures 2, 3)
VCC = 3.3V l 115
VCC = 5V
l 95
tPTXRXDS TXD to RXD Dominant Propagation Delay,
Slow Slew
RSL = 200kΩ
(Figures 2, 3)
VCC = 3.3V l 190
VCC = 5V
l 210
tPTXRXRS TXD to RXD Recessive Propagation Delay,
Slow Slew
RSL = 200kΩ
(Figures 2, 3)
VCC = 3.3V l 420
VCC = 5V
l 480
tTOTXD
TXD Timeout Time
(Figures 2, 4)
l 0.5
tENRX
RXD Enable from Shutdown
(Figure 5)
l
tENTX
TXD Enable from Shutdown
(Figures 2, 6) (Note 5)
l
tSHDNRX Time to Shutdown, RXD
(Figure 5)
l
tSHDNTX Time to Shutdown, TXD
(Figures 2, 6)
l
Transmitter Drive Symmetry (Common Mode Voltage Fluctuation)
80 130
75 115
120 170
90 120
540 1220
560 1200
960 2010
1040 2240
40 65
45 80
120 180
115 165
165 215
135 185
500 1110
530 1090
940 1910
1020 2110
24
40
40
250
250
Mbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
µs
µs
ns
ns
VSYM
Driver Symmetry (CANH + CANL
(Dynamic Peak Measurement)
–
2VO(R))
RL = 60Ω/Tol. <
4.7nF/5%, fTXD
=1%25, 0CkSHPzL,ITIn=put
Impedance of Oscilloscope: ≤ 20pF/
≥ 1MΩ (Figure 2)
l
±500 mV
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 3: Not tested in production.
Note 4: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature exceeds 150°C when overtemperature protection is active.
Continuous operation above the specified maximum operating temperature
may result in device degradation or failure.
Note 5: TXD must make a high to low transition after this time to assert a
bus dominant state.
Note 6: Pin capacitance given for reference only and is not tested in
production.
For more information www.linear.com/LTC2875
2875f
5
5 Page 
Block Diagram
VCC
1 TXD
500k
VCC
8 RS
250k
VCC
4 RXD
500k
TXD
TIMEOUT
SLEW
CONTROL
SLEW
SHUTDOWN/
SLEW
SHUTDOWN
RX
PREDRIVE
3
VCC
VCC
40k CANH* 7
40k CANL* 6
5 SPLIT*
VCC
++
––
1.4k
1.4k
*±60V TOLERANT, ±25kV HBM PROTECTED PINS
GND
2
2875 BD
LTC2875
Figure 7. LTC2875 Simplified Block Diagram
For more information www.linear.com/LTC2875
2875f
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC2875.PDF ] | |
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