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PDF ISL72027SEH Data sheet ( Hoja de datos )
| Número de pieza | ISL72027SEH | |
| Descripción | 3.3V Radiation Tolerant CAN Transceiver | |
| Fabricantes | Intersil Corporation | |
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DATASHEET
3.3V Radiation Tolerant CAN Transceiver, with Listen
Mode and Split Termination Output
ISL72027SEH
The Intersil ISL72027SEH is a 3.3V radiation tolerant CAN
transceiver that is compatible with the ISO11898-2 standard
for applications calling for Controller Area Network (CAN) serial
communication in satellites and aerospace communications
and telemetry data processing in harsh industrial
environments.
The transceiver can transmit and receive at bus speeds up to
5Mbps. It can drive a 40m cable at 1Mbps per the ISO11898-2
specification. The device is designed to operate over a
common-mode range of -7V to +12V with a maximum of 120
nodes. The device has three discrete selectable driver rise/fall
time options, a listen mode feature and a split termination
output.
Receiver (Rx) inputs feature a “full fail-safe” design, which
ensures a logic high Rx output if the Rx inputs are floating,
shorted, or terminated but undriven.
The ISL72027SEH is available in an 8 Ld hermetic ceramic
flatpack and die form that operate across the temperature
range of the -55°C to +125°C. The logic inputs are tolerant
with 5V systems.
Other CAN transceivers available are the ISL72026SEH and
ISL72028SEH. For a list of differences see Table 1 on page 2.
Related Literature
• UG051, “ISL7202xSEHEVAL1Z Evaluation Board User Guide”
• TR018, “SEE Testing of the ISL72027SEH CAN Transceiver”
• TR022, “Total Dose Testing of the ISL72026SEH,
ISL72027SEH and ISL72028SEH CAN Transceivers”
Features
• DLA SMD 5962-15228
• ESD Protection on all pins. . . . . . . . . . . . . . . . . . . . . . 4kV HBM
• Compatible with ISO11898-2
• Operating supply range . . . . . . . . . . . . . . . . . . . . . 3.0V to 3.6V
• Bus pin fault protection to ±20V
• Undervoltage lockout
• Cold spare: powered down devices/nodes will not affect
active devices operating in parallel
• Three selectable driver rise and fall times
• Glitch free bus I/O during power-up and power-down
• Full fail-safe (open, short, terminated/undriven) receiver
• Hi Z input allows for 120 nodes on the bus
• High data rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . up to 5Mbps
• Quiescent supply current . . . . . . . . . . . . . . . . . . . . 7mA (max)
• Listen mode supply current . . . . . . . . . . . . . . . . . . 2mA (max)
• -7V to +12V common-mode input voltage range
• 5V tolerant logic inputs
• Thermal shutdown
• Acceptance tested to 75krad(Si) (LDR) wafer-by-wafer
• Radiation tolerance
- SEL/B immune to LET 60MeV•cm2/mg
- Low dose rate (0.01rad(Si)/s) . . . . . . . . . . . . . . 75krad(Si)
Applications
• Satellites and aerospace communications
• Telemetry data processing
• High-end industrial environments
• Harsh environments
Tx DATA IN
VCC
0.1µF
1D
RS 8
2 GND
CANH 7
ISL72027SEH
3 VCC
CANL 6
4R
VREF 5
Rx DATA OUT
FIGURE 1. TYPICAL APPLICATION
August 16, 2016
FN8763.3
1
CANH
CANL
D
4
0R
4
0
3 RS = GND, RDIFF = 60Ω
2
1 CANH - CANL
0
TIME (1µs/DIV)
FIGURE 2. FAST DRIVER AND RECEIVER WAVEFORMS
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2015, 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL72027SEH
Absolute Maximum Ratings
VCC to GND with/without Ion Beam. . . . . . . . . . . . . . . . . . . . . -0.3V to 5.5V
CANH, CANL, VREF Under Ion Beam . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18V
CANH, CANL, VREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20V
I/O Voltages
D, R, RS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
Receiver Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10mA to 10mA
Output Short-circuit Duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating:
Human Body Model (Tested per MIL-PRF-883 3015.7)
CANH, CANL Bus Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4kV
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4kV
Charged Device Model (Tested per JESD22-C101D) . . . . . . . . . . . . . . 750V
Machine Model (Tested per JESD22-A115-A) . . . . . . . . . . . . . . . . . . . . 200V
Thermal Information
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
8 Ld FP Package (Notes 3, 4) Direct Attach .
39
7
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+175°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Recommended Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-55°C to +125°C
VCC Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3V to 3.6V
Voltage on CAN I/O. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7V to 12V
VIH D Logic Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 5.5V
VIL D Logic Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to 0.8V
IOH Driver (CANH - CANL = 1.5V, VCC = 3.3V) . . . . . . . . . . . . . . . . . . - 40mA
IOH Receiver (VOH = 2.4V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -4mA
IOL Driver (CANH - CANL = 1.5V, VCC = 3.3V) . . . . . . . . . . . . . . . . . . +40mA
IOL Receiver (VOL = 0.4V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4mA
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
3. JA is measured with the component mounted on a high effective thermal conductivity test board (two buried 1oz copper planes) with “direct attach”
features package base mounted to PCB thermal land with a 10 mil gap fill material having a k of 1W/m-K. See Tech Brief TB379.
4. For JC, the “case temp” location is the center of the package underside.
Electrical Specifications Test Conditions: VCC = 3V to 3.6V; Typicals are at TA = +25°C (Note 7); unless otherwise specified (Note 5).
Boldface limits apply across the operating temperature range, -55°C to +125°C or across a total ionizing dose of 75krad(Si) at +25°C with exposure at
a low dose rate of <10mrad(Si)/s.
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP MIN TYP MAX
(°C) (Note 6) (Note 7) (Note 6)
UNIT
DRIVER ELECTRICAL CHARACTERISTICS
Dominant Bus Output Voltage VO(DOM)
D = 0V, CANH, RS = 0V,
Figures 10 and 11
3V VCC 3.6V
Full 2.25
2.85
VCC
V
D = 0V, CANL, RS = 0V,
Figures 10 and 11
Full 0.10
0.65
1.25
V
Recessive Bus Output Voltage VO(REC)
D = 3V, CANH, RS = 0V, 60Ω 3V VCC 3.6V
and no load, Figures 10 and
11
Full 1.80
2.30
2.70
V
D = 3V, CANL, RS = 0V, 60Ω
and no load, Figures 10 and
11
Full 1.80
2.30
2.80
V
Dominant Output Differential VOD(DOM) D = 0V, RS = 0V, 3V VCC 3.6V, Figures 10 and 11 Full
1.5
2.2
3.0
V
Voltage
D = 0V, RS = 0V, 3V VCC 3.6V, Figures 11 and 12 Full
1.2
2.1
3.0
V
Recessive Output Differential VOD(REC)
Voltage
D = 3V, RS = 0V, 3V VCC 3.6V, Figures 10 and 11 Full
D = 3V, RS = 0V, 3.0V VCC 3.6V, no load
Full
-120
-500
0.2
-34
12 mV
50 mV
Logic Input High Voltage (D) VIH
3V VCC 3.6V, Note 8
Full 2.0 - 5.5 V
Logic Input Low Voltage (D)
VIL
3V VCC 3.6V, Note 8
Full 0
- 0.8 V
High Level Input Current (D) IIH
D = 2V, 3V VCC 3.6V
Full -30
-3
30 µA
Low Level Input Current (D)
IIL
D = 0.8V, 3V VCC 3.6V
Full -30
-7
30 µA
RS Input Voltage for Listen
Mode
VIN(RS)
3V VCC 3.6V
Full 0.75xVCC 1.90
5.5
V
Submit Document Feedback
5
FN8763.3
August 16, 2016
5 Page 
ISL72027SEH
Functional Description
Overview
The Intersil ISL72027SEH is a 3.3V radiation tolerant CAN
transceiver that is compatible with the ISO11898-2 standard for
use in CAN (Controller Area Network) serial communication
systems.
The device performs transmit and receive functions between the
CAN controller and the CAN differential bus. It can transmit and
receive at bus speeds of up to 5Mbps. It is designed to operate
over a common-mode range of -7V to +12V with a maximum of
120 nodes. The device is capable of withstanding ±20V on the
CANH and CANL bus pins outside of ion beam and ±16V under
ion beam.
Slope Adjustment
The output driver rise and fall time has three distinct selections
that may be chosen by using a resistor from the RS pin to GND.
Connecting the RS pin directly to GND results in output switching
times that are the fastest, limited only by the drive capability of
the output stage. RS = 10kΩ provides for a typical slew rate of
8V/µs and RS = 50kΩ provides for a typical slew rate of 4V/µs.
Putting a high logic level to the RS pin places the device in a low
current listen mode. The protocol controller uses this mode to
switch between low power listen mode and a normal transmit
mode.
Cable Length
The device can work per ISO11898 specification with a 40m
cable and stub length of 0.3m and 60 nodes at 1Mbps. This is
greater than the ISO requirement of 30 nodes. The cable type
specified is a twisted pair (shielded or unshielded) with a
characteristic impedance of 120Ω. Resistors equal to this are to
be terminated at both ends of the cable. Stubs should be kept as
short as possible to prevent reflections.
Cold Spare
High reliability system designers implementing data
communications have to be sensitive to the potential for single
point failures. To mitigate the risk of a failure they will use
redundant bus transceivers in parallel. Space systems call for
high reliability in data communications that are resistant to
single point failures. This is achieved by using a redundant bus
transceiver in parallel. In this arrangement, both active and
quiescent devices can be present simultaneously on the bus. The
quiescent devices are powered down for cold spare and do not
affect the communication of the other active nodes.
To achieve this, a powered down transceiver (VCC < 200mV) has
a resistance between the VREF pin or the CANH pin or CANL pin
and the VCC supply rail of >480kΩ (max) with a typical resistance
>2MΩ. The resistance between CANH and CANL of a powered
down transceiver has a typical resistance of 80kΩ.
Listen Mode
When a high level is applied to the RS pin, the device enters a low
power listen mode. The driver of the transceiver is switched off to
conserve power while the receiver remains active. In listen mode
the transceiver draws 2mA (max) of current.
A low level on the RS pin brings the device back to normal
operation.
Using 3.3V Devices in 5V Systems
Looking at the differential voltage of both the 3.3V and 5V
devices, the differential voltage is the same, the recessive
common-mode output is the same. The dominant
common-mode output voltage is slightly lower than the 5V
counterparts. The receiver specs are also the same. Though the
electrical parameters appear compatible, it is advised that
necessary system testing be performed to verify interchangeable
operation.
Split Mode Termination
The VREF pin provides a VCC/2 output voltage for split mode
termination. The VREF pin has the same ESD protection,
short-circuit protection, and common-mode operating range as
the bus pins.
The split mode termination technique is shown in Figure 19.
VREF
NODE
#1
60Ω
CL 60Ω
NODE
#2
CANH
CANL
NODE
#n
VREF
60Ω
60Ω CL
FIGURE 19. SPLIT TERMINATION
It is used to stabilize the bus voltage at VCC/2 and prevent it from
drifting to a high common-mode voltage during periods of
inactivity. The technique improves the electromagnetic
compatibility of a network. The split mode termination is put at
each end of the bus.
The CL capacitor between the two 60Ω resistors filters unwanted
high frequency noise to ground. The resistors should have a
tolerance of 1% or better and the two resistors should be
carefully matched to provide the most effective EMI immunity. A
typical value of CL for a high speed CAN network is 4.7nF, which
generates a 3dB point at 1.1Mbps. The capacitance value used is
dependent on the signaling rate of the network.
Submit Document Feedback 11
FN8763.3
August 16, 2016
11 Page | ||
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| PDF Descargar | [ Datasheet ISL72027SEH.PDF ] | |
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