MAX13051ASA-T Maxim Integrated Products, MAX13051ASA-T Datasheet - Page 12

• Manufacturer Part Number: MAX13051ASA-T
• Description: Network Controller & Processor ICs
• Manufacturer: Maxim Integrated Products

Specifications of MAX13051ASA-T

• Product: Controller Area Network (CAN)
• Number Of Transceivers: 1
• Data Rate: 1 Mbps
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 4.75 V
• Supply Current (max): 72 mA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

disabling thermal shutdown once the temperature
drops below +152°C. In thermal shutdown, CANH and
CANL go recessive. After a thermal-shutdown event,
the IC resumes normal operation when the junction
temperature drops below the thermal-shutdown hys-
teresis, and upon the CAN transceiver detecting a ris-
ing edge at TXD.
In slope-control mode, the MAX13052’s CANH and CANL
outputs are slew-rate limited, minimizing EMI and reduc-
ing reflections caused by improperly terminated cables.
In multidrop CAN applications, it is important to main-
tain a direct point-to-point wiring scheme. A single pair
of wires should connect each element of the CAN bus,
and the two ends of the bus should be terminated with
120Ω resistors, see Figure 4. A star configuration
should never be used.
Any deviation from the point-to-point wiring scheme
creates a stub. The high-speed edge of the CAN data
on a stub can create reflections back down the bus.
These reflections can cause data errors by eroding the
noise margin of the system.
Although stubs are unavoidable in a multidrop system,
care should be taken to keep these stubs as small as
possible, especially in high-speed mode. In slope-con-
trol mode, the requirements are not as rigorous, but
stub length should still be minimized.
CANH and CANL are differential signals and steps
should be taken to insure equivalent parasitic capaci-
Industry-Standard High-Speed CAN
Transceivers with ±80V Fault Protection
Figure 4. Multiple Receivers Connected to CAN Bus
12
______________________________________________________________________________________
RXD
TXD
MAX13052
Applications Information
Reduced EMI and Reflections
CANH
SPLIT
CANL
R
R
L
L
= 60Ω
= 60Ω
Layout Consideration
TWISTED PAIR
KEEP AS SHORT
TRANSCEIVER 1
STUB LENGTH
AS POSSIBLE
Figure 5. IEC 61000-4-2 Contact Discharge ESD Test Model
Figure 6. IEC 61000-4-2 ESD Test Model Current Waveform
VOLTAGE
SOURCE
HIGH-
t r = 0.7ns to 1ns
DC
CHARGE-CURRENT-
LIMIT RESISTOR
100%
50MΩ to 100MΩ
90%
10%
I
R
TRANSCEIVER 2
150pF
C
C s
30ns
R
STORAGE
CAPACITOR
L
330kΩ
RESISTANCE
= 120Ω
DISCHARGE
R
D
60ns
TRANSCEIVER 3
DEVICE
UNDER
TEST
t