MAX33042ESHLD [MAXIM]
Easy Evaluation of the MAX33042E;
| 型号： | MAX33042ESHLD |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Easy Evaluation of the MAX33042E |
| 文件： | 总15页 (文件大小：474K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
General Description
Benefits and Features
The MAX33042E is a +5V CAN transceiver with
integrated protection for industrial applications. This
device has extended ±40V fault protection for equipment
where overvoltage protection is required. It also
incorporates high ±40kV ESD Human Body Model
(HBM) protection and an input common-mode range
(CMR) of ±25V, exceeding the ISO 11898-2 CAN
standard of -2V to +7V. This makes it well suited for
applications where there is moderate electrical noise
that can influence the ground levels between two nodes
or systems.
•
Integrated Protection Increases Robustness
•
Increased Protection on CANH and CANL
▪
▪
▪
±40V Fault Tolerant
±40kV ESD HBM Protection
±12kV Contact and ±15kV Air-Gap ESD
(ISO 10605, IEC 61000-4-2) Protection
±25V Extended Common-Mode Input
Range (CMR)
▪
▪
Short-Circuit Protection
•
•
Transmitter-Dominant Timeout Prevents
Lockup
Thermal Shutdown
This device operates at a high-speed CAN data rate,
allowing up to 4Mbps on short distance networks.
Maximum speed on large networks may be limited by
the number of nodes, the type of cabling used, stub
length, and other factors. The MAX33042E includes a
dominant timeout to prevent bus lockup caused by
controller error or by a fault on the TXD input. When the
TXD remains in the dominant state (low) for longer than
tDOM, the driver is switched to the recessive state,
releasing the bus and allowing other nodes to
communicate.
•
•
Provides Flexible Design Options
•
•
•
Slow Slew Rate to Minimize EMI
Low-Current Standby Mode
Shutdown Pin to Save Power
Small Package Option to Save PCB Area
•
8-Pin SOT23
•
•
High-Speed Operation of up to 4Mbps
Operating Temperature Range of -40°C to +125°C
Ordering Information appears at end of data sheet.
The transceiver features a STBY pin for three modes of
operation; standby mode for low current consumption,
normal high-speed mode, or a slow slew rate mode
when an external 26.1kΩ resistor is connected between
ground and the STBY pin. A shutdown pin enables the
device to further save power consumption where the
transmitter and receiver are turned off.
The MAX33042E is available in 8-pin SOT23 and
8-pin SOIC packages. Both packages operate over the
-40°C to +125°C temperature range.
Applications
•
•
•
•
Industrial Equipment
Instrumentation
Motor Control
Building Automation
www.maximintegrated.com
19-100965; Rev 0; 1/21
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
Simplified Block Diagram
VDD
MAX33042E
THERMAL
SHUTDOWN
DOMINANT
TIMEOUT
TXD
PROTECTION
PROTECTION
CANH
CANL
DRIVER
SHDN
WAKE-UP MODE
CONTROL
STBY
WAKE-UP
FILTER
RXD
GND
www.maximintegrated.com
Maxim Integrated | 2
19-100965; Rev 0; 1/21
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
Absolute Maximum Ratings
VDD...................................................................... -0.3V to +6.0V
CANH or CANL (Continuous) .............................. -40V to +40V
TXD, STBY, SHDN ............................................ -0.3V to +6.0V
RXD.................................................................... -0.3V to +6.0V
Short-Circuit Duration.............................................. Continuous
Continuous Power Dissipation (SOT23)
Continuous Power Dissipation (SOIC)
__Multilayer Board (TA = +70°C, derate 7.4mW/°C above
+70°C)........................................................................ 588.2mW
__Operating Temperature Range................... -40°C to +125°C
__Junction Temperature................................................+150°C
__Storage Temperature Range...................... -60°C to +150°C
__Soldering Temperature (reflow).................................+260°C
__Lead Temperature (soldering, 10s)...........................+300°C
__Multilayer Board (TA = +70°C, derate 9.5mW/°C above
+70°C)........................................................................761.9mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or
any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
8 SOT23
Package Code
K8CN+2C
21-0078
90-0176
Outline Number
Land Pattern Number
Thermal Resistance, Four-Layer Board
Junction to Ambient (θJA)
Junction to Case (θJC)
105°C/W
42.3°C/W
8 SOIC
Package Code
S8+2C
Outline Number
21-0041
90-0096
Land Pattern Number
Thermal Resistance, Four-Layer Board
Junction to Ambient (θJA)
Junction to Case (θJC)
136°C/W
38°C/W
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix
character, but the drawing pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-
tutorial.
www.maximintegrated.com
Maxim Integrated | 3
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
Electrical Characteristics
(V
= 4.5V to 5.5V, R = 60Ω, C = 100pF, C = 15pF, T = T
to T
, unless otherwise specified. Typical values are at V
MAX DD
DD
LD
LD
L
A
MIN
= 5.0V and T = +25°C, unless otherwise specified.) (Note 1)
A
PARAMETER
POWER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
V
4.5
5.5
9
V
DD
No load
= 60Ω
5
50
3
Dominant Supply
Current
TXD = SHDN =
STBY = 0V
I
mA
DD_DOM
R
70
LD
No load
V
= TXD = 5.0V,
DD
Recessive Supply
Current
I
STBY = SHDN =
0V
mA
DD_REC
CANH shorted to
CANL
3
Shutdown Current
I
SHDN = STBY = TXD = V
0.03
45
3
μA
μA
V
SHDN
DD
Standby Supply Current
UVLO Threshold Rising
UVLO Threshold Falling
FAULT PROTECTION
I
STBY = TXD = V
70
STBY
DD
V
V
V
rising
falling
4.25
UVLO_R
DD
DD
V
3.45
V
UVLO_F
HBM, JEDEC JS-001-2017
±40
±15
±12
ESD Protection (CANH,
CANL to GND)
Air-Gap ISO 10605, IEC 61000-4-2
Contact ISO 10605, IEC 61000-4-2
kV
kV
ESD Protection (All
Other Pins)
HBM
±4
Fault Protection Range
Thermal Shutdown
V
CANH or CANL to GND
-40
+40
V
FP
T
+160
+20
°C
SHDN
Thermal Shutdown
Hysteresis
T
°C
HYST
LOGIC INTERFACE (RXD, TXD, STBY, SHDN)
0.7 x
Input High Voltage
Input Low Voltage
V
V
V
IH
V
DD
V
TXD, SHDN
0.8
IL
PU_TXD
TXD Input Pullup
Resistance
STBY Input Pullup
Resistance
Slow Slew Rate
Resistor
R
100
100
250
kΩ
R
250
kΩ
kΩ
PU_STBY
SLEW_ON
External resistor size from STBY to
ground to enable slow slew rate mode
R
26.1
SHDN Input Pulldown
Resistance
R
1
MΩ
PD_SHDN
V
0.4V
-
DD
Output High Voltage
V
Sourcing 4mA, TXD = V
Sinking 4mA, TXD = 0V
V
V
OH
DD
Output Low Voltage
V
0.4
OL
CAN BUS DRIVER
CANH
CANL
CANH
2.75
0.5
2
4.5
2.25
3
Bus Output Voltage
(Dominant)
V
t < t , TXD = 0V
DOM
V
V
O_DOM
V
O_REC
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Maxim Integrated | 4
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
(V
= 4.5V to 5.5V, R = 60Ω, C = 100pF, C = 15pF, T = T
to T
, unless otherwise specified. Typical values are at V
MAX DD
DD
LD
LD
L
A
MIN
= 5.0V and T = +25°C, unless otherwise specified.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Bus Output Voltage
(Recessive)
TXD = V
no load
,
DD
CANL
2
3
R
= 156Ω,
CM
-5V ≤ V
Figure 1
≤ +10V,
1.5
3
Bus Output Differential
Voltage (Dominant)
CM
V
V
TXD = 0V
V
OD_DOM
R
= open
1.5
70
3
160
+12
+50
5
CM
Output Voltage Standby
V
TXD = STBY = V , no load
mV
mV
O_STBY
OD_REC
SC_CANH
DD
R
= 60Ω
LD
-120
-500
Bus Output Differential
Voltage (Recessive)
TXD = V
DD
No load
I
TXD = 0V, CANH = -40V
TXD = 0V, CANL = +40V
2
2
Short-Circuit Current
mA
I
5
SC_CANL
RECEIVER
Common-Mode Input
Range
CANH or CANL to GND, RXD output
valid
CANH or CANL to GND, RXD output
valid
V
-25
-12
+25
+12
0.9
V
V
V
V
CM
Common-Mode Input
Range Standby Mode
Input Differential
Voltage (Dominant)
Input Differential
Voltage (Recessive)
Standby Input
V
CM_STBY
V
-25V ≤ V
-25V ≤ V
≤ +25V, TXD = V
≤ +25V, TXD = V
ID_DOM
CM
CM
DD
DD
V
0.5
ID_REC
Differential Voltage
(Dominant)
Standby Input
Differential Voltage
(Recessive)
Input Differential
Hysteresis
V
-12V ≤ V
≤ +12V, TXD = V
1.15
V
V
ID_STBYDOM
CM
CM
DD
DD
V
-12V ≤ V
-25V ≤ V
≤ +12V, TXD = V
≤ +25V
0.45
ID_STBYREC
V
90
mV
kΩ
kΩ
pF
pF
μA
ID_HYS
CM
DD
DD
DD
DD
Input Resistance
R
TXD = V
TXD = V
TXD = V
TXD = V
10
20
50
100
35
IN
Differential Input
Resistance
R
C
IN_DIFF
Input Capacitance
C
(Note 2)
(Note 2)
18
9
IN
Differential Input
Capacitance
18
IN_DIFF
Input Leakage Current
I
V
= 0V, CANH = CANL = 5.0V
DD
150
250
LKG
SWITCHING
V
= 0V
5
STBY
R
= open,
CM
Driver Rise Time
Driver Fall Time
t
ns
ns
R
26.1kΩ resistor
from STBY to GND
Figure 1
40
10
80
V
= 0V
STBY
R
= open,
CM
t
F
26.1kΩ resistor
from STBY to GND
Figure 1
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Maxim Integrated | 5
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
(V
= 4.5V to 5.5V, R = 60Ω, C = 100pF, C = 15pF, T = T
to T
, unless otherwise specified. Typical values are at V
MAX DD
DD
LD
LD
L
A
MIN
= 5.0V and T = +25°C, unless otherwise specified.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Dominant to
Recessive,
60
100
Figure 2
TXD to RXD Loop Delay
t
STBY = 0V
ns
LOOP
Recessive to
Dominant, Figure 2
60
25
100
50
TXD Propagation Delay
(Recessive to
Dominant)
TXD Propagation Delay
(Dominant to
Recessive)
RXD Propagation Delay
(Recessive to
Dominant)
RXD Propagation Delay
(Dominant to
t
V
V
V
V
= 5V, R
= 5V, R
is open, Figure 1
ns
ns
ns
ns
ONTXD
DD
DD
DD
DD
CM
CM
t
is open, Figure 1
25
40
30
50
70
OFFTXD
t
= 5V, Figure 3
= 5V, Figure 3
ONRXD
t
70
OFFRXD
Recessive)
TXD-Dominant Timeout
Wake-Up Time
t
Figure 4
Figure 5
1.3
4.3
ms
DOM
t
2
μs
WAKE
Standby Propagation
Delay (Dominant to
Recessive)
t
STBY = V , Figure 5
350
ns
PLH_STBY
DD
Standby to Normal
Mode Delay
Normal to Standby
Dominant Delay
Shutdown to Normal
Delay
C = 15pF, Figure 6
L
t
t
20
35
25
μs
μs
μs
D_STBYN
C = 15pF, Figure 6
L
D_NSTBY
t
C = 15pF, Figure 7
L
D_SHDNN
All units are 100% production tested at T = +25°C. Specifications over temperature are guaranteed by design.
A
Note 1:
Note 2:
Not production tested. Guaranteed at T = +25°C.
A
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Maxim Integrated | 6
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
R
R
CM
CM
CANH
R
TXD
V
DIFF
C
LD
LD
V
CM
CANL
V
DD
50%
50%
TXD
0V
t
t
OFFTXD
ONTXD
90%
10%
0.9V
V
DIFF
0.5V
t
t
F
R
Figure 1. Transmitter Test Circuit and Timing Diagram
CANH
TXD
R
LD
C
LD
CANL
RXD
C
L
V
DD
50%
TXD
RXD
0V
t
LOOP2
V
DD
50%
0V
t
LOOP1
Figure 2. TXD to RXD Loop Delay
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Maxim Integrated | 7
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
CANH
+
RXD
L
V
ID
-
C
CANL
0.9V
V
ID
0.5V
t
t
OFFRXD
ONRXD
V
OH
RXD
50%
50%
V
OL
Figure 3. RXD Timing Diagram
TRANSMITTER
ENABLED
t
DOM
V
DD
TXD
0V
TRANSMITTER
DISABLED
V
- V
CANL
CANH
Figure 4. Transmitter-Dominant Timeout Timing Diagram
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Maxim Integrated | 8
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
V
DD
CANH
CANL
STBY
RXD
R
LD
C
LD
C
L
t
WAKE
t
PLH_STBY
V
DD
RXD
0V
V
- V
CANL
CANH
Figure 5. Standby Receiver Propagation Delay
V
DD
50%
50%
STBY
t
0V
t
D_NSTBY
D_STBYN
0.9V
V
OD
0.5V
Figure 6. Standby Mode Timing Diagram
V
DD
50%
SHDN
0V
t
D_SHDNN
0.9V
V
OD
Figure 7. Shutdown Mode Timing Diagram
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Maxim Integrated | 9
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
Typical Operating Characteristics
VDD = 5V, RLD = 60Ω, CLD = 100pF, CL = 15pF, TA = +25°C, unless otherwise noted.
SUPPLY CURRENT
vs. DATA RATE
SUPPLY CURRENT
vs. TEMPERATURE
CANH/CANL OUTPUT VOLTAGE
vs. TEMPERATURE
toc03
toc01
toc02
60
50
40
30
20
10
0
60
50
40
30
20
10
0
4
3.5
3
CANH
TXD = LOW
60Ω LOAD
2.5
2
60Ω LOAD
CANL
1.5
1
TXD = HIGH
NO LOAD
TXD = LOW
NO LOAD
NO LOAD
0.5
0
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
1
10
100
1000
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
DATA RATE (kbps)
(CANH - CANL) DIFFERENTIAL OUTPUT
vs. LOAD
STANDBY CURRENT
vs. TEMPERATURE
SHUTDOWN CURRENT
vs. TEMPERATURE
toc04
toc05
toc06
3
2.5
2
100
90
80
70
60
50
40
30
20
10
0
2
1.8
1.6
1.4
1.2
1
1.5
1
0.8
0.6
0.4
0.2
0
0.5
0
40
60
80
100
120
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
LOAD RESISTANCE (Ω)
SLOW RISE/FALL TIME
vs. DATA RATE
TXD PROPAGATION DELAY
vs. TEMPERATURE
RXD PROPAGATION DELAY
vs. TEMPERATURE
toc07
toc08
toc09
300
250
200
150
100
50
80
70
60
50
40
30
20
10
0
80
70
60
50
40
30
20
10
0
tOFFRXD
tONTXD
FALL TIME
tONRXD
RISE TIME
tOFFTXD
0
1
10
100
1000
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
DATA RATE (kbps)
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Maxim Integrated | 10
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
SLEW RATE WITH
SLEW RATE WITH
STBY GROUNDED
26.1kΩ TO GND ON STBY
toc10
toc11
VCANH
VCANL
VCANH
VCANL
1V/div
1V/div
1V/div
1V/div
VCANH-
CANL
VCANH-
CANL
2V/div
5V/div
2V/div
5V/div
VTXD
VTXD
VRXD
VRXD
5V/div
5V/div
200ns/div
1µs/div
Pin Configurations
TOP VIEW
+
TXD
GND
VDD
1
2
3
4
8
7
6
5
STBY
CANH
CANL
SHDN
MAX33042E
RXD
Pin Descriptions
PIN
NAME
FUNCTION
Transmit Data Input. Drive TXD high to set the driver in the recessive state. Drive TXD low to
set the driver in the dominant state. TXD has an internal pullup to VDD.
TXD
1
GND
VDD
2
3
Ground
Supply Voltage. Bypass VDD to GND with a 0.1µF capacitor.
Receive Data Output. RXD is high when CANH and CANL are in the recessive state. RXD is
low when CANH and CANL are in the dominant state.
Shutdown input, CMOS/TTL compatible. Drive SHDN high to put MAX33042E in shutdown.
SHDN has an internal pulldown resistor to GND.
RXD
4
5
SHDN
CANL
CANH
6
7
CAN Bus-Line Low
CAN Bus-Line High
Standby Mode. A logic-high on STBY pin selects the standby mode. In standby mode, the
transceiver is not able to transmit data and the receiver is in low-power mode. A logic-low on
STBY pin puts the transceiver in normal operating mode. A 26.1kΩ external resistor can be
used to connect the STBY pin to ground for the slow slew rate.
STBY
8
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Maxim Integrated | 11
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
Functional Diagrams
VDD
MAX33042E
THERMAL
SHUTDOWN
DOMINANT
TIMEOUT
TXD
PROTECTION
PROTECTION
CANH
CANL
DRIVER
SHDN
STBY
WAKE-UP MODE
CONTROL
WAKE-UP
FILTER
RXD
GND
Detailed Description
The MAX33042E is a fault-protected CAN transceiver designed for industrial applications with a number of integrated
robust protection features. This device provides a link between the CAN protocol controller and the physical wires of the
bus lines in a control area network (CAN). They can be used for DeviceNet™ applications as well.
The CAN transceiver is fault-protected on CANH and CANL up to ±40V, making it suitable for applications where
overvoltage protection is required. This device is rated up to a high ±40kV ESD HBM on CANH and CANL, suitable for
protection during the manufacturing process, and even in the field where there is human interface for installation and
maintenance. In addition, a common-mode voltage of ±25V enables communication in noisy environments where there
are ground plane differences between different systems due to the close proximity of heavy equipment machinery or
operation from different transformers. This device’s dominant timeout prevents the bus from being blocked by a hung-up
microcontroller. The CANH and CANL outputs are short-circuit, current-limited, and protected against excessive power
dissipation by thermal shutdown circuitry that places the driver outputs in a high-impedance state.
These devices can operate up to 4Mbps with a standby mode where it shuts off the transmitter and reduces the current
to 45μA, typ.
±40V Fault Protection
The MAX33042E features ±40V of fault protection. The CANH and CANL data lines are capable of withstanding a short
from -40V to +40V. This extended overvoltage range makes The MAX33042E suitable for applications where accidental
shorts to power supply lines are possible due to human intervention.
Transmitter
The transmitter converts a single-ended input signal (TXD) from the local CAN controller to differential outputs for the
CANH and CANL bus lines. The truth table for the transmitter and receiver is provided in Table 1.
Transmitter Output Protection
The MAX33042E protects the transmitter output stage against a short-circuit to a positive or negative voltage by limiting
the driver current. Thermal shutdown further protects the devices from excessive temperatures that may result from a
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Maxim Integrated | 12
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
short or high ambient temperature. The transmitter returns to normal operation once the temperature is reduced below
the threshold.
Transmitter-Dominant Timeout
The device features a transmitter-dominant timeout (tDOM) that prevents erroneous CAN controllers from clamping the bus
to a dominant level by maintaining a continuous low TXD signal. When TXD remains in the dominant state (low) for greater
than 2.5ms typical tDOM, the transmitter is disabled, releasing the bus to a recessive state (Figure 4). After a dominant
timeout fault, the transmitter is re-enabled when receiving a rising edge at TXD. The transmitter-dominant timeout limits
the minimum possible data rate to 9kbps for standard CAN protocol.
Receiver
The receiver reads the differential input from the bus line CANH and CANL and transfers this data as a single-ended
output RXD to the CAN controller. It consists of a comparator that senses the difference, VDIFF = (CANH - CANL), with
respect to an internal threshold of 0.7V. If VDIFF > 0.9V, a logic-low is present on RXD. If VDIFF < 0.5V, a logic-high is
present. The CANH and CANL common-mode range is ±25V. RXD is a logic-high when CANH and CANL are shorted or
terminated and undriven.
Standby Mode
Drive the STBY pin high for standby mode, which switches the transmitter off and the receiver to a low current and low-
speed state. The supply current is reduced during standby mode. The bus line is monitored by a low differential
comparator to detect and recognize a wakeup event on the bus line. Once the comparator detects a dominant bus level
greater than 2μs typical tWAKE, RXD pulls low. Drive the STBY pin low for normal operation.
Slow Slew Rate
Connect a 26.1kΩ resistor between ground and the STBY pin to reduce the slew rate on the transmitter output. The STBY
pin voltage should be between 0.1V to 0.6V to remain in slow slew rate. This will change the MAX33042E with a slow
slew rate of 50V/μs for rising edge compared with normal mode at 200V/μs. For falling edge, the slow slew rate is 30V/μs
compared with normal mode at 110V/μs.
Table 1. Transmitter and Receiver Truth Table (When Not Connected to the Bus)
MODE
Normal (STBY = low)
Normal (STBY = low)
Normal (STBY = low)
Standby (STBY = high)
Standby (STBY = high)
Shutdown (SHDN = STBY = high)
X = Don't care
TXD
Low
Low
High
X
TXD LOW TIME CANH
CANL
Low
BUS STATE
Dominant
Recessive
Recessive
Dominant
Recessive
Recessive
RXD
Low
High
High
Low
High
High
< tDOM
High
VDD/2
VDD/2
High
> tDOM
VDD/2
VDD/2
Low
X
X
X
X
X
VDD/2
VDD/2
VDD/2
VDD/2
X
Shutdown Mode
Drive the SHDN pin high for shutdown mode, which switches the transmitter and receiver off. The supply current is
reduced to maximum of 3μA during shutdown mode. Drive the SHDN pin low for normal operation.
www.maximintegrated.com
Maxim Integrated | 13
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
Applications Information
Reduced EMI and Reflections
In multidrop CAN applications, it is important to maintain a single linear bus of uniform impedance that is properly
terminated at each end. A star, ring, or tree configuration should never be used. Any deviation from the end-to-end wiring
scheme creates a stub. High-speed data edges on a stub can create reflections back down to 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 short as possible,
especially when operating with high data rates.
Typical Application Circuits
Multidrop CAN Bus
3.3V
60ꭥ
60ꭥ
60ꭥ
60ꭥ
0.1µF
47nF
0.1µF
RX
47nF
VDD
RXD
TXD
TRANSCEIVER 4
MICROCONTROLLER
TXD
STBY
SHDN
GPIO
GPIO
MAX33042E
TRANSCEIVER 2
TRANSCEIVER 3
Ordering Information
PART NUMBER
MAX33042EASA+*
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
8 SO
MAX33042EASA+T*
MAX33042EAKA+
8 SO
8 SOT23
8 SOT23
MAX33042EAKA+T
+Denotes a lead (Pb)-free/RoHS-compliant package.
*Future product—contact factory for availability.
www.maximintegrated.com
Maxim Integrated | 14
MAX33042E
+5V, 4Mbps CAN Transceiver with
±40V Fault Protection, ±25V CMR,
and ±40kV ESD in 8-Pin SOT23
Revision History
REVISION
NUMBER
0
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
1/21
Initial release
—
DeviceNet is a trademark of Open DeviceNet Vendor Association.
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
©2021 Maxim Integrated Products, Inc.
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