19-2670; Rev 0; 10/02
±80V Fault-Protected, 2Mbps, Low Supply
Current CAN Transceivers
General Description
The MAX3050/MAX3057 interface between the CAN
protocol controller and the physical wires of the bus
lines in a controller area network (CAN). They are pri-
marily intended for automotive systems requiring data
rates up to 2Mbps and feature ±80V fault protection
against short circuits in high-voltage power buses. They
provide differential transmit capability to the bus and
differential receive capability to the CAN controller.
The MAX3050/MAX3057 have four modes of operation:
high speed, slope control, standby, and shutdown.
High-speed mode allows data rates up to 2Mbps. In
slope-control mode, data rates are 40kbps to 500kbps,
so the effects of EMI are reduced, and unshielded
twisted or parallel cable can be used. In standby mode,
the transmitters are shut off and the receivers are put
into low-current mode. In shutdown mode, the transmit-
ter and receiver are switched off.
The MAX3050 has an AutoShutdown™ function that
puts the device into a 15µA shutdown mode when the
bus or CAN controller is inactive for 4ms or longer.
The MAX3050/MAX3057 are available in an 8-pin SO
package and are specified for operation from -40°C to
+125°C.
Features
o
±80V Fault Protection for 42V Systems
o
Four Operating Modes
High-Speed Operation Up to 2Mbps
Slope-Control Mode to Reduce EMI
(40kbps to 500kbps)
Standby Mode
Low-Current Shutdown Mode
o
AutoShutdown when Device Is Inactive
(MAX3050)
o
Automatic Wake-Up from Shutdown (MAX3050)
o
Thermal Shutdown
o
Current Limiting
o
Fully Compatible with the ISO 11898 Standard*
*
Pending completion of testing.
MAX3050/MAX3057
Ordering Information
PART
MAX3050ASA
MAX3057ASA
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
8 SO
8 SO
Pin Configuration
TOP VIEW
TXD
1
GND
V
CC
2
3
8
7
RS
CANH
CANL
SHDN
Applications
Automotive Systems
HVAC Controls
Telecom 72V systems
MAX3050
MAX3057
6
5
RXD
4
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
SO
Typical Operating Circuit
V
CC
120Ω
0.1µF
CAN
CONTROLLER
V
CC
CANH
TX0
RX0
30pF
GND
24kΩ TO 180kΩ
MAX3050
MAX3057
CANL
TXD
RXD
SHDN
RS
GND
(100nF)
120Ω
( ) ARE FOR 3050 ONLY.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
±80V Fault-Protected, 2Mbps, Low Supply
Current CAN Transceivers
MAX3050/MAX3057
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ............................................................ -0.3V to +6V
TXD, RS, RXD,
SHDN
to GND ....................-0.3V to (V
CC
+ 0.3V)
CANH, CANL to GND..............................................-80V to +80V
RXD Shorted to GND................................................. Continuous
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C) .................470mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
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.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +5V ±10%, R
L
= 60Ω, RS = GND, T
A
= T
MIN
to T
MAX
. Typical values are at V
CC
= +5V and T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
Dominant (Note 1)
Supply Current
I
S
Dominant no load
Recessive (Note 1)
Recessive no load
Quiescent Current Standby Mode
Shutdown Supply Current
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
TXD INPUT LEVELS
High-Level Input Voltage
Low-Level Input Voltage
High-Level Input Current
Pullup Resistor
CANH, CANL TRANSMITTER
Recessive Bus Voltage
V
CANH,
V
CANL
V
TXD
= V
CC
, no load
-2V < V
CANH
, V
CANL
< +7V
SHDN
= GND, V
TXD
= V
CC
-80V < V
CANH
, V
CANL
< +80V
SHDN
= GND, V
TXD
= V
CC
V
TXD
= 0
V
TXD
= 0
V
TXD
= 0
V
TXD
= 0, R
L
= 45Ω
V
TXD
= V
CC
, no load
V
CANH
= -5V
V
CANL
= 18V
2
-2
-4
3.0
0
1.5
1.5
-500
-200
200
+50
3
+1
mA
+4
V
CC
2.0
5
V
V
V
mV
mA
mA
V
V
IH
V
IL
I
IH
R
INTXD
V
TXD
= V
CC
1
20
2
0.4
V
V
µA
kΩ
I
Q
I
QSHDN
V
RS
= V
CC
SHDN
= GND
125
15
160
20
3.6
MIN
TYP
56
MAX
72
6
5.5
5.5
260
30
µA
µA
°C
°C
mA
UNITS
Off-State Output Leakage
I
LO
CANH Output Voltage
CANL Output Voltage
Differential Output
(V
CANH
- V
CANL
)
CANH Short-Circuit Current
CANL Short-Circuit Current
V
CANH
V
CANL
∆V
CANH
,
V
CANL
I
SC
I
SC
2
_______________________________________________________________________________________
±80V Fault-Protected, 2Mbps, Low Supply
Current CAN Transceivers
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V ±10%, R
L
= 60Ω, RS = GND, T
A
= T
MIN
to T
MAX
. Typical values are at V
CC
= +5V and T
A
= +25°C.)
PARAMETER
Differential Input Voltage
(Recessive)
Differential Input Voltage
(Dominant)
Differential Input Hysteresis
CANH Input Wake-Up Voltage
Threshold
RXD High-Level Output Voltage
RXD Low-Level Output Voltage
CANH and CANL Input
Resistance
Differential Input Resistance
MODE SELECTION (RS)
Input Voltage for High Speed
Input Voltage for Standby
Slope-Control Mode Voltage
Slope-Control Mode Current
Standby Mode
High-Speed Mode Current
SHUTDOWN
SHDN
Input Pullup Resistor
SHDN
Input Voltage High
SHDN
Input Voltage Low
R
INSHDN
MAX3057
500
2
0.5
900
kΩ
V
V
V
SLP
V
STBY
V
SLOPE
I
SLOPE
I
STBY
I
HS
V
RS
= 0
R
RS
= 24kΩ to 180kΩ
R
RS
= 24kΩ to 180kΩ
0.75
✕
V
CC
0.4
✕
V
CC
-200
-10
0.6
✕
V
CC
-10
+10
-500
0.3
✕
V
CC
V
V
V
µA
µA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX3050/MAX3057
DC BUS RECEIVER
(V
TXD
= V
CC
; CANH and CANL externally driven; -2V < V
CANH
, V
CANL
< +7V, unless otherwise specified)
V
DIFF
V
DIFF
V
DIFF(HYST)
V
CANH
(SHDN)
-7V < V
CANH
, V
CANL
< +12V
-7V < V
CANH
, V
CANL
< +12V
-1.0
0.9
150
+0.5
3.3
V
V
mV
SHDN
= GND, V
TXD
= V
CC
(MAX3050)
I = -100µA
I = 10mA
I = 5mA
6
0.8
✕
V
CC
9
V
V
V
OH
V
OL
R
I
R
DIFF
0.8
0.4
5
10
25
100
V
kΩ
kΩ
_______________________________________________________________________________________
3
±80V Fault-Protected, 2Mbps, Low Supply
Current CAN Transceivers
MAX3050/MAX3057
TIMING CHARACTERISTICS
(V
CC
= +5V ±10%, R
L
= 60Ω, C
L
= 100pF, T
A
= T
MIN
to T
MAX
. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Figures 1, 2, and 3)
PARAMETER
TIMING
V
RS
= 0 (2Mbps)
Minimum Bit Time
t
BIT
R
RS
= 24kΩ (500kbps)
R
RS
= 100kΩ (125kbps)
R
RS
= 180kΩ (62.5kbps)
Delay TXD to Bus Active
Delay TXD to Bus Inactive
t
ONTXD
t
OFFTXD
V
RS
= 0
V
RS
= 0
V
RS
= 0 (2Mbps)
Delay TXD to Receiver Active
t
ONRXD
R
RS
= 24kΩ (500kbps)
R
RS
= 100kΩ (125kbps)
R
RS
= 180kΩ (62.5kbps)
V
RS
= 0 (2Mbps)
Delay TXD to Receiver Inactive
t
OFFRXD
R
RS
= 24kΩ (500kbps)
R
RS
= 100kΩ (125kbps)
R
RS
= 180kΩ (62.5kbps)
R
RS
= 24kΩ (500kbps)
Differential Output Slew Rate
Bus Dominant to RXD Low
Time to Wake Up: CANH > 9V
Time to Sleep Mode when Bus Is
Recessive
t
WAKE
t
SHDN
SR
R
RS
= 100kΩ (125kbps)
R
RS
= 180kΩ (62.5kbps)
Standby mode
SHDN
= GND, V
TXD
= V
CC
(MAX3050)
C
SHDN
= 100nF (MAX3050)
10
14
7
1.6
10
10
47
µs
µs
ms
V/µs
0.5
2
8
25
40
75
120
0.4
1.6
5.0
130
0.45
1.6
5.0
µs
ns
µs
ns
ns
ns
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
As defined by ISO, bus value is one of two complementary logical values: dominant or recessive. The dominant value repre-
sents the logical 1 and the recessive represents the logical 0. During the simultaneous transmission of the dominant and
recessive bits, the resulting bus value is dominant. For MAX3050 and MAX3057 values, see the truth table in the
Transmitter
and
Receiver
sections.
4
_______________________________________________________________________________________
±80V Fault-Protected, 2Mbps, Low Supply
Current CAN Transceivers
MAX3050/MAX3057
V
CC
120Ω
0.1µF
CAN
CONTROLLER
V
CC
CANH
100pF
TX0
RX0
30pF
GND
24kΩ TO 180kΩ
MAX3050
MAX3057
CANL
TXD
RXD
SHDN
RS
GND
(100nF)
120Ω
( ) ARE FOR MAX3050 ONLY.
Figure 1. AC Test Circuit
TXD
9V
CANH
CANL
DOMINANT
0.9V
CANH - CANL
0.5V RECESSIVE
CANH
V
SHDN
= 2V
V
SHDN
RXD
V
CC
/2
V
CC
/2
t
ONTXD
t
OFFTXD
t
WAKE
t
ONRXD
t
OFFRXD
Figure 2. Timing Diagram for Dynamic Characteristics
Figure 3. Time to Wake Up (t
WAKE
) (MAX3050)
_______________________________________________________________________________________
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