MAXIM MAX3051 User Manual
General Description
The MAX3051 interfaces between the CAN protocol
controller and the physical wires of the bus lines in a
controller area network (CAN). The MAX3051 provides
differential transmit capability to the bus and differential
receive capability to the CAN controller. The MAX3051
is primarily intended for +3.3V single-supply applications that do not require the stringent fault protection
specified by the automotive industry (ISO 11898).
The MAX3051 features four different modes of operation: high-speed, slope-control, standby, and shutdown
mode. High-speed mode allows data rates up to
1Mbps. The slope-control mode can be used to
program the slew rate of the transmitter for data rates of
up to 500kbps. This reduces the effects of EMI, thus
allowing the use of unshielded twisted or parallel cable.
In standby mode, the transmitter is shut off and the
receiver is pulled high, placing the MAX3051 in lowcurrent mode. In shutdown mode, the transmitter and
receiver are switched off.
The MAX3051 input common-mode range is from -7V to
+12V, exceeding the ISO 11898 specification of -2V to
+7V. These features, and the programmable slew-rate
limiting, make the part ideal for nonautomotive, harsh
environments. The MAX3051 is available in 8-pin SO
and SOT23 packages and operates over the -40°C to
+85°C extended temperature range.
Applications
Printers JetLink
Industrial Control and Networks
Telecom Backplane
Consumer Applications
Features
♦ Low +3.3V Single-Supply Operation
♦ ESD Protection
±12kV Human Body Model
♦ Wide -7V to +12V Common-Mode Range
♦ Small SOT23 Package
♦ Four Operating Modes
High-Speed Operation Up to 1Mbps
Slope-Control Mode to Reduce EMI (Up to 500kbps)
Standby Mode
Low-Current Shutdown Mode
♦ Thermal Shutdown
♦ Current Limiting
MAX3051
+3.3V, 1Mbps, Low-Supply-Current
CAN Transceiver
________________________________________________________________ Maxim Integrated Products 1
Pin Configuration
Ordering Information
19-3274; Rev 1; 6/05
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.
Typical Operating Circuit at end of data sheet.
PART TEMP RANGE
MAX3051ESA -40°C to +85°C 8 SO —
MAX3051EKA-T -40°C to +85°C 8 SOT23-8 AEKF
PINPACKAGE
TOP
MARK
TOP VIEW
TXD
V
1
2
MAX3051
3
CC
4
SO/SOT23
87RS
6
5
CANHGND
CANL
SHDNRXD
MAX3051
+3.3V, 1Mbps, Low-Supply-Current
CAN Transceiver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +3.3V ±5%, RL= 60Ω, CL= 100pF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= +3.3V and TA=
+25°C.) (Note 1)
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.
VCCto GND..............................................................-0.3V to +6V
TXD, RS, SHDN to GND ...........................................-0.3V to +6V
RXD to GND .............................................................-0.3V to +6V
CANH, CANL to GND..........................................-7.5V to +12.5V
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)...................470mW
8-Pin SOT23 (derate 9.7mW/°C above +70°C).............774mW
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature Range (soldering, 10s)......................+300°C
Supply Current I
Shutdown Current I
Thermal-Shutdown Threshold V
Thermal-Shutdown Hysteresis 25 °C
TXD INPUT LEVELS
High-Level Input Voltage V
Low-Level Input Voltage V
Input Capacitance C
Pullup Resistor R
CANH, CANL TRANSMITTER
Recessive Bus Voltage
Off-State Output Leakage -2V < V
Input Leakage Current V
CANH Output Voltage V
CANL Output Voltage V
Differential Output
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
S
SHDN
TSH
IH
IL
IN
INTXD
V
,
CANH
V
CANL
CANH
CANL
(V
-
CANH
)
V
CANL
Dominant 35 70
Recessive 2 5
Standby 8 15 µA
V
SHDN
V
= VCC, no load 2 2.3 3 V
TXD
V
= VCC, no load, VRS = V
TXD
(standby mode)
= 0V, V
CC
V
= 0V 2.45 V
TXD
V
= 0V 1.25 V
TXD
V
= 0V 1.5 3.0
TXD
V
= 0V, RL = 45Ω 1.2 3.0
TXD
V
= VCC, no load -500 +50
TXD
V
= V
TXD
= VCC, TXD = VCC or floating 1 µA
+160 °C
V
+
2
50 100 kΩ
CC
CANH, VCANL
CANH
CC, RL
< +7V, SHDN = HIGH -250 +250 µA
= V
= 60Ω -120 +12
= 5V -250 +250 µA
CANL
-100 +100 mV
5pF
CC
0.3V
0.8 V
mA
V
V
mV
MAX3051
+3.3V, 1Mbps, Low-Supply-Current
CAN Transceiver
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +3.3V ±5%, RL= 60Ω, CL= 100pF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= +3.3V and TA=
+25°C.) (Note 1)
CANH Short-Circuit Current I
CANL Short-Circuit Current I
RXD OUTPUT LEVELS
RXD High Output-Voltage Level V
RXD Low Output-Voltage Level V
D C BU S R EC EI VER ( V
Differential Input Voltage
(Recessive)
Differential Input Voltage
(Dominant)
Differential Input Hysteresis V
CANH and CANL Input
Resistance
Differential Input Resistance R
MODE SELECTION (RS)
Input Voltage for High Speed V
Input Voltage for Standby V
Slope-Control Mode Voltage V
High-Speed Mode Current I
SHUTDOWN (SHDN)
SHDN Input Voltage High V
SHDN Input Voltage Low V
SHDN Pulldown Resistor R
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CANHSC
CANLSCVCC
OH
OL
= V
T XD
; C A N H a n d C A N L e x t e r n a l l y dr iv e n ; - 7 V ≤ V
C C
V
DIFF
V
DIFF
D IF F( H Y S T )
R
I
DIFF
SLP
STBY
SLOPERRS
HS
SHDNH
SHDNL
INSHDN
-7V ≤ V
Minimum foldback current -35
≤ V
I = -1mA
I = 4mA 0.4 V
-7V ≤ VCM ≤ +12V 0.5
VRS = VCC (standby mode) 0.5
Dominant 0.9
VRS = VCC (standby mode) 1.1
= 25kΩ to 200kΩ
VRS = 0 -500 µA
≤ 0V -200
CANH
≤ 12V 200 mA
CANL
C A N H
0.8 x
V
CC
, V
≤ + 1 2 V, un le s s ot h e r w i s e sp e c if i e d )
C A N L
20 mV
20 50 kΩ
40 100 kΩ
0.75 x
V
CC
0.4 x
V
CC
2V
50 100 kΩ
V
CC
0.3 x
V
CC
0.6 x
V
CC
0.8 V
mA
V
V
V
V
V
V
MAX3051
+3.3V, 1Mbps, Low-Supply-Current
CAN Transceiver
4 _______________________________________________________________________________________
Note 1: All currents into device are positive; all currents out of the device are negative. All voltages are referenced to device
ground, unless otherwise noted.
Note 2: No other devices on the BUS.
Note 3: BUS externally driven.
TIMING CHARACTERISTICS
(VCC= +3.3V ±5%, RL= 60Ω, CL= 100pF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= +3.3V and TA=
+25°C.)
Delay TXD to Bus Active
(Figure 1)
Delay TXD to Bus Inactive
(Figure 1)
Delay Bus to Receiver Active
(Figure 1)
Delay Bus to Receiver Inactive
(Figure 1)
Differential-Output Slew Rate SR
Bus Dominant to RXD Active t
Standby to Receiver Active t
SHDN to Bus Inactive t
S H DN to Recei ver Acti ve t
S H D N to S tand b yt
ESD Protection Human Body Model ±12 kV
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
t
ONTXD
t
OFFTXD
t
ONRXD
t
OFFRXD
DRXDL
SBRXDL
OFFSHDN
ONSHDN
SHDNSB
VRS = 0V (≤1Mbps) 50
RRS = 25kΩ (≤500kbps) 183
RRS = 100kΩ (≤125kbps) 770
VRS = 0V (≤1Mbps) 70
RRS = 25kΩ (≤500kbps) 226
RRS = 100kΩ (≤125kbps) 834
VRS = 0V (≤1Mbps) 80
RRS = 25kΩ (≤500kbps) 200
RRS = 100kΩ (≤125kbps) 730
VRS = 0V (≤1Mbps) 100
RRS = 25kΩ (≤500kbps) 245
RRS = 100kΩ (≤125kbps) 800
VRS = 0V (≤1Mbps) 96
RRS = 25kΩ (≤500kbps) 12.5
RRS = 100kΩ (≤125kbps) 2.9
= 200kΩ (≤62.5kbps) 1.6
R
RS
VRS > 0.8 x VCC, standby, Figure 2 1 µs
BUS dominant, Figure 2 4 µs
TXD = GND, Figure 3 (Note 2) 1 µs
BUS dominant, Fi gur e 3 (Note 3) 4 µs
Fi g ur e 4 20 µs
ns
ns
ns
ns
V/µs
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