Maxim MAX3051EKA-T, MAX3051ESA Schematic [ru]

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
♦ 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

CANL

SHDNRXD

1
2

87RS

CANHGND

V

CC

TXD

SO/SOT23

TOP VIEW

3

4

6

5

MAX3051

Pin Configuration

Ordering Information

19-3274; Rev 0; 5/04

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

PIN-

TOP

MARK

MAX3051ESA

8 SO —

MAX3051EKA-T

AEKF

PACKAGE

-40°C to +85°C

-40°C to +85°C 8 SOT23-8

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

PARAMETER

CONDITIONS

UNITS

Dominant 35 70
Recessive 2 5

mA

Supply Current I

S

Standby 8 15 µA

Shutdown Current I

SHDN

V

SHDN

= VCC, TXD = VCC or floating 1 µA

Thermal-Shutdown Threshold V

TSH

°C

Thermal-Shutdown Hysteresis 25 °C

TXD INPUT LEVELS

High-Level Input Voltage V

IH

2

V

CC

+

V

Low-Level Input Voltage V

IL

0.8 V

Input Capacitance C

IN

5pF

Pullup Resistor R

INTXD

50

kΩ

CANH, CANL TRANSMITTER

V

TXD

= VCC, no load 2 2.3 3 V

Recessive Bus Voltage

V

CANH

,

V

CANL

V

TXD

= VCC, no load, VRS = V

CC

(standby mode)

mV

Off-State Output Leakage

µA

Input Leakage Current V

CC

= 0V, V

CANH

= V

CANL

= 5V

µA

CANH Output Voltage V

CANH

V

TXD

= 0V

V

CANL Output Voltage V

CANL

V

TXD

= 0V

V

V

TXD

= 0V 1.5 3.0

V

TXD

= 0V, RL = 45Ω 1.2 3.0

V

V

TXD

= VCC, no load

Differential Output

(V

CANH

-

V

TXD

= V

CC, RL

= 60Ω

mV

SYMBOL

MIN TYP MAX

+160

V

CANL

-2V < V

)

CANH, VCANL

-100 +100

< +7V, SHDN = HIGH -250 +250

-250 +250

2.45

-500 +50

-120 +12

0.3V

100

1.25

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)

PARAMETER

CONDITIONS

UNITS

-7V ≤ V

CANH

≤ 0V

CANH Short-Circuit Current

Minimum foldback current -35

mA

CANL Short-Circuit Current

VCC ≤ V

CANL

≤ 12V

mA

RXD OUTPUT LEVELS

RXD High Output-Voltage Level V

OH

I = -1mA

0.8 x
V

RXD Low Output-Voltage Level V

OL

I = 4mA 0.4 V

D C BU S R EC EI VER ( V

T XD

= V

C C

; 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 A N H

, V

C A N L

≤ + 1 2 V, un le s s ot h e r w i s e sp e c if i e d )

-7V ≤ VCM ≤ +12V 0.5

Differential Input Voltage
(Recessive)

V

DIFF

VRS = VCC (standby mode) 0.5

V

Dominant 0.9

Differential Input Voltage
(Dominant)

V

DIFF

VRS = VCC (standby mode) 1.1

V

Differential Input Hysteresis

20 mV

CANH and CANL Input
Resistance

R

I

20 50 kΩ

Differential Input Resistance R

DIFF

40

kΩ

MODE SELECTION (RS)

Input Voltage for High Speed V

SLP

0.3 x
V

Input Voltage for Standby V

STBY

0.75 x
V

Slope-Control Mode Voltage

RRS = 25kΩ to 200kΩ

0.4 x

0.6 x
V

High-Speed Mode Current I

HS

VRS = 0

µA

SHUTDOWN (SHDN)

SHDN Input Voltage High

2V

SHDN Input Voltage Low

0.8 V

SHDN Pulldown Resistor

50

kΩ

SYMBOL

I

CANHSC

I

CANLSC

V

D IF F( H Y S T )

V

SLOPE

V

SHDNH

V

SHDNL

R

INSHDN

MIN TYP MAX

-200

V

CC

V

V

CC

CC

200

V

CC

100

V

CC

V

CC

-500

100

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.)

PARAMETER

SYMBOL

CONDITIONS MIN TYP MAX

UNITS

VRS = 0V (≤1Mbps) 50
RRS = 25kΩ (≤500kbps) 183

Delay TXD to Bus Active
(Figure 1)

t

ONTXD

RRS = 100kΩ (≤125kbps) 770

ns

VRS = 0V (≤1Mbps) 70
RRS = 25kΩ (≤500kbps) 226

Delay TXD to Bus Inactive
(Figure 1)

RRS = 100kΩ (≤125kbps) 834

ns

VRS = 0V (≤1Mbps) 80
RRS = 25kΩ (≤500kbps) 200

Delay Bus to Receiver Active
(Figure 1)

RRS = 100kΩ (≤125kbps) 730

ns

VRS = 0V (≤1Mbps) 100
RRS = 25kΩ (≤500kbps) 245

Delay Bus to Receiver Inactive
(Figure 1)

RRS = 100kΩ (≤125kbps) 800

ns

VRS = 0V (≤1Mbps) 96
RRS = 25kΩ (≤500kbps) 12.5
RRS = 100kΩ (≤125kbps) 2.9

Differential-Output Slew Rate SR

R

RS

= 200kΩ (≤62.5kbps) 1.6

V/µs

Bus Dominant to RXD Active t

DRXDL

VRS > 0.8 x VCC, standby, Figure 2 1 µs

Standby to Receiver Active

BUS dominant, Figure 2 4 µs

SHDN to Bus Inactive

TXD = GND, Figure 3 (Note 2) 1 µs

S H DN to Recei ver Acti ve

BUS dominant, Fi gur e 3 (Note 3) 4 µs

S H D N to S tand b y

Fi g ur e 4 20 µs

t

OFFTXD

t

ONRXD

t

OFFRXD

t

SBRXDL

t

OFFSHDN

t

ONSHDN

t

SHDNSB

MAX3051

+3.3V, 1Mbps, Low-Supply-Current

CAN Transceiver

_______________________________________________________________________________________ 5

TXD

V

DIFF

0.9V

RXD

0.5V

VCC/2 VCC/2

t

ONTXD

t

ONRXD

t

OFFTXD

t

OFFRXD

VCC/2 VCC/2

Figure 1. Timing Diagram Figure 2. Timing Diagram for Standby Signal

Figure 3. Timing Diagram for Shutdown Signal

0.75V × V

CC

RS

SHDN

VCC/2

t

SHDNSB

Figure 4. Timing Diagram for Shutdown-to-Standby Signal

Timing Diagrams

V

RS

DIFF

RXD

x 0.75

V

CC

t

SBRXDL

VCC/2 VCC/2

BUS EXTERNALLY

SHDN

VCC/2

V

/2

CC

DRIVEN

1.1V

t

DRXDL

t

OFFSHDN

V

DIFF

0.5V

RXD

t

ONSHDN

BUS EXTERNALLY

DRIVEN

/2

V

CC