MAXIM MAX3362 User Manual

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General Description

The MAX3362 low-power, high-speed transceiver for
RS-485/RS-422 communication operates from a single
+3.3V power supply. The device contains one differen­tial transceiver consisting of a line driver and receiver.
The transceiver operates at data rates up to 20Mbps,
with an output skew of less than 6ns. Driver and receiv­er propagation delays are guaranteed below 50ns. This
fast switching and low skew make the MAX3362 ideal
for multidrop clock/data distribution applications.

The output level is guaranteed at +1.5V with a standard
54Ω load, compliant with RS-485 specifications. The
transceiver draws 1.7mA supply current when
unloaded or fully loaded with the drivers disabled.
Additionally, the MAX3362 has a low-power shutdown
mode, reducing the supply current to 1µA.

The MAX3362 has a 1/8-unit-load receiver input imped­ance, allowing up to 256 transceivers on the bus. The
MAX3362 is designed for half-duplex communication.
The device has a hot-swap feature that eliminates false
transitions on the data cable during circuit initialization.
The drivers are short-circuit current limited, and a ther­mal shutdown circuit protects against excessive power
dissipation.

The MAX3362 is available in an 8-pin SOT package
and specified over industrial and automotive tempera­ture ranges.

Applications

Clock/Data Distribution
Telecom Equipment
Security Equipment
Point-of-Sale Equipment
Industrial Controls

Features

♦ Space-Saving 8-Pin SOT Package

♦ Guaranteed 20Mbps Data Rate

♦ Operates from a Single +3.3V Supply

♦ 6ns (max) Transmitter and Receiver Skew

♦ Hot-Swap Feature

♦ Interoperable with +5V Logic

♦ Allows up to 256 Transceivers on the Bus

♦ 1µA Low-Power Shutdown Mode

♦ 1.7mA Operating Supply Current

♦ -7V to +12V Common-Mode Range

♦ Current Limiting and Thermal Shutdown

♦ Half-Duplex Operation

♦ Automotive Temperature Range Variants

MAX3362

3.3V, High-Speed, RS-485/RS-422 Transceiver in
SOT Package

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2218; Rev 1; 5/02

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

Pin Configuration and Functional Diagram appear at end of
data sheet.

120Ω 120Ω

DI

D

B

PART TEMP RANGE

MAX3362EKA -40°C to +85°C 8 SOT23 AAJL

MAX3362AKA -40°C to +125°C 8 SOT23 AALL

PIN­PACKAGE

TOP MARK

B

DE

D

DE

RO

RE

R

MAX3362

A

D

DI DE RO

R

RE

D

DI DE RO

AABAB

R

R

RE

DI

RO

RE

MAX3362

3.3V, High-Speed, RS-485/RS-422 Transceiver in
SOT Package

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +3.3V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Notes 1, 2)

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.

All voltages with respect to GND.
V

CC

, RE, DE, DI ......................................................-0.3V to +6V

Receiver Input Voltages, Driver Output

Voltages (A, B) .......................................................-8V to +13V

Receiver Input Current, Driver Output

Current (A, B) .................................................................250mA

|V

A

- VB|..................................................................................+8V

Receiver Output Voltage (RO)....................-0.3V to (V

CC

+ 0.3V)

Continuous Power Dissipation (TA= +70°C)

8-Pin SOT (derate 9.7mW/°C above +70°C) ............... 777mW

Operating Temperature Range

MAX3362E__ .................................................. -40°C to +85°C

MAX3362A__ ................................................ -40°C to +125°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

DRIVER

Differential Driver Output V

Change in Magnitude of
Differential Output Voltage

Driver Common-Mode Output
Voltage

Change In Magnitude of
Common-Mode Voltage

Input High Voltage V

Input Low Voltage V

Input Hysteresis V
Input Current (DE, DI, RE)IIN0 < VIN < 5V ±1µA

Driver Short-Circuit Output
Current

Driver Short-Circuit Foldback
Output Current

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

OD

∆V

V

OC

∆V

IH

IL

HYS

I

OSD

I

OSDF

Figure 1, RL = 100Ω (RS-422)
(extended temperature range)

Figure 1, RL = 100Ω
(automotive temperature range)

Figure 1, RL = 54Ω (RS-485)
(extended temperature range)

Figure 1, RL = 54Ω or 100Ω

OD

(Note 3)

Figure 1, RL = 54Ω or 100Ω 3V

Figure 1, RL = 54Ω or 100Ω

OC

(Note 3)
DE, DI, RE 2.0 V
DE, DI, RE 0.8 V

DE, DI, RE 50 mV

0 < V

-7V < V

(VCC - 1V) < V

-7V < V

< 12V (Note 4) +250

OUT

< VCC (Note 4) -250

OUT

< 12V (Note 4) +25

OUT

< 1V (Note 4) -25

OUT

2.0

1.5

1.5

0.2 V

0.2 V

V

mA

mA

MAX3362

3.3V, High-Speed, RS-485/RS-422 Transceiver in
SOT Package

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.3V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Notes 1, 2)

SWITCHING CHARACTERISTICS (MAX3362E_ _ only)

(VCC= +3.3V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Thermal Shutdown Threshold V

Thermal Shutdown Hysteresis V

RECEIVER

Receiver Differential Threshold
Voltage

Receiver Input Hysteresis ∆V

Receiver Output High Voltage V

Receiver Output Low Voltage V

Three-State Output Current at
Receiver

Receiver Input Resistance R

Receiver Input Current I

Receiver Output Short-Circuit
Current

POWER SUPPLY

Supply Voltage V

Supply Current in Normal
Operation (Static Condition)

Supply Current in Shutdown
Mode

TS

TSH

V

TH

OH

OL

I

OZR

IN

I

OSR

CC

I

Q

I

SHDN

-7V < VCM < 12V -200 0 +200 mV

VA + VB = 0 25 mV

TH

IO = -1mA, VA - VB = V

IO = 1mA, VA - VB = -V

0 < VO < V

VCM = 12V 96 kΩ

IN

CC

TH

TH

DE = GND,
V

= GND or 3.465V

CC

0 < VRO < V

CC

No load, DI = VCC or GND 1.7 3 mA

DE = GND, RE = V

CC

150 °C

10 °C

VCC - 0.4 V

0.4 V

±1µA

VIN = +12V 125

V

= -7V -100

IN

±150 mA

3.135 3.300 3.465 V

110µA

µA

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Driver Propagation Delay

Driver Differential Output
Rise or Fall Time

Driver Output Skew t

Maximum Data Rate f

Driver Enable to Output Low t

Driver Disable Time from Low t

Driver Disable Time from High t

t

PDLH

t

PDHL

t

DR

t

DF

Figures 2 and 3,
R

= 54Ω, CL = 50pF

L

Figures 2 and 3,
R

= 54Ω, CL = 50pF

L

Figures 2 and 3,
R

DSKEW

MAX

PDZL

PDLZ

PDHZ

= 54Ω, CL = 50pF

L

= |t

t

DSKEW

PDLH

Figure 4,
R

= 500Ω, CL = 50pF

L

Figure 4,
R

= 500Ω, CL = 50pF

L

Figure 5,
R

= 500Ω, CL = 50pF

L

- t

PDHL

|

50

50

12.5

12.5

ns

ns

6ns

20 Mbps

100 ns

100 ns

100 ns

MAX3362

3.3V, High-Speed, RS-485/RS-422 Transceiver in
SOT Package

4 _______________________________________________________________________________________

Note 1: Devices production tested at +25°C. Over-temperature limits are guaranteed by design.
Note 2: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device

ground, unless otherwise noted.

Note 3: ∆V

OD

and ∆VOCare the changes in VODand VOC, respectively, when the DI input changes state.

Note 4: The short-circuit output current applies to peak current just prior to foldback-current limiting; the short-circuit foldback out-

put current applies during current limiting to allow a recovery from bus contention.

Note 5: Shutdown is enabled by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the device is

guaranteed not to enter shutdown. If the enable inputs are in this state for at least 600ns, the device is guaranteed to have
entered shutdown.

Note 6: Transition time from shutdown mode to normal operation.

SWITCHING CHARACTERISTICS (MAX3362E_ _ only) (continued)

(VCC= +3.3V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Driver Enable to Output High t

Receiver Propagation Delay

Receiver Output Skew t

Receiver Enable to Output Low t

Receiver Enable to Output High t

Receiver Disable Time from Low t

Receiver Disable Time from
High

Time to Shutdown t

Driver Enable from Output High
to Shutdown

Driver Enable from Output Low
to Shutdown

Receiver Enable from Output
High to Shutdown

Receiver Enable from Output
Low to Shutdown

Time to Normal Operation t

Driver Enable from Shutdown to
Output High

Driver Enable from Shutdown to
Output Low

Receiver Enable from Shutdown
to Output High

Receiver Enable from Shutdown
to Output Low

PDZH

t

PRLH

t

PRHL

RSKEW

PRZL

PRZH

PRLZ

t

PRHZ

SD

t

PDHS

t

PDLS

t

PRHS

t

PRLS

NO

t

PDSH

t

PDSL

t

PRSH

t

PRSL

Figure 5,
R

= 500Ω, CL = 50pF

L

Figure 6, CL = 15pF

Figure 6, CL = 15pF
t

= |t

RSKEW

Figure 7, RL = 1kΩ, C

Figure 7, RL = 1kΩ, C

Figure 7, RL = 1kΩ, C

Figure 7, RL = 1kΩ, C

PRLH

- t

|

PRHL

= 15pF 100 ns

L

= 15pF 100 ns

L

= 15pF 100 ns

L

= 15pF 100 ns

L

(Note 5) 50 600 ns

50 600 ns

50 600 ns

50 600 ns

50 600 ns

(Note 6) 1500 3000 ns

Figure 5
R

= 500Ω, CL = 50pF

L

Figure 4

= 500Ω, CL = 50pF

R

L

Figure 7

= 1kΩ, CL = 15pF

R

L

Figure 7

= 1kΩ, CL = 15pF

R

L

100 ns

50

50

6ns

1500 3000 ns

1500 3000 ns

1500 3000 ns

1500 3000 ns

ns

MAX3362

3.3V, High-Speed, RS-485/RS-422 Transceiver in
SOT Package

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(VCC= +3.3V, TA = +25°C, unless otherwise noted.)

0

10

5

20

15

35

30

25

40

0 1.00.5 1.5 2.0 2.5 3.0 3.5

OUTPUT CURRENT vs. RECEIVER OUTPUT

LOW VOLTAGE

MAX3362 toc01

RECEIVER OUTPUT LOW VOLTAGE (V)

OUTPUT CURRENT (mA)

-30

-20

-25

-10

-15

-5

0

0 1.5 2.00.5 1.0 2.5 3.0 3.5

OUTPUT CURRENT vs. RECEIVER OUTPUT

HIGH VOLTAGE

MAX3362 toc02

RECEIVER OUTPUT HIGH VOLTAGE (V)

OUTPUT CURRENT (mA)

3.22

3.23

3.25

3.24

3.26

-40 -10 5

35

50-25 65 80 95 110 125

RECEIVER OUTPUT HIGH VOLTAGE

vs. TEMPERATURE

MAX3362 toc03

TEMPERATURE (°C)

RECEIVER OUTPUT HIGH VOLTAGE (V)

20

0

0.01

0.02

0.03

0.04

0.05

-40 -10 5-25 20 35 50 65 80 95 110 125

RECEIVER OUTPUT LOW VOLTAGE

vs. TEMPERATURE

MAX3362 toc04

TEMPERATURE (°C)

RECEIVER OUTPUT LOW VOLTAGE (V)

DRIVER OUTPUT CURRENT

vs. DIFFERENTIAL OUTPUT VOLTAGE

MAX3362 toc05

DIFFERENTIAL OUTPUT VOLTAGE (V)

DRIVER OUTPUT CURRENT (mA)

3.23.02.82.62.4

15

30

45

60

75

0

2.2 3.4

DRIVER DIFFERENTIAL OUTPUT VOLTAGE

vs. TEMPERATURE

MAX3362 toc06

TEMPERATURE (°C)

DRIVER DIFFERENTIAL OUTPUT VOLTAGE (V)

1109580655035205-10-25

0.5

1.0

1.5

2.0

2.5

3.0

0

-40 125

RL = 54Ω

DRIVER OUTPUT CURRENT

vs. DRIVER OUTPUT LOW VOLTAGE

MAX3362 toc07

DRIVER OUTPUT LOW VOLTAGE (V)

DRIVER OUTPUT CURRENT (mA)

11108 92 3 4 5 6 71

10

20

30

40

50

60

70

80

90

100

110

120

130

0

012

DRIVER OUTPUT CURRENT

vs. DRIVER OUTPUT HIGH VOLTAGE

MAX3362 toc08

DRIVER OUTPUT HIGH VOLTAGE (V)

DRIVER OUTPUT CURRENT (mA)

431 2-5 -4 -3 -2 -1 0-6

-130

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

-140

-7 5

SUPPLY CURRENT vs. TEMPERATURE

MAX3362 toc09

TEMPERATURE (°C)

I

CC

(mA)

11095-25 -10 5 35 50 6520 80

1.69

1.70

1.71

1.72

1.73

1.74

1.75

1.76

1.68

-40 125