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MAX3362 3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package 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 differen-
tial 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 receiv-
er 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
54
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 imped-
ance, 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 ther-
mal shutdown circuit protects against excessive power
dissipation.
The MAX3362 is available in an 8-pin SOT package
and specified over industrial and automotive tempera-
ture 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 3; 3/07
#Indicates an RoHS-compliant part.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxims website at www.maxim-ic.com.
PA RT
T EM P
R A NG E
PIN-
PA CK A G E
T O P
M A RK
PK G
C O DE
M AX3362E KA-T
- 40°C to + 85°C 8
SOT23-
8
AAJL
S 8-1
M AX3362AKA-T
- 40°C to + 125°C 8 SOT23- 8
AALL
S 8-1
M AX3362E KA#T - 40°C to + 85°C 8
SOT23-
8
#AEP H
S 8-1
M AX3362AKA#T - 40°C to + 125°C 8 SOT23- 8
#AEP P
S 8-1
MAX3362
DI
DE
RO
RE
RE
D
R
B
A
B
A
A
B
A
B
120 120 D
R
DI
DE
RO
RE
D
R
DI
DE
RO
D
R
DE
DI
RO
RE
Typical Operating Circuit
Pin Configuration and Functional Diagram appear at end of
data sheet. MAX3362
3.3V, High-Speed, RS-485/RS-422 Transceiver in
SOT Package
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.3V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +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
- V
B
|..................................................................................+8V
Receiver Output Voltage (RO)....................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +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
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DRIVER
Figure 1, R
L
= 100
(RS-422)
(extended temperature range)
2.0
Figure 1, R
L
= 100 (automotive temperature range)
1.5
Differential Driver Output
V
OD
Figure 1, R
L
= 54
(RS-485)
(extended temperature range)
1.5
V
Change in Magnitude of
Differential Output Voltage
V
OD
Figure 1, R
L
= 54
or 100
(Note 3)
0.2
V
Driver Common-Mode Output
Voltage
V
OC
Figure 1, R
L
= 54
or 100
3
V
Change In Magnitude of
Common-Mode Voltage
V
OC
Figure 1, R
L
= 54
or 100
(Note 3)
0.2
V
Input High Voltage
V
IH
DE, DI, RE
2.0
V
Input Low Voltage
V
IL
DE, DI, RE
0.8
V
Input Hysteresis
V
HYS
DE, DI, RE
50
mV
Input Current (DE, DI, RE)
I
IN
0
<
V
IN

<
5V
±1
µA
0
<
V
OUT

<
12V (Note 4)
+250
Driver Short-Circuit Output
Current
I
OSD
-7V
<
V
OUT

<
V
CC
(Note 4)
-250
mA
(V
CC
- 1V)
<
V
OUT

<
12V (Note 4)
+25
Driver Short-Circuit Foldback
Output Current
I
OSDF
-7V
<
V
OUT

<
1V (Note 4)
-25
mA MAX3362
3.3V, High-Speed, RS-485/RS-422 Transceiver in
SOT Package
_______________________________________________________________________________________
3
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.3V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.) (Notes 1, 2)
SWITCHING CHARACTERISTICS
(V
CC
= +3.3V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
t
PDLH
50
Driver Propagation Delay
t
PDHL
Figures 2 and 3,
R
L

= 54
, C
L
= 50pF
50
ns
t
DR
12.5
Driver Differential Output
Rise or Fall Time
t
DF
Figures 2 and 3,
R
L

= 54
, C
L
= 50pF
12.5
ns
Driver Output Skew
t
DSKEW
Figures 2 and 3,
R
L

= 54
, C
L
= 50pF
t
DSKEW
= |t
PDLH
- t
PDHL
|
6
ns
Maximum Data Rate
f
MAX
20
Mbps
Driver Enable to Output Low
t
PDZL
Figure 4,
R
L
= 500
, C
L
= 50pF
100
ns
Driver Disable Time from Low
t
PDLZ
Figure 4,
R
L
= 500
, C
L
= 50pF
100
ns
Driver Disable Time from High
t
PDHZ
Figure 5,
R
L
= 500
, C
L
= 50pF
100
ns
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Thermal Shutdown Threshold
V
TS
150
°C
Thermal Shutdown Hysteresis
V
TSH
10
°C
RECEIVER
Receiver Differential Threshold
Voltage
V
TH
-7V
<
V
CM

<
12V
-200
0
+200
mV
Receiver Input Hysteresis
V
TH
V
A
+ V
B
= 0
25
mV
Receiver Output High Voltage
V
OH
I
O
= -1mA, V
A
- V
B
= V
TH
V
CC
- 0.4
V
Receiver Output Low Voltage
V
OL
I
O
= 1mA, V
A
- V
B
= -V
TH
0.4
V
Three-State Output Current at
Receiver
I
OZR
0
<
V
O

<
V
CC
±1
µA
Receiver Input Resistance
R
IN
V
CM
= 12V
96
k V
IN
= +12V
125
Receiver Input Current
I
IN
DE = GND,
V
CC
= GND or 3.465V
V
IN
= -7V
-100
µA
Receiver Output Short-Circuit
Current
I
OSR
0
<
V
RO

<
V
CC
±150
mA
POWER SUPPLY
Supply Voltage
V
CC
3.135
3.300
3.465
V
Supply Current in Normal
Operation (Static Condition)
I
Q
No load, DI = V
CC
or GND
1.7
3
mA
Supply Current in Shutdown
Mode
I
SHDN
DE = GND, RE = V
CC
1
10
µA 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
V
OC
are the changes in V
OD
and V
OC
, 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 st