19-1058; Rev 1; 8/09
RS-485 Transceiver with Integrated Low-Dropout
Regulator and AutoDirection Control
General Description
The MAX13410E–MAX13415E are half-duplex RS-485-/RS-
422-compatible transceivers optimized for isolated appli-
cations. These devices feature an internal low-dropout
regulator (LDO), one driver, and one receiver. The inter-
nal LDO allows the part to operate from an unregulated
power supply of up to 28V. The AutoDirection feature
reduces the number of optical isolators needed in isolat-
ed applications. Other features include enhanced ESD
protection, fail-safe circuitry, slew-rate limiting, and full-
speed operation.
The MAX13410E–MAX13415E internal LDO generates a
5V ±10% power supply that is used to power its internal
circuitry. The MAX13412E–MAX13415E bring the 5V to an
output V
REG
that allows the user to power additional
external circuitry with up to 20mA to further reduce exter-
nal components. The MAX13410E/MAX13411E do not
have a 5V output and come in industry-compatible
pinouts. This allows easy replacement in existing designs.
The MAX13410E–MAX13415E feature a 1/8-unit load
receiver input impedance, allowing up to 256 trans-
ceivers on the bus. All driver outputs are ESD protected
using the Human Body Model. These devices also
include fail-safe circuitry (MAX13410E/MAX13411E/
MAX13414E/MAX13415E only), guaranteeing a logic-
high receiver output when the receiver inputs are open
or shorted. The receiver outputs a logic-high when the
transmitter on the terminated bus is disabled (high
impedance).
The MAX13412E/MAX13413E feature Maxim’s propri-
etary AutoDirection control. This architecture eliminates
the need for the DE and
RE
control signals. In isolated
applications, this reduces the cost and size of the sys-
tem by reducing the number of optical isolators required.
The MAX13410E/MAX13412E/MAX13414E feature
reduced slew-rate drivers that minimize EMI and reduce
reflections caused by improperly terminated cables,
allowing error-free transmission up to 500kbps. The
MAX13411E/MAX13413E/MAX13415E are not slew-rate
limited, allowing transmit speeds up to 16Mbps.
The MAX13410E–MAX13415E are available in an 8-pin
SO package with an exposed paddle to improve power
dissipation, and operate over the extended -40°C to
+85°C temperature range.
Features
♦
Wide +6V to +28V Input Supply Range
♦
+5V Output Supplies Up to 20mA to External
Circuitry
♦
Internal LDO
♦
Low 65µA (typ) Shutdown Supply Current
♦
Extended ESD Protection
±15kV Human Body Model (MAX13412E/
MAX13413E)
±14kV Human Body Model (MAX13410E/
MAX13411E)
♦
1/8-Unit Load, Allowing Up to 256 Transceivers on
the Bus
♦
-40°C to +85°C Operating Temperature Range
♦
Fail-Safe
♦
Slew-Rate Limited and Full-Speed Versions
♦
Up to 16Mbps Data Rate on Full-Speed Versions
MAX13410E–MAX13415E
Applications
Isolated RS-485 Interfaces
-
Utility Meters
Industrial Equipment
Telecomm Equipment
Pin Configurations
TOP VIEW
RO
RE
DE
1
2
3
+
8
7
V
CC
B
A
GND
MAX13410E
MAX13411E
*EP
6
5
DI 4
SO
*EXPOSED PAD CONNECTED TO GROUND
Pin Configurations continued at end of data sheet.
Ordering Information/Selector Guide
PART
MAX13410EESA+
MAX13411EESA+
PIN-PACKAGE
8 SO-EP*
8 SO-EP*
AutoDirection
No
No
DATA RATE (max)
500kbps
16Mbps
5V LDO OUTPUT
No
No
Note:
All devices operate over the -40°C to +85°C operating
temperature range.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Ordering Information/Selector Guide continued at end of data
sheet.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
RS-485 Transceiver with Integrated Low-Dropout
Regulator and AutoDirection Control
MAX13410E–MAX13415E
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
V
CC
.........................................................................-0.3V to +30V
RE,
DE/RE, DE, DI, RO, V
REG
..................................-0.3V to +6V
A, B............................................................................-8V to +13V
Short-Circuit Duration (RO, A, B) to GND ................. Continuous
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO-EP (derate 19.2mW/°C above +70°C) ........1539mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range ............................-65°C to +150°C
Junction Temperature ......................................................+150°C
θ
JA
(Note 1)...................................................................52.0°C/W
θ
JC
(Note 1).....................................................................6.0°C/W
Lead Temperature (soldering, 10s) ................................+300°C
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specificactions JESD51-7 using a four layer board.
For detailed information on package consitencies refer to www.maxim-ic/thermal-tutorial.
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= +6.0V to +28V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +7.5V, C
S
= 1µF, and T
A
= +25°C.) (Note 2)
PARAMETER
Supply Voltage
LDO Output Voltage
LDO Output Current
LDO Dropout Voltage
Minimum Bypass Capacitor on V
REG
SYMBOL
V
CC
V
REG
I
REG
V
DO
C
S
(Note 3)
V
CC
= +7.5V, I
LOAD
= 20mA
V
CC
= +28V, I
LOAD
= 0mA
V
CC
> +7.5V
V
CC
= +5V, I
OUT
= 20mA
Guaranteed by design,
MAX13412E–MAX13415E
RE,
DE = high/no load
(MAX13410E/MAX13411E)
Supply Current
I
CC
RE,
DE/RE = high, DI = low/no load
(MAX13412E–MAX13415E)
DE = low,
RE
= high
(MAX13410E/MAX13411E)
45
+150
15
1
10
mA
10
µA
°C
°C
0.5
CONDITIONS
MIN
6.0
4.5
4.5
5
5
TYP
MAX
28.0
5.5
5.5
20
UNITS
V
V
mA
V
µF
Shutdown Current
Thermal-Shutdown Threshold
Thermal-Shutdown Threshold
Hysteresis
DRIVER
I
SHDN
T
TS
T
TSH
R
DIFF
= 100Ω, Figure 1
Differential Driver Output
Change in Magnitude of Differential
Output Voltage
Driver Common-Mode Output Voltage
Change In Magnitude of Common-
Mode Voltage
Input High Voltage
Input Low Voltage
Input Current
Driver-Disable Threshold
V
OD
R
DIFF
= 54Ω, Figure 1
No load
ΔV
OD
V
OC
ΔV
OC
V
IH
V
IL
I
IN
V
DT
R
DIFF
= 100Ω or 54Ω, Figure 1
R
DIFF
= 100Ω or 54Ω, Figure 1
R
DIFF
= 100Ω or 54Ω, Figure 1
DI, DE,
RE,
DE/RE
DI, DE,
RE,
DE/RE
DI, DE,
RE,
DE/RE
T
A
= +25°C (MAX13412E/MAX13413E)
2.0
1.5
5.5
5.5
5.5
0.2
V
V
V
V
0.8
±1
V
µA
V
V
1
3
0.2
2.0
0.6
1.0
2
_______________________________________________________________________________________
RS-485 Transceiver with Integrated Low-Dropout
Regulator and AutoDirection Control
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +6.0V to +28V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +7.5V, C
S
= 1µF, and T
A
= +25°C.) (Note 2)
PARAMETER
Driver Short-Circuit Output Current
Driver Short-Circuit-Foldback Output
Current
RECEIVER
Input Current (A and B)
I
A, B
RE,
DE, DE/RE =
GND, V
CC
= GND
V
IN
= +12V
V
IN
= -7V
-100
-200
-100
15
V
REG
- 0.6
0.4
0.01
96
±8
±95
±1
-50
mV
100
mV
V
V
µA
kΩ
mA
125
µA
SYMBOL
I
OSD
I
OSDF
CONDITIONS
0V < V
OUT
< +12V
-7V < V
OUT
< 0V
(V
CC
- 1V) < V
OUT
< +12V
-7V < V
OUT
< 0V
-250
20
-20
MIN
TYP
MAX
+250
UNITS
mA
mA
MAX13410E–MAX13415E
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
Output High Voltage
Output Low Voltage
Three-State Output Current at Receiver
Receiver-Input Resistance
Receiver-Output Short-Circuit Current
ESD PROTECTION
ESD Protection (A, B)
ESD Protection (A, B)
ESD Protection (All Other Pins)
V
TH
-7V < V
CM
< +12V
(MAX13410E/MAX13411E)
-7V < V
LM
< +12V
(MAX13412E/MAX13413E)
V
A
+ V
B
= 0V
I
O
= -1mA, V
A
- V
B
> V
TH
I
O
= +1mA, V
A
- V
B
< -V
TH
0 < V
O
< V
REG
-7V < V
CM
< +12V
0V < V
RO
< V
REG
Human Body Model
(MAX13412E/MAX13413E)
Human Body Model
(MAX13410E/MAX13411E)
Human Body Model
ΔV
TH
V
OH
V
OL
I
OZR
R
IN
I
OSR
±15
±14
±2
kV
kV
kV
SWITCHING CHARACTERISTICS–MAX13410E
(V
CC
= +6.0V to +28V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +7.5V, C
S
= 1µF, and T
A
= +25°C.) (Note 2)
PARAMETER
DRIVER
Driver Propagation Delay
Driver Differential Output
Rise or Fall Time
Driver Differential Output Skew
|t
DPLH
- t
DPHL
|
Maximum Data Rate
Driver Enable from Shutdown to
Output High
Driver Enable from Shutdown to
Output Low
t
DPLH
t
DPHL
t
HL
t
LH
t
DSKEW
f
MAX
t
DZH(SHDN)
t
DZL(SHDN)
S2 closed, Figure 4,
R
L
= 500Ω, C
L
= 100pF
S2 closed, Figure 4,
R
L
= 500Ω, C
L
= 100pF
R
DIFF
= 54Ω, C
L
= 50pF,
Figures 2a and 3a
R
DIFF
= 54Ω, C
L
= 50pF,
Figures 2a and 3a
R
DIFF
= 54Ω, C
L
= 50pF,
Figures 2a and 3a
500
11
6
150
150
250
250
1000
1000
900
900
140
ns
ns
ns
kbps
µs
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
_______________________________________________________________________________________
3
RS-485 Transceiver with Integrated Low-Dropout
Regulator and AutoDirection Control
MAX13410E–MAX13415E
SWITCHING CHARACTERISTICS–MAX13410E (continued)
(V
CC
= +6.0V to +28V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +7.5V, C
S
= 1µF, and T
A
= +25°C.) (Note 2)
PARAMETER
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
Time to Shutdown
RECEIVER
Receiver Propagation Delay
Receiver Output Skew
Maximum Data Rate
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable Time from High
Receiver Disable Time from Low
Receiver Enable from Shutdown to
Output High
Receiver Enable from Shutdown to
Output Low
t
RPLH
t
RPHL
t
RSKEW
f
MAX
t
RZH
t
RZL
t
RZH
t
RLZ
S2 closed, Figure 7, C
L
= 15pF
S1 closed, Figure 7, C
L
= 15pF
S2 closed, Figure 7, C
L
= 15pF
S1 closed, Figure 7, C
L
= 15pF
C
L
= 15pF (at RO), Figures 5 and 6
C
L
= 15pF (at RO), Figures 5 and 6
500
50
50
50
50
14
3.5
200
200
30
ns
ns
kbps
ns
ns
ns
ns
µs
µs
SYMBOL
t
DZH
t
DZL
t
DHZ
t
DLZ
t
SHDN
CONDITIONS
S2 closed, Figure 4,
R
L
= 500Ω, C
L
= 100pF
S1 closed, Figure 4,
R
L
= 500Ω, C
L
= 100pF
S2 closed, Figure 4,
R
L
= 500Ω, C
L
= 100pF
S1 closed, Figure 4,
R
L
= 500Ω, C
L
= 100pF
50
340
MIN
TYP
MAX
2500
2500
100
100
700
UNITS
ns
ns
ns
ns
ns
t
RZH(SHDN)
S2 closed, Figure 7, C
L
= 15pF
t
RZL(SHDN)
S1 closed, Figure 7, C
L
= 15pF
SWITCHING CHARACTERISTICS–MAX13411E
(V
CC
= +6.0V to +28V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +7.5V, C
S
= 1µF, and T
A
= +25°C.) (Note 2)
PARAMETER
DRIVER
Driver Propagation Delay
Driver Differential Output
Rise or Fall Time
Driver Differential Output Skew
|t
DPLH
- t
DPHL
|
Maximum Data Rate
Driver Enable from Shutdown to
Output High
Driver Enable from Shutdown to
Output Low
Driver Enable to Output High
t
DPLH
t
DPHL
t
HL
t
LH
t
DSKEW
f
MAX
t
DZH(SHDN)
t
DZL(SHDN)
t
DZH
S2 closed, Figure 4,
R
L
= 500Ω, C
L
= 100pF
S2 closed, Figure 4,
R
L
= 500Ω, C
L
= 100pF
S2 closed, Figure 4,
R
L
= 500Ω, C
L
= 100pF
R
DIFF
= 54Ω, C
L
= 50pF, Figures 2a
and 3a
R
DIFF
= 54Ω, C
L
= 50pF, Figures 2a
and 3a
R
DIFF
= 54Ω, C
L
= 50pF, Figures 2a
and 3a
16
11
6
70
50
50
15
15
8
ns
ns
ns
Mbps
µs
µs
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4
_______________________________________________________________________________________
RS-485 Transceiver with Integrated Low-Dropout
Regulator and AutoDirection Control
SWITCHING CHARACTERISTICS–MAX13411E (continued)
(V
CC
= +6.0V to +28V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +7.5V, C
S
= 1µF, and T
A
= +25°C.) (Note 2)
PARAMETER
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
RECEIVER
Receiver Propagation Delay
Receiver Output Skew
Maximum Data Rate
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable Time from High
Receiver Disable Time from Low
Receiver Enable from Shutdown to
Output High
Receiver Enable from Shutdown to
Output Low
t
RPLH
t
RPHL
t
RSKEW
f
MAX
t
RZH
t
RZL
t
RZH
t
RLZ
S2 closed, Figure 7, C
L
= 15pF
S1 closed, Figure 7, C
L
= 15pF
S2 closed, Figure 7 , C
L
= 15pF
S1 closed, Figure 7, C
L
= 15pF
C
L
= 15pF (at RO), Figures 5 and 6
C
L
= 15pF (at RO), Figures 5 and 6
16
50
50
50
50
14
3.5
75
75
8
ns
ns
Mbps
ns
ns
ns
ns
µs
µs
SYMBOL
t
DZL
t
DHZ
t
DLZ
CONDITIONS
S1 closed, Figure 4,
R
L
= 500Ω, C
L
= 100pF
S2 closed, Figure 4,
R
L
= 500Ω, C
L
= 100pF
S1 closed, Figure 4,
R
L
= 500Ω, C
L
= 100pF
MIN
TYP
MAX
70
50
50
UNITS
ns
ns
ns
MAX13410E–MAX13415E
t
RZH(SHDN)
S2 closed, Figure 7, C
L
= 15pF
t
RZL(SHDN)
S1 closed, Figure 7, C
L
= 15pF
SWITCHING CHARACTERISTICS–MAX13412E
(V
CC
= +6.0V to +28V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +7.5V, C
S
= 1µF, and T
A
= +25°C.) (Note 2)
PARAMETER
DRIVER
Driver Propagation Delay
Driver Differential Output
Rise or Fall Time
Maximum Data Rate
Driver Disable Delay
RECEIVER
Receiver Propagation Delay
Receiver Output Skew
Maximum Data Rate
Receiver Enable to Output High
Receiver Enable to Output Low
t
RPLH
t
RPHL
t
RSKEW
f
MAX
t
RZH
t
RZL
S2 closed, Figure 7, C
L
= 15pF
S1 closed, Figure 7, C
L
= 15pF
C
L
= 15pF, Figures 5 and 6
C
L
= 15pF, Figures 5 and 6
500
50
50
200
200
30
ns
ns
kbps
ns
ns
t
DPLH
t
DPHL
t
HL
t
LH
f
MAX
t
DDD
R
L
= 110Ω, C
L
= 50pF, Figure 3b
R
L
= 110Ω, C
L
= 50pF, Figures 2b
and 3b
R
L
= 110Ω, C
L
= 50pF, Figures 2b
and 3b
200
200
250
250
500
2500
1000
1000
900
900
ns
ns
kbps
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
_______________________________________________________________________________________
5
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