19-0742; Rev 0; 1/07
Half-Duplex RS-485/RS-422 Transceivers in µDFN
General Description
The MAX13485E/MAX13486E +5V, half-duplex, ±15kV
ESD-protected RS-485 transceivers feature one driver
and one receiver. These devices include fail-safe circuitry,
guaranteeing a logic-high receiver output when receiver
inputs are open or shorted. The receiver outputs a logic-
high if all transmitters on a terminated bus are disabled
(high impedance). The MAX13485E/MAX13486E include
a hot-swap capability to eliminate false transitions on the
bus during power-up or live-insertion.
The MAX13485E features reduced slew-rate drivers
that minimize EMI and reduce reflections caused by
improperly terminated cables, allowing error-free trans-
mission up to 500kbps. The MAX13486E driver slew
rate is not limited, allowing transmit speeds up to
16Mbps.
The MAX13485E/MAX13486E feature a 1/4-unit load
receiver input impedance, allowing up to 128 transceivers
on the bus. These devices are intended for half-duplex
communications. All driver outputs are protected to ±15kV
ESD using the Human Body Model. The MAX13485E/
MAX13486E are available in 8-pin SO and space-saving
8-pin µDFN packages. The devices operate over the
extended -40°C to +85°C temperature range.
Features
♦
+5V Operation
♦
True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
♦
Hot-Swappable for Telecom Applications
♦
Enhanced Slew-Rate Limiting Facilitates Error-
Free Data Transmission (MAX13485E)
♦
High-Speed Version (MAX13486E) Allows for
Transmission Speeds Up to 16Mbps
♦
Extended ESD Protection for RS-485/RS-422 I/O
Pins ±15kV Using Human Body Model
♦
1/4 Unit Load, Allowing Up to 128 Transceivers on
the Bus
♦
Available in Space-Saving 8-Pin μDFN or Industry
Standard 8-Pin SO Packages
MAX13485E/MAX13486E
Ordering Information/
Selector Guide
PART
MAX13485EELA+T
MAX13485EESA+
MAX13486EELA+T
MAX13486EESA+
PIN-
PACKAGE
8 µDFN
8 SO
8 µDFN
8 SO
SLEW-RATE
LIMITED
Yes
Yes
No
No
PKG
CODE
L822-1
S8-2
L822-1
S8-2
Applications
Utility Meters
Industrial Controls
Industrial Motor Drives
Automated HVAC Systems
+Denotes
a lead-free package.
Note:
All devices are specified over the -40°C to +85°C operating
temperature range.
Pin Configurations
TOP VIEW
V
CC
8
B
7
A
6
GND
5
MAX13485E
MAX13486E
+
1
RO
2
RE
3
DE
4
DI
RO
RE
1
2
+
R
8
7
6
D
5
A
GND
B
Rt
Rt
A
0.1μF
V
CC
B
DE
D
DI
DFN
+
RO
RE
1
2
3
D
R
8
7
6
5
V
CC
B
A
GND
DE
3
4
DI
R
RO
SO
MAX13485E
MAX13486E
DE
RE
DI 4
SO
________________________________________________________________
Maxim Integrated Products
1
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.
Half-Duplex RS-485/RS-422 Transceivers in µDFN
MAX13485E/MAX13486E
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
V
CC
........................................................................................+6V
DE,
RE,
DI.................................................................-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 (derate 5.9mW/°C above +70°C)..................471mW
8-Pin µDFN (derate 4.8mW/°C above +70°C) ..........380.6mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Notes 1, 2)
PARAMETER
DRIVER
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 Short-Circuit Output
Current (Note 4)
Driver Short-Circuit Foldback
Output Current Note 3)
RECEIVER
Input Current (A and B)
Receiver-Differential-Threshold
Voltage
Receiver Input Hysteresis
Output-High Voltage
I
A, B
V
TH
ΔV
TH
V
OH
DE = GND, V
CC
= GND
or +5V
-7V < V
CM
< +12V
V
A
+ V
B
= 0V
I
O
= -1.6mA, V
A
- V
B
> V
TH
V
CC
-
1.5
V
IN
= +12V
V
IN
= -7V
-200
-200
25
-50
250
µA
mV
mV
V
V
OD
R
DIFF
= 54Ω, Figure 1
No load
ΔV
OD
V
OC
ΔV
OC
V
IH
V
IL
I
IN
I
OSD
I
OSDF
R
DIFF
= 100Ω or 54Ω, Figure 1 (Note 3)
R
DIFF
= 100Ω or 54Ω, Figure 1
R
DIFF
= 100Ω or 54Ω, Figure 1 (Note 3)
DI, DE,
RE
DI, DE,
RE
DI, DE,
RE
0V < V
OUT
< +12V
-7V < V
OUT
< 0V
(V
CC
- 1V) < V
OUT
< +12V
-7V < V
OUT
< 0V
+50
-250
20
-20
2.0
0.8
±1
+250
-50
V
CC
/2
2.0
1.5
V
CC
0.2
3
0.2
V
V
V
V
V
µA
mA
mA
V
CC
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Half-Duplex RS-485/RS-422 Transceivers in µDFN
ELECTRICAL CHARACTERISTICS (continued)
MAX13485E/MAX13486E
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Notes 1, 2)
PARAMETER
Output-Low Voltage
Tri-State Output Current at
Receiver
Receiver Input Resistance
Receiver-Output Short-Circuit
Current
POWER SUPPLY
Supply Voltage
Supply Current
Shutdown Supply Current
ESD PROTECTION
ESD Protection (A, B)
ESD Protection (All Other Pins)
Air Gap Discharge IEC61000-4-2
(MAX13485E)
Human Body Model
Human Body Model
±15
±15
±2
kV
kV
V
CC
I
CC
I
SHDN
DE = 1,
RE
= 0, no load
DE = 0,
RE
= 1
4.75
5.25
4.5
10
V
mA
µA
SYMBOL
V
OL
I
OZR
R
IN
I
OSR
CONDITIONS
I
O
= 1mA, V
A
- V
B
< -V
TH
0V < V
O
< V
CC
-7V < V
CM
< +12V
0V < V
RO
< V
CC
48
±7
±95
MIN
TYP
MAX
0.4
±1
UNITS
V
µA
kΩ
mA
SWITCHING CHARACTERISTICS—MAX13485E
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
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 to Output High
Driver Enable to Output Low
Driver Disable Time from High
Driver Disable Time from Low
Driver Enable from Shutdown to
Output High
Driver Enable from Shutdown to
Output Low
Time to Shutdown
RECEIVER
Receiver Propagation Delay
Receiver Output Skew
Maximum Data Rate
t
RPLH
t
RPHL
t
RSKEW
C
L
= 15pF, Figures 6 and 7
C
L
= 15pF, Figure 7
500
80
80
13
ns
ns
kbps
t
DZH
t
DZL
t
DHZ
t
DLZ
Figures 4 and 5
Figures 4 and 5
Figures 4 and 5
Figures 4 and 5
t
DPLH
t
DPHL
t
HL
t
LH
t
DSKEW
R
DIFF
= 54Ω, C
L
= 50pF, Figures 2 and 3
R
DIFF
= 54Ω, C
L
= 50pF, Figures 2 and 3
R
DIFF
= 54Ω, C
L
= 50pF, Figures 2 and 3
500
2500
2500
100
100
5500
5500
50
340
700
200
200
250
250
1000
1000
900
900
140
ns
ns
ns
kbps
ns
ns
ns
ns
ns
ns
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
t
DZH(SHDN)
Figures 4 and 5
t
DZL(SHDN)
Figures 4 and 5
t
SHDN
_______________________________________________________________________________________
3
Half-Duplex RS-485/RS-422 Transceivers in µDFN
MAX13485E/MAX13486E
SWITCHING CHARACTERISTICS—MAX13485E (continued)
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
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
Time to Shutdown
SYMBOL
t
RZH
t
RZL
t
RHZ
t
RLZ
Figure 8
Figure 8
Figure 8
Figure 8
CONDITIONS
MIN
TYP
MAX
50
50
50
50
2200
2200
50
340
700
UNITS
ns
ns
ns
ns
ns
ns
ns
t
RZH(SHDN)
Figure 8
t
RZL(SHDN)
Figure 8
t
SHDN
SWITCHING CHARACTERISTICS—MAX13486E
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
DRIVER
Driver Propagation Delay
Driver Differential Output Rise or
Fall Time
Differential Driver Output Skew
|t
DPLH
- t
DPHL
|
Maximum Data Rate
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from High
Driver Disable Time from Low
Driver Enable from Shutdown to
Output High
Driver Enable from Shutdown to
Output Low
Time to Shutdown
RECEIVER
Receiver Propagation Delay
Receiver Output Skew
Maximum Data Rate
t
RPLH
t
RPHL
t
RSKEW
C
L
= 15pF, Figures 6 and 7
C
L
= 15pF, Figure 7
16
80
80
13
ns
ns
Mbps
t
DZH
t
DZL
t
DHZ
t
DLZ
Figures 4 and 5
Figures 4 and 5
Figures 4 and 5
Figures 4 and 5
t
DPLH
t
DPHL
t
HL
t
LH
t
DSKEW
R
DIFF
= 54Ω, C
L
= 50pF, Figures 2 and 3
R
DIFF
= 54Ω, C
L
= 50pF, Figures 2 and 3
R
DIFF
= 54Ω, C
L
= 50pF, Figures 2 and 3
16
50
50
50
50
2200
2200
50
340
700
50
50
15
15
8
ns
ns
ns
Mbps
ns
ns
ns
ns
ns
ns
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
t
DZH(SHDN)
Figures 4 and 5
t
DZL(SHDN)
Figures 4 and 5
t
SHDN
4
_______________________________________________________________________________________
Half-Duplex RS-485/RS-422 Transceivers in µDFN
SWITCHING CHARACTERISTICS—MAX13486E (continued)
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
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
Time to Shutdown
SYMBOL
t
RZH
t
RZL
t
RHZ
t
RLZ
Figure 8
Figure 8
Figure 8
Figure 8
CONDITIONS
MIN
TYP
MAX
50
50
50
50
2200
2200
50
340
700
UNITS
ns
ns
ns
ns
ns
ns
ns
MAX13485E/MAX13486E
t
RZH(SHDN)
Figure 8
t
RZL(SHDN)
Figure 8
t
SHDN
Note 1:
µDFN devices production tested at +25°C. Overtemperature limits are generated by design.
Note 2:
All currents into the device are positive. All currents out of the device are negative. All voltages referred to device ground,
unless otherwise noted.
Note 3:
ΔV
OD
and
ΔV
OC
are the changes in V
OD
and V
OC
when the DI input changes states.
Note 4:
The short-circuit output current applied to peak current just prior to foldback current limiting. The short-circuit foldback
output current applies during current limiting to allow a recovery from bus contention.
Typical Operating Characteristics
(V
CC
= +5V, T
A
= +25°C, unless otherwise noted.)
OUTPUT CURRENT vs. RECEIVER
OUTPUT HIGH VOLTAGE
MAX13485-86E toc01
MAX13485-86E toc02
SUPPLY CURRENT vs. TEMPERATURE
4.0
NO LOAD
3.8
SUPPLY CURRENT (mA)
35
OUTPUT CURRENT vs. RECEIVER
OUTPUT LOW VOLTAGE
MAX13485-86E toc03
60
50
OUTPUT CURRENT (mA)
40
30
20
10
0
28
OUTPUT CURRENT (mA)
3.6
21
3.4
14
3.2
7
3.0
-40
-15
10
35
60
85
TEMPERATURE (°C)
0
0
1
2
3
4
5
OUTPUT HIGH VOLTAGE (V)
0
1
2
3
4
5
OUTPUT LOW VOLTAGE (V)
_______________________________________________________________________________________
5
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