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MAX13448EESD+T

P1-P3P4-P6P7-P9P10-P12P13-P14
General Description
The MAX13448E full-duplex RS-485 transceiver fea-
tures inputs and outputs fault protected up to ±80V
(with respect to ground). The device operates from a
+3.0V to +5.5V supply and features true fail-safe cir-
cuitry, guaranteeing a logic-high receiver output when
the receiver inputs are open or shorted. This enables all
receiver outputs on a terminated bus to output logic-
high when all transmitters are disabled.
The MAX13448E features a slew-rate limited driver that
minimizes EMI and reduces reflections caused by
improperly terminated cables, allowing error-free data
transmission at data rates up to 500kbps with a +5V
supply, and 250kbps with a +3.3V supply.
The MAX13448E includes a hot-swap capability to elimi-
nate false transitions on the bus during power-up or hot
insertion. The driver and receiver feature active-high and
active-low enables, respectively, that can be connected
together externally to serve as a direction control.
The MAX13448E features an 1/8-unit load receiver input
impedance, allowing up to 256 transceivers on the bus.
All driver outputs are protected to ±8kV ESD using the
Human Body Model. The MAX13448E is available in a
14-pin SO package and operates over the extended
-40°C to +85°C temperature range.
Applications
Industrial Control Systems
HVAC Control systems
Utility Meters
Motor Driver Control Systems
Features
o ±80V Fault Protection on the RS-485 I/O Ports
o True Fail-Safe Receiver
o Hot-Swap Input Structure on DE
o ESD Protection on the RS-485 I/O Ports
±8kV Human Body Model
o Slew-Rate Limiting Facilitates Error-Free Data
Transmission
o 1/8-Unit Load Allows Up to 256 Transceivers on
the Bus
o -7V to +12V Common-Mode Input Voltage Range
o +3.0V to +5.5V Operating Supply Voltage
o Available in 14-Pin SO Package
MAX13448E
±80V Fault-Protected Full-Duplex
RS-485 Transceiver
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-4098; Rev 0; 5/08
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.
PART TEMP RANGE PIN-PACKAGE
MAX13448EESD+ -40°C to +85°C 14 SO
Pin Configuration appears at end of data sheet.
+
Denotes a lead-free package.
R
t
RE
RO
Y
Z
DI
9
10
A
B
R
t
12
11
6, 73
R
D
R
DI
D
DE
RE
RO
N.C.
R
D
DE
GND
GND
V
CC
1μF
141
SO
+
V
CC
N.C.
132 N.C.RO
123ARE
114BDE
105ZDI
96YGND
87 N.C.GND
1, 8,
13
2
5
414
V
CC
MAX13448E
Functional Diagram
MAX13448E
±80V Fault-Protected Full-Duplex
RS-485 Transceiver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0 to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.) (Notes 2, 3)
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 reference to GND.)
Supply Voltage (V
CC
).............................................................+6V
Control Input Voltage (RE, DE)...................-0.3V to (V
CC
+ 0.3V)
Driver Input Voltage (DI).............................-0.3V to (V
CC
+ 0.3V)
Receiver Input Voltage (A, B (Note 1)) ................................±80V
Driver Output Voltage (Y, Z (Note 1)) ..................................±80V
Receiver Output Voltage (RO)....................-0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration (RO, A, B) ...............................Continuous
Continuous Power Dissipation (T
A
= +70°C)
14-Pin SO (derate 8.3mW/°C above +70°C)................667mW
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
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
V
CC
Supply Voltage Range V
CC
3.0 5.5 V
N o l oad , D E , D I, RE = 0V or V
C C
, V
C C
= 3.3V 15
Supply Current I
Q
No load, DE, DI, RE = 0V or V
CC
, V
CC
= 5V 15
mA
DE = GND, RE = V
CC
, V
CC
= 3.3V 100
Supply Current in Shutdown
Mode
I
SHDN
DE = GND, RE = V
CC
, V
CC
= 5V 100
µA
DE = GND, RE = GND, short to +60V 15
Supply Current with Output
Shorted to ±60V
I
SHRT
DE = GND, RE = GND, short to -60V 15
mA
DRIVER
R
L
= 100Ω, Figure 1 2 V
CC
Differential Driver Output V
OD
R
L
= 54Ω, Figure 1 1.5 V
CC
V
Change in Magnitude of
Differential Output Voltage
ΔV
OD
R
L
= 100Ω or 54Ω, Figure 1 (Note 4) -0.2 0.2 V
Driver Common-Mode Output
Voltage
V
OC
RL = 100Ω or 54Ω, Figure 1 V
CC
/2 3 V
Change in Magnitude of
Common-Mode Voltage
ΔV
OC
RL = 100Ω or 54Ω, Figure 1 (Note 4) -0.2 +0.2 V
DI = low, 0V ≤ V
Y
or V
Z
≤ +12V +250
Driver Short-Circuit Output
Current
I
OSD
DI = high, -7V ≤ V
Y
or V
Z
≤ V
CC
(Note 5) -250
mA
DI = low, (V
CC
- 1V) ≤ V
Y
or V
Z
≤ +12V +10
Driver Short-Circuit Foldback
Output Current
I
OSDF
DI = high, -7V ≤ V
Y
or V
Z
≤ +1V -10
mA
V
Y
or V
Z
≥ + 22V, R
L
= 100Ω +6
Driver-Limit Short-Circuit
Foldback Output Current
I
OSDL
V
Y
or V
Z
≤ -13V, R
L
= 100Ω -6
mA
Driver Input High Voltage V
DIH
2V
Driver Input Low Voltage V
DIL
0.8 V
Driver Input Current I
DIN
-1 +1 µA
Note 1: If the RS-485 transmission lines are unterminated and a short to a voltage V
SHT
occurs at a remote point on the line, an active
local driver (with DI switching) may see higher voltage than V
SHT
due to inductive kickback at the driver. Terminating the line
with a resistor equal to its characteristic impedance minimizes this kickback effect.
MAX13448E
±80V Fault-Protected Full-Duplex
RS-485 Transceiver
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0 to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.) (Notes 2, 3)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
RECEIVER
V
A
, V
B
= +12V
V
CC
= GND or
V
CC
= +3.0V to +5.5V
+125 µA
V
A
, V
B
= -7V -100 µA
Input Current I
A
,
B
V
A
, V
B
= ±80V -6 +6 mA
Receiver Differential Threshold
Voltage
V
TH
-7V ≤ V
CM
≤ +12V -200 -50 mV
Receiver Input Hysteresis ΔV
TH
25 mV
Output High Voltage V
OH
I
OH
= -1.6mA
V
CC
-
0.6
V
Output Low Voltage V
OL
I
OL
= 1mA 0.4 V
Three-State Output Current at
Receiver
I
OZR
0 ≤ V
A
, V
B
≤ V
CC
-1 +1 µA
Receiver Output Short-Circuit
Current
I
OSR
0 ≤ V
RO
≤ V
CC
-95 +95 mA
ESD PROTECTION
All Pins Human Body Model ±2 kV
ESD Protection Level
(A and B, Y and Z)
Human Body Model ±8 kV
CONTROL
Control Input High Voltage V
CIH
DE, RE 2V
Control Input Low Voltage V
CIL
DE, RE 0.8 V
Input Current Latch During First
Rising Edge
I
IN
DE, RE 80 µA
PROTECTION SPECIFICATIONS
Overvoltage Protection A, B, Y, Z -80 +80 V
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
DRIVER
Driver Differential Propagation
Delay
t
DPLH
,
t
DPHL
R
L
= 54Ω, C
L
= 50pF, Figures 2 and 3 700 1500 ns
Driver Differential Output
Transition Time
t
LH
, t
HL
R
L
= 54Ω, C
L
= 50pF, Figures 2 and 3 250 1200 ns
Differential Driver Output Skew t
DSKEW
R
L
= 54Ω, C
L
= 50pF, t
DSKEW
= [t
DPLH
-
t
DPHL
], Figures 2 and 3
150 200 ns
Maximum Data Rate f
MAX
250 kbps
D r i ver E nab l e Ti m e to Outp ut H i g ht
DZH
R
L
= 500Ω, C
L
= 50pF, Figure 4 2000 ns
SWITCHING CHARACTERISTICS (V
CC
= +3.3V ±10%)
(T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.)
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX13448EESD+T

Mfr. #:
Buy MAX13448EESD+T
Manufacturer:
Maxim Integrated
Description:
RS-485 Interface IC Full-Dplx RS-422/485 500ksps 3-5.5V LD/Rc
Lifecycle:
New from this manufacturer.
Delivery:
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