MAX13448E Datasheet, PDF (1/14 Pages) Maxim Integrated Products – 80V Fault-Protected Full-Duplex RS-485 Transceiver

19-4098; Rev 0; 5/08
±80V Fault-Protected Full-Duplex
RS-485 Transceiver
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
Ordering Information
PART
TEMP RANGE
MAX13448EESD+ -40°C to +85°C
+Denotes a lead-free package.
PIN-PACKAGE
14 SO
Pin Configuration appears at end of data sheet.
Functional Diagram
N.C. 1 ⁺
RO 2
R
RE 3
DE 4
DI 5
D
GND 6
GND 7
SO
MAX13448E
14 V_CC
13 N.C.
12 A
5
DI
11 B
10 Z
9Y
8 N.C.
2
RO
1, 8,
13
N.C.
DE ^VCC
4 14
9
D
10
12
R
11
3
6, 7
RE
GND
1μF
Y
Z
A
R_t
B
V_CC RE
R_t
R
RO
D
DI
GND DE
________________________________________________________________ Maxim Integrated Products 1
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