MAX13485E Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Half-Duplex RS-485/RS-422 Transceivers in uDFN

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.
Applications
Utility Meters
Industrial Controls
Industrial Motor Drives
Automated HVAC Systems
TOP VIEW
VCC
B
8
7
A GND
6
5
Features
o +5V Operation
o True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
o Hot-Swappable for Telecom Applications
o Enhanced Slew-Rate Limiting Facilitates Error-
Free Data Transmission (MAX13485E)
o High-Speed Version (MAX13488E) Allows for
Transmission Speeds Up to 16Mbps
o Extended ESD Protection for RS-485/RS-422 I/O
Pins ±15kV Using Human Body Model
o 1/4 Unit Load, Allowing Up to 128 Transceivers on
the Bus
o Available in Space-Saving 8-Pin µDFN or Industry
Standard 8-Pin SO Packages
Ordering Information/
Selector Guide
PART
PIN-
SLEW-RATE PKG
PACKAGE LIMITED
CODE
MAX13485EELA+T
MAX13485EESA+
MAX13486EELA+T
MAX13486EESA+
8 µDFN
8 SO
8 µDFN
8 SO
Yes
L822-1
Yes
S8-2
No
L822-1
No
S8-2
+Denotes a lead-free package.
Note: All devices are specified over the -40°C to +85°C operating
temperature range.
Pin Configurations
MAX13485E
MAX13486E
MAX13485E
MAX13486E
+
1
2
3
RO RE DE
DFN
+
RO 1 R
RE 2
DE 3
DI 4 D
4
DI
8 VCC
7B
6A
5 GND
RO
1
+
R
RE ²
DE ³
DI ⁴ D
SO
SO
0.1µF
8
VCC
7
B
Rt
6
5
A
GND
B
Rt
A
DE
D
DI
R
RO
RE
________________________________________________________________ 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.