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MAX14780E_11

Description
5.0V, 30kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver
File Size2MB,14 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX14780E_11 Overview

5.0V, 30kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver

19-5652; Rev 1; 7/11
+5.0V, ±30kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceiver
General Description
The MAX14780E +5.0V, ±30kV ESD-protected, RS-485/
RS-422 transceiver features one driver and one receiver.
The device includes fail-safe circuitry, guaranteeing a
logic-high receiver output when receiver inputs are open
or shorted. The receiver outputs a logic-high if all trans-
mitters on a terminated bus are disabled (high imped-
ance). The MAX14780E includes a hot-swap capability
to eliminate false transitions on the bus during power-up
or hot insertion.
The MAX14780E features reduced slew-rate drivers that
minimize EMI and reduce reflections caused by improp-
erly terminated cables, allowing error-free data transmis-
sion up to 500kbps.
The MAX14780E is ideal for half-duplex communications
and it draws 1.2mA of supply current when unloaded
or when fully loaded with the drivers disabled. The
MAX14780E has a 1/8-unit load receiver input imped-
ance, allowing up to 256 transceivers on the bus.
The MAX14780E is available in an 8-pin SO and PDIP
packages.
S
+5.0V Operation
S
Extended ESD Protection for RS-485/RS-422 I/O
Pins ±30kV Human Body Model
S
True Fail-Safe Receiver While Maintaining EIA/
TIA-485 Compatibility
S
Hot-Swap Input Structures on DE and
RE
S
Enhanced Slew-Rate Limiting Facilitates Error-
Free Data Transmission
S
Low-Current Shutdown Mode
S
Allow Up to 256 Transceivers on the Bus
S
Available in Industry-Standard 8-Pin SO and PDIP
Packages
Features
MAX14780E
Applications
Utility Meters
Lighting Systems
Industrial Control
Telecom
Security Systems
Instrumentation
Profibus
PART
MAX14780EESA+
MAX14780EEPA+
Ordering Information
TEMP RANGE
-40NC to +85NC
-40NC to +85NC
PIN-PACKAGE
8 SO
8 PDIP
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
0.1µF
RO
RE
DE
DI
1
2
3
4
D
+
MAX14780E
DE
D
DI
R
8
7
6
5
V
CC
B
A
GND
Rt
B
Rt
A
R
RO
RE
TYPICAL HALF-DUPLEX OPERATING CIRCUIT
_______________________________________________________________
Maxim Integrated Products
1
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.

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