MAX14780E_11 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – 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.
Utility Meters
Lighting Systems
Industrial Control
Telecom
Security Systems
Instrumentation
Profibus
Applications
Features
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
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX14780EESA+ -40NC to +85NC
8 SO
MAX14780EEPA+ -40NC to +85NC
8 PDIP
+Denotes a lead(Pb)-free/RoHS-compliant package.
+
RO ¹
R
RE ²
DE ³
DI ⁴ D
Typical Operating Circuit
0.1µF
8 _VCC
7
B
Rt
6
5
A
GND
MAX14780E
B
Rt
A
TYPICAL HALF-DUPLEX OPERATING CIRCUIT
DE
D
DI
R
RO
RE
________________________________________________________________ Maxim Integrated Products   1
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