MAX14780EEPA+ Maxim Integrated, MAX14780EEPA+ Datasheet

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MAX14780EEPA+

Manufacturer Part Number
MAX14780EEPA+
Description
RS-422/RS-485 Interface IC PROFIBUS RS-485 Transceiver
Manufacturer
Maxim Integrated
Datasheet

Specifications of MAX14780EEPA+

Rohs
yes
Data Rate
500 Kbps
Operating Supply Voltage
5 V
Supply Current
1.8 mA
Operating Temperature Range
- 40 C to + 85 C
Number Of Drivers
1
Number Of Receivers
1
Product
RS-422/RS-485 Combination
19-5652; Rev 2; 10/11
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.
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.
Utility Meters
Lighting Systems
Industrial Control
Telecom
Security Systems
Instrumentation
Profibus
_______________________________________________________________ Maxim Integrated Products 1
+5.0V, ±30kV ESD-Protected, Fail-Safe,
General Description
Hot-Swap, RS-485/RS-422 Transceiver
RO
DE
RE
DI
1
2
3
4
+
D
R
Applications
8
7
6
5
TYPICAL HALF-DUPLEX OPERATING CIRCUIT
GND
V
CC
B
A
0.1µF
Rt
S +5.0V Operation
S Extended ESD Protection for RS-485/RS-422 I/O
S True Fail-Safe Receiver While Maintaining EIA/
S Hot-Swap Input Structures on DE and RE
S Enhanced Slew-Rate Limiting Facilitates Error-
S Low-Current Shutdown Mode
S Allow Up to 256 Transceivers on the Bus
S Available in Industry-Standard 8-Pin SO and PDIP
+Denotes a lead(Pb)-free/RoHS-compliant package.
MAX14780EESA+
MAX14780EEPA+
MAX14780E
Pins ±30kV Human Body Model
TIA-485 Compatibility
Free Data Transmission
Packages
PART
B
A
Rt
Typical Operating Circuit
Ordering Information
-40NC to +85NC
-40NC to +85NC
TEMP RANGE
R
D
DE
RE
DI
RO
PIN-PACKAGE
Features
8 PDIP
8 SO

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MAX14780EEPA+ Summary of contents

Page 1

... 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 PART MAX14780EESA+ MAX14780EEPA+ +Denotes a lead(Pb)-free/RoHS-compliant package. Typical Operating Circuit 0.1µF MAX14780E ...

Page 2

ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) Supply Voltage (V ) ........................................................... +6V CC Control Input Voltage (RE, DE) ...............................-0.3V to +6V Driver Input Voltage (DI) .........................................-0.3V to +6V Driver Output Voltage ...

Page 3

ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver DC ELECTRICAL CHARACTERISTICS (continued +5.0V ±10 MIN MAX PARAMETER SYMBOL RO Output-High Voltage RO Output-Low Voltage Three-State Output Current at Receiver Receiver Input Resistance ...

Page 4

ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver RECEIVER SWITCHING CHARACTERISTICS WITH INTERNAL SRL (500kbps +5.0V ±10 MIN MAX PARAMETER SYMBOL Receiver Propagation Delay Receiver Output Skew t RSKEW | ...

Page 5

ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver GENERATOR DZH DZH(SHDN) OUT Figure 4. Driver Enable and Disable Times (t GENERATOR DZL DZL(SHDN OUT V OL Figure 5. Driver Enable and ...

Page 6

ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver V ATE ID Figure 6. Receiver Propagation Delay Test Circuit +1.5V -1.5V S1 OPEN S2 CLOSED V = +1. OPEN S2 CLOSED V = +1. ...

Page 7

ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver (V = +5.0V +25°C, unless otherwise noted SUPPLY CURRENT vs. TEMPERATURE 1.60 NO LOAD 1.50 1.40 1. 1.00 0.90 0.80 ...

Page 8

ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver (V = +5.0V +25°C, unless otherwise noted SHUTDOWN CURRENT vs. TEMPERATURE -40 -25 - ...

Page 9

ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver PIN NAME 1 RO Receiver Output. When RE is low and -50mV high -200mV low. Receiver Output Enable. Drive ...

Page 10

ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver Detailed Description The MAX14780E high-speed transceiver for RS-485/ RS-422 communication contains one driver and one receiver. This device features fail-safe circuitry, which guarantees a logic-high receiver output when the receiv- er inputs are ...

Page 11

ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver CMOS input. Whenever V drops below 1V, the hot- CC swap input is reset. For RE there is a complementary circuit employing two pMOS devices pulling ±30kV ESD ...

Page 12

ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver 50MΩ TO 100MΩ 330Ω DISCHARGE CHARGE-CURRENT- RESISTANCE LIMIT RESISTOR HIGH- C STORAGE VOLTAGE s 150pF CAPACITOR DC SOURCE Figure 10c. IEC 61000-4-2 ESD Test Model Applications Information The standard ...

Page 13

ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver 120Ω MAX14780E Figure 11. Typical Half-Duplex RS-485 Network Typical Applications The MAX14780E transceiver is designed for bidirectional data communications on multipoint bus transmission lines. Figure ...

Page 14

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 14 2011 Maxim Integrated Products © ...

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