General Description
The MAX13485E/MAX13486E +5V, half-duplex, ±15kV ESD-protected RS-485 transceivers feature one driver and one receiver. The 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 fal transitions on the bus during power-up or live-inrtion.
The MAX13485E features reduced slew-rate drivers that minimize EMI and reduce reflections caud 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. The 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
Features
o +5V Operation
o True Fail-Safe Receiver While Maintaining EIA/TIA-485 Compatibility
天灰sheo 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
MAX13485E/MAX13486E
Half-Duplex RS-485/RS-422 Transceivers in µDFN
________________________________________________________________Maxim Integrated Products 1
19-0742; Rev 0; 1/07
For pricing, delivery, and ordering information,plea contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at
Ordering Information/
Selector Guide
+Denotes a lead-free package.
Note: All devices are specified over the -40°C to +85°C operating temperature range.
Pin Configurations
M A X 13485E /M A X 13486E
2_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stress beyond tho listed under “Absolute Maximum Ratings” may cau permanent damage to the device. The are stress ratings only, and functional operation of the device at the or any other conditions beyond tho indicated in the operational ctions of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
(All voltages referenced to GND.)
V CC ........................................................................................+6V DE, RE , DI.................................................................-0.3V to +6V A, B..............................................................................-8V to 13V Short-Circuit Duration (RO, A, B) Continuous Continuous Power Dissipation (T A = +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW 8-Pin µDFN (derate 4.8mW/°C above +70°C)..........380.6mW
Operating Temperature Range ...........................-40°C to +85°C +150°C Storage
.-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS
(V CC = +5V ±5%, T A = T MIN to T MAX , unless otherwi noted. Typical values are at V CC = +5V and T A = +25°C.) (Notes 1, 2)
MAX13485E/MAX13486E
ELECTRICAL CHARACTERISTICS (continued)
(V CC = +5V ±5%, T A = T MIN to T MAX , unless otherwi noted. Typical values are at V CC = +5V and T A = +25°C.) (Notes 1, 2)
古典吉他教程(V CC = +5V ±5%, T A = T MIN to T MAX , unless otherwi noted. Typical values are at V CC = +5V and T A = +25°C.) (Note 1)
M A X 13485E /M A X 13486E
4_______________________________________________________________________________________
SWITCHING CHARACTERISTICS —MAX13485E (continued)
(V CC = +5V ±5%, T A = T MIN to T MAX , unless otherwi noted. Typical values are at V CC = +5V and T A = +25°C.) (Note 1)
SWITCHING CHARACTERISTICS —MAX13486E
MAX13485E/MAX13486E
_______________________________________________________________________________________5
SWITCHING CHARACTERISTICS —MAX13486E (continued)
(V CC = +5V ±5%, T A = T MIN to T MAX , unless otherwi noted. Typical values are at V CC = +5V and T A = +25°C.) (Note 1)
unless otherwi noted.
Note 3:∆V OD and ∆V OC are the changes in V OD
and V OC when the DI input changes states.
Note 4:The short-circuit output current applied to peak current just prior to foldback current limiting. The short-circuit foldback
output current applies during current limiting to allow a recovery from bus contention.网购服装最好的网站
Typical Operating Characteristics
(V CC = +5V, T A = +25°C, unless otherwi noted.)
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SUPPLY CURRENT vs. TEMPERATURE
TEMPERATURE (°C)
S U P P
L Y C U R R E N T (m A )
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14
28
35
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OUTPUT CURRENT vs. RECEIVER
OUTPUT HIGH VOLTAGE
OUTPUT HIGH VOLTAGE (V)
O U T P U T C U R R E N T (m A )
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OUTPUT CURRENT vs. RECEIVER
OUTPUT LOW VOLTAGE
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OUTPUT LOW VOLTAGE (V)
O U T P U T C U R R E N T (m A )
