Anterwell Technology Ltd. |
|
3.3 V Slew Rate Limited, Half- and Full-Duplex,
RS-485/RS-422 Transceivers
ADM3483/ADM3485/ADM3488/ADM3490/ADM3491
FEATURES
Operate with 3.3 V supply
Interoperable with 5 V logic
EIA RS-422 and RS-485 compliant over full
common-mode range
Data rate options
ADM3483/ADM3488: 250 kbps
ADM3485/ADM3490/ADM3491: 10 Mbps
Half- and full-duplex options
Reduced slew rates for low EMI (ADM3483 and ADM3488)
2 nA supply current in shutdown mode (ADM3483/ADM3485/ADM3491)
Up to 32 transceivers on the bus
−7 V to +12 V bus common-mode range
Specified over the –40°C to +85°C temperature range
8 ns skew (ADM3485/ADM3490/ADM3491)
8-lead SOIC and 14-lead SOIC (ADM3491 only) packages
APPLICATIONS
Low power RS-485/RS-422 applications
Telecom
Industrial process control
HVAC
GENERAL DESCRIPTION
The ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 are low power, differential line transceivers designed to operate using a single 3.3 V power supply. Low power consumption, coupled with a shutdown mode, makes the ADM3483/ADM3485/ADM3488/ ADM3490/ADM3491 ideal for power-sensitive applications.
The ADM3488/ADM3490/ADM3491 feature full-duplex communication, while the ADM3483/ADM3485 are designed for half-duplex communication.
The ADM3483/ADM3488 feature slew rate limited drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250 kbps.
The ADM3485/ADM3490/ADM3491 transmit at up to 10 Mbps. The receiver input impedance is 12 kΩ, allowing up to 32 transceivers to be connected on the bus. A thermal shutdown circuit prevents excessive power dissipation caused by bus contention or by output shorting. If a significant temperature increase is detected in the internal driver circuitry during fault conditions, then the thermal shutdown circuit forces the driver output into a high impedance state. If the inputs are unconnected (floating), the receiver contains a fail-safe feature that results in a logic high output state. The parts are fully specified over the commercial and industrial temperature ranges. The ADM3483/ADM3485/ ADM3488/ADM3490 are available in 8-lead SOIC_N; the ADM3491 is available in a 14-lead SOIC_N.
FUNCTIONAL BLOCK DIAGRAMS
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Parameter | Rating |
---|---|
VCC to GND | 7 V |
Digital I/O Voltage (DE, RE, DI) | −0.3 V to VCC + 0.3 V |
Digital I/O Voltage (RO) | VCC − 0.5 V to VCC + 0.5 V |
Driver Output/Receiver Input Voltage | −7.5 V to +12.5 V |
Operating Temperature Range | −40°C to +85°C |
Storage Temperature Range | −65°C to +125°C |
θJA Thermal Impedance 8-Lead SOIC 14-Lead SOIC |
121°C/W 86°C/W |
Lead Temperature Soldering (10 sec) Vapor Phase (60 sec) Infrared (15 sec) |
300°C 215°C 220°C |
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Stock Offer (Hot Sell)
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