ISL3259E_08 Datasheet, PDF (1/16 Pages) Intersil Corporation – ±15kV ESD Protected, 100Mbps, 5V, PROFIBUS®, Full Fail-safe, RS-485/RS-422 Transceivers

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Data Sheet
February 18, 2008
ISL3259E
FN6587.1
±15kV ESD Protected, 100Mbps, 5V,
PROFIBUS^®, Full Fail-safe,
RS-485/RS-422 Transceivers
Intersil’s ISL3259E is a ±15kV IEC61000 ESD Protected, 5V
powered, single transceiver that meets both the RS-485 and
RS-422 standards for balanced communication. It also
features the larger output voltage and higher data rate (up to
100Mbps) required by high speed PROFIBUS applications.
The low bus currents (+220µA/-150µA) present a “1/5 unit
load” to the RS-485 bus, thus allowing up to 160 transceivers
on the network without violating the RS-485 specification’s
load limit, and without using repeaters.
This transceiver requires a 5V supply, and delivers at least a
2.1V differential output voltage. This translates into better noise
immunity (data integrity), longer reach, or the ability to drive up
to six 120Ω terminations in “star” or other non-standard bus
topologies.
SCSI applications benefit from the ISL3259’s low receiver
and transmitter part-to-part skews, which make it perfect for
high speed parallel applications where large numbers of bits
must be simultaneously captured. The low bit-to-bit skew
eases the timing constraints on the data latching signal.
Receiver (Rx) inputs feature a “Full Fail-Safe” design, which
ensures a logic high Rx output if Rx inputs are floating,
shorted, or terminated but undriven. Rx outputs feature high
drive levels (typically >30mA @ V_OL = 1V) to ease the design
of optically isolated interfaces.
Hot Plug circuitry ensures that the Tx and Rx outputs remain
in a high impedance state while the power supply stabilizes.
Driver (Tx) outputs are short circuit protected, even for
voltages exceeding the power supply voltage. Additionally,
on-chip thermal shutdown circuitry disables the Tx outputs to
prevent damage if power dissipation becomes excessive.
Features
• IEC61000 ESD Protection on RS-485 I/O Pins . . . ±15kV
- Class 3 HBM ESD Level on all Other Pins . . . . . . >9kV
• Large Differential V_OUT . . . . . . . . . . . . . . . 2.8V into 54Ω
Better Noise Immunity, or Drive up to 6 Terminations
• Very High Data Rate . . . . . . . . . . . . . . . . up to 100Mbps
• 11/13ns (Max) Tx/Rx Propagation Delays; 1.5ns (Max)
Skew
• 1/5 Unit Load Allows up to 160 Devices on the Bus
• Full Fail-Safe (Open, Shorted, Terminated/Undriven)
Receiver
• High Rx I_OL to Drive Opto-Couplers for Isolated
Applications
• Hot Plug - Tx and Rx Outputs Remain Three-State During
Power-Up
• Low Quiescent Supply Current . . . . . . . . . . . . . . . . . 4mA
• Low Current Shutdown Mode. . . . . . . . . . . . . . . . . . . 1µA
• -7V to +12V Common Mode Input Voltage Range
• Three-State Rx and Tx Outputs
• Operates from a Single +5V Supply
• Current Limiting and Thermal Shutdown for Driver
Overload Protection
• Pb-Free (RoHS Compliant)
Applications
• PROFIBUS^® DP and FMS Networks
• SCSI “Fast 40” Drivers and Receivers
• Motor Controller/Position Encoder Systems
• Factory Automation
• Field Bus Networks
• Security Networks
• Building Environmental Control Systems
• Industrial/Process Control Networks
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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