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The Intersil ISL32x7xE are ±16.5kV IEC61000-4-2 ESD Protected, 3.0V to 5.5V powered, QUAD transmitters for balanced communication using the RS-422 standard. These drivers have very low output leakage currents (±10µA), so they present a low load to the RS-422 bus.

Driver (Tx) outputs are tri-statable, and incorporate a hot plug feature to keep them disabled during power-up and down. Versions are available with a common EN/EN (‘172 pinout), a two channel EN12/EN34 (‘174 pinout), or a versatile combination of individual and group channel enables (see Table 1).

The ISL32372E, ISL32374E utilize slew rate limited drivers which reduce EMI, and minimize reflections from improperly terminated transmission lines, or from unterminated stubs in multidrop and multipoint applications. Drivers on the other versions are not limited, so they can achieve the 10Mbps or 32Mbps data rates. All versions are offered in Industrial and Extended Industrial (-40°C to +125°C) temperature ranges.

A 50% smaller footprint (compared to the TSSOP) is available with the ISL32179E’s QFN package. This device also features a logic supply pin (V_L), that sets the switching points of the enable and DI inputs to be compatible with a lower supply voltage in mixed voltage systems. Two speed select pins allow the ISL32179E user to select from three slew rate options for 460kbps, 10Mbps, or 32Mbps data rates. Individual channel and group enable pins increase the ISL32179E’s flexibility.

Key Features

• IEC61000 ESD Protection on RS-422 Outputs: ±16.5kV
  • Class 3 ESD Level on all Other Pins: 12kV HBM
  • High Machine Model ESD Level on all Pins: 700V
• Wide Supply Range: 3.0V to 5.5V
• Specified for +125°C Operation
• Available in Industry Standard Pinouts (‘172/’174) or in a Space Saving QFN (ISL32179E) with Added Features
• Logic Supply Pin (VL) Eases Operation in Mixed Supply Systems (ISL32179E Only)
• User Selectable Data Rate (ISL32179E Only)
• Hot Plug - Tx Outputs Remain Three-state During Power-up and Power-Down
• Low Tx Leakage Allows > 256 Devices on the Bus
• High Data Rates: up to 32Mbps
• Low Quiescent Supply Current: 0.8mA (Max)
  • Low Shutdown Supply Current: 60µA
• Current Limiting and Thermal Shutdown for Driver Overload Protection
• Tri-statable Tx Outputs
• 5V Tolerant Logic Inputs When VCC ≤ 5V
• Pb-free (RoHS compliant)

Applications

• Telecom Equipment
• Motor Controllers / Encoders
• Programmable Logic controllers
• Industrial/Process Control Networks