TRS3222E

具有 +/-15kV ESD 保护的 3V 至 5.5V 多通道 RS-232 线路驱动器/接收器

* ESD Protection for RS-232 Bus Pins

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±15-kV Human-Body Model HBM

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±8-kV IEC61000-4-2, Contact Discharge

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±15-kV IEC61000-4-2, Air-Gap Discharge

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Meets or Exceeds the Requirements of A/EIA-232-F and ITU v.28 Standards

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Operates With 3-V to 5.5-V VCC Supply

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Operates up to 500 kbit/s

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Two Drivers and Two Receivers

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Low Standby Current . . . 1 µA Typ

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External Capacitors . . . 4 × 0.1 µF

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Accepts 5-V Logic Input With 3.3-V Supply

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Alternative High-Speed Pin-Compatible Device 1 Mbit/s for

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APPLICATIONS

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Battery-Powered Systems

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PDAs

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Notebooks

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Laptops

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Palmtop PCs

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Hand-Held Equipment

## DESCRIPTION/ORDERING INFORMATION

The TRS3222E consists of two line drivers, two line receivers, and a dual charge-pump circuit with ±15-kV ESD protection pin to pin serial-port connection pins, including GND.

The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. The device operates at typical data signaling rates up to 500 kbit/s and a maximum of 30-V/µs driver output slew rate.

The TRS3222E can be placed in the power-down mode by setting the power-down PWRDOWN input low, which draws only 1 µA from the power supply. When the device is powered down, the receivers remain active while the drivers are placed in the high-impedance state. Also, during power down, the onboard charge pump is disabled; V+ is lowered to VCC, and V– is raised toward GND. Receiver outputs also can be placed in the high-impedance state by setting enable EN high.