TRS3237E

3V 至 5.5V 多通道 RS-232 1Mbit/s 线路驱动器/接收器

* 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 From 250 kbits/s to 1 Mbit/s

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Low Standby Current . . . 1 µA Typical

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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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Designed to Be Interchangeable With Industry Standard ’3237E Devices

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Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II

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ESD Protection for RS-232 I/O 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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APPLICATIONS

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Battery-Powered, Hand-Held, and Portable Equipment

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PDAs and Palmtop PCs

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Notebooks, Sub-Notebooks, and Laptops

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Digital Cameras

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Mobile Phones and Wireless Devices

## DESCRIPTION/ORDERING INFORMATION

The consists of five line drivers, three 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. This device operates at data signaling rates of 250 kbit/s in normal operating mode MBAUD = GND and 1Mbit/s when MBAUD = VCC. The driver output slew rate is a maximum of 30 V/µs.

The TRS3237E transmitters are disabled and the outputs are forced into high-impedance state when the device is in shutdown mode SHDN = GND and the supply current falls to less than 1 µA. Also, during shutdown, 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. ROUT1B remains active all the time, regardless of the EN and SHDN condition.

The TRS3237EC is characterized for operation from 0°C to 70°C. The TRS3237EI is characterized for operation from –40°C to 85°C.