TRS3227CDBR

The TRS3227 consists of one line driver, one line receiver, 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 1 Mbit/s in normal operating mode and a maximum of 30-V/μs driver output slew rate. This device also features a logic-level output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting. The TRS3227 achieves a 1-μA supply current using the auto-powerdown plus feature. This device automatically enters a low-power powerdown mode when the RS-232 cable is disconnected or the drivers of the connected peripherals are inactive for more than 30 s. It turns on again when it senses a valid transition at any driver or receiver input. Auto-powerdown saves power without changes to the existing BIOS or operating system. The TRS3227C is characterized for operation from 0°C to 70°C. The TRS3227I is characterized for operation from -40°C to 85°C.

Applications

• Battery-Powered, Hand-Held, and Portable Equipment
• PDAs and Palmtop PCs
• Notebooks, Sub-Notebooks, and Laptops
• Digital Cameras
• Mobile Phones and Wireless Devices

Key features

• Meets or Exceeds the Requirements of TIA/EIA-232-F and ITU v.28 Standards Operates With 3-V to 5.5-V Supply
• Operates at Least 1 Mbit/s
• Low Standby Current ... 1 μA Typ
• External Capacitors ... 4x0.1 μF
• Accepts 5-V Logic Input With 3.3-V Supply
• Designed to Be Interchangeable With industry Standard '3227 Devices
• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
• ESD Protection for RS-232 I/O Pins – ±15 kV – Human-Body Model ±8 kV – IEC61000-4-2, Contact Discharge – ±8 kV – IEC61000-4-2, Air-Gap Discharge
• Auto-Powerdown Plus Feature Automatically Disables Drivers for Power Savings
• Packaged in Plastic Shrink Small-Outline Package