The SN65C3221 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). This device 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 up to 1 Mbit/s and a driver output slew rate of 24 V/µs to 150 V/µs.

Flexible control options for power management are available when the serial port is inactive. The auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid RS-232 signal on the receiver input, the driver output is disabled. If FORCEOFF is set low and EN is high, both the driver and receiver are shut off, and the supply current is reduced to 1 µA. Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high. With auto-powerdown enabled, the device is activated automatically when a valid signal is applied to the receiver input. The INVAILD output notifies the user if an RS-232 signal is present at the receiver input. INVAILD is high (valid data) if the receiver input voltage is greater than 2.7 V or less than –2.7 V, or has been between -0.3 V and 0.3 V for less than 30 µs. INVAILD is low (invalid data) if the receiver input voltage is between -0.3 V and 0.3 V for more than 30 µs.

• Qualified for Automotive Applications
• Operates With 3-V to 5.5-V VCC Supply
• Operates Up To 1 Mbit/s
• Low Standby Current . . . 1 µA Typical
• External Capacitors . . . 4 × 0.1 µF
• Accepts 5-V Logic Input With 3.3-V Supply
• RS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM)
• Auto-Powerdown Feature Automatically Disables Drivers for Power Savings
• Applications
  • Battery-Powered, Hand-Held, and Portable Equipment
  • PDAs and Palmtop PCs
  • Notebooks, Sub-Notebooks, and Laptops
  • Digital Cameras
  • Mobile Phones and Wireless Devices