MAX3223EIPWR UART Interface ICc RS-232 Interface IC 3-5V MultiCh Line Driver/Receiver

FEATURES

• ESD Protection for RS-232 Bus Pins

  • – ±15-kV Human-Body Model (HBM)

  • – ±8-kV IEC61000-4-2, Contact Discharge

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

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

• Operates With 3-V to 5.5-V VCC Supply

• Operates up to 500 kbit/s

• Two Drivers and Two Receivers

• Low Standby Current . . . 1 μA Typ

• External Capacitors . . . 4 × 0.1 μF

• Accepts 5-V Logic Input With 3.3-V Supply

• Alternative High-Speed Pin-Compatible Device (1 Mbit/s) for SNx5C3223E

  
  

APPLICATIONS

• Battery-Powered Systems

• PDAs

• Notebooks

• Laptops

• Palmtop PCs

• Hand-Held Equipment

  
  

DESCRIPTION/ORDERING INFORMATION

The MAX3223E 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.

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, the driver outputs are disabled. If FORCEOFF is set low and EN is high, both drivers and receivers are shut off, and the supply current is reduced to 1 mA. Disconnecting the serial port or turning off the peripheral drivers causes auto-powerdown 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 any receiver input. The INVALID output is used to notify the user if an RS-232 signal is present at any receiver input. INVALID is high (valid data) if any 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. INVALID is low (invalid data) if the receiver input voltage is between –0.3 V and 0.3 V for more than 30 μs. Refer to Figure 4 for receiver input levels.