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The Intersil ICL3221EM and ICL3221EF devices are 3.3V powered RS-232 transmitters/receivers which meet ElA/TIA-232 and V.28/V.24 specifications. Additionally, they provide ±15kV ESD protection (IEC61000-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver inputs (RS-232 pins). Efficient on-chip charge pumps, coupled with manual and automatic power-down functions, reduce the standby supply current to a 1μA trickle. Small footprint packaging, and the use of small, low value capacitors ensure board space savings as well. Data rates greater than 250kbps are guaranteed at worst case load conditions. These devices are fully compatible with 3.3V-only systems.

The ICL3221EM and ICL3221EF feature an automatic powerdown function, which powers down the on-chip power-supply and driver circuits. This occurs when an attached peripheral device is shut off or the RS-232 cable is removed, conserving system power automatically without changes to the hardware or operating system. These devices power up again when a valid RS-232 voltage is applied to any receiver input.

Key Features

• ESD protection for RS-232 I/O pins to ±15kV (IEC61000)
• RS-232 compatible with VCC = 2.7V
• Meets EIA/TIA-232 and V.28/V.24 specifications at 3V
• Latch-up free
• On-chip voltage converters require only four external 0.1μF capacitors
• Manual and automatic power-down features
• Receiver hysteresis for improved noise immunity
• Guaranteed minimum data rate: 250kbps
• Power supply range: single +3.0V to +3.6V
• Low supply current in power-down state: 1μA
• Pb-free (RoHS compliant)

Applications

• Any system requiring RS-232 communication ports
  • Battery powered, hand-held, and portable equipment
  • Modems, printers, and other peripherals