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The Intersil ICL3225E, ICL3227E, and ICL3245E devices are 3.0V to 5.5V powered RS-232 transmitters/receivers which meet ElA/TIA-232 and V.28/V.24 specifications, even at V_CC = 3.0V. Additionally, they provide ±15kV ESD protection (IEC61000-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver inputs (RS-232 pins). Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low operational, and even lower standby, power consumption is critical. Efficient on-chip charge pumps, coupled with manual and enhanced automatic powerdown 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 1Mbps are guaranteed at worst case load conditions. This family is fully compatible with 3.3V only systems, mixed 3.3V and 5.0V systems, and 5.0V only systems.

The ICL3245E is a 3-driver, 5-receiver device that provides a complete serial port suitable for laptop or notebook computers. It also includes a noninverting always-active receiver for “wake-up” capability.

These devices feature an enhanced automatic powerdown function, which powers down the on-chip power supply and driver circuits. This occurs when all receiver and transmitter inputs detect no signal transitions for a period of 30s. These devices power back up automatically, whenever they sense a transition on any transmitter or receiver input.

Key Features

• Pb-free (RoHS compliant)
• ESD protection for RS-232 I/O pins to ±15kV (IEC61000)
• Manual and enhanced automatic powerdown features
• Drop in replacements for MAX3225E, MAX3227E, MAX3245E
• 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
• Guaranteed mouse driveability (ICL3245E)
• “Ready to Transmit” indicator output (ICL3225E/ICL3227E)
• Receiver hysteresis for improved noise immunity
• Guaranteed minimum data rate: 1Mbps
• Low skew at transmitter/receiver input trip points: 10ns
• Guaranteed minimum slew rate: 24V/μs
• Wide power supply range: single +3V to +5.5V
• Low supply current in powerdown state: 1μA

Applications

• Any system requiring RS-232 communication ports
  • Battery powered, hand-held, and portable equipment
  • Laptop computers, notebooks, palmtops
  • Modems, printers, and other peripherals
  • Digital cameras
  • Cellular/mobile phones