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The Intersil ISL83385E contains 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. 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 a manual powerdown function reduces 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. This device is fully compatible with 3.3V only systems, mixed 3.3V and 5.0V systems, and 5.0V only systems.

The single pin powerdown function (SHDN = 0) disables all the transmitters, while shutting down the charge pump to minimize supply current drain.

Table 1 summarizes the features of the ISL83385E, while Application Note AN9863 summarizes the features of each device comprising the 3V RS-232 family.

Key Features

• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
• Low Power, Pin Compatible Upgrade for MAX3385E
• Single SHDN Pin Disables Transmitters
• RS-232 Compatible Outputs at 2.7V
• Receivers Active in Powerdown
• 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
• Receiver Hysteresis For Improved Noise Immunity
• Very Low Supply Current 0.3mA
• Guaranteed Minimum Data Rate 250kbps
• Guaranteed Minimum Slew Rate 6V/µs
• Wide Power Supply Range Single +3V to +5.5V
• Low Supply Current in Powerdown State <1µA
• Pb-Free Plus Anneal Available (RoHS Compliant)

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