• Operates With 3-V to 5.5-V VCC Supply
• Single-Chip and Single-Supply Interface for IBM™ PC/AT™ Serial Port
• RS-232 Bus-Pin ESD Protection of ±15 kV Using Human-Body Model (HBM)
• Meets or Exceeds the Requirements of TIA/EIA-232-F and ITU V.28 Standards
• Three Drivers and Five Receivers
• Operates Up To 250 kbit/s
• Low Active Current: 300 μA Typical
• Low Standby Current: 1 μA Typical
• External Capacitors: 4 × 0.1 μF
• Accepts 5-V Logic Input With 3.3-V Supply
• Always-Active Noninverting Receiver Output (ROUT2B)
• Operating Temperature
  • MAX3243C: 0°C to 70°C
  • MAX3243I: –40°C to 85°C
• Serial-Mouse Driveability
• Auto-Powerdown Feature to Disable Driver Outputs When No Valid RS-232 Signal Is Sensed

• Battery-Powered Systems
• Tablets
• Notebooks
• Laptops
• Hand-Held Equipment

The MAX3243 device consists of three line drivers, five line receivers which is ideal for DE-9 DTE interface. ±15-kV ESD (HBM) protection pin to pin (serial- port connection pins, including GND). Flexible power features saves power automatically. Special outputs ROUT2B and INVALID are always enabled to allow checking for ring indicator and valid RS232 input.