Features 

• Operates With 3-V to 5.5-V VCC Supply
• Single-Chip and Single-Supply Interface
  for IBMPC/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