This is one of the semiconductor types.
The MAX232CPE of line drivers/receivers is intended for all EIA/TIA-232E and V.28/V.24 communications interface.
Part number : MAX232CPE
Functions : +5V-Powered, Multichannel RS-232 Drivers/Receiver
Package information : 16 Pin DIP Type
Manufacturer : Maxim Integrated
The MAX220 Thru MAX249 family of line drivers/receivers is intended for all EIA/TIA-232E and V.28/V.24 communications interfaces, particularly applications where ±12V is not available.
These parts are especially useful in battery-powered systems, since their low-power shutdown mode reduces power dissipation to less than 5µW. The MAX225, MAX233, MAX235, and MAX245/MAX246/MAX247 use no external components and are recommended for applications where printed circuit board space is critical.
Saves Board Space
1. Integrated Charge Pump Circuitry
• Eliminates the Need for a Bipolar ±12V Supply
• Enables Single Supply Operation from +5V Supply
2. Integrated Capacitors (MAX223, MAX233, MAX235, MAX245–MAX247) Saves Power for Reduced Power Requirements
3. 5μW Shutdown Mode
1. Battery-Powered RS-232 Systems
2. Interface Translation
3. Low-Power Modems
4. Multidrop RS-232 Networks
6. Portable Computing
EIA/TIA-232E and V.28 specifications define a voltage level greater than 3V as a logic 0, so all receivers invert. Input thresholds are set at 0.8V and 2.4V, so receivers respond to TTL level inputs as well as EIA/TIA-232E and V.28 levels. The receiver inputs withstand an input overvoltage up to ±25V and provide input terminating resistors with nominal 5kΩvalues. The receivers implement Type 1 interpretation of the fault conditions of V.28 and EIA/TIA-232E.
Reference site : [ Wikipedia MAX232 Info ]
MAX232CPE Datasheet PDF
Other data sheets within the file : MAX220 Thru MAX249, MAX222C-D, MAX223C-D