Max232 TTL Converter IC

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The MAX232 is an integrated circuit (IC), that converts signals from a TIA-232 (RS-232) serial port to signals suitable for use in TTL-compatible digital logic circuits. The MAX232 is a dual transmitter / dual receiver that typically is used to convert the RX, TX, CTS, RTS signals.

Description

Max232 TTL Converter IC

The MAX232 is an integrated circuit (IC), that converts signals from a TIA-232 (RS-232) serial port to signals suitable for use in TTL-compatible digital logic circuits. The MAX232 is a dual transmitter / dual receiver that typically is used to convert the RX, TX, CTS, RTS signals.

The drivers provide TIA-232 voltage level outputs (about ±7.5 volts) from a single 5-volt supply by on-chip charge pumps and external capacitors. This makes it useful for implementing TIA-232 in devices that otherwise do not need any other voltages.

The receivers reduce TIA-232 inputs, which may be as high as ±25 volts, to standard 5-volt TTL levels. These receivers have a typical threshold of 1.3 volts and a typical hysteresis of 0.5 volts.

The MAX232 replaced an older pair of chips MC1488 and MC1489 that performed a similar RS-232 translation. The MC1488 quad transmitter chip required 12 volts and – 12-volt power, and MC1489 quad receiver chip required 5-volt power. The main disadvantages of this older solution were the +/- 12-volt power requirement, only supported 5-volt digital logic, and two chips instead of one.

Max232 TTL Converter IC Features

  • TTL/CMOS to RS232 Converter IC
  • Can support two conversions at the same time (Dual drivers and Receivers)
  • Easy to set-up and initialize
  • Operating speed: 120kbit/s
  • ±30-V Input Levels
  • Operating current: 8mA
  • Available in 16-pin PDIP, SO, SOIC packages

MAX232 Pin Configuration and Description

Pin NumberPin NameDescription
1C1 +Connects to the positive end of the First capacitor
2V+Connects to one end of the capacitor & another end is grounded
3C1 –Connects to the negative end of First Capacitor
4C2+Connects to positive end of the second capacitor
5C2-Connects to negative end of the second capacitor
6V-Connects to one end of the capacitor & other end is grounded
7T2 OUTTransmission pin of second converter module for RS232 cable
8R2 INReception pin of second converter module for RS232 cable
9R2 OUTReception pin of second converter module for Microcontroller(Rx)
10T2 INTransmission pin of second converter module for Microcontroller(Tx)
11T1 INTransmission pin of first converter module for Microcontroller(Tx)
12R1 OUTReception pin of first converter module for Microcontroller(Rx)
13R1 INReception pin of first converter module for RS232 cable
14T1 OUTTransmission pin of first converter module for RS232 cable
15GroundConnects to the ground of the circuit
16VccConnects to the supply voltage typically +5V

 

Click here to get the datasheet

 

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