// Interface & Bus

MAX232

The MAX232 is an RS-232 line driver/receiver that converts TTL/CMOS logic levels to RS-232 voltage levels (+/-12V) using charge-pump capacitors. Used to interface microcontrollers with RS-232 serial ports.

// Specifications

Supply Voltage

5V (single supply)

Logic Levels

TTL/CMOS 5V

RS-232 Output

±8V minimum

Data Rate

Up to 120 kbps

Package

DIP-16 / SOIC-16

Channels

2 TX, 2 RX

// Pin Reference Table

Pin	Name	Function	Type
1	C1+	Charge pump capacitor 1 positive	I/O
2	VS+	Charge pump positive output ~+10V	PWR
3	C1-	Charge pump capacitor 1 negative	I/O
4	C2+	Charge pump capacitor 2 positive	I/O
5	C2-	Charge pump capacitor 2 negative	I/O
6	VS-	Charge pump negative output ~-10V	PWR
7	T2OUT	RS-232 TX2 output	BUS
8	R2IN	RS-232 RX2 input	BUS
9	R2OUT	TTL RX2 output to MCU	BUS
10	T2IN	TTL TX2 input from MCU	BUS
11	T1IN	TTL TX1 input from MCU	BUS
12	R1OUT	TTL RX1 output to MCU	BUS
13	R1IN	RS-232 RX1 input	BUS
14	T1OUT	RS-232 TX1 output	BUS
15	GND	Ground	GND
16	VCC	+5V supply	PWR