MAX232D device package

MAX232D schemtic symbol

In computer systems and digital communication systems, RS-232 is a very widely used serial digital data transmission protocol. The RS-232 protocol defines the electrical parameters of the signals, timing of the signals and the connector types. Computer systems widely used RS-232 protocol for communication with modems, printers, mice and other serial peripherals. In RS-232 communication systems specialized ICs are used for providing the required signal voltage levels from a given power supply. Such ICs are known as drivers/receivers whose primary task is to convert the TTL/CMOS voltage levels into TIA/EIA-232 signal voltage levels.

Table of Contents

What is MAX232D？

The MAX232D is an EIA-232 driver/receiver developed by Texas Instruments. The device package consists of a capacitor voltage generator for providing the TIA/EIA-232 voltage levels from a single 5V supply. The built-in receivers convert the TIA/EIA-232 input signals into 5V TTL/CMOS voltage signals. The receivers have a typical threshold of 1.3V, hysteresis of 0.5V, and input voltage limits of +30V. The IC is available in SOIC, PDIP and SOP packages. The package outputs are protected against shorts to ground.

Pin Configuration

Pin number	Pin Name	Description
1,3	C1+, C1-	C1 Capacitor leads
2,6	VS+, VS-	Charge pump outputs of storage capacitor
4,5	C2+, C2-	C2 Capacitor leads
7,14	T2OUT, T1OUT	RS232 line data output
8,13	R2IN, R1IN	RS232 line data input
9,12	R2OUT, R1OUT	Logic data output
10,11	T2IN, T1IN	Logic data input
15	GND	Ground pin
16	Vcc	Supply voltage Vcc

Features

Meets or exceeds the TIA/EIA-232-F and ITU requirements
Single 5V supply operation
0 uF charge pump capacitors
Maximum data transmission rate of 120 kbit/s
Package houses two drivers and two receivers
Input voltage level limits of +30V
Low current consumption of 8mA
ESD protection exceeds JESD-22 standard

Applications

The MAX232D dual EIA-232 driver/receiver has following applications:

Signal level conversion in RS-232 communication systems
Battery powered serial communication systems
Signal conversion in data communication terminals and modems
PCs and serial computer peripherals

Specifications

The salient technical specifications of MAX232D IC package are given as following:

Voltage supply: 5V
Max data rate: 120 kbps
Input signal voltage level: +30V
Typical supply current: 8mA
ESD protection: JESD-22
Junction temperature: 150^oC
Maximum driver slew rate: 30 V/us
Receiver propagation delay; 500 ns

How MAX232D work?

The MAX232D is a dual driver and receiver built into a single package for RS-232 digital serial communication systems. The device package needs only a single 5V supply for its operation. The built-in driver converts the TTL/CMOS signals levels into EIA-232 signal levels. The built-in receiver converts the EIA-232 signal levels into TTL/CMOS signal levels. These drivers/receivers ICs are very widely used in industrial, commercial and domestic serial computer and communication systems.

The typical application circuit of MAX232D is presented in the figure below:

MAX232D application circuit

MAX232D Related Products Prices

Parts	Mfr.	Description	Stock	Prices
MAX232DWR	TI	IC DUAL EIA-232 DRVR/RCVR 16SOIC	2208	$0.738Lowest
MAX232DR	TI	IC DUAL EIA-232 DRVR/RCVR 16SOIC	199357	$0.240 Lowest
MAX232DWRG4	TI	IC DUAL EIA-232 DRVR/RCVR 16SOIC	2139	$0.526 Lowest
MAX232DW	TI	IC DUAL EIA-232 DRVR/RCVR 16SOIC	1720	$0.416 Lowest