MAX232 Serial Programming Driver IC DIP-16

MAX232 Serial Programming Driver IC DIP-16 is a dual-channel driver and receiver designed to convert TIA/EIA-232-F (RS-232) voltage levels into TTL/CMOS logic levels. This specialized integrated circuit incorporates a capacitive voltage generator to support RS-232 signal levels from a single 5 V power supply. Consequently, it eliminates the need for expensive and bulky bipolar power supplies in modern digital systems. Engineers frequently use this IC to establish reliable serial communication between microcontrollers and personal computers or legacy industrial equipment. Furthermore, the robust design of the MAX232 provides high ESD protection and signal integrity across varying cable lengths. Therefore, you should utilize this industry-standard driver to bridge the gap between low-voltage logic and high-voltage serial interfaces safely and efficiently.

Key Features:

• Single 5 V Supply: The internal charge pump circuitry generates the necessary ±10 V RS-232 levels from a standard 5 V input rail.
• Dual Drivers and Receivers: Includes two independent transmitters and two receivers, allowing for full-duplex communication and flow control signals.
• Low Power Consumption: Features an efficient design that minimizes current draw, making it suitable for battery-powered or energy-sensitive applications.
• High Data Rate: Supports data transmission speeds up to 120 kbps, which comfortably handles standard baud rates used in industrial automation.
• Integrated Capacitors: Requires only four small external 1.0 μF capacitors to operate the internal voltage doubler and inverter stages.

Technical Specifications:

• Supply Voltage (V_CC): 4.5 V to 5.5 V
• Input Logic Levels: TTL and CMOS compatible
• Output Voltage Swing: ±9 V (Typical)
• Receiver Input Resistance: 3 kΩ to 7 kΩ
• Transition Slewing Rate: 30 V/μs (Maximum)
• Operating Supply Current: 8 mA (Typical)
• ESD Protection: ±15 kV (Human Body Model)

Mechanical Specifications:

• Package Type: DIP-16 (Dual In-line Package)
• Lead Material: Tinned Copper
• Encapsulation: Plastic Molded Case
• Number of Pins: 16

Dimensions:

• Body Length: ≈ 19.05 mm
• Body Width: ≈ 6.35 mm
• Body Height: ≈ 3.30 mm
• Pin Pitch: 2.54 mm (Standard)

Pinout and Wiring:

• Pin 1, 3 (C1+, C1-): Connect a 1.0 μF charge-pump capacitor between these pins.
• Pin 4, 5 (C2+, C2-): Connect a second 1.0 μF capacitor for the negative voltage generator.
• Pin 2 (V+): Output of the voltage doubler; connect a 1.0 μF capacitor to V_CC or GND.
• Pin 6 (V-): Output of the voltage inverter; connect a 1.0 μF capacitor to GND.
• Pin 11, 14 (T1IN, T1OUT): TTL/CMOS input from the MCU and the corresponding RS-232 output to the serial port.
• Pin 13, 12 (R1IN, R1OUT): RS-232 input from the serial port and the corresponding TTL/CMOS output to the MCU.
• Pin 16 (VCC) and Pin 15 (GND): Connect to 5 V and system ground respectively.

Datasheet Reference:

• Download Texas Instruments MAX232 Datasheet

Commonly Used in:

• Microcontroller Programming: Interfacing 8051, AVR, or PIC microcontrollers with PC COM ports for firmware uploading.
• Diagnostic Equipment: Providing a serial interface for automotive scanning tools and medical diagnostic devices.
• Legacy Hardware Support: Adapting modern 5 V logic boards to communicate with older serial printers and modems.

Applications:

• RS-232 to TTL Conversion: Facilitating bidirectional data flow between high-voltage serial lines and low-voltage digital chips.
• Modem Interfacing: Connecting embedded modules to external telecommunication hardware via serial protocols.
• Industrial PLC Communication: Enabling programmable logic controllers to exchange data with HMI panels over long RS-232 cables.

Equivalent Models:

• ST232 (STMicroelectronics): A direct drop-in replacement with similar charge-pump performance.
• ICL232 (Renesas/Intersil): Provides functionally equivalent performance for serial driving and receiving.
• ADM232 (Analog Devices): High-speed equivalent that maintains pin compatibility with the standard MAX232.

Package Includes:

• 1 x MAX232 Serial Programming Driver IC DIP-16