Overview
The MAX232DR, produced by Texas Instruments, is a dual driver/receiver integrated circuit designed to meet the requirements of the TIA/EIA-232-F and ITU recommendation V.28 standards. This device is particularly useful for converting TTL/CMOS logic levels to RS-232 voltage levels and vice versa, making it a crucial component in various communication systems. The MAX232DR operates from a single 5V power supply and includes a capacitive voltage generator to produce the necessary RS-232 voltage levels.
Key Specifications
| Parameter | Value |
|---|---|
| Power Supply Voltage | 4.5V to 5.5V |
| Supply Current | 8mA (typical) |
| Data Rate | Up to 120kbit/s |
| Number of Drivers/Receivers | Two drivers, two receivers |
| Input Levels | ±30V |
| ESD Protection | ±2kV (Human-body model) |
| Package Types | SOIC (16-pin), PDIP (16-pin), SOP (16-pin) |
| Package Size | Varies by package type (e.g., SOIC: 9.9mm × 6mm, PDIP: 19.3mm × 9mm) |
Key Features
- Meets or exceeds TIA/EIA-232-F and ITU recommendation V.28 standards
- Operates from a single 5V power supply with 1µF charge-pump capacitors
- Includes a capacitive voltage generator to supply RS-232 voltage levels
- Each receiver converts RS-232 inputs to 5V TTL/CMOS levels with a typical threshold of 1.3V and hysteresis of 0.5V
- Each driver converts TTL/CMOS input levels to RS-232 levels
- Low supply current and high ESD protection
Applications
- Battery-powered systems
- Terminals
- Modems
- Computers and other RS-232 compatible devices
Q & A
- What is the primary function of the MAX232DR? The MAX232DR is a dual driver/receiver that converts TTL/CMOS logic levels to RS-232 voltage levels and vice versa.
- What is the operating voltage range for the MAX232DR? The MAX232DR operates from a single 5V power supply, with a voltage range of 4.5V to 5.5V.
- What is the maximum data rate supported by the MAX232DR? The MAX232DR supports data rates up to 120kbit/s.
- How many drivers and receivers are included in the MAX232DR? The MAX232DR includes two drivers and two receivers.
- What level of ESD protection does the MAX232DR offer? The MAX232DR offers ±2kV ESD protection based on the Human-body model.
- What types of packages are available for the MAX232DR? The MAX232DR is available in SOIC (16-pin), PDIP (16-pin), and SOP (16-pin) packages.
- What are the typical applications of the MAX232DR? Typical applications include battery-powered systems, terminals, modems, and computers.
- How does the MAX232DR generate RS-232 voltage levels? The MAX232DR uses a capacitive voltage generator with four 1µF charge-pump capacitors to generate the necessary RS-232 voltage levels from a single 5V supply.
- What is the significance of the charge-pump capacitors in the MAX232DR? The charge-pump capacitors are crucial for generating the ±9V output levels required for RS-232 communication from a single 5V supply.
- What are the layout guidelines for using the MAX232DR? It is recommended to keep the external capacitor traces short, especially for C1 and C2 nodes, to ensure proper operation.
