Overview
The MAX3221IPWG4, produced by Texas Instruments, is a 3-V to 5.5-V RS-232 line driver and receiver. This device is designed to provide a reliable and efficient interface between an asynchronous communication controller and a serial-port connector. It meets or exceeds the requirements of TIA/EIA-232-F and ITU V.28 standards, ensuring compliance with industry standards for RS-232 communication.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 3.0 | 3.3 / 5.0 | 5.5 | V |
| Driver High-Level Input Voltage (VIH) | 2.0 (VCC=3.3V), 2.4 (VCC=5V) | V | ||
| Driver Low-Level Input Voltage (VIL) | 0.8 | V | ||
| Receiver Input Voltage | -25 | 25 | V | |
| Operating Free-Air Temperature | -40 (MAX3221I), 0 (MAX3221C) | 85 (MAX3221I), 70 (MAX3221C) | °C | |
| Data Signaling Rate | 250 | kbps | ||
| Driver Output Slew Rate | 30 | V/μs | ||
| Standby Current | 1 | μA |
Key Features
- RS-232 bus-pin ESD protection exceeds ±15 kV using the Human Body Model (HBM).
- Operates with a 3-V to 5.5-V VCC supply.
- Supports data signaling rates up to 250 kbps.
- Low standby current: 1 μA typical.
- External capacitors: 4 × 0.1 μF required for operation.
- Accepts 5-V logic input with a 3.3-V supply.
- Automatic power-down feature for power savings.
- INVALID output to indicate valid or invalid RS-232 signal presence.
Applications
- Industrial PCs
- Wired networking
- Data center and enterprise computing
- Battery-powered systems
- PDAs, notebooks, laptops, and palmtop PCs
- Hand-held equipment
- Digital cameras and mobile phones
Q & A
- What is the operating voltage range of the MAX3221IPWG4?
The MAX3221IPWG4 operates with a supply voltage (VCC) range of 3.0 V to 5.5 V. - What is the maximum data signaling rate supported by the MAX3221IPWG4?
The device supports data signaling rates up to 250 kbps. - What kind of ESD protection does the MAX3221IPWG4 offer?
The device offers RS-232 bus-pin ESD protection exceeding ±15 kV using the Human Body Model (HBM). - How many external capacitors are required for the MAX3221IPWG4 to operate?
Four small external capacitors (4 × 0.1 μF) are required for operation. - What is the standby current of the MAX3221IPWG4?
The standby current is typically 1 μA. - Does the MAX3221IPWG4 support automatic power-down?
Yes, the device features an automatic power-down feature for power savings. - What is the INVALID output used for in the MAX3221IPWG4?
The INVALID output indicates whether a valid or invalid RS-232 signal is present at the receiver input. - What are the package options available for the MAX3221IPWG4?
The device is available in SSOP (DB) and TSSOP (PW) packages. - What is the operating temperature range for the MAX3221IPWG4?
The operating free-air temperature range is -40°C to 85°C for the MAX3221I and 0°C to 70°C for the MAX3221C. - Can the MAX3221IPWG4 accept 5-V logic input with a 3.3-V supply?
Yes, the device can accept 5-V logic input with a 3.3-V supply.
