Overview
The MAX3318EIDB, manufactured by Texas Instruments, is a dual-channel RS-232 transceiver designed for high-performance and low-power applications. This device operates at a data rate of 460 kbps and is compatible with RS-232 standards. It features advanced electrostatic discharge (ESD) protection and a proprietary low-dropout driver output stage, enabling operation from a single 2.25-V to 3-V supply. The MAX3318EIDB is particularly suited for battery-powered systems and other applications where power efficiency is crucial.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Supply Voltage (VCC) | 2.25 | 2.5 | 3 | V |
| Operating Free-Air Temperature | -40 | 85 | °C | |
| Data Rate | 460 | kbps | ||
| ESD Protection (Human-Body Model) | ±15 | kV | ||
| ESD Protection (IEC 61000-4-2, Contact Discharge) | ±8 | kV | ||
| ESD Protection (IEC 61000-4-2, Air-Gap Discharge) | ±15 | kV | ||
| Operating Supply Current | 0.3 | 2 | mA | |
| Auto-Power-Down Supply Current | 1 | 10 | μA | |
| Low-Power Standby Current | 1 | μA |
Key Features
- ESD Protection: ±15 kV (Human-Body Model), ±8 kV (IEC 61000-4-2, Contact Discharge), and ±15 kV (IEC 61000-4-2, Air-Gap Discharge).
- Low Power Consumption: 1-μA supply current in auto-power-down mode and 300-μA operating supply current.
- Auto-Power-Down Plus Option: Automatically enters a low-power mode when the RS-232 cable is disconnected or the drivers of the connected peripherals are inactive for more than 30 seconds.
- Proprietary Low-Dropout Driver Output Stage: Enables RS-232-compatible operation from a 2.25-V to 3-V supply with a dual charge pump.
- Ready to Transmit Output (READY): Asserts when the charge pump is regulating and the device is ready to begin transmitting).
- Space-Saving Packages: Available in 20-pin SSOP and 20-pin TSSOP packages).
Applications
- Battery-Powered Systems: Ideal for devices that require low power consumption to extend battery life).
- PDAs and Hand-Held Equipment: Suitable for portable devices that need reliable and efficient RS-232 communication).
- Cellular Phones and Notebooks: Used in mobile and laptop devices for serial communication).
- Pagers and Other Mobile Devices: Applicable in various mobile and handheld equipment requiring RS-232 interfaces).
Q & A
- What is the operating voltage range of the MAX3318EIDB?
The MAX3318EIDB operates from a single 2.25-V to 3-V supply).
- What is the data rate supported by the MAX3318EIDB?
The device supports a data rate of up to 460 kbps).
- What level of ESD protection does the MAX3318EIDB offer?
The device offers ±15 kV (Human-Body Model), ±8 kV (IEC 61000-4-2, Contact Discharge), and ±15 kV (IEC 61000-4-2, Air-Gap Discharge) ESD protection).
- How does the auto-power-down feature work?
The device automatically enters a low-power mode when the RS-232 cable is disconnected or the drivers of the connected peripherals are inactive for more than 30 seconds).
- What is the purpose of the READY output signal?
The READY output signal asserts when the charge pump is regulating and the device is ready to begin transmitting).
- In what packages is the MAX3318EIDB available?
The device is available in 20-pin SSOP and 20-pin TSSOP packages).
- What is the typical operating supply current of the MAX3318EIDB?
The typical operating supply current is 300 μA).
- How does the INVALID output signal work?
The INVALID output signal is high when any receiver input voltage is greater than 2.7 V or less than –2.7 V, and low if all receiver input voltages are between –0.3 V and 0.3 V for more than 30 μs).
- What are some common applications of the MAX3318EIDB?
Common applications include battery-powered systems, PDAs, hand-held equipment, cellular phones, notebooks, and pagers).
- How does the charge pump in the MAX3318EIDB work?
The charge pump requires four 0.1-μF capacitors and generates the necessary voltages for RS-232 operation from a single supply voltage).
