MAX3221EIDB

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1. Describe

The MAX3221E is a single-driver, single-receiver The RS-232 solution operates from a single VCC supply. RS-232 pins provide IEC 61000-4-2 ESD Protect. The device meets the requirements TIA/EIA-232-F and provide electrical interface Asynchronous communication between controllers and serial port connectors. charge pump and Four small external capacitors allow operation from a Single 3V to 5.5V power supply. These devices run on Data signaling rates up to 250 kbit/s and max. 30V/µs driver output slew rate. Flexible control options for power management are usable. auto power down disables the driver and +When the receiver is disconnected the charge pump or The remote driver lost power. driver can be Enable or disable manually. invalid output Low when receiver input is not connected or when power is off.

2. Feature

    1. ESD protection of RS-232 pins

        – ±15kV Human Body Model (HBM)

        – ±8 kV (IEC 61000-4-2, contact discharge)

        – ±15 kV (IEC 61000-4-2, air gap discharge)

    2. Meets or exceeds TIA/ requirements EIA-232-F and ITU v.28 standards

    3. Operates from a 3V to 5.5V VCC supply

    4. Operation up to 250 kbit/s

    5. A driver and a receiver

    6. Low standby current: 1 µA (typ)

    7. Accepts 5V logic input and 3.3V power supply

    8. Auto power off function is automatically disabled Power saving drivers

    9. Replacement for high-speed devices (1 Mbit/s)

        – SN75C3221E and SN65C3221E

3. Application

    1. Industrial PC

    2. Wired Internet

    3. Data center and enterprise computing

    4. Battery powered system

    5. Pocket PC

    6. Notebook

    7. laptop

    8. Pocket PC

    9. Handheld devices

4. Pin configuration

5. Pin Description

6. Feature Description

The power block increases, inverts, and regulates voltage at V+ and V- pins using a charge pump that requires four external capacitors. Auto-power-down feature for driver is controlled by FORCEON and FORCEOFF inputs. Receiver is controlled by EN input. When MAX3221E is unpowered, it can be safely connected to an active remote RS-232 device. One receiver interfaces RS-232 levels to standard logic levels. An open input results in a high output on ROUT. RIN input includes an internal standard RS-232 load. A logic high input on the EN pin shuts down the receiver output. The INVALID output goes low when RIN input is unpowered for more than 30 µs. The INVALID output goes high when receiver has a valid input. The INVALID output is active when Vcc is powered irregardless of FORCEON and FORCEOFF inputs.

7. Application Information

The MAX3221E line driver and receiver are dedicated devices for 3-V to 5.5-V RS-232 communications application. This application is a generic implementation of the device, with all required external components.

8. Typical Application

ROUT and DIN connect to UART or general purpose logic lines. FORCEON and FORCEOFF may be connected general purpose logic lines or tied to ground or VCC. INVALID may be connected to a general purpose logic line or left unconnected. RIN and DOUT lines connect to a RS-232 connector or cable. DIN, FORCEON, and FORCEOFF inputs must not be left unconnected.