SN65C3221E

3V 至 5.5V 单通道 RS-232 1Mbit/s 线路驱动器/接收器

* ESD Protection for RS-232 Pins

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±15-kV Human-Body Model HBM

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±8-kV IEC 61000-4-2 Contact Discharge

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±15-kV IEC 61000-4-2 Air-Gap Discharge

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Operate With 3-V to 5.5-V VCC Supply

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Operate up to 1 Mbit/s

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Low Standby Current . . . 1 µA Typ

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External Capacitors . . . 4 × 0.1 µF

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Accepts 5-V Logic Input With 3.3-V Supply

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RS-232 Bus-Pin ESD Protection Exceeds ±15 kV

Using Human-Body Model HBM

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Auto-Powerdown Feature Automatically Disables Drivers

for Power Savings

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APPLICA ONS

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Battery-Powered, Hand-Held, and Portable Equipment

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PDAs and Palmtop PCs

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Notebooks, Sub-Notebooks, and Laptops

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Digital Cameras

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Mobile Phones and Wireless Devices

## DESCRIPTION/ORDERING INFORMATION

The and SN75C3221E consist of one line driver, one line receiver, and a dual charge-pump circuit with ±15-kV IEC ESD protection pin to pin serial-port connection pins, including GND. These devices provide the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. These devices operate at data signaling rates up to 1 Mbit/s and a driver output slew rate of 24 V/µs to 150 V/µs.

Flexible control options for power management are available when the serial port is inactive. The auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the devices do not sense a valid RS-232 signal on the receiver input, the driver output is disabled. If FORCEOFF is set low and EN is high, both the driver and receiver are shut off, and the supply current is reduced to 1 µA. Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high. With auto-powerdown enabled, the device is activated automatically when a valid signal is applied to the receiver input. The INVALID output notifies the user if an RS-232 signal is present at the receiver input. INVALID is high valid data if the receiver input voltage is greater than 2.7 V or less than –2.7 V, or has been between –0.3 V and 0.3 V for less than 30 µs. INVALID is low invalid data if the receiver input voltage is between –0.3 V and 0.3 V for more than 30 µs. See for receiver input levels.