The SN65C3221EPWR 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 INVALID is low (invalid data) if the receiver input voltage is between –0.3 V and 0.3 V for more than 30 μs. Seefor receiver input levels.
Feature
- ESD Protection for RS-232 Pins
- ±15-kV Human-Body Model (HBM)
- ±8-kV IEC 61000-4-2 Contact Discharge
- ±15-kV IEC 61000-4-2 Air-Gap Discharge
- Operate With 3-V to 5.5-V VCC Supply
- Operate up to 1 Mbit/s
- Low Standby Current . . . 1 μA Typ
- External Capacitors . . . 4 × 0.1 μF
- Accepts 5-V Logic Input With 3.3-V Supply
- RS-232 Bus-Pin ESD Protection Exceeds ±15 kVUsing Human-Body Model (HBM)
- Auto-Powerdown Feature Automatically Disables Drivers for Power Savings
- APPLICATIONS
- Battery-Powered, Hand-Held, and Portable Equipment
- PDAs and Palmtop PCs
- Notebooks, Sub-Notebooks, and Laptops
- Digital Cameras
- Mobile Phones and Wireless Devices
