| Drivers per package | 2 |
| Receivers per package | 2 |
| Logic voltage (Min) (V) | 3.3 |
| Data rate (Max) (kbps) | 1000 |
| Main supply voltage (Nom) (V) | 3.3, 5 |
| Features | Auto-Powerdown |
| ESD HBM (kV) | 15 |
| Rating | Catalog |
| Operating temperature range (C) | 0 to 70 |
| Vout (Typ) (V) | 5.4 |
- Operate With 3-V to 5.5-V VCC Supply
- Operate Up to 1 Mbit/s
- Low Standby Current ...1 μA Typical
- External Capacitors ...4 × 0.1 μF
- Accept 5-V Logic Input With 3.3-V Supply
- Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
- RS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM)
- Applications
- Battery-Powered Systems, PDAs, Notebooks, Laptops, Palmtop PCs, and Hand-Held Equipment
The SN65C3223 and SN75C3223 consist of two line drivers, two line receivers, and a dual charge-pump circuit with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). The 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. The 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 device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF\ is set low and EN is high, both drivers and receivers are shut off, and the supply current is reduced to 1 μA. Disconnecting the serial port or turning off the peripheral drivers causes auto-powerdown 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 any receiver input. The INVALID\ output is used to notify the user if an RS-232 signal is present at any receiver input. INVALID\ is high (valid data) if any 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. Refer to Figure 4 for receiver input levels.
