Operates With 3-V to 5.5-V VCC Supply

Operates 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 kV Using Human-Body Model (HBM)

Applications

− Battery-Powered Systems, PDAs,

Notebooks, Laptops, Palmtop PCs, and

Hand-Held Equipment

description/ordering information

The SN65C3222 and SN75C3222 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.

The SN65C3222 and SN75C3222 can be placed in the power-down mode by setting PWRDOWN low, which

draws only 1 μA from the power supply. When the devices are powered down, the receivers remain active while

the drivers are placed in the high-impedance state. Also, during power down, the onboard charge pump is

disabled, V+ is lowered to VCC, and V− is raised toward GND. Receiver outputs also can be placed in the

high-impedance state by setting EN high.