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

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

description/ordering information

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.