DESCRIPTION

The UTC UTRS3238 consists of 5 drivers and 3 receivers. It meets
ElA/TIA-232 and V.28/V.24 specifications, it intended for notebook
computer applications. A high-efficiency, dual charge-pumps power
supply and a low-dropout transmitter combine to deliver true
RS-232 performance from a single +3.3V ~ +5.0V power supply. A
guaranteed data rate of 250kbps provides compatibility with
popular software for communicating with PCs.
The UTC UTRS3238 achieves 1µA supply current in shutdown
condition. When the UTRS3238 doesn’t detect a valid signal level on
its receiver inputs, the on-board power supply and drivers will
shutdown, and when a valid level is applied to any RS-232 receiver
input, then the system turns on again. Therefore, the system saves
power without changes to the existing BIOS or operating system.
The UTC UTRS3238 requires only 0.1µF capacitors in 3.3V
operation, and can operate from input voltages ranging from +3.3V
~ +5.0V. It is ideal for 3.3V-only systems, 5.0V-only systems, or
mixed 3.3V and 5.0V systems that require true RS-232
performance.
The UTC UTRS3238 includes one complementary always-active
receiver that can monitor an external device (such as a modem) in
shutdown, without forward biasing the protection diodes in a UART
that may have VCC completely removed.

FEATURES

* Operates With 3.3V~5.0V Power Supply
* Five Drivers and Three Receivers
* Operates Up To 250 kbps
* Designed to Transmit at a Data Rate of 250 kbps
* Low Standby Current (1µA Typical)
* External Capacitors (4*0.1µF)
* Accepts 5.0V Logic Input With 3.3V Supply
*Always-Active Non-inverting Receiver Output (R1OUTB)
* Serial-Mouse Drivability
* Exceeds ±8KV ESD Protection(HBM) for RS-232 I/O Pins