UNISONIC TECHNOLOGIES CO., LTD

UT3238

Preliminary

CMOS IC

www.unisonic.com.tw

1 of 10

Copyright © 2017 Unisonic Technologies Co., Ltd

+3.3V TO +5.0V POWER

SUPPLY, 250KBPS, RS-232

LINE DRIVERS/RECEIVERS



DESCRIPTION

The UTC UT3238 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 UT3238 achieves 1µA supply current in shutdown

condition. When the UT3238 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 UT3238 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 UT3238 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



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

* Serial-Mouse Drivability

* Exceeds ±8KV ESD Protection(HBM) for RS-232 I/O Pins

TSSOP-28