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Home > Interface and Driver Circuit
UT3243 Datasheet
 
+3.0V TO +5.5V POWER SUPPLY, 235KBPS, MULTICHANNAEL RS-232 LINE  DRIVERS/RECEIVERS
 
 
 
DESCRIPTION
 
The UTC UT3243 consists of 3 drivers and 5 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 +3.0V ~ +5.5V power supply. A
guaranteed data rate of 120kbps provides compatibility with popular
software for communicating with PCs.
The UTC UT3243 achieves 1µA supply current in shutdown condition. When the UT3243 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 UT3243 requires only 0.1µF capacitors in 3.3V operation, and can operate from input voltages ranging
from +3.0V ~ +5.5V. 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 UT3243 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 3.0V ~ 5.5V Power Supply
* Three Drivers and Five Receivers
* Operates Up To 235 kbps
* Designed to Transmit at a Data Rate of 235 kbps
* Low Standby Current (1uA Typical)
* External Capacitors (4*0.1µF)
* Accepts 5.0V Logic Input With 3.3V Supply
* Always-Active Non-inverting Receiver Output (R2OUTB)
* Serial-Mouse Drivability
* ESD(HBM) Protected ±8KV(MIN.)

 
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