UT3221/E

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

7 of 10

www.unisonic.com.tw

QW-R103-128.C



DETAILED DESCRIPTION (Cont.)

circuitry and force the transmitter into its normal operating state or into its low-power standby state. When neither

control is asserted, the IC selects between these states automatically based on receiver input levels.

0V

+0.3V

+2.7V

-0.3V

-2.7V

Transmitters Enabled, INVALID High

Shutdown, Transmitters Disabled,

1µA Supply Current, INVALID Low

Transmitters Enabled, INVALID High

Indeterminate

Indeterminate

Fig.1 Shutdown Input Levels

transmitter output is disabled (high impedance). The time required to exit shutdown is typically 100µs.

Fig.2 Shutdown Input Timing