UT3243L-R28-R datasheet(7/9 Pages) UTC

Teilenummer	UT3243L-R28-R

Bauteilbeschribung	MULTICHANNAEL RS-232 LINE DRIVERS/RECEIVERS

PDF	9 Pages

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Hersteller	UTC [Unisonic Technologies]

Direct Link	http://www.utc-ic.com

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UT3243

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

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www.unisonic.com.tw

QW-R502-573.F

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DETAILED DESCRIPTION(Cont.)

Table 2 summarizes the UTC UT3243 operating modes. FORCEON and FORCEOFF override the automatic

circuitry and force the transceiver 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.

+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

Fig.1 Shutdown Input Levels

When shutdown, the UTC UT3243’s charge pumps are turned off, V+ decays to VCC, V- decays to ground, the

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

Fig.2 Shutdown Input Timing

UT3243L-R28-R Datenblatt(PDF) 7 Page - Unisonic Technologies