UT3238G-P28-R datasheet(8/10 Pages) UTC

部件名	UT3238G-P28-R

功能描述	LINE DRIVERS/RECEIVERS

PDF	10 Pages

Scroll/Zoom	100%

制造商	UTC [Unisonic Technologies]

网页	http://www.utc-ic.com

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8 / 10 page

UT3238

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

8 of 10

www.unisonic.com.tw

QW-R502-B54..a



DETAILED DESCRIPTION(Cont.)

Figure 1 depicts valid and invalid RS-232 receiver voltage levels. INVALID indicates the receiver input’s condition,

and is independent of FORCEON and FORCEOFF states.

+0.3V

+2.7V

-0.3V

-2.7V

INVALID High

INVALID Low

INVALID High

Indeterminate

Fig.1 Shutdown Input Levels

When shutdown, the UTC UT3238’s charge pumps are turned off, V+ decays to VCC, V- decays to ground, the

transmitter output is disabled (high impedance). The time required to exit shutdown is typically 25µs.

RECEIVER

INPUTS

TRANSMITTER

INPUTS

TRANSMITTER

OUTPUTS

INVALID

OUTPUT

VCC

*VCC

V+

VCC

V-

OUTPUT

tINVL

tINVH

tAUTOSHDN

tWU

tAUTOSHDN

tWU

INVALID

REGION

Fig.2 Shutdown Input Timing

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