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UT3223_17 Datasheet(PDF) 7 Page - Unisonic Technologies

Part No. UT3223_17
Description  DRIVERS/RECEIVERS
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
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UT3223
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
7 of 9
www.unisonic.com.tw
QW-R502-A91.e
DETAILED DESCRIPTION(Cont.)
Table 2 summarizes the UTC UT3223 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.
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
When shutdown, the UTC UT3223’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




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