參數(shù)資料
型號(hào)： SP3227EEY-L/TR
廠商： Exar Corporation
文件頁(yè)數(shù)： 5/23頁(yè)
文件大小： 0K
描述： IC TXRX RS232 ESD SD 16TSSOP
標(biāo)準(zhǔn)包裝： 2,500
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 1/1
規(guī)程： RS232
電源電壓： 3 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 16-TSSOP
包裝： 帶卷 (TR)
3
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3224E,3225E,3226E,3227E_0_087
THEORy OF OPERATION
TheSP3224E-SP3227Edeviceshavethe
advancedAutoOn-LinePlusfeature
RS-232signalsusebothpositiveandneg-
ativevoltagesofgreaterthan±5Vmagni-
tude.Receivershavenominal5kΩimped-
ancetoground.Evenwhenidle,drivers
willmaintainoutputsignalvoltagecreating
a continuous current flow. In low power,
batteryoperateddevicesthisconstantcur-
rentdraincandecreasebatterylife
significantly.
are widely used for power-supply decou-
pling)areidealforuseonthechargepump.
Thechargepumpsaredesignedtobeable
to function properly with a wide range of
capacitorstylesandvalues.Ifpolarizedca-
pacitorsareusedthepositiveandnegative
terminals should be connected as shown
ontheTypicalOperatingCircuit.
Capacitance values may be increased if
operatingathigherVccortoprovidegreat-
erstabilityasthecapacitorsage.
Minimum Recommended Charge Pump Capacitor Values
InputVoltageVcc
ChargePumpCapacitorValueforSP32XX
3.0Vto3.6V
C-C4=0.F
4.5Vto5.5V
C=0.047F, C2-C4=0.33F
3.0Vto5.5V
C-C4=0.22F
ChargePumpCapacitorValues
C
2
+
-
V
CC
C
3
C
4
C
1
+
e-
Phases 1 and 3: Store/Double.
Double charge from C1 onto C2.
C2 is now charged to -2xVcc
+
C
2
+
-
V
CC
C
3
C
4
C
1
+
e-
+
e+
C
2
+
-
V
CC
C
3
C
4
C
1
+
Phase 2 – Vss transfer from C2 to C4.
Meanwhile C1 is charged to Vcc
e-
+
Vss
transfer from C2 to C3.
Meanwhile C1 is charged to Vcc
V
DD
V-
V+
V-
V+
Patented 5,306,954
Phase 4 VDD
ChargePumpPhases
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