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参数资料
| 型号： | SP3227EEY-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 5/23页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 ESD SD 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (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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