參數(shù)資料
型號(hào): SP3225ECA-L
廠商: Exar Corporation
文件頁數(shù): 5/23頁
文件大?。?/td> 0K
描述: IC TXRX RS232 ESD SD 20SSOP
標(biāo)準(zhǔn)包裝: 66
類型: 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù): 2/2
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: 20-SSOP(0.209",5.30mm 寬)
供應(yīng)商設(shè)備封裝: 20-SSOP
包裝: 管件
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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SP3225ECY-L 功能描述:RS-232接口集成電路 1MBPS+3-+5.5V RS-232 AUTO ONLINE PLUS RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
SP3225ECY-L/TR 功能描述:RS-232接口集成電路 1MBPS+3-+5.5V RS-232 AUTO ONLINE PLUS RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
SP3225EEA-L 功能描述:RS-232接口集成電路 1MBPS+3-+5.5V RS-232 AUTO ONLINE PLUS RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
SP3225EEA-L/TR 功能描述:RS-232接口集成電路 1MBPS+3-+5.5V RS-232 AUTO ONLINE PLUS RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: