SS
參數(shù)資料
型號(hào)： SP3239ECA-L
廠商： Exar Corporation
文件頁(yè)數(shù)： 16/16頁(yè)
文件大?。?/td> 0K
描述： IC TXRX RS232 INTELLIGENT 28SSOP
標(biāo)準(zhǔn)包裝： 46
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 5/3
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： 28-SSOP（0.209"，5.30mm 寬）
供應(yīng)商設(shè)備封裝： 28-SSOP
包裝： 管件
其它名稱： 1016-1116-5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP3239E_100_020111
9
Phase 1
— V
SS charge storage — During this phase of the
clock cycle, the positive side of capacitors C
1 and
C
2 are initially charged to VCC. Cl
+
is then switched
to GND and the charge in C
1
–
is transferred to C
2
–
.
SinceC
2
+
isconnectedtoV
CC, the voltage potential
across capacitor C
2 is now 2 times VCC.
Phase 2
— V
SS transfer — Phase two of the clock
connects the negative terminal of C
2 to the VSS
storage capacitor and the positive terminal of
C
2 to GND.
This transfers a negative gener-
ated voltage to C
3. This generated voltage is
regulated to a minimum voltage of -5.5V.
SimultaneouswiththetransferofthevoltagetoC
3,
the positive side of capacitor C
1 is switched to VCC
and the negative side is connected to GND.
Phase 3
— V
DD charge storage — The third phase of the
clock is identical to the first phase — the charge
transferred in C
1 produces –VCC in the negative
terminal of C
1, which is applied to the negative
side of capacitor C
2. Since C2
+
is at V
CC, the volt-
age potential across C
2 is 2 times VCC.
Phase 4
— V
DD transfer — The fourth phase of the clock
connects the negative terminal of C
2 to GND,
and transfers this positive generated voltage
across C
2 to C4, the VDD storage capacitor. This
voltage is regulated to +5.5V. At this voltage,
the internal oscillator is disabled. Simultane-
ous with the transfer of the voltage to C
4, the
positive side of capacitor C
1 is switched to VCC
and the negative side is connected to GND, al-
lowing the charge pump cycle to begin again.
The charge pump cycle will continue as long
as the operational conditions for the internal
oscillator are present.
Since both V+ and V– are separately generated
from V
CC, in a no–load condition V
+
and V– will
be symmetrical. Older charge pump approaches
that generate V– from V+ will show a decrease in
the magnitude of V– compared to V+ due to the
inherent inefficiencies in the design.
The clock rate for the charge pump typically
operates at 500kHz. The external capacitors
can be as low as 0.1F with a 16V breakdown
voltage rating.
Figure 10. Charge Pump Waveform
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP3239ECA-L/TR 功能描述:RS-232接口集成電路 Intel. +3V to +5.5V RS-232 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:
SP3239ECY-L 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:
SP3239ECY-L/TR 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:
SP3239EEA-L 功能描述:RS-232接口集成電路 Intel. +3V to +5.5V RS-232 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:
SP3239EEA-L/TR 功能描述:RS-232接口集成電路 Intel. +3V to +5.5V RS-232 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:
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