參數(shù)資料
型號(hào)： SP334CT-L
廠商： Exar Corporation
文件頁(yè)數(shù)： 13/13頁(yè)
文件大小： 0K
描述： IC TXRX RS232/485 PROG 28WSOIC
標(biāo)準(zhǔn)包裝： 27
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 3/5
規(guī)程： RS232，RS485
電源電壓： 5V
安裝類型： 表面貼裝
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 28-SOIC W
包裝： 管件
其它名稱： 1016-1135-5
9
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP334_00_090909
to ground and transfers the generated l0V
across C
2 to C4, the VDD storage capacitor.
Again, simultaneously with this, the positive
side of capacitor C
is switched to +5V and
the negative side is connected to ground,
and the cycle begins again.
Since both V+ and V– are separately gen-
erated 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 5kHz. The external capacitors
must be a minimum of 0.F with a 6V
breakdown rating.
External Power Supplies
For applications that do not require +5V only,
external supplies can be applied at the V+
and V– pins. The value of the external sup-
ply voltages must be no greater than ±l0V.
The current drain for the ±0V supplies is
used for RS-232. For the RS-232 driver the
current requirement will be 3.5mAper driver.
The external power supplies should provide
a power supply sequence of :+l0V, then +5V,
followed by –l0V.
VCC = +5V
–5V
+5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
VCC = +5V
–10V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
VCC = +5V
–5V
+5V
–5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
VCC = +5V
+10V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
Figure 3. Charge Pump Phase .
Figure 4. Charge Pump Phase 2.
Figure 5. Charge Pump Phase 3.
Figure 6. Charge Pump Phase 4.
+10V
GND
-10V
a) C2+
b) C2-
Figure 7. Charge Pump Waveforms
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SP334ET-L 功能描述:RS-232接口集成電路 RS232/422/RS485 Transceiver Multi 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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