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參數(shù)資料
| 型號： | SP202ECN |
| 元件分類： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁數(shù)： | 6/15頁 |
| 文件大?。?/td> | 126K |
| 代理商： | SP202ECN |
Rev. 06/20/02
SP202E Series High Performance RS232 Transceivers
Copyright 2002 Sipex Corporation
6
V
CC
= +5V
–5V
–5V
+5V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+
+
–
–
–
–
Figure 4. Charge Pump — Phase 1
Figure 5. Charge Pump — Phase 2
V
CC
= +5V
–10V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+
+
–
–
–
–
In actual system applications, it is quite possible
for signals to be applied to the receiver inputs
before power is applied to the receiver circuitry.
This occurs, for example, when a PC user attempts
to print, only to realize the printer wasn’t turned on.
In this case an RS-232 signal from the PC will
appear on the receiver input at the printer. When
the printer power is turned on, the receiver will
operate normally. All of these enhanced devices
are fully protected.
Charge Pump
The charge pump is a
Sipex
–patented design
(5,306,954) and uses a unique approach com-
pared to older less–efficient designs. The charge
pump still requires four external capacitors, but
uses a four–phase voltage shifting technique to
attain symmetrical 10V power supplies. There
is a free–running oscillator that controls the four
phases of the voltage shifting. A description of
each phase follows.
Phase 1
— V
charge storage —During this phase of
the clock cycle, the positive side of capacitors
C
and C
are initially charged to +5V. C
l
then switched to ground and the charge in C
transferred to C
+5V, the voltage potential across capacitor C
2
is
now 10V.
+
is
–
is
–
. Since C
+
is connected to
Phase 2
— V
transfer — Phase two of the clock con-
nects the negative terminal of C
to the V
SS
storage capacitor and the positive terminal of C
2
to ground, and transfers the generated –l0V to
C
. Simultaneously, the positive side of capaci-
tor C
is switched to +5V and the negative side
is connected to ground.
Phase 3
— V
charge storage — The third phase of the
clock is identical to the first phase — the charge
transferred in C
produces –5V in the negative
terminal of C
, which is applied to the negative
side of capacitor C
. Since C
voltage potential across C
2
is l0V.
+
is at +5V, the
Phase 4
— V
transfer — The fourth phase of the clock
connects the negative terminal of C
to ground,
and transfers the generated l0V across C
to C
4
,
the V
storage capacitor. Again, simultaneously
with this, the positive side of capacitor C
is
switched to +5V and the negative side is con-
nected to ground, and the cycle begins again.
Since both V
+
and V
–
are separately generated
from V
CC
; in a no–load condition V
+
and V
–
will
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP202ECN/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High-Performance RS-232 Line Drivers/Receivers |
| SP202ECN-L | 功能描述:RS-232接口集成電路 RS232 2Tx/2Rx temp 0C to 70C 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP202ECN-L/TR | 功能描述:RS-232接口集成電路 HIGH PERFORMANCE RS232 0-70C 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP202ECP | 制造商:Exar Corporation 功能描述:Line Transceiver, 2-Driver, 2-Receiver, 16 Pin, Plastic, DIP |
| SP202ECP-L | 功能描述:RS-232接口集成電路 RS232 2Tx/2Rx temp 0C to 70C 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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