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參數(shù)資料
| 型號： | SP331CT |
| 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)： | 9/13頁 |
| 文件大?。?/td> | 169K |
| 代理商： | SP331CT |
SP331DS/13
SP331 RS-232/RS-485 Serial Transceiver
9
Copyright 2000 Sipex Corporation
Figure 11. Charge Pump Phase 1.
Figure 12. Charge Pump Phase 2.
Figure 13. Charge Pump Phase 3.
Figure 14. Charge Pump Phase 4.
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 generated
from V
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 15kHz. The external capacitors must
be 0.1
μ
F with a 16V 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 supply volt-
ages must be no greater than
±
l0V. The current
drain for the
±
10V supplies is used for RS-232.
For the RS-232 driver the current requirement
will be 3.5mA per driver. The external power
supplies should provide a power supply se-
quence of :+l0V, then +5V, followed by –l0V.
V
CC
= +5V
–5V
–5V
+5V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+
+
–
–
–
–
V
CC
= +5V
–10V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+
+
–
–
–
–
V
CC
= +5V
–5V
+5V
–5V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+
+
–
–
–
–
V
CC
= +5V
+10V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+
+
–
–
–
–
Figure 15. Charge Pump Waveforms
+10V
a) C
2
+
GND
GND
-10V
b) C
2
-
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP331ET | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP332 | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP332CT | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP332ET | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP333 | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP331CT/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Programmable Dual RS-232/RS-485 Transceiver |
| SP331CT-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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP331CT-L/TR | 功能描述:RS-232接口集成電路 Programmable RS-232/RS-485 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: |
| SP331ET | 制造商:Exar Corporation 功能描述: |
| SP331ET/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Programmable Dual RS-232/RS-485 Transceiver |
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