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參數(shù)資料
| 型號(hào)： | SP333CT |
| 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(yè)數(shù)： | 7/13頁(yè) |
| 文件大?。?/td> | 175K |
| 代理商： | SP333CT |
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7
TGoddard/SP333/9617R0
SP333 RS-232/AppleTalk Programmable Transceiver
Copyright 2000 Sipex Corporation
receivers features 500mV of hysteresis margin
to minimize the affects of noisy tranmission
lines. The inputs also have a 5k
resistor to
ground, in an open circuit situation the input of
the receiver will be forced low, committing the
output to a logic HIGH state. The input resis-
tance will maintain 3k
-7k
over a
±
15V range.
The maximum operating voltage range for the
receiver is
±
30V, under these conditions the
input current to the receiver must be limited to
less than 100mA. Due to the on-chip ESD pro-
tection circuitry, the receiver inputs will be
clamped to
±
15V levels; this should not affect
operation at
±
30Volts. The RS-232 receivers
can operate over 400kbps.
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. The
capacitor values of the
SP333
can be as low as
0.1
μ
F.
Figure 11a
shows the waveform found
on the positive side of capacitor C2, and
Figure
11b
shows the negative side of capacitor C2.
There is a free-running oscillator that controls
the four phases of the voltage shifting. A de-
scription of each phase follows.
signals up to
±
15V. The input resistance of the
single-ended inverting receiver is typically 5k
(3k
to 7k
). The GPI receiver can operate up
to 10Mbps.
SINGLE ENDED DRIVERS/RECEIVERS...
RS-232 (V.28) Drivers...
The single-ended drivers and receivers comply
the with the RS-232E and V.28 standards. The
drivers are inverting transmitters which accept
either TTL or CMOS inputs and output the RS-
232 signals with an inverted sense relative to the
input logic levels. Typically, the RS-232 driver
output voltage swing is
±
9V with no load and is
guaranteed to be greater than
±
5V under full
load. The drivers rely on the V+ and V- voltages
generated by the on-chip charge pump to main-
tain proper RS-232 output levels. With worst
case load conditions of 3k
and 2500pF, the
four RS-232 drivers can still maintain
±
5V
output levels. The drivers can operate over
400kbps; the propagation delay from input to
output is typically 1.5
μ
s. During shutdown, the
driver outputs will be put into a high impedance
tri-state mode.
RS-232 (V.28) Receivers...
The RS-232 receivers convert RS-232 input
signals to inverted TTL signals. Each of the four
Figure 7. Charge Pump Phase 1
Figure 8. Charge Pump Phase 2
Figure 9. Charge Pump Phase 3
Figure 10. Charge Pump Phase 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
+
+
+
+
–
–
–
–
V
CC
= +5V
–5V
+5V
–5V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+
+
–
–
–
–
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP334 | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP334CT | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP334ET | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP3481 | Cermet Potentiometer; Resistance Max:10kohm; Resistance Tolerance:+/- 10 %; Power Rating:1W; Voltage Rating:350V; Series:149; Temperature Coefficient:+/-150 ppm; Resistor Element Material:Cermet; Leaded Process Compatible:Yes |
| SP3481CN | +3.3V Low Power Half-Duplex RS-485 Transceivers with 10Mbps Data Rate |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP333ET | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Only RS-232/AppleTalk⑩ Programmable Transceiver |
| SP334 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Programmable RS-232/RS-485 Transceiver |
| SP3345ABAOPM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SP3345ACA0PMR | 制造商:Rochester Electronics LLC 功能描述:SERVO DEMOD W/ AGC + FILTER - Bulk |
| SP334CT | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Programmable RS-232/RS-485 Transceiver |
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