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參數(shù)資料
| 型號(hào)： | SP211EHCA |
| 英文描述： | High Speed 5V High Performance RS232 Transceivers |
| 中文描述： | 高速5V的高性能RS232收發(fā)器 |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大?。?/td> | 204K |
| 代理商： | SP211EHCA |
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SP207EHDS/08
SP207EH Series High Performance RS232 Transceivers
6
Copyright 2000 Sipex Corporation
Figure 2. Charge Pump — Phase 2
Figure 3. Charge Pump Waveforms
+10V
a) C
2
+
GND
GND
b) C
2
–
–10V
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
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 can
be as low as 0.1
μ
F with a 16V breakdown
voltage rating.
Transmitter/Driver
The drivers of the
SP207EH Series
can maintain
a typical data rate of 500Kbps. This superior
RS-232 data transmission rate makes the
SP207EH Series
an ideal match for many
designs in personal computer peripherals and
LAN applications that demand high speed
performance.
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
output voltage swing is +9V with no load, and +5V
minimum with full load. The transmitter outputs
are protected against infinite short–circuits to
ground without degradation in reliability. The
drivers of the
SP211EH
,
and
SP213EH
can be
tri–stated by using the SHUTDOWN function.
In the “power-off” state, the output impedance will
remain greater than 300 ohms, again satisfying the
RS-232 specifications. Should the input of the
driver be left open, an internal 400Kohm pullup
resistor to V
forces the input high, thus commit-
ting the output to a low state. The slew rate of the
transmitter output is internally limited to a maxi-
mum of 30V/
μ
s in order to meet the EIA standards
(EIA RS-232D 2.1.7, Paragraph 5). The transition
of the loaded output from high to low also meets
the monotonicity requirements of the standard.
V
CC
= +5V
–10V
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 |
|---|---|
| SP211EHCT | High Speed 5V High Performance RS232 Transceivers |
| SP211EHEA | High Speed 5V High Performance RS232 Transceivers |
| SP207EHCA | High Speed 5V High Performance RS232 Transceivers |
| SP207EHCP | High Speed 5V High Performance RS232 Transceivers |
| SP207EHCT | High Speed 5V High Performance RS232 Transceivers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP211EHCA-L | 功能描述:RS-232接口集成電路 460KBPS 5V 4DRV/5RCV RS-232 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP211EHCA-L/TR | 功能描述:RS-232接口集成電路 460KBPS 5V 4DRV/5RCV RS-232 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP211EHCT | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed +5V High Performance RS232 Transceivers |
| SP211EHCT-L | 功能描述:RS-232接口集成電路 460KBPS 5V 4DRV/5RCV RS-232 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP211EHCT-L/TR | 功能描述:RS-232接口集成電路 460KBPS 5V 4DRV/5RCV RS-232 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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