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| 型號(hào)： | MAX203E |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | ±5kV ESD-Protected, +5V RS-232 Transceivers(5V,120kbps,自關(guān)閉方式, ESD保護(hù),RS-232收發(fā)器) |
| 中文描述： | ±15kV ESD保護(hù)、+5V RS-232收發(fā)器 |
| 文件頁(yè)數(shù)： | 13/24頁(yè) |
| 文件大?。?/td> | 265K |
| 代理商： | MAX203E |
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M
±15kV ESD-Protected, +5V RS-232 Transceivers
______________________________________________________________________________________
13
__________Applic ations Information
Capac itor S elec tion
The capacitor type used for C1–C4 is not critical for
proper operation. The MAX202E, MAX206–MAX208E,
MAX211E, and MAX213E require 0.1μF capacitors,
and the MAX232E and MAX241E require 1μF
capacitors, although in all cases capacitors up to 10μF
can be used without harm. Ceramic, aluminum-
electrolytic, or tantalum capacitors are suggested for
the 1μF capacitors, and ceramic dielectrics are
suggested for the 0.1μF capacitors. When using the
minimum recommended capacitor values, make sure
the capacitance value does not degrade excessively
as the operating temperature varies. If in doubt, use
capacitors with a larger (e.g., 2x) nominal value. The
capacitors’ effective series resistance (ESR), which
usually rises at low temperatures, influences the
amount of ripple on V+ and V-.
Use larger capacitors (up to 10μF) to reduce the output
impedance at V+ and V-. This can be useful when
“stealing” power from V+ or from V-. The MAX203E and
MAX205E have internal charge-pump capacitors.
Bypass V
C C
to ground with at least 0.1μF. In
applications sensitive to power-supply noise generated
by the charge pumps, decouple V
CC
to ground with a
capacitor the same size as (or larger than) the charge-
pump capacitors (C1–C4).
V + and V - as Power S upplies
A small amount of power can be drawn from V+ and V-,
although this will reduce both driver output swing and
noise margins. Increasing the value of the charge-pump
capacitors (up to 10μF) helps maintain performance
when power is drawn from V+ or V-.
Driving Multiple Rec eivers
Each transmitter is designed to drive a single receiver.
Transmitters can be paralleled to drive multiple
receivers.
Driver Outputs when Exiting S hutdown
The driver outputs display no ringing or undesirable
transients as they come out of shutdown.
High Data Rates
These transceivers maintain the RS-232 ±5.0V
minimum driver output voltages at data rates of over
120kbps. For data rates above 120kbps, refer to the
Transmitter Output Voltage vs. Load Capacitance
graphs in the Typical Operating Characteristics.
Communication at these high rates is easier if the
capacitive loads on the transmitters are small; i.e.,
short cables are best.
Table 2. Summary of EIA/TIA-232E, V.28 Specifications
PARAMETER
CONDITIONS
EIA/TIA-232E, V.28
SPECIFICATIONS
0 Level
3k
to 7k
load
+5V to +15V
Data Rate
3k
≤
R
L
≤
7k
, C
L
≤
2500pF
Up to 20kbps
+3V to +15V
Instantaneous Slew Rate, Max
3k
≤
R
L
≤
7k
, C
L
≤
2500pF
30V/μs
Driver Output Short-Circuit Current, Max
100mA
Transition Rate on Driver Output
V.28
1ms or 3% of the period
Driver Output Resistance
-2V < V
OUT
< +2V
300
EIA/TIA-232E
4% of the period
Driver Output Level, Max
No load
±25V
Driver Output Voltage
3k
to 7k
load
-5V to -15V
0 Level
1 Level
1 Level
Receiver Input Level
±25V
Receiver Input Voltage
-3V to -15V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX203ECPP | 功能描述:RS-232接口集成電路 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: |
| MAX203ECPP+ | 制造商:Maxim Integrated Products 功能描述:Dual Transmitter/Receiver RS-232 20-Pin PDIP N Bulk |
| MAX203ECPP+G36 | 功能描述:RS-232接口集成電路 15kV ESD-Protected 5V RS232 Transceiver 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: |
| MAX203ECWP | 功能描述:RS-232接口集成電路 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: |
| MAX203ECWP+ | 制造商:Maxim Integrated Products 功能描述:Dual Transmitter/Receiver RS-232 20-Pin SOIC W Bulk 制造商:Maxim Integrated Products 功能描述:TRANSCEIVER DUAL RS232 SMD SOIC20 制造商:Maxim Integrated Products 功能描述:TRANSCEIVER DUAL RS232, SMD, SOIC20 |
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