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| 型号： | MAX207ECNG |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 通用总线功能 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDIP24 |
| 封装： | 0.300 INCH, PLASTIC, MS-001AF, DIP-24 |
| 文件页数： | 13/25页 |
| 文件大小： | 507K |
| 代理商： | MAX207ECNG |
______________________________________________________________________________________
13
M
±15kV ESD-Protected, +5V RS-232 Transceivers
__________Applications Information
Capacitor Selection
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
CC
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 Supplies
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 Receivers
Each transmitter is designed to drive a single receiver.
Transmitters can be paralleled to drive multiple
receivers.
Driver Outputs when Exiting Shutdown
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX207ECNG+ | 功能描述:RS-232接口集成电路 15kV ESD-Protected 5V RS232 Transceiver RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX207ECWG | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX207ECWG+ | 功能描述:RS-232接口集成电路 15kV ESD-Protected 5V RS232 Transceiver RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX207ECWG+T | 功能描述:RS-232接口集成电路 15kV ESD-Protected 5V RS232 Transceiver RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX207ECWG-T | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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