- 您现在的位置：买卖IC网 > PDF目录1938 > MAX3218CPP+ (Maxim Integrated Products)IC TXRS RS-232 W/SHTDWN 20-DIP PDF资料下载
参数资料
| 型号： | MAX3218CPP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC TXRS RS-232 W/SHTDWN 20-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 18 |
| 类型： | 线路收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232 |
| 电源电压： | 1.8 V ~ 4.25 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 20-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 20-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 1405 (CN2011-ZH PDF) |
MAX3218
MAX3218 shuts down after sensing invalid RS-232 levels
for greater than 30 s, ensuring that the AutoShutdown
mode is not enabled for slow-moving signals (>1V/s).
Another system with AutoShutdown may need a period
of time to wake up. Figure 5 shows a circuit that forces
the transmitters on for 100ms after start-up, allowing
enough time for the other system to realize that the
MAX3218 system is awake. If the other system outputs
valid RS-232 signals within that time, the RS-232 ports on
both systems remain enabled.
__________Applications Information
Operation from Regulated/Unregulated
Dual System Power Supplies
The MAX3218 is intended for use with three different
power-supply sources: it can be powered directly from
a battery, from a 3.0V or 3.3V power supply, or simulta-
neously from both. Figure 1 shows the single-supply
configuration. Figure 6 shows the circuit for operation
from both a 3V supply and a raw battery supply—an
ideal configuration where a regulated 3V supply is
being derived from two cells. In this application, the
MAX3218’s logic levels remain appropriate for interface
with 3V logic, yet most of the power for the MAX3218 is
drawn directly from the battery, without suffering the
efficiency losses of the DC-DC converter. This pro -
longs battery life.
Bypass the input supplies with 0.1F at VCC (C4) and at
least 1F at the inductor (C5). Increase C5 to 4.7F if
the power supply has no other bypass capacitor con-
nected to it.
Low-Power Operation
The following suggestions will help you get maximum
life out of your batteries.
Transmit at the highest practical data rate. Although
this raises the supply current while transmission is in
progress, the transmission will be over sooner. If the
MAX3218 is shut down (using FORCEOFF ) as soon as
each transmission ends, this practice will save energy.
Operate your whole system from the raw battery volt-
age rather than suffer the losses of a regulator or DC-
DC converter. If this is not possible, but your system is
powered from two cells and employs a 3V DC-DC con-
verter to generate the main logic supply, use the circuit
of Figure 6. This circuit draws most of the MAX3218’s
power straight from the battery, but still provides logic-
level compatibility with the 3V logic.
1A Supply Current, 1.8V to 4.25V-Powered
RS-232 Transceiver with AutoShutdown
8
_______________________________________________________________________________________
INVALID IS AN INTERNALLY GENERATED SIGNAL
THAT IS USED BY THE AUTOSHUTDOWN LOGIC
AND APPEARS AS AN OUTPUT OF THE DEVICE.
POWER DOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
FORCEOFF
0
1
FORCEON
0
1
0
1
INVALID
0
1
0
1
0
1
0
1
POWER DOWN
0
1
POWER DOWN
FORCEOFF
FORCEON
INVALID
+
-
+
-
Rx
R_IN
FORCEON
FORCEOFF
R_OUT
30s
DELAY
+0.3V to +2.8V
-0.3V to -2.8V
Figure 3. AutoShutdown Logic
相关PDF资料 |
PDF描述 |
|---|---|
| MAX3221ECDB | IC RS232 3V-5.5V DRVR 16-SSOP |
| MAX3223EAP | IC TXRX RS232 120KBPS SD 20-SSOP |
| MAX3225EEUP | IC TXRX RS232 1MBPS SD 20-TSSOP |
| MAX3227IDB | IC RS232 3V5.5V 15KVESD 16-SSOP |
| MAX3232ECAE | IC TXRX RS232 1MBPS LP 16-SSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3218CPP+ | 功能描述:RS-232接口集成电路 1uA 1.8-4.25V Tcvr w/AutoShutdown 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: |
| MAX3218CWP | 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: |
| MAX3218CWP+ | 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: |
| MAX3218CWP+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: |
| MAX3218CWP-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: |
发布紧急采购，3分钟左右您将得到回复。