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| 型号： | MAX3243CAI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS-232 W/SHTDWN 28SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 3/5 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
MAX3221/MAX3223/MAX3243
1A Supply-Current, True +3V to +5.5V
RS-232 Transceivers with AutoShutdown
8
_______________________________________________________________________________________
other system to realize that the MAX3221/MAX3223/
MAX3243 is awake. If the other system outputs valid
RS-232 signals within that time, the RS-232 ports on
both systems remain enabled.
When shut down, the device’s charge pumps are turned
off, V+ decays to VCC, V- decays to ground, and the
transmitter outputs are disabled (high impedance). The
time required to exit shutdown is typically 100s (Figure
5b).
Software-Controlled Shutdown
If direct software control is desired, INVALID can be
used to indicate DTR or Ring Indicator signal. Tie
FORCEOFF and FORCEON together to bypass Auto-
Shutdown so the line acts like a SHDN input.
___________Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation; either polarized or nonpolarized
capacitors may be used. The charge pump requires
0.1F capacitors for 3.3V operation. For other supply
voltages, refer to Table 3 for required capacitor values.
Do not use values smaller than those listed in Table 3.
Increasing the capacitor values (e.g., by a factor of 2)
reduces ripple on the transmitter outputs and slightly
reduces power consumption. C2, C3, and C4 can be
increased without changing C1’s value.
However, do
not increase C1 without also increasing the values
of C2, C3, and C4 to maintain the proper ratios (C1
to the other capacitors).
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor’s equiva-
lent series resistance (ESR) usually rises at
low temperatures and influences the amount of ripple
on V+ and V-.
Table 2. AutoShutdown Logic
RS-232 SIGNAL
PRESENT AT
RECEIVER INPUT
F
FO
OR
RC
CE
EO
OF
FF
F INPUT
FORCEON
INPUT
IIN
NV
VA
AL
LIID
D OUTPUT
TRANSCEIVER STATUS
Yes
H
X
H
Normal Operation
No
H
L
Normal Operation (Forced On)
No
H
L
Shutdown (AutoShutdown)
Yes
L
X
H
Shutdown (Forced Off)
No
L
X
L
Shutdown (Forced Off)
V-
VCC
0
V+
0
VCC
tINVL
tWU
INVALID
REGION
RECEIVER
INPUT
VOLTAGE
(V)
INVALID
OUTPUT
(V)
tINVH
TRANSMITTERS ENABLED, INVALID HIGH
RECEIVER
INPUT
LEVELS
AUTOSHUTDOWN, TRANSMITTERS DISABLED,
1A SUPPLY CURRENT, INVALID LOW
TRANSMITTERS ENABLED, INVALID HIGH
-2.7V
-0.3V
+2.7V
+0.3V
0V
INDETERMINATE
(b)
(a)
Figure 5. AutoShutdown Trip Levels
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3243CD | 制造商:Texas Instruments 功能描述: |
| MAX3243CDB | 功能描述:RS-232接口集成电路 3-5.5V MultiCh Line Driver/Receiver 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: |
| MAX3243CDB | 制造商:Texas Instruments 功能描述:RS-232 LINE DRIVER/RECEIVER 28SSOP 制造商:Texas Instruments 功能描述:RS-232 LINE DRIVER/RECEIVER, 28SSOP 制造商:Texas Instruments 功能描述:RS-232 LINE DRIVER/RECEIVER, 28SSOP; Device Type:Line Driver / Receiver; Interface Type:RS232; No. of Drivers:3; Supply Voltage Min:3V; Supply Voltage Max:5.5V; Driver Case Style:SSOP; No. of Pins:28; Operating Temperature Min:0C; ;RoHS Compliant: Yes |
| MAX3243CDBE4 | 功能描述:RS-232接口集成电路 3-5.5V MultiCh Line Driver/Receiver 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: |
| MAX3243CDBG4 | 功能描述:RS-232接口集成电路 3-5.5V Multich RS- 232 Line Drvr/Rcvr 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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