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参数资料
| 型号： | MAX3243EAI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/16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
_______________________________________________________________________________________
5
______________________________________________________________Pin Description
Noninverting Receiver Output—active in shutdown
R2OUTB
Output of the valid signal detector. Indicates if a valid RS-232 level is pres-
ent on receiver inputs logic “1”.
INVALID
Drive low to shut down transmitters and on-board power supply. This over-
rides all automatic circuitry and FORCEON (Table 1).
FORCEOFF
Drive high to override automatic circuitry keeping transmitters on
(FORCEOFF must be high) (Table 1).
FORCEON
Negative terminal of the voltage doubler charge-pump capacitor
C1-
RS-232 Receiver Inputs
R_IN
RS-232 Transmitter Outputs
T_OUT
TTL/CMOS Transmitter Inputs
T_IN
TTL/CMOS Receiver Outputs
R_OUT
-5.5V generated by the charge pump
V-
Negative terminal of inverting charge-pump capacitor
C2-
Positive terminal of inverting charge-pump capacitor
C2+
Receiver Enable Control. Drive low for normal operation. Drive high to force
the receiver outputs into a high-Z state.
EN
FUNCTION
Ground
GND
+3.0V to +5.5V Supply Voltage
VCC
LapLink is a trademark of Traveling Software.
_______________Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3221/MAX3223/MAX3243’s internal power
supply consists of a regulated dual charge pump that
provides output voltages of +5.5V (doubling charge
pump) and -5.5V (inverting charge pump), regardless
of the input voltage (VCC) over the +3.0V to +5.5V
range. The charge pumps operate in a discontinuous
mode: if the output voltages are less than 5.5V, the
charge pumps are enabled; if the output voltages
exceed 5.5V, the charge pumps are disabled. Each
charge pump requires a flying capacitor (C1, C2) and
a reservoir capacitor (C3, C4) to generate the V+ and
V- supplies.
RS-232 Transmitters
The transmitters are inverting level translators that con-
vert CMOS-logic levels to 5.0V EIA/TIA-232 levels. They
guarantee a 120kbps data rate with worst-case loads of
3k in parallel with 1000pF, providing compatibility with
PC-to-PC communication software (such as Laplink).
Typically, the MAX3221/MAX3223/MAX3243 can oper-
ate at data rates of 235kbps. Transmitters can be paral-
leled to drive multiple receivers or mice (MAX3243).
Figure 1 shows a complete system connection.
When FORCEOFF is driven to ground, or the Auto-
Shutdown circuitry senses invalid voltage levels at all
receiver inputs, the transmitters are disabled and the
outputs are forced into a high-impedance state.
—
10
16
12
4
8
13
11
9
7
6
5
1
14
15
NAME
MAX3221
+5.5V generated by the charge pump
V+
3
Positive terminal of the voltage doubler charge-pump capacitor
C1+
2
—
11
20
14
4
9, 16
8, 17
12, 13
10, 15
7
6
5
1
18
19
20
21
22
23
24
4–8
9, 10, 11
12, 13, 14
15–19
3
2
1
—
25
26
MAX3223
3
MAX3243
27
2
28
PIN
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3243ECAI | 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: |
| MAX3243ECAI+ | 功能描述:RS-232接口集成电路 3-5.5V 250kbps 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: |
| MAX3243ECAI+T | 功能描述:RS-232接口集成电路 3-5.5V 250kbps 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: |
| MAX3243ECAIT | 制造商:MAX 功能描述:* |
| MAX3243ECAI-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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