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MAX3238CAI-T

更新时间： 2024-09-13 12:27:51
品牌 Logo 应用领域
美信 - MAXIM /
页数 文件大小 规格书
12页 207K
描述
3.0V to 5.5V, 1μA, up to 250kbps, True RS-232 Transceiver with AutoShutdown Plus

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MAX3238CAI-T 数据手册

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19-1144; Rev 1; 10/02  
+3.0V to +5.5V, 1µA, up to 250kbps, True  
RS-232 Transceiver with AutoShutdown Plus  
_______________General Description  
____________________________Features  
The MAX3238 true RS-232 transceiver achieves a  
1µA supply current with Maxim’s revolutionary  
AutoShutdown Plus™ feature. When the device does  
not sense a valid signal transition on either the receiver  
or transmitter inputs within 30sec, the on-board power  
supply and drivers shut down. This occurs if the RS-232  
cable is disconnected or if the transmitters of the con-  
nected peripheral are inactive. The system turns on  
again when a valid transition is applied to any RS-232  
receiver or transmitter input, saving power without  
changes to the existing BIOS or operating system.  
ꢀ 1µA Supply Current Achieved with  
AutoShutdown Plus  
ꢀ Guaranteed Data Rate: 250kbps  
ꢀ 1µA Low-Power Shutdown  
ꢀ Receivers Active in AutoShutdown Plus Mode  
ꢀ Flow-Through Pinout  
ꢀ Meets EIA/TIA-232 Specifications Down to 3.0V  
ꢀ Guaranteed 6V/µs Slew Rate  
The MAX3238 5-driver/3-receiver complete serial port is  
a 3V-powered EIA/TIA-232 and V.28/V.24 communica-  
tions interface intended for notebook or subnotebook  
computer applications. A proprietary, high-efficiency,  
dual charge-pump power supply and a low-dropout  
transmitter combine to deliver true RS-232 performance  
from a single +3.0V to +5.5V supply. A guaranteed  
data rate of 250kbps provides compatibility with popu-  
lar software for communicating with personal comput-  
ers. The MAX3238 requires only 0.1µF capacitors in  
3.3V operation. It is ideal for 3.3V-only systems, mixed  
3.3V and 5.0V systems, or 5V-only systems that require  
true RS-232 performance.  
______________Ordering Information  
PART  
TEMP RANGE  
0°C to +70°C  
-40°C to +85°C  
PIN-PACKAGE  
28 SSOP  
MAX3238CAI  
MAX3238EAI  
28 SSOP  
Receiver R1 has an extra, always-active output (in addi-  
tion to its standard output), which allows external  
devices, such as a modem, to be monitored without for-  
ward biasing the protection diodes in circuitry that may  
__________________Pin Configuration  
have V  
completely removed.  
CC  
TOP VIEW  
The MAX3238 is available in a space-saving SSOP  
package.  
C2+  
GND  
C2-  
V-  
28  
27  
26  
25  
24  
23  
22  
1
2
C1+  
V+  
________________________Applications  
V
3
CC  
Notebook, Subnotebook, and Palmtop  
Computers  
C1-  
4
T1IN  
T2IN  
T3IN  
T1OUT  
T2OUT  
5
High-Speed Modems  
Battery-Powered Equipment  
Hand-Held Equipment  
Peripherals  
MAX3238  
6
T3OUT  
R1IN  
7
21 R1OUT  
8
9
20  
R2IN  
R2OUT  
Printers  
19  
10  
11  
12  
13  
14  
T4IN  
18 R3OUT  
T5IN  
T4OUT  
R3IN  
Typical Operating Circuit appears at end of data sheet.  
17  
T5OUT  
FORCEON  
FORCEOFF  
16 R1OUTB  
15  
INVALID  
AutoShutdown Plus is a trademark of Maxim Integrated Products.  
SSOP  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...12

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