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MAX3238E

更新时间： 2024-09-16 14:57:43
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14页 244K
描述
+3.0V至+5.5V、10nA、250kbps RS-232收发器，带有±15kV ESD保护、输入/输出和逻辑引脚

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MAX3238E 数据手册

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19-1632; Rev 1; 6/01  
+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers  
with 15kV ESD-ꢀrotected I/O and Logic ꢀins  
General Description  
Features  
The MAX3238E/MAX3248E transceivers use Maxim’s  
revolutionary AutoShutdown Plus™ feature to achieve  
10nA supply current. These devices shut down the on-  
board power supply and drivers when they do not sense  
a valid signal transition on either the receiver or transmit-  
ter inputs. This occurs if the RS-232 cable is disconnect-  
ed or if the transmitters of the connected peripheral are  
turned off. The devices turn on again when a valid transi-  
tion is applied to any RS-232 receiver or transmitter input.  
AutoShutdown Plus automatically achieves this power  
savings through its on-board circuitry, as no changes are  
required to the existing BIOS or operating system.  
ꢀ Enhanced ESD Protection on RS-232 I/O Pins and  
All Logic Pins  
15kV—Human Body Model  
8kV—IEC 1000-4-2 Contact Discharge  
15kV—IEC 1000-4-2 Air-Gap Discharge  
ꢀ Guaranteed Data Rate: 250kbps  
ꢀ 10nA Low-Power Shutdown with Receivers Active  
ꢀ Schmitt Triggers on All Inputs  
ꢀ Flow-Through Pinout  
ꢀ Meets EIA/TIA-232 Specifications Down to 3.0V  
ꢀ Guaranteed 6V/µs Slew Rate  
All RS-232 inputs and outputs, as well as the logic I/O  
pins, have enhanced ESD protection to 1ꢀ5k. The addi-  
tional ESD protection on the logic I/O pins ma5es the  
MAX3238E/MAX3248E ideal for cell phone data cable  
applications because it eliminates the need for costly  
ꢀ Low-Level Logic Thresholds (MAX3248E)  
ꢀ RS-232-Compatible Outputs to 2.7V  
™
external TransZorb or protection schemes.  
The MAX3238E/MAX3248E contain five drivers and three  
receivers and are 3k-powered EIA/TIA-232 and k.28/k.24  
communication interfaces intended for cell phones, data  
cables, and modem applications. A proprietary, high-effi-  
ciency, dual charge-pump power supply and a low-  
dropout transmitter combine to deliver true RS-232  
performance from a single +3.0k to +ꢀ.ꢀk supply. A  
guaranteed data rate of 2ꢀ05bps provides compatibility  
with popular software for communicating with personal  
computers.  
Ordering Information  
PART  
TEMP. RANGE  
0°C to +70°C  
-40°C to +8ꢀ°C  
0°C to +70°C  
-40°C to +8ꢀ°C  
PIN-PACKAGE  
MAX3238ECAI  
MAX3238EEAI  
MAX3248ECAI  
MAX3248EEAI  
28 SSOP  
28 SSOP  
28 SSOP  
28 SSOP  
Typical Operating Circuit appears at end of data sheet.  
The MAX3238E and the MAX3248E differ only in their  
input logic thresholds. The MAX3238E has standard logic  
thresholds, while the MAX3248E has low-level logic  
thresholds of 0.6k to 1.2k, which are ideal for 1.8k sys-  
tems.  
The transmitter inputs, FORCEON, and FORCEOFF have  
a 4005Ω active positive feedbac5 resistor. Once driven to  
a valid logic level, they will retain this level if the driving  
signal is removed or goes high impedance. Unused  
transmitter and logic inputs may be left unconnected. The  
MAX3238E/MAX3248E can operate with supply voltages  
ranging from +3.0k to +ꢀ.ꢀk.  
___________________ꢀin Configuration  
TOP VIEW  
C2+  
GND  
C2-  
V-  
28  
27  
26  
25  
24  
23  
22  
1
2
C1+  
V+  
V
CC  
3
C1-  
4
T1IN  
T2IN  
T3IN  
T1OUT  
T2OUT  
5
MAX3238E  
MAX3248E  
6
T3OUT  
R1IN  
7
Applications  
21 R1OUT  
8
Cellular Data Cables  
Modems  
Battery-Powered Equipment  
Peripherals  
Data Cradles  
Printers  
9
20  
R2IN  
R2OUT  
19  
10  
T4IN  
T4OUT  
R3IN 11  
18 R3OUT  
T5IN  
12  
13  
14  
17  
16  
15  
T5OUT  
FORCEON  
FORCEOFF  
AutoShutdown Plus  
is a trademark of Maxim Integrated Products.  
R1OUTB  
INVALID  
TransZorb is a trademark of General Semiconductor Industries, Inc.  
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...14

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