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MAX3185CAP 参数 Datasheet PDF下载

MAX3185CAP图片预览
型号: MAX3185CAP
PDF下载: 下载PDF文件 查看货源
内容描述: 【 15kV ESD保护,符合EMC标准, 230kbps的RS - 232串行端口的主板/台式电脑 [【15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs]
分类和应用: 线路驱动器或接收器驱动程序和接口接口集成电路光电二极管电脑信息通信管理PC
文件页数/大小: 8 页 / 67 K
品牌: MAXIM [ MAXIM INTEGRATED PRODUCTS ]
 浏览型号MAX3185CAP的Datasheet PDF文件第1页浏览型号MAX3185CAP的Datasheet PDF文件第2页浏览型号MAX3185CAP的Datasheet PDF文件第3页浏览型号MAX3185CAP的Datasheet PDF文件第4页浏览型号MAX3185CAP的Datasheet PDF文件第5页浏览型号MAX3185CAP的Datasheet PDF文件第7页浏览型号MAX3185CAP的Datasheet PDF文件第8页  
±15kV ESD-Prote c te d, EMC-Com plia nt, 230kbps  
RS-232 Se ria l Port for Mothe rboa rds /De s ktop PCs  
Human Body Model  
Figure 2a shows the Human Body Model, and Figure  
2b shows the current waveform it generates when dis-  
charged into a low impedance. This model consists of  
a 100pF capacitor charged to the ESD voltage of inter-  
est, which is then discharged into the device through a  
1.5kresistor.  
Machine Model  
The Machine Model for ESD testing uses a 200pF stor-  
age capacitor and zero-discharge resistance. It mimics  
the stress caused by handling during manufacturing  
and assembly. Of course, all pins (not just RS-232  
inputs and outputs) require this protection during man-  
ufacturing. Therefore, the Machine Model is less rele-  
vant to the I/O ports than are the Human Body Model  
and IEC1000-4-2.  
IEC1000-4-2  
The IEC1000-4-2 standard covers ESD testing and per-  
formance of finished equipment; it does not specifically  
refer to integrated circuits. The MAX3185 helps you  
design equipment that meets Level 4 (the highest level)  
of IEC1000-4-2, without additional ESD-protection com-  
ponents.  
MAX3185  
__________Ap p lic a t io n s In fo rm a t io n  
Use proper layout to ensure other devices on your  
board are not damaged in an ESD strike. Currents as  
high as 60A can instantaneously pass into ground, so  
be sure to minimize the ground-lead return path to the  
power supply. A separate return path to the power sup-  
ply is recommend. Trace widths should be greater than  
40 mils. Bypass V , V , and V with 0.1µF capaci-  
The ma in d iffe re nc e b e twe e n te s ts d one us ing the  
Human Body Model and IEC1000-4-2 is higher peak  
current in IEC1000-4-2. Because series resistance is  
lower in the IEC1000-4-2 ESD test model (Figure 1a),  
the ESD withstand voltage measured to this standard is  
generally lower than that measured using the Human  
Body Model. Figure 1b shows the current waveform for  
the ±8kV IEC1000-4-2 Level 4 ESD Contact-Discharge  
test.  
CC DD  
SS  
tors as close to the part as possible to ensure maxi-  
mum ESD protection.  
Tie any unused transmitter inputs to GND or V . No  
CC  
external protection diodes are needed because the  
MAX3185 is not sensitive to power-supply sequencing.  
The Air-Gap test involves approaching the device with a  
charge probe. The Contact-Discharge method connects  
the probe to the device before the probe is energized.  
R 1M  
C
R 1500Ω  
D
I 100%  
P
90%  
PEAK-TO-PEAK RINGING  
(NOT DRAWN TO SCALE)  
I
r
DISCHARGE  
RESISTANCE  
CHARGE-CURRENT  
LIMIT RESISTOR  
AMPERES  
HIGH-  
VOLTAGE  
DC  
DEVICE  
UNDER  
TEST  
36.8%  
C
100pF  
STORAGE  
CAPACITOR  
s
10%  
0
SOURCE  
TIME  
0
t
RL  
t
DL  
CURRENT WAVEFORM  
Figure 2b. Human Body Model Current Waveform  
Figure 2a. Human Body ESD Test Model  
6
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