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MAX1488ECSD 参数 Datasheet PDF下载

MAX1488ECSD图片预览
型号: MAX1488ECSD
PDF下载: 下载PDF文件 查看货源
内容描述: ± 15kV ESD保护,四路,低功耗RS - 232线路驱动器 [【15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver]
分类和应用: 驱动器
文件页数/大小: 8 页 / 107 K
品牌: MAXIM [ MAXIM INTEGRATED PRODUCTS ]
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±1 5 k V ES D-P ro t e c t e d , Qu a d , Lo w -P o w e r  
RS -2 3 2 Lin e Drive r  
MAX148E  
R
C
1M  
R
D
1500  
R
C
50M to 100M  
R 330Ω  
D
DISCHARGE  
RESISTANCE  
CHARGE-CURRENT  
LIMIT RESISTOR  
DISCHARGE  
RESISTANCE  
CHARGE-CURRENT  
LIMIT RESISTOR  
HIGH-  
VOLTAGE  
DC  
HIGH-  
VOLTAGE  
DC  
DEVICE  
UNDER  
TEST  
DEVICE  
UNDER  
TEST  
C
s
100pF  
STORAGE  
CAPACITOR  
C
s
150pF  
STORAGE  
CAPACITOR  
SOURCE  
SOURCE  
Figure 2a. Human Body ESD Test Model  
Figure 3a. IEC1000-4-2 ESD Test Model  
I
100%  
90%  
I 100%  
P
90%  
PEAK-TO-PEAK RINGING  
(NOT DRAWN TO SCALE)  
I
r
AMPERES  
36.8%  
10%  
0
10%  
TIME  
0
t = 0.7ns to 1ns  
r
t
RL  
t
30ns  
60ns  
t
DL  
CURRENT WAVEFORM  
Figure 2b. Human Body Model Current Waveform  
Figure 3b. IEC1000-4-2 ESD Generator Current Waveform  
IEC1000-4-2  
Machine Model  
The IEC1000-4-2 standard covers ESD testing and per-  
formance of finished equipment; it does not specifically  
refer to integrated circuits. The MAX1488E helps you  
design equipment that meets Level 4 (the highest level)  
of IEC1000-4-2, without additional ESD-protection com-  
ponents.  
The Machine Model for ESD testing uses a 200pF stor-  
age capacitor and zero-discharge resistance. Its objec-  
tive is to mimic the s tre s s c a us e d b y c onta c t tha t  
occurs with handling and assembly during manufactur-  
ing. Of course, all pins (not just RS-232 inputs and out-  
p uts) re q uire this p rote c tion during ma nufa c turing .  
Therefore, the Machine Model is less relevant to the I/O  
ports than the Human Body Model and IEC1000-4-2.  
The major difference between tests done using 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 3a),  
the ESD withstand voltage measured to this standard is  
generally lower than that measured using the Human  
Body Model. Figure 3b shows the current waveform for  
the ±6kV IEC1000-4-2 Level 4 ESD Contact-Discharge  
test.  
__________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 the ground,  
so it is important to minimize the ground-lead return  
path to the power supply. A separate return path to the  
power supply is recommended. Trace widths should be  
The Air-Gap test involves approaching the device with  
a charged probe. The Contact-Discharge method con-  
nects the probe to the device before the probe is ener-  
gized.  
greater than 40 mils. V  
and V must be bypassed  
CC  
EE  
with 0.1µF capacitors as close to the part as possible to  
ensure maximum ESD protection.  
_______________________________________________________________________________________  
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