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| 型号： | SP3238ECA-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 INTELLIGENT 28SSOP |
| 标准包装： | 1,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 5/3 |
| 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) |
| 其它名称： | SP3238ECA-L/TR-ND |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP3238E_100_020111
15
ESD TOLERANCE
The SP3238E device incorporates ruggedized
ESD cells on all driver output and receiver input
pins. The ESD structure is improved over our
previous family for more rugged applications
and environments sensitive to electro-static dis-
chargesandassociatedtransients.Theimproved
ESD tolerance is at least +15kV without damage
nor latch-up.
There are different methods of ESD testing ap-
plied:
a) MIL-STD-883, Method 3015.7
b) IEC61000-4-2 Air-Discharge
c) IEC61000-4-2 Direct Contact
The Human Body Model has been the generally
accepted ESD testing method for semi-con-
ductors. This method is also specified in
MIL-STD-883, Method 3015.7 for ESD testing.
The premise of this ESD test is to simulate the
human body’s potential to store electro-static
energy and discharge it to an integrated circuit.
The simulation is performed by using a test
model as shown in Figure 19.
This method
will test the IC’s capability to withstand an ESD
transient during normal handling such as in
manufacturing areas where the IC's tend to be
handled frequently.
The IEC-61000-4-2, formerly IEC801-2, is gen-
erally used for testing ESD on equipment and
systems. For system manufacturers, they must
guarantee a certain amount of ESD protection
since the system itself is exposed to the outside
environment and human presence. The premise
with IEC61000-4-2 is that the system is required
to withstand an amount of static electricity when
ESD is applied to points and surfaces of the
equipment that are accessible to personnel dur-
ing normal usage. The transceiver IC receives
most of the ESD current when the ESD source
is applied to the connector pins. The test circuit
for IEC61000-4-2 is shown on Figure 20. There
are two methods within IEC61000-4-2, the Air
Discharge method and the Contact Discharge
method.
With the Air Discharge Method, an ESD voltage
is applied to the equipment under test (EUT)
throughair. Thissimulatesanelectricallycharged
person ready to connect a cable onto the rear of
the system only to find an unpleasant zap just
before the person touches the back panel. The
high energy potential on the person discharges
through an arcing path to the rear panel of the
system before he or she even touches the sys-
tem. This energy, whether discharged directly
or through air, is predominantly a function of
the discharge current rather than the discharge
voltage. Variables with an air discharge such as
approach speed of the object carrying the ESD
potential to the system and humidity will tend to
change the discharge current. For example, the
rise time of the discharge current varies with the
approach speed.
The Contact Discharge Method applies the ESD
current directly to the EUT. This method was
devised to reduce the unpredictability of the ESD
arc. The discharge current rise time is constant
since the energy is directly transferred without the
air-gap arc. In situations such as hand held sys-
tems, the ESD charge can be directly discharged
to the equipment from a person already holding
the equipment. The current is transferred on to
the keypad or the serial port of the equipment
directly and then travels through the PCB and
finally to the IC.
Figure 19. ESD Test Circuit for Human Body Model
RC
Device
Under
Test
DC Power
Source
CS
RS
SW1
SW2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3238ECY | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3238ECY/TR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3238ECY-L | 功能描述:RS-232接口集成电路 Intel. +3V to +5.5V RS-232 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: |
| SP3238ECY-L/TR | 功能描述:RS-232接口集成电路 Intel. +3V to +5.5V RS-232 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: |
| SP3238EE | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceiver |
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