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參數資料
| 型號： | MAX3228E |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 【15kV ESD-Protected @.5V to %.5V RS-232 Transceivers in UCSP |
| 中文描述： | ±15kV ESD保護、+2.5V至+5.5V、RS-232收發(fā)器，UCSP和WLP封裝 |
| 文件頁數： | 10/15頁 |
| 文件大?。?/td> | 251K |
| 代理商： | MAX3228E |
M
±15kV ESD-Protected +2.5V to +5.5V
RS-232 Transceivers in UCSP
IEC 1000-4-2
The IEC 1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX3228E/MAX3229E
help you design equipment that meets Level 4 (the high-
est level) of IED 1000-4-2, without the need for addition-
al ESD-protection components.
The major difference between tests done using the
Human Body Model and IEC 1000-4-2 is a higher peak
current in IEC 1000-4-2, because series resistance is
lower in the IEC 1000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC 1000-4-2 is generally
lower than that measured using the Human Body Model.
Figure 6a shows the IEC 1000-4-2 model, and Figure 6b
shows the current waveform for the ±8kV IEC 1000-4-2
Level 4 ESD contact discharge test.
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.
Machine Model
The Machine Model for ESD tests all pins using a 200pF
storage capacitor and zero discharge resistance. Its
objective is to emulate the stress caused by contact that
occurs with handling and assembly during manufactur-
ing. Of course, all pins require this protection during
manufacturing, not just RS-232 inputs and outputs.
Therefore, after PC board assembly, the Machine Model
is less relevant to I/O ports.
Applications Information
Capacitor Selection
The capacitor type used for C1
–
C4 is not critical for
proper operation; either polarized or non polarized
capacitors may be used. However, ceramic chip
capacitors with an X7R or X5R dielectric work best. The
charge pump requires 0.1μF capacitors for 3.3V opera-
tion. For other supply voltages, refer to Table 4 for
required capacitor values. Do not use values smaller
than those listed in Table 4. Increasing the capacitor
values (e.g., by a factor of 2) reduces ripple on the
transmitter outputs and slightly reduces power con-
sumption. C2, C3, and C4 can be increased without
changing C1
’
s value.
However, do not increase C1
without also increasing the values of C2, C3, and C4
to maintain the proper ratios (C1 to the other capac-
itors).
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor
’
s equiv-
alent series resistance (ESR) usually rises at low
temperatures and influences the amount of ripple on
V+ and V-.
Power-Supply Decoupling
In most circumstances, a 0.1μF V
CC
bypass capacitor
is adequate. In applications that are sensitive to power-
supply noise, use a capacitor of the same value as the
charge-pump capacitor C1. Connect bypass capaci-
tors as close to the IC as possible.
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
150pF
R
C
50M
to 100M
R
D
330
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 6a. IEC 1000-4-2 ESD Test Model
tr = 0.7ns to 1ns
30ns
60ns
t
100%
90%
10%
I
P
I
Figure 6b. IEC 1000-4-2 ESD Generator Current Waveform
V
CC
(V)
2.5 to 3.0
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
C1, C
BYPASS
(μF)
0.22
0.1
0.047
0.22
C2, C3, C4 (μF)
0.22
0.1
0.33
1
Table 4. Required Capacitor Values
10
_____________________________________________________________________________________
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX3228EBV | 制造商:Maxim Integrated Products 功能描述:+2.5V TO +5.5V RS-232 TRANSCEIVERS - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX3228EBV+ | 制造商:Maxim Integrated Products 功能描述:LINE TRANSMITTER/RCVR 2TR 2TX 2RX 30UCSP - Rail/Tube |
| MAX3228EBV+T | 功能描述:RS-232接口集成電路 Integrated Circuits (ICs) RoHS:否 制造商:Exar 數據速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3228EBV-T | 功能描述:RS-232接口集成電路 2.5-5.5V Transceiver RoHS:否 制造商:Exar 數據速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3228EEBV | 制造商:Maxim Integrated Products 功能描述::15KV ESD, +2.5V TO +5.5V 2TX/2RX RS-232 TRA - Bulk 制造商:Rochester Electronics LLC 功能描述: |
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