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参数资料
| 型号： | MAX13234EETP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | TXRX RS-232 250KBPS 2X2 20TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 托盘 |
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Human Body Model
Figure 8a shows the Human Body Model and Figure 8b
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 test device
through a 1.5k resistor.
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment; it does not specifi-
cally refer to integrated circuits. The MAX13234E–
MAX13237E helps design equipment that meets Level
4 (the highest level) of IEC 61000-4-2, without the need
for additional ESD-protection components. The major
difference between tests done using the Human Body
Model and IEC 61000-4-2 is higher peak current in IEC
61000-4-2, because series resistance is lower in the
IEC 61000-4-2 model. Hence, the ESD withstand volt-
age measured to IEC 61000-4-2 is generally lower than
that measured using the Human Body Model. Figure 9a
shows the IEC 61000-4-2 model and Figure 9b shows
the current waveform for the 8kV, IEC 61000-4-2, Level
4, ESD Contact-Discharge Method.
The Air-Gap Method involves approaching the device
with a charged probe. The Contact-Discharge Method
connects the probe to the device before the probe is
energized.
Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation; polarized or non-polarized capacitors
can be used. The charge pump requires 0.1F capaci-
tors for VCC = +3.3V operation. For other supply volt-
ages, see Table 2 for required capacitor values. Do not
use values smaller than those listed in Table 2.
Increasing the capacitor values (e.g., by a factor of 2)
reduces ripple on the transmitter outputs and slightly
reduces power consumption. 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, C4, CBYPASS1, and CBYPASS2 to maintain
the proper ratios (C1 to the other capacitors). When
using the minimum required capacitor values, make
sure the capacitor value does not degrade excessively
with temperature. If in doubt, use capacitors with a
larger nominal value. The capacitor’s equivalent series
resistance (ESR), usually rises at low temperatures
influencing the amount of ripple on V+ and V-.
Power-Supply Decoupling
In most circumstances, a 0.1F VCC bypass capacitor
and a 1F VL bypass capacitor are adequate. In appli-
cations that are sensitive to power-supply noise, use
capacitors of the same value as charge-pump capaci-
tor C1. Connect bypass capacitors as close to the IC
as possible.
Transmitter Outputs when Exiting
Shutdown
Figure 10 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232 lev-
els (one transmitter input is high, the other is low). Each
transmitter is loaded with 3k in parallel with 1000pF.
The transmitter outputs display no ringing or undesir-
able transients as they come out of shutdown. Note that
the transmitters are enabled only when the magnitude
of V- exceeds approximately -3V.
MAX13234E–MAX13237E
3Mbps RS-232 Transceivers with
Low-Voltage Interface
______________________________________________________________________________________
13
VCC
(V)
C1, CBYPASS2
(F)
CBYPASS1
(F)
C2, C3, C4
(F)
3.0 to 3.6
0.22
3.15 to 3.6
0.1
4.5 to 5.5
0.047
1
0.33
3.0 to 5.5
0.22
1
Table 2. Required Minimum Capacitance
Values
5
s/div
T1OUT
FORCEON = FORCEOFF
T2OUT
READY
5V/div
0
2V/div
0
5V/div
0
VCC = 3.3V
C1–C4 = 0.1
F
Figure 10. Transmitter Outputs when Exiting Shutdown or
Powering Up
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX13234EETP+ | 功能描述:RS-232接口集成电路 3-5.5V 250Kbps RS232 Line Driver/Receiver 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: |
| MAX13234EETP+T | 功能描述:RS-232接口集成电路 3-5.5V 250Kbps RS232 Line Driver/Receiver 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: |
| MAX13234EETP-T | 功能描述:RS-232接口集成电路 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: |
| MAX13234EEUP | 功能描述:RS-232接口集成电路 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: |
| MAX13234EEUP+ | 功能描述:RS-232接口集成电路 3-5.5V 250Kbps RS232 Line Driver/Receiver 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: |
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