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参数资料
| 型号： | MAX1480EAEPI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/19页 |
| 文件大小： | 0K |
| 描述： | IC RS485/RS422 DATA INTRFC 28DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 14 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS422，RS485 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 28-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 28-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 1402 (CN2011-ZH PDF) |
MAX1480E/MAX1490E
±15kV ESD-Protected, Isolated RS-485/RS-422
Data Interfaces
______________________________________________________________________________________
15
___________Applications Information
These E versions of the MAX1480EA/MAX1480EC/
1490EA/MAX1490EB provide extra protection against
ESD. The rugged MAX1480EA/MAX1480EC/MAX1490EA/
MAX1490EB are intended for harsh environments where
high-speed communication is important. These devices
eliminate the need for transient suppressor diodes or the
use of discrete protection components. The standard
(non-E) MAX1480A/MAX1480C/MAX1490A/MAX1490B
are recommended for applications where cost is critical.
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
discharges encountered during handling and assembly.
The driver outputs and receiver inputs have extra protec-
tion against static electricity. Maxim’s engineers devel-
oped state-of-the-art structures to protect these pins
against ESD of ±15kV without damage. The ESD struc-
tures withstand high ESD in all states: normal operation,
shutdown, and powered down. After an ESD event,
Maxim’s
MAX1480EA/MAX1480EC/MAX1490EA/
MAX1490EB keep working without latchup. An isolation
capacitor of 270pF 4kV should be placed between ISO
COM and logic ground for optional performance against
an ESD pulse with respect to logic ground.
ESD protection can be tested in various ways; the trans-
mitter outputs and receiver inputs of this product family
are characterized for protection to ±15kV using the
Human Body Model.
ESD Test Conditions
The ±15kV ESD test specifications apply only to the A, B,
Y, and Z I/O pins. The test surge may be referenced to
either the ISO COM or to the nonisolated GND (Figures 1
and 2).
Human Body Model
Figure 13 shows the Human Body Model, and Figure 14
shows the current waveform it generates when dis-
charged into low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5k
resistor.
Machine Model
The Machine Model for ESD tests all pins using a 200pF
storage capacitor and zero discharge resistance. Its
objective is to simulate the stress caused by contact that
occurs with handling and assembly during manufactur-
ing. All pins require this protection during manufactur-
ing—not just inputs and outputs. Therefore, after PC
board assembly, the Machine Model is less relevant to
I/O ports.
The MAX1480EA/MAX1480EC are designed for bidirec-
tional data communications on multipoint bus-transmis-
sion lines. The MAX1490EA/MAX1490EB are designed
for full-duplex bidirectional communications that are pri-
marily point-to-point. Figures 15 and 16 show half-duplex
and full-duplex typical network application circuits,
respectively. To minimize reflections, terminate the line at
both ends with its characteristic impedance, and keep
stub lengths off the main line as short as possible. The
slew-rate-limited MAX1480EC/MAX1490EB are more tol-
erant of imperfect termination and stubs off the main line.
Layout Considerations
The MAX1480EA/MAX1480EC/MAX1490EA/MAX1490EB
pinouts enable optimal PC board layout by minimizing
interconnect lengths and crossovers:
For maximum isolation, the “isolation barrier” should
not be breached except by the MAX1480EA/
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
RC
RD 1500
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
1M
IP 100%
90%
36.8%
tRL
TIME
tDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
0
AMPERES
Figure 13. Human Body ESD Test Model
Figure 14. Human Body Current Waveform
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1480EAEPI+ | 功能描述:RS-422/RS-485 接口 IC Isolated RS-422/485 Data Interface RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| MAX1480ECCPI | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| MAX1480ECCPI+ | 功能描述:RS-422/RS-485 接口 IC Isolated RS-422/485 Data Interface RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| MAX1480ECEPI | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| MAX1480ECEPI+ | 功能描述:RS-422/RS-485 接口 IC Isolated RS-422/485 Data Interface RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
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