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參數(shù)資料
| 型號(hào)： | MAX1490EBEPG+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RS485/RS422 DATA INTRFC 24DIP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 16 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS422，RS485 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 24-DIP（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 24-PDIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1403 (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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| MAX1490EBEPG+ | 功能描述:RS-422/RS-485 接口 IC Isolated RS-485/422 Data Interface RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX1491CAI | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1491CAI+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 3.5 Digit ADC w/LCD Drivers RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1491CAI+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 3.5 Digit ADC w/LCD Drivers RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1491CAI-T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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