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參數(shù)資料
| 型號： | ADM3485E |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | ESD Protected, EMC Compliant, 3.3 V, 20 Mbps, EIA RS-485 Transceiver |
| 中文描述： | ESD保護，EMC的兼容，3.3伏，20 Mbps的環(huán)境影響評估的RS - 485收發(fā)器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 119K |
| 代理商： | ADM3485E |
ADM3485E
–8–
REV. A
Table I. Comparison of RS-422 and RS-485 Interface Standards
Specification
RS-422
RS-485
Transmission Type
Maximum Data Rate
Maximum Cable Length
Minimum Driver Output Voltage
Driver Load Impedance
Receiver Input Resistance
Receiver Input Sensitivity
Receiver Input Voltage Range
No. of Drivers/Receivers Per Line
Differential
10 MB/s
4000 ft.
±
2 V
100
4 k
min
±
200 mV
–7 V to +7 V –7 V to +12 V
1/10
Differential
10 MB/s
4000 ft.
±
1.5 V
54
12 k
min
±
200 mV
32/32
Table II. Transmitting Truth Table
Transmitting
Inputs
Outputs
RE
DE
DI
B
A
X
X
0
1
1
1
0
0
1
0
X
X
0
1
Hi-Z
Hi-Z
1
0
Hi-Z
Hi-Z
Table III. Receiving Truth Table
Receiving
Inputs
DE
Outputs
RO
RE
A–B
0
0
0
1
X
X
X
X
> +0.2 V
< –0.2 V
Inputs O/C
X
1
0
1
Hi-Z
ESD/EFT TRANSIENT PROTECTION SCHEME
The ADM3485E uses protective clamping structures on its
inputs and outputs that clamp the voltage to a safe level and
dissipate the energy present in ESD (Electrostatic) and EFT
(Electrical Fast Transients) discharges.
The protection structure achieves ESD protection up to
±
8 kV
according to IEC1000-4-2, and EFT protection up to
±
2 kV on
all I-O lines.
ESD TESTING
Two coupling methods are used for ESD testing, contact dis-
charge and air-gap discharge. Contact discharge calls for a di-
rect connection to the unit being tested. Air-gap discharge uses
a higher test voltage but does not make direct contact with the
unit under test. With air discharge, the discharge gun is moved
toward the unit under test, developing an arc across the air gap,
hence the term air-discharge. This method is influenced by hu-
midity, temperature, barometric pressure, distance and rate of
closure of the discharge gun. The contact-discharge method,
while less realistic, is more repeatable and is gaining acceptance
and preference over the air-gap method.
Although very little energy is contained within an ESD pulse,
the extremely fast rise time, coupled with high voltages, can
cause failures in unprotected semiconductors. Catastrophic
destruction can occur immediately as a result of arcing or heat-
ing. Even if catastrophic failure does not occur immediately, the
device may suffer from parametric degradation, which may
result in degraded performance. The cumulative effects of con-
tinuous exposure can eventually lead to complete failure.
I-O lines are particularly vulnerable to ESD damage. Simply
touching or plugging in an I-O cable can result in a static dis-
charge that can damage or completely destroy the interface
product connected to the I-O port.
It is extremely important, therefore, to have high levels of ESD
protection on the I-O lines.
It is possible that the ESD discharge could induce latchup in the
device under test, so it is important that ESD testing on the I-O
pins be carried out while device power is applied. This type of
testing is more representative of a real-world I-O discharge
where the equipment is operating normally when the discharge
occurs.
TEMPERATURE
–
C
1.20
–
50
70
–
30
I
C
–
–
10
10
30
50
1.15
1.05
1.00
0.95
0.80
1.10
0.90
0.85
90
110
0.75
0.70
I
CC
(mA)
RE
= LO, DE = LO
I
CC
(mA) DE = V
CC
,
RE
= X
Figure 19. Supply Current vs. Temperature
TEMPERATURE
–
C
100
–
40
80
–
20
I
C
–
0
20
40
60
90
70
60
50
20
80
40
30
10
0
I
CC
(mA)
Figure 20. Shutdown Current vs. Temperature
相關(guān)PDF資料 |
PDF描述 |
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| ADM3485EAR | ESD Protected, EMC Compliant, 3.3 V, 20 Mbps, EIA RS-485 Transceiver |
| ADM3485EAN | ESD Protected, EMC Compliant, 3.3 V, 20 Mbps, EIA RS-485 Transceiver |
| ADM3491ARU | 3.3 V, Full Duplex, 840 uA 20 Mbps, EIA RS-485 Transceiver |
| ADM3491 | 3.3 V, Full Duplex, 840 uA 20 Mbps, EIA RS-485 Transceiver |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM3485E_10 | 制造商:AD 制造商全稱:Analog Devices 功能描述:?±15 kV ESD-Protected, 3.3 V,12 Mbps, EIA RS-485/RS-422 Transceiver |
| ADM3485EAN | 制造商:Rochester Electronics LLC 功能描述:3 VOLT RS-485 HIGH ESD I.C. - Bulk 制造商:Analog Devices 功能描述:TRANSCEIVER RS485/422 3.3V 3485 |
| ADM3485EANZ | 制造商:Rochester Electronics LLC 功能描述:3 VOLT RS-485 HIGH ESD I.C. - Bulk 制造商:Analog Devices 功能描述:TRANSCEIVER RS485/422 3.3V 3485 |
| ADM3485EAR | 功能描述:IC TX/RX RS-485 HS 3.3V 8-SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
| ADM3485EAR-REEL | 制造商:Analog Devices 功能描述:Single Transmitter/Receiver RS-422/RS-485 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:3 VOLT RS-485 HIGH ESD I.C. - Tape and Reel 制造商:Analog Devices 功能描述:IC TRANSCEIVER RS485 |
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