參數(shù)資料
型號(hào)： MAX1480A
廠商： Maxim Integrated Products, Inc.
英文描述： Complete, Isolated RS-485/RS-422 Data Interface(半雙工，完全隔離的RS-485/422收發(fā)器)
中文描述： 完備的隔離型、RS-485/RS-422數(shù)據(jù)接口
文件頁(yè)數(shù)： 17/20頁(yè)
文件大?。?/td> 315K
代理商： MAX1480A
M
Complete, Isolated,
RS -485/RS -422 Data Interfac e
______________________________________________________________________________________
17
Driver Output Protec tion
There are two mechanisms to prevent excessive output
current and power dissipation caused by faults or by
bus contention. A foldback current limit on the output
stage provides immediate protection against short cir-
cuits over the entire common-mode range (see Typical
Operating Characteristics). In addition, a thermal shut-
down circuit forces the driver outputs into a high-
impedance state if the die temperature rises
excessively.
Propagation Delay S kew
Typical propagation delays are shown in the Typical
Operating Characteristics using the test circuit of
Figure 5. Propagation delay skew is simply the differ-
ence between the low-to-high and high-to-low propaga-
tion delay. Small driver/receiver skew times help
reduce EMI and reflections by maintaining balanced
differential signals.
The receiver skew time,
I
t
PLH
- t
PHL
I
, is typically under
100ns for the MAX1480A/MAX1490A and under 1μs for
the MAX1480B/MAX1490B.
The driver skew time is typically 25ns for the
MAX1480A/MAX1490A and 100ns for the MAX1480B/
MAX1490B.
__________Applic ations Information
DI and DE are intended to be driven through a
series current-limiting resistor. Directly grounding
these pins destroys the device.
The MAX1480A/MAX1480B are designed for bidirec-
tional data communications on multipoint bus-transmis-
sion lines. The MAX1490A/MAX1490B are designed for
full-duplex bidirectional communications that are pri-
marily point-to-point. Figures 13 and 14 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 pos-
sible. The slew-rate-limited MAX1480B/MAX1490B are
more tolerant of imperfect termination and stubs off the
main line.
Layout Considerations
The MAX1480A/MAX1480B/MAX1490A/MAX1490B
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 MAX1480A/
MAX1480B/MAX1490A/MAX1490B. Connections
SHIELD (OPTIONAL)
NOTE: RESISTORS R5 AND R6 PROTECT
THE MAX1490 FROM TRANSIENT
CURRENTS BETWEEN SHIELD AND
TRANSMISSION LINES.
120
120
120
A
B
Z
Y
Y
Z
R3
R4
R5, 100
SH1
SH2
R1
R2
R6, 100
DI
′
V
IN
5V
22uF
0.1uF
C1
C2
MAX
LOGIC GROUND
ISOLATION BARRIER
ISOLATED COMMON
DRIVER INPUT
RECEIVER OUTPUT
DI
RO
74HC86
OR EQUIVALENT
SHIELD (OPTIONAL)
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
AC1 (MAKE NOCONNECTION)
AC2 (MAKE NOCONNECTION)
ISOV
CC1
ISORODRV
D2
D1
V
CC2
V
CC1
A
B
Z
Y
V
CC3
SD
FS
GND1
16
15
14
13
9
10
11
12
ISOCOM1
ISODI DRV
ISOV
CC2
ISOROLED
GND2
RO
V
CC4
DI
M
M
M
D
DI
RO
120
B
A
R
Figure 14. Typical Full-Duplex RS-485/RS-422 Network
相關(guān)PDF資料
PDF描述
MAX1480B Complete, Isolated RS-485/RS-422 Data Interface(半雙工，完全隔離的RS-485/422收發(fā)器)
MAX1480C Complete, Isolated RS-485/RS-422 Data Interface(半雙工，完全隔離的RS-485/422收發(fā)器)
MAX1490A Complete, Isolated RS-485/RS-422 Data Interface(2.5Mbps，全雙工，完全隔離的RS-485/422收發(fā)器)
MAX1490B Complete, Isolated RS-485/RS-422 Data Interface(2.5Mbps，全雙工，完全隔離的RS-485/422收發(fā)器)
MAX148 +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs(8通道，133ksps，串行10位A/D轉(zhuǎn)換器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1480ACPI 功能描述:RS-422/RS-485 接口 IC 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
MAX1480ACPI+ 功能描述:RS-422/RS-485 接口 IC Isolated RS-422/485 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
MAX1480AEPI 功能描述:RS-422/RS-485 接口 IC 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
MAX1480AEPI+ 功能描述:RS-422/RS-485 接口 IC Isolated RS-422/485 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
MAX1480BCPI 功能描述:RS-422/RS-485 接口 IC 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
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