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參數(shù)資料
| 型號： | MAX3084EPA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | Fail-Safe, High-Speed 10Mbps, Slew-Rate-Limited RS-485/RS-422 Transceivers |
| 中文描述： | LINE TRANSCEIVER, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大小： | 275K |
| 代理商： | MAX3084EPA |
M
Low-Power S hutdown Mode
(exc ept MAX 3082/MAX 3085/MAX 3088)
Low-power shutdown mode is initiated by bringing both
RE
high and DE low. In shutdown, the devices typically
draw only 1nA of supply current.
RE
and DE may be driven simultaneously; the parts are
guaranteed not to enter shutdown if
RE
is high and DE
is low for less than 50ns. If the inputs are in this state
for at least 600ns, the parts are guaranteed to enter
shutdown.
Enable times t
ZH
and t
ZL
in the Switching Char-
acteristics tables assume the part was not in a low-
power shutdown state. Enable times t
ZH(SHDN)
and
t
ZL(SHDN)
assume the parts were shut down. It takes
drivers and receivers longer to become enabled from
low-power shutdown mode (t
ZH(SHDN)
, t
ZH(SHDN)
) than
from driver/receiver-disable mode (t
ZH
, t
ZL
).
Driver Output Protec tion
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus con-
tention. The first, a foldback current limit on the output
stage, provides immediate protection against short cir-
cuits over the whole common-mode voltage range (see
Typical Operating Characteristics). The second, a ther-
mal shutdown circuit, forces the driver outputs into a
high-impedance state if the die temperature becomes
excessive.
Line Length vs. Data Rate
The RS-485/RS-422 standard covers line lengths up to
4000 feet. For line lengths greater than 4000 feet, use
the repeater application shown in Figure 17.
Figures 18, 19, and 20 show the system differential volt-
age for the parts driving 4000 feet of 26AWG twisted-
pair wire at 110kHz into 120
loads.
T ypic al Applic ations
The MAX3082/MAX3085/MAX3088/MAX3089 trans-
ceivers are designed for bidirectional data communica-
tions on multipoint bus transmission lines. Figures 21
and 22 show typical network applications circuits.
These parts can also be used as line repeaters, with
cable lengths longer than 4000 feet, as shown in Figure 17.
To minimize reflections, the line should be terminated at
both ends in its characteristic impedance, and stub
lengths off the main line should be kept as short as
possible. The slew-rate-limited MAX3082/MAX3085,
and the two modes of the MAX3089, are more tolerant
of imperfect termination.
Fail-S afe, High-S peed (10Mbps),
S lew-Rate-Limited RS -485/RS -422 Transc eivers
18
______________________________________________________________________________________
120
120
DATA IN
DATA OUT
R
D
RO
RE
DE
DI
A
B
Z
Y
MAX3080/MAX3081/MAX3083/
MAX3084/MAX3086/MAX3087/
MAX3089 (FULL DUPLEX)
NOTE: RE AND DE ON MAX3080/MAX3083/MAX3086/MAX3089 ONLY.
Figure 17. Line Repeater for MAX3080/MAX3081/
MAX3083/MAX3084/MAX3086/MAX3087, and MAX3089
in Full-Duplex Mode
5
μ
s/div
V
A
- V
B
DI
RO
1V/div
5V/div
5V/div
MAX3080/3089 FIG-18
Figure 18. MAX3080/MAX3081/MAX3082, and MAX3089
with SRL = Unconnected, System Differential Voltage at 50kHz
Driving 4000 feet of Cable
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX3084ESA | Fail-Safe, High-Speed 10Mbps, Slew-Rate-Limited RS-485/RS-422 Transceivers |
| MAX3085CPA | Replaced by TMS320C6713B : Floating-Point Digital Signal Processor 272-BGA |
| MAX3085CSA | Fail-Safe, High-Speed 10Mbps, Slew-Rate-Limited RS-485/RS-422 Transceivers |
| MAX3085EPA | Fail-Safe, High-Speed 10Mbps, Slew-Rate-Limited RS-485/RS-422 Transceivers |
| MAX3085ESA | Fail-Safe, High-Speed 10Mbps, Slew-Rate-Limited RS-485/RS-422 Transceivers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3084EPA+ | 功能描述:RS-422/RS-485 接口 IC Fail-Safe 10Mbps RS-485/RS-422 Tcvr 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 |
| MAX3084ESA | 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 |
| MAX3084ESA+ | 功能描述:RS-422/RS-485 接口 IC Fail-Safe 10Mbps RS-485/RS-422 Tcvr 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 |
| MAX3084ESA+T | 功能描述:RS-422/RS-485 接口 IC Fail-Safe 10Mbps RS-485/RS-422 Tcvr 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 |
| MAX3084ESA-T | 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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