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参数资料
| 型号： | MAX1482 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low Power, Slew-Rate-Limited RS-485 Transceivers(250kbps，半双工，RS-485收发器) |
| 中文描述： | 20µA、1/8单位负载、限摆率、RS-485收发器 |
| 文件页数： | 9/12页 |
| 文件大小： | 142K |
| 代理商： | MAX1482 |
Low-Power S hutdown Mode
A low-power shutdown mode is initiated by bringing RE
high and DE low. The devices will not shut down unless
both
the driver and receiver are disabled. In shut-
down, the devices typically draw only 0.1μA 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 shut-
down.
For the receiver, the t
ZH
and t
ZL
enable times assume
the part was not in the low-power shutdown state. The
t
ZH(SHDN)
and t
ZL(SHDN)
enable times assume the
parts were shut down (see Electrical Characteristics).
It takes the receivers longer to become enabled from
the low-power shutdown state (t
ZH(SHDN)
, t
ZL(SHDN)
)
than from the operating mode (t
ZH
, t
ZL
). (The parts are
in operating mode if the RE , DE inputs equal a logical
0,1 or 1,1 or 0,0.)
Driver Output Protec tion
Excessive output current and power dissipation caused
by faults or by bus contention are prevented by two
mechanisms. 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). In addition, a ther-
mal shutdown circuit forces the driver outputs into a
high-impedance state if the die temperature rises
excessively.
Propagation Delay
Digital encoding schemes depend on the driver and
receiver skew. Skew is defined as the difference
between the rising and falling propagation delay times.
Typical propagation delays are shown in Figures 11
and 12 using Figure 10’s test circuit.
The difference in receiver delay times, |t
PLH
- t
PHL
| is
typically under 160ns.
The driver skew times are typically 160ns (800ns max).
M
20μA,
1
8
-Unit-Load, S lew-Rate-Limited
RS -485 Transc eivers
_______________________________________________________________________________________
9
RO
5V/div
B
A
500mV/div
500ns/div
RO
5V/div
A
B
500mV/div
500ns/div
Figure 11. Receiver t
PHL
Figure 12. Receiver t
PLH
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1483 | Low Power, Slew-Rate-Limited RS-486 Transceivers(250kbps，半双工，RS-485收发器) |
| MAX1482CPD | 20A, 1.8-Unit-Load, Slew-Rate-Limited RS-485 Transceivers |
| MAX1482CSD | 20A, 1.8-Unit-Load, Slew-Rate-Limited RS-485 Transceivers |
| MAX1483CSA | 20A, 1.8-Unit-Load, Slew-Rate-Limited RS-485 Transceivers |
| MAX1482ESD | 20A, 1.8-Unit-Load, Slew-Rate-Limited RS-485 Transceivers |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX14820EETG+T | 制造商:Maxim Integrated Products 功能描述: |
| MAX14820ETG+ | 功能描述:输入/输出控制器接口集成电路 IO-Link Device Transceiver RoHS:否 制造商:Silicon Labs 产品: 输入/输出端数量: 工作电源电压: 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-64 封装:Tray |
| MAX14820ETG+T | 功能描述:输入/输出控制器接口集成电路 IO-Link Device Transceiver RoHS:否 制造商:Silicon Labs 产品: 输入/输出端数量: 工作电源电压: 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-64 封装:Tray |
| MAX14820EVKIT# | 功能描述:界面开发工具 MAX14820/21 EVAL KIT RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| MAX14821ETG+ | 功能描述:输入/输出控制器接口集成电路 NEW RoHS:否 制造商:Silicon Labs 产品: 输入/输出端数量: 工作电源电压: 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-64 封装:Tray |
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