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參數(shù)資料
| 型號： | MAX4838EXT-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Overvoltage Protection Controllers with Status FLAG |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | SC-70, 6 PIN |
| 文件頁數(shù)： | 11/19頁 |
| 文件大?。?/td> | 439K |
| 代理商： | MAX4838EXT-T |
Low-Power Shutdown Mode
(MAX481/MAX483/MAX487)
A low-power shutdown mode is initiated by bringing
both
RE
high and DE low. The devices will not shut
down unless both the driver and receiver are disabled.
In shutdown, 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
shutdown.
For the MAX481, MAX483, and MAX487, the t
ZH
and
t
ZL
enable times assume the part was not in the low-
power shutdown state (the MAX485/MAX488–MAX491
and MAX1487 can not be shut down). The t
ZH(SHDN)
and t
ZL(SHDN)
enable times assume the parts were shut
down (see
Electrical Characteristics
).
It takes the drivers and 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
DE inputs equal a logical 0,1 or 1,1 or 0, 0.)
Driver Output Protection
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
Many digital encoding schemes depend on the differ-
ence between the driver and receiver propagation
delay times. Typical propagation delays are shown in
Figures 15–18 using Figure 14’s test circuit.
The difference in receiver delay times, | t
PLH
- t
PHL
|, is
typically under 13ns for the MAX481, MAX485,
MAX490, MAX491, and MAX1487 and is typically less
than 100ns for the MAX483 and MAX487–MAX489.
The driver skew times are typically 5ns (10ns max) for
the MAX481, MAX485, MAX490, MAX491, and
MAX1487, and are typically 100ns (800ns max) for the
MAX483 and MAX487–MAX489.
M
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
______________________________________________________________________________________
11
10dB/div
0Hz
5MHz
500kHz/div
10dB/div
0Hz
5MHz
500kHz/div
Figure 12. Driver Output Waveform and FFT Plot of MAX481/
MAX485/MAX490/MAX491/MAX1487 Transmitting a 150kHz
Signal
Figure 13. Driver Output Waveform and FFT Plot of MAX483/
MAX487–MAX489 Transmitting a 150kHz Signal
相關PDF資料 |
PDF描述 |
|---|---|
| MAX483CPA | Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers |
| MAX483 | 3.3/5-V RS-485 Transceiver 8-SOIC -40 to 85 |
| MAX487EEPA | 【15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers |
| MAX485EEPA | 【15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers |
| MAX483EEPA | 【15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4839EXT | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE PROTECTION CONTROLLERS - Rail/Tube |
| MAX4839EXT+T | 功能描述:電源開關 IC - 配電 RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MAX4839EXT-T | 功能描述:電源開關 IC - 配電 RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MAX483C/D | 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX483CPA | 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
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