參數(shù)資料
型號(hào)： HWD490ESA
廠商： Electronic Theatre Controls, Inc.
元件分類： RS-485
英文描述： Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
中文描述： 低功耗，限擺率限制RS-485/RS-422收發(fā)器
文件頁(yè)數(shù)： 11/20頁(yè)
文件大?。?/td> 502K
代理商： HWD490ESA
Low-Power S hutdown Mode
(HWD481/HWD483/HWD487)
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 HWD481, HWD483, and HWD487, the t
ZH
and
t
ZL
enable times assume the part was not in the low-
power shutdown state (the HWD485/HWD488–HWD491
and HWD1487 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 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
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 HWD481, HWD485,
HWD490, HWD491, and HWD1487 and is typically less
than 100ns for the HWD483 and HWD487–HWD489.
The driver skew times are typically 5ns (10ns max) for
the HWD481, HWD485, HWD490, HWD491, and
HWD1487, and are typically 100ns (800ns max) for the
HWD483 and HWD487–HWD489.
Low-Power, S lew-Rate-Limited
RS -485/RS -422 Transc eivers
10dB/div
0Hz
5MHz
500kHz/div
10dB/div
0Hz
5MHz
500kHz/div
Figure 12. Driver Output Waveform and FFT Plot of HWD481/
HWD485/HWD490/HWD491/HWD1487 Transmitting a 150kHz
Signal
Figure 13. Driver Output Waveform and FFT Plot of HWD483/
HWD487–HWD489 Transmitting a 150kHz Signal
11
相關(guān)PDF資料
PDF描述
HWD490MJA Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
HWD491 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
HWD491CPD Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
HWD491CSD Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
HWD491EPD Low-Power, 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
HWD490MJA 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
HWD491 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
HWD491C/D 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
HWD491CPD 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
HWD491CSD 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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