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參數(shù)資料
| 型號： | MAX3362EKA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package |
| 中文描述： | LINE TRANSCEIVER, PDSO8 |
| 封裝： | SOT-23, 8 PIN |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 315K |
| 代理商： | MAX3362EKA |
M
3.3V, High-Speed, RS-485/RS-422 Transceiver in
SOT Package
12
______________________________________________________________________________________
connected to the line and is powered up the driver
must not cause the differential signal to drop below
200mV. Figures 10, 11, and 12 show the results of the
MAX3362 during power-up for three different V
CC
ramp
rates (0.1V/μs, 1V/μs, and 10V/μs). The photos show
the V
CC
ramp, the single-ended signal on each side of
the 100
termination, as well as the differential signal
across the termination.
Low-Power Shutdown Mode
Low-power shutdown mode is initiated by bringing both
RE
high and DE low. In shutdown, the MAX3362 typi-
cally draws only 1μA supply current.
RE
and DE may be driven simultaneously; the device is
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 device will enter shutdown.
Enable times t
PDZH,
t
PDZL,
t
PRZH
and t
PRZL
in the
Switching Characteristics
table assume the device was
not in a low-power shutdown state. Enable times t
PDSH,
t
PDSL,
t
PRSH,
and t
PRSL
assume the device was shut
down. Drivers and receivers take longer to become
enabled from low-power shutdown mode than from
driver/receiver disable mode.
Applications Information
Propagation Delays
Figures 5 and 6 show the typical propagation delays.
Skew time is simply the difference between the low-to-
high and high-to-low propagation delay. Small
driver/receiver skew times help maintain a symmetrical
mark-space ratio (50% duty cycle). Both the receiver
skew time and driver skew time are under 6ns.
256 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12k
(one-unit load), and a standard driver can drive up to
32 unit loads. The MAX3362 transceiver has a 1/8-unit-
load receiver input impedance (96k
), allowing up to
256 transceivers to be connected in parallel on one
communication line. Any combination of these devices
and/or other RS-485 transceivers with a total of 32 unit
loads or less can be connected to the line.
Driver Output Protection
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.
Typical Applications
The MAX3362 transceiver is designed for bidirectional
data communications on multipoint bus transmission
lines. The
Typical Operating Circuit
shows a typical net-
work applications circuit. To minimize reflections, the
line should be terminated at both ends in its character-
istic impedance, and stub lengths off the main line
should be kept as short as possible.
1
μ
s/div
B
V
CC
10mV/div
3.3V
A
A-B
10mV/div
AC-COUPLED
10mV/div
AC-COUPLED
0
Figure 11. Differential Power-Up Glitch (1V/μs)
200ns/div
B
V
CC
10mV/div
3.3V
A
A-B
50mV/div
AC-COUPLED
50mV/div
AC-COUPLED
0
Figure 12. Differential Power-Up Glitch (10V/μs)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3362EKA#G15 | 制造商:Maxim Integrated Products 功能描述: |
| MAX3362EKA#G16 | 制造商:Maxim Integrated Products 功能描述:LINE TRNSCVR 1TR 1TX 1RX 8PIN SOT-23 - Rail/Tube |
| MAX3362EKA#TG15 | 功能描述:RS-422/RS-485 接口 IC 3.3V High-Speed Transceiver 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 |
| MAX3362EKA#TG16 | 功能描述:RS-422/RS-485 接口 IC 3.3V High-Speed Transceiver 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 |
| MAX3362EKA-T | 功能描述:RS-422/RS-485 接口 IC 3.3V High-Speed Transceiver 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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