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參數(shù)資料
| 型號(hào)： | MAX3221 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 1μA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown(3V~5.5V,自動(dòng)關(guān)閉方式接收器有效,120kbps，RS-232收發(fā)器) |
| 中文描述： | 1µA電源電流、+3V至+5.5V、真RS-232收發(fā)器，帶有AutoShutdown |
| 文件頁(yè)數(shù)： | 8/16頁(yè) |
| 文件大?。?/td> | 203K |
| 代理商： | MAX3221 |
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M
1μA S upply Current, True +3V to +5.5V RS -232
Transc eivers with AutoS hutdown
8
_______________________________________________________________________________________
other system to realize that the MAX3221/MAX3223/
MAX3243 is awake. If the other system outputs valid
RS-232 signals within that time, the RS-232 ports on
both systems remain enabled.
When shut down, the device’s charge pumps are turned
off, V+ decays to V
CC
, V- decays to ground, and the
transmitter outputs are disabled (high impedance). The
time required to exit shutdown is typically 100μs (Figure
5b).
Software-Controlled Shutdown
If direct software control is desired,
INVALID
can be
used to indicate DTR or Ring Indicator signal. Tie
FORCEOFF
and FORCEON together to bypass Auto-
Shutdown so the line acts like a
SHDN
input.
___________Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for prop-
er operation; either polarized or nonpolarized capacitors
may be used. The charge pump requires 0.1μF capaci-
tors for 3.3V operation. For other supply voltages, refer to
Table 3 for required capacitor values. Do not use values
smaller than those listed in Table 3. Increasing the capac-
itor values (e.g., by a factor of 2) reduces ripple on the
transmitter outputs and slightly reduces power consump-
tion. C2, C3, and C4 can be increased without changing
C1’s value.
However, do not increase C1 without also
increasing the values of C2, C3, and C4 to maintain
the proper ratios (C1 to the other capacitors).
When using the minimum required capacitor values,
make sure the capacitor value does not degrade exces-
sively with temperature. If in doubt, use capacitors with a
larger nominal value. The capacitor’s equivalent series
resistance (ESR) usually rises at low temperatures and
influences the amount of ripple on V+ and V-.
Table 2. AutoShutdown Logic
RS-232 SIGNAL
PRESENT AT
RECEIVER INPUT
FORCEOFF
INPUT
FORCEON
INPUT
INVALID
OUTPUT
TRANSCEIVER STATUS
Yes
H
X
H
Normal Operation
No
H
H
L
Normal Operation (Forced On)
No
H
L
L
Shutdown (AutoShutdown)
Yes
L
X
H
Shutdown (Forced Off)
No
L
X
L
Shutdown (Forced Off)
V-
V
CC
0
V+
0
V
CC
t
INVL
t
WU
INVALID
REGION
RECEIVER
INPUT
VOLTAGE
(V)
INVALID
OUTPUT
(V)
t
INVH
TRANSMITTERS ENABLED, INVALID HIGH
R
AUTOSHUTDOWN, TRANSMITTERS DISABLED,
1
μ
A SUPPLY CURRENT, INVALID LOW
TRANSMITTERS ENABLED, INVALID HIGH
-2.7V
-0.3V
+2.7V
+0.3V
0V
INDETERMINATE
INDETERMINATE
(b)
(a)
Figure 5. AutoShutdown Trip Levels
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3221CAE | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3221CAE+ | 功能描述:RS-232接口集成電路 1uA 3-5.5V Tcvr w/AutoShutdown RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3221CAE+T | 功能描述:RS-232接口集成電路 1uA 3-5.5V Tcvr w/AutoShutdown RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3221CAE-T | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3221CDB | 功能描述:RS-232接口集成電路 3-5.5V Single-Ch Line Drvr/Rcvr RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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