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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 203K |
| 代理商： | MAX3221 |
M
1μA S upply Current, True +3V to +5.5V RS -232
Transc eivers with AutoS hutdown
_______________________________________________________________________________________
9
Power-S upply Dec oupling
In most circumstances a 0.1μF bypass capacitor is
adequate. In applications that are sensitive to power-
supply noise, decouple V
CC
to ground with a capacitor
of the same value as the charge-pump capacitor C1.
Connect bypass capacitors as close to the IC as possible.
T ransmitter Outputs
when Exiting S hutdown
Figure 6 shows two transmitter outputs when exiting shut-
down mode. As they become active, the two transmitter
outputs are shown going to opposite RS-232 levels. Each
transmitter is loaded with 3k
in parallel with 2500pF. The
transmitter outputs display no ringing or undesirable tran-
sients as they come out of shutdown. Note that the trans-
mitters are enabled only when the magnitude of V-
exceeds approximately 3V. Figure 7a shows the
MAX3243’s transmitter output voltage vs. current per
transmitter. Figure 7b is a mouse driver test circuit.
Mouse Driveability (MAX 3243)
The MAX3243 has been specifically designed to power
serial mice while operating from low-voltage power sup-
plies. It has been tested with samples of ten major mouse
models from six manufacturers including the leading
three: Logitech (5 models), Mouse Systems, and
Microsoft. The MAX3243 successfully drove all serial
mice and met their respective current and voltage
requirements. Figure 7a shows the transmitter outputs
under increasing load current. The MAX3243’s switching
regulator ensures the transmitters will supply at least ±5V
during worst-case conditions. The AutoShutdown feature
does not work with a mouse, so
FORCEOFF
and
FORCEON should be connected to V
CC.
High Data Rates
The MAX3221/MAX3223/MAX3243 maintain the RS-232
±5.0V minimum transmitter output voltage even at high
data rates. Figure 8 shows a transmitter loopback test
circuit. Figure 9 shows a loopback test result at
120kbps, and Figure 10 shows the same test at
240kbps. For Figure 9, all three transmitters were driv-
en simultaneously at 120kbps into RS-232 loads in par-
allel with 1000pF. For Figure 10, a single transmitter
was driven at 235kbps, but all three transmitters were
loaded with an RS-232 receiver in parallel with 1000pF.
Interc onnec tion with 3V and 5V Logic
The MAX3221/MAX3223/MAX3243 can directly inter-
face with various 5V logic families, including ACT and
HCT CMOS. See Table 4 for more information on possi-
ble combinations of interconnections.
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
M
LOAD CURRENT PER TRANSMITTER (mA)
T
V
OUT
+
V
CC
= 3.0V
V
OUT
-
V
OUT
+
V
CC
V
OUT
-
T
1
T
2
T
3
Figure 7a. MAX3243 Transmitter Output Voltage vs. Load
Current per Transmitter
5V/div
V
CC
= 3.3V
C1–C4 = 0.1
μ
F
2V/div
T2
50
μ
s/div
T1
Figure 6. Transmitter Outputs when Exiting Shutdown or
Powering Up
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PDF描述 |
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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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