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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)： | 5/16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
_______________________________________________________________________________________
5
______________________________________________________________Pin Desc ription
Noninverting Receiver Output—active in shutdown
R2OUTB
Output of the valid signal detector. Indicates if a valid RS-232 level is pres-
ent on receiver inputs logic “1”.
INVALID
Drive low to shut down transmitters and on-board power supply. This over-
rides all automatic circuitry and FORCEON (Table 1).
FORCEOFF
Drive high to override automatic circuitry keeping transmitters on
(
FORCEOFF
must be high) (Table 1).
FORCEON
Negative terminal of the voltage doubler charge-pump capacitor
C1-
RS-232 Receiver Inputs
R_IN
RS-232 Transmitter Outputs
T_OUT
TTL/CMOS Transmitter Inputs
T_IN
TTL/CMOS Receiver Outputs
R_OUT
-5.5V generated by the charge pump
V-
Negative terminal of inverting charge-pump capacitor
C2-
Positive terminal of inverting charge-pump capacitor
C2+
Receiver Enable Control. Drive low for normal operation. Drive high to force
the receiver outputs into a high-Z state.
EN
FUNCTION
Ground
GND
+3.0V to +5.5V Supply Voltage
V
CC
LapLink is a trademark of Traveling Software.
_______________Detailed Desc ription
Dual Charge-Pump V oltage Converter
The MAX3221/MAX3223/MAX3243’s internal power
supply consists of a regulated dual charge pump that
provides output voltages of +5.5V (doubling charge
pump) and -5.5V (inverting charge pump), regardless
of the input voltage (V
CC
) over the +3.0V to +5.5V
range. The charge pumps operate in a discontinuous
mode: if the output voltages are less than 5.5V, the
charge pumps are enabled; if the output voltages
exceed 5.5V, the charge pumps are disabled. Each
charge pump requires a flying capacitor (C1, C2) and
a reservoir capacitor (C3, C4) to generate the V+ and
V- supplies.
RS -232 T ransmitters
The transmitters are inverting level translators that con-
vert CMOS-logic levels to 5.0V EIA/TIA-232 levels. They
guarantee a 120kbps data rate with worst-case loads of
3k
in parallel with 1000pF, providing compatibility with
PC-to-PC communication software (such as Laplink).
Typically, the MAX3221/MAX3223/MAX3243 can oper-
ate at data rates of 235kbps. Transmitters can be paral-
leled to drive multiple receivers or mice (MAX3243).
Figure 1 shows a complete system connection.
When
FORCEOFF
is driven to ground, or the Auto-
Shutdown circuitry senses invalid voltage levels at all
receiver inputs, the transmitters are disabled and the
outputs are forced into a high-impedance state.
—
10
16
12
4
8
13
11
9
7
6
5
1
14
15
NAME
MAX3221
+5.5V generated by the charge pump
V+
3
Positive terminal of the voltage doubler charge-pump capacitor
C1+
2
—
11
20
14
4
9, 16
8, 17
12, 13
10, 15
7
6
5
1
18
19
20
21
22
23
24
4–8
9, 10, 11
12, 13, 14
15–19
3
2
1
—
25
26
MAX3223
3
MAX3243
27
2
28
PIN
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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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