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參數(shù)資料
| 型號(hào)： | MAX3221E |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | Video/Imaging Fixed-Point Digital Signal Processor 548-FCBGA |
| 中文描述： | ±15kV ESD保護(hù)、1µA、3.0V至5.5V、250kbps RS-232收發(fā)器，帶有AutoShutdown |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大?。?/td> | 153K |
| 代理商： | MAX3221E |
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M
±15kV ESD-Protected, 1μA, 3.0V to 5.5V, 250kbps,
RS -232 Transc eivers with AutoS hutdown
6
_______________________________________________________________________________________
Pin Desc ription
-5.5V generated by the charge pump
V-
RS-232 Receiver Inputs
R_IN
TTL/CMOS Receiver Outputs
R_OUT
Output of the Valid Signal Detector.
INVALID
is enabled high if a valid
RS-232 level is present on any receiver input.
INVALID
+5.5V generated by the charge pump
V+
Negative terminal of the voltage doubler Charge-Pump Capacitor
C1-
Positive terminal of inverting Charge-Pump Capacitor
C2+
Negative terminal of inverting Charge-Pump Capacitor
C2-
Positive terminal of the voltage doubler Charge-Pump Capacitor
C1+
Receiver Enable Control. Drive low for normal operation. Drive high to
force the receiver outputs (R_OUT) into a high-impedance state.
EN
FUNCTION
TTL/CMOS Transmitter Inputs
T_IN
Drive high to override automatic circuitry keeping transmitters and
charge pump on (
FORCEOFF
must be high) (Table 1).
FORCEON
_______________Detailed Desc ription
Dual Charge-Pump V oltage Converter
The MAX3221E/MAX3223E/MAX3243E’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), over the
+3.0V to +5.5V V
CC
range. The charge pumps operate
in 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 250kbps data rate with worst-case loads
of 3k
in parallel with 1000pF, providing compatibility
with PC-to-PC communication software such as
LapLink. Transmitters can be paralleled to drive mul-
tiple receivers. The MAX3243E has been specifically
designed to drive serial mice. Figure 1 shows a com-
plete system connection.
When
FORCEOFF
is driven to ground, or the
AutoShutdown circuitry senses invalid voltage levels on
all receiver inputs, the transmitters are disabled and the
outputs are forced into a high-impedance state. When
powered off or shut down, the output can be driven up
to ±12V. The transmitter inputs do not have pull-up
resistors.
7
8
9
10
3
4
5
6
2
1
11
12
NAME
MAX3221E
RS-232 Transmitter Outputs
T_OUT
13
TTL/CMOS Noninverting Complementary Receiver Output. Always
active.
R2OUTB
—
7
9, 16
10, 15
11
3
4
5
6
2
1
12, 13
14
3
4–8
15–19
21
27
24
1
2
28
—
12, 13, 14
23
MAX3223E
8, 17
MAX3243E
9, 10, 11
—
20
PIN
14
18
25
GND
Ground
15
19
26
V
CC
+3.0V to +5.5V Supply Voltage
16
20
22
FORCEOFF
Force-Off Input, active low. Drive low to shut down transmitters,
receivers (MAX3243E, except R2OUTB), and on-board charge pump.
This overrides all automatic circuitry and FORCEON (Table 1).
LapLink is a trademark of Traveling Software.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3221EAE | 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: |
| MAX3221EAE+ | 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: |
| MAX3221EAE+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: |
| MAX3221EAE-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: |
| MAX3221ECAE | 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: |
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