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參數(shù)資料
| 型號(hào)： | MAX3222CPN |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 17/17頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 120KBPS LP 18-DIP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 20 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 2/2 |
| 規(guī)程： | RS232 |
| 電源電壓： | 3 V ~ 5.5 V |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 18-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 18-PDIP |
| 包裝： | 管件 |
| 其它名稱： | Q843762 |
MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1F External Capacitors
_______________________________________________________________________________________
9
Power-Supply Decoupling
In most circumstances, a 0.1F bypass capacitor is
adequate. In applications that are sensitive to power-
supply noise, decouple VCC to ground with a capacitor
of the same value as charge-pump capacitor C1. Connect
bypass capacitors as close to the IC as possible.
Operation Down to 2.7V
Transmitter outputs will meet EIA/TIA-562 levels of
±3.7V with supply voltages as low as 2.7V.
Transmitter Outputs when
Exiting Shutdown
Figure 3 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232 lev-
els (one transmitter input is high, the other is low).
Each transmitter is loaded with 3k
in parallel with
2500pF. The transmitter outputs display no ringing or
undesirable transients as they come out of shutdown.
Note that the transmitters are enabled only when the
magnitude of V- exceeds approximately 3V.
Mouse Driveability
The MAX3241 has been specifically designed to power
serial mice while operating from low-voltage power sup-
plies. It has been tested with leading mouse brands from
manufacturers such as Microsoft and Logitech. The
MAX3241 successfully drove all serial mice tested and
met their respective current and voltage requirements.
Figure 4a shows the transmitter output voltages under
increasing load current at 3.0V. Figure 4b shows a typical
mouse connection using the MAX3241.
Table 1. MAX3222/MAX3237/MAX3241
Shutdown and Enable Control Truth Table
Table 2. Required Minimum Capacitor Values
5V/div
VCC = 3.3V
C1–C4 = 0.1
F
2V/div
T2
50
s/div
T1
Figure 3. Transmitter Outputs when Exiting Shutdown or
Powering Up
VCC
(V)
C1
(μF)
4.5 to 5.5
0.047
3.0 to 5.5
0.1
C2, C3, C4
(μF)
MAX3222/MAX3232/MAX3241
0.33
0.47
1
Active
0
1
Active
1
S
SH
HD
DN
N
High-Z
1
0
High-Z
0
T_OUT
E
EN
N
High-Z
Active
High-Z
Active
R_OUT
R_OUTB
(MAX3237/
MAX3241)
Active
3.0 to 3.6
0.22
3.15 to 3.6
0.1
MAX3237
0.22
0.1
4.5 to 5.5
0.047
3.0 to 5.5
0.22
0.33
1.0
3.0 to 3.6
0.1
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| MAX3222CPW | 制造商:Texas Instruments 功能描述:Transceiver IC 制造商:Texas Instruments 功能描述:IC, RS-232 TRANSCEIVER, 5.5V, TSSOP-20 |
| MAX3222CPWE4 | 功能描述:RS-232接口集成電路 3-5.5V Multichannel 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: |
| MAX3222CPWG4 | 功能描述:RS-232接口集成電路 3-5.5V Sgl-Ch RS- 232 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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