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参数资料
| 型号： | MAX3221EETE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/19页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 250KBPS SD 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
±15kV ESD-Protected, 1A, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
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-.
Power-Supply Decoupling
In most circumstances, a 0.1F VCC bypass capacitor is
adequate. In applications that are sensitive to power-
supply noise, use a capacitor of the same value as the
charge-pump capacitor C1. Connect bypass capacitors
as close to the IC as possible.
Transmitter Outputs
when Exiting Shutdown
Figure 8 shows two transmitter outputs when exiting
shut down mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232 lev-
els (one transmitter output is high, the other is low).
Each transmitter is loaded with 3k
in parallel with
1000pF. The transmitter outputs display no ringing or
undesirable transients as they come out of shutdown,
and are enabled only when the magnitude of V-
exceeds approximately -3V.
High Data Rates
The MAX3221E/MAX3223E/MAX3243E maintain the RS-
232 ±5.0V minimum transmitter output voltage even at
high data rates. Figure 9 shows a transmitter loopback
test circuit. Figure 10 shows a loopback test result at
120kbps, and Figure 11 shows the same test at 250kbps.
For Figure 10, all three transmitters were driven simulta-
neously at 120kbps into RS-232 loads in parallel with
1000pF. For Figure 11, a single transmitter was driven at
250kbps, and all three transmitters were loaded with an
RS-232 receiver in parallel with 1000pF.
Mouse Driveability (MAX3243E)
The MAX3243E has been specifically designed to power
serial mice while operating from low-voltage power sup-
plies. It has been tested with leading mouse brands such
as Logitech and Microsoft. When tested, the MAX3243E
successfully drove all serial mice and met their respective
current and voltage requirements. The MAX3243E’s regu-
lated dual charge pump ensures the transmitters will sup-
ply at least ±5V during worst-case conditions. Figure 12a
shows the transmitter outputs under increasing load cur-
rent. The AutoShutdown feature does not work with a
mouse, so FORCEOFF and FORCEON should be con-
nected to VCC. Figure 12b (on the following page) shows
a mouse driver test circuit. To achieve mouse driveability
with 1A supply current when the port is inactive, use
parts with the AutoShutdown Plus feature (such as the
MAX3244E and MAX3245E).
0.33
0.047
4.5 to 5.5
0.1
3.15 to 3.6
0.22
3.0 to 3.6
C2, C3, C4
(F)
C1, CBYPASS
(F)
VCC
(V)
Table 3. Required Capacitor Values
1
0.22
3.0 to 5.5
40
s/div
T2OUT
FORCEON =
FORCEOFF
T1OUT
5V/div
2V/div
VCC = 3.3V
C1–C4 = 0.1
F
Figure 8. Transmitter Outputs Exiting Shutdown or Powering Up
AutoShutdown Plus is a trademark of Maxim Integrated Products, Inc.
12
Maxim Integrated
MAX3221E/MAX3223E/MAX3243E
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3221EEUE | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3221EEUE+ | 功能描述:RS-232接口集成电路 1uA 3-5.5V Tcvr w/AutoShutdown RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3221EEUE+T | 功能描述:RS-232接口集成电路 1uA 3-5.5V Tcvr w/AutoShutdown RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3221EEUE-T | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3221EIDB | 功能描述:RS-232接口集成电路 RS-232 Line Driver/Receiver RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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