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TRS3221ECPWG4 PDF预览

TRS3221ECPWG4

更新时间： 2024-11-21 03:58:31
品牌 Logo 应用领域
德州仪器 - TI 驱动器
页数 文件大小 规格书
16页 345K
描述
3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER WITH 【15-kV IEC ESD PROTECTION

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TRS3221E  
3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER  
WITH ±15-kV IEC ESD PROTECTION  
www.ti.com  
SLLS792–JUNE 2007  
FEATURES  
APPLICATIONS  
•
Battery-Powered, Hand-Held, and Portable  
Equipment  
•
ESD Protection for RS-232 Pins  
–
–
–
±15-kV Human-Body Model (HBM)  
•
•
•
•
PDAs and Palmtop PCs  
Notebooks, Subnotebooks, and Laptops  
Digital Cameras  
±8 kV (IEC 61000-4-2, Contact Discharge)  
±15 kV (IEC 61000-4-2, Air-Gap Discharge)  
•
Meets or Exceeds the Requirements of  
TIA/EIA-232-F and ITU v.28 Standards  
Mobile Phones and Wireless Devices  
•
•
•
•
•
•
•
Operates With 3-V to 5.5-V VCC Supply  
Operates up to 250 kbit/s  
DB OR PW PACKAGE  
(TOP VIEW)  
One Driver and One Receiver  
EN  
C1+  
V+  
FORCEOFF  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
Low Standby Current . . . 1 μA Typical  
External Capacitors . . . 4 × 0.1 μF  
Accepts 5-V Logic Input With 3.3-V Supply  
V
CC  
GND  
C1−  
C2+  
C2−  
V−  
DOUT  
FORCEON  
DIN  
Alternative High-Speed Pin-Compatible Device  
(1 Mbit/s)  
INVALID  
ROUT  
–
TRSF3221E  
RIN  
•
Auto-Powerdown Feature Automatically  
Disables Drivers for Power Savings  
DESCRIPTION/ORDERING INFORMATION  
The TRS3221E is a single driver, single receiver RS-232 solution operating from a single VCC supply. The  
RS-232 pins provide IEC G1000-4-2 ESD protection. The device meets the requirements of TIA/EIA-232-F and  
provides the electrical interface between an asynchronous communication controller and the serial-port  
connector. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V  
supply. These devices operate at data signaling rates up to 250 kbit/s and a maximum of 30-V/μs driver output  
slew rate.  
Flexible control options for power management are available when the serial port is inactive. The  
auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of  
operation, if the device does not sense a valid RS-232 signal on the receiver input, the driver output is disabled.  
If FORCEOFF is set low and EN is high, both the driver and receiver are shut off, and the supply current is  
reduced to 1 μA. Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown  
condition to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high.  
With auto-powerdown enabled, the device is activated automatically when a valid signal is applied to the  
receiver input. The INVALID output notifies the user if an RS-232 signal is present at the receiver input. INVALID  
is high (valid data) if the receiver input voltage is greater than 2.7 V or less than –2.7 V, or has been between  
–0.3 V and 0.3 V for less than 30 μs. INVALID is low (invalid data) if the receiver input voltage is between –0.3 V  
and 0.3 V for more than 30 μs. Refer to Figure 5 for receiver input levels.  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2007, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
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