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TRSF3221E_V01

更新时间： 2024-11-19 02:48:35
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德州仪器 - TI 驱动
页数 文件大小 规格书
21页 893K
描述
3-V TO 5.5-V SINGLE-CHANNEL RS-232 1-Mbit/s LINE DRIVER/RECEIVER WITH ±15-kV IEC ESD PROTECTION

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TRSF3221E  
3-V TO 5.5-V SINGLE-CHANNEL RS-232 1-Mbit/s LINE DRIVER/RECEIVER  
WITH ±15-kV IEC ESD PROTECTION  
www.ti.com  
SLLS822–JULY 2007  
FEATURES  
DB OR PW PACKAGE  
•
ESD Protection for RS-232 Pins  
(TOP VIEW)  
–
–
–
±15-kV Human-Body Model (HBM)  
EN  
C1+  
V+  
FORCEOFF  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
±8-kV IEC 61000-4-2 Contact Discharge  
±15-kV IEC 61000-4-2 Air-Gap Discharge  
V
CC  
GND  
•
•
•
•
•
•
Operates With 3-V to 5.5-V VCC Supply  
Operates up to 1 Mbit/s  
C1−  
C2+  
C2−  
V−  
DOUT  
FORCEON  
DIN  
Low Standby Current . . . 1 μA Typ  
External Capacitors . . . 4 × 0.1 μF  
Accepts 5-V Logic Input With 3.3-V Supply  
INVALID  
ROUT  
RIN  
RS-232 Bus-Pin ESD Protection Exceeds  
±15 kV Using HBM  
•
Auto-Powerdown Feature Automatically  
Disables Drivers for Power Savings  
APPLICATIONS  
•
Battery-Powered, Hand-Held, and Portable  
Equipment  
•
•
•
•
PDAs and Palmtop PCs  
Notebooks, Sub-Notebooks, and Laptops  
Digital Cameras  
Mobile Phones and Wireless Devices  
DESCRIPTION/ORDERING INFORMATION  
The TRSF3221E consists of one line driver, one line receiver, and a dual charge-pump circuit with ±15-kV IEC  
ESD protection pin to pin (serial-port connection pins, including GND). The TRSF3221E 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. The TRSF3221E operates  
at data signaling rates up to 1 Mbit/s and a driver output slew rate of 24 V/μs to 150 V/μs.  
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 TRSF3221E does not sense a valid RS-232 signal on the receiver input, the driver output is  
disabled. If FORCEOFF is set low and the enable (EN) input 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. See 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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