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SN65C3221_15

更新时间： 2024-01-23 22:14:54
品牌 Logo 应用领域
德州仪器 - TI 驱动
页数 文件大小 规格书
16页 289K
描述
3-V TO 5.5-V SINGLE-CHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER

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SN65C3221_15 数据手册

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SLLS351E − APRIL 2002 − REVISED OCTOBER 2004  
DB OR PW PACKAGE  
(TOP VIEW)  
D
Operate With 3-V to 5.5-V V  
Operate Up To 1 Mbit/s  
Supply  
CC  
D
D
D
D
D
Low Standby Current . . . 1 µA Typ  
External Capacitors . . . 4 × 0.1 µF  
EN  
C1+  
V+  
FORCEOFF  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
V
CC  
GND  
Accepts 5-V Logic Input With 3.3-V Supply  
C1−  
C2+  
C2−  
V−  
DOUT  
FORCEON  
DIN  
RS-232 Bus-Pin ESD Protection Exceeds  
15 kV Using Human-Body Model (HBM)  
D
D
Auto-Powerdown Feature Automatically  
Disables Drivers for Power Savings  
INVALID  
ROUT  
RIN  
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 SN65C3221 and SN75C3221 consist of one line driver, one line receiver, and a dual charge-pump circuit  
with 15-kV ESD protection pin to pin (serial-port connection pins, including GND). These devices provide 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 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 devices do 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.  
ORDERING INFORMATION  
ORDERABLE  
PART NUMBER  
TOP-SIDE  
MARKING  
†
T
A
PACKAGE  
SSOP (DB)  
Reel of 2000  
Tube of 90  
SN75C3221DBR  
SN75C3221PW  
SN75C3221PWR  
SN65C3221DBR  
SN65C3221PW  
SN65C3221PWR  
CA3221  
−0°C to 70°C  
−40°C to 85°C  
TSSOP (PW)  
SSOP (DB)  
CA3221  
CB3221  
Reel of 2000  
Reel of 2000  
Tube of 90  
TSSOP (PW)  
CB3221  
Reel of 2000  
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are  
available at www.ti.com/sc/package.  
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.  
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Copyright 2004, Texas Instruments Incorporated  
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1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...16

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