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TRS3238IDB

更新时间： 2024-11-20 05:53:07
品牌 Logo 应用领域
德州仪器 - TI 驱动器
页数 文件大小 规格书
19页 367K
描述
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER WITH ±15-kV ESD (HBM) PROTECTION

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TRS3238IDB 数据手册

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TRS3238  
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER  
WITH ±15-kV ESD (HBM) PROTECTION  
www.ti.com  
SLLS817–JULY 2007  
FEATURES  
DB OR PW PACKAGE  
•
RS-232 Bus-Pin ESD Protection Exceeds  
(TOP VIEW)  
±15 kV Using Human-Body Model (HBM)  
C2+  
GND  
C2−  
C1+  
27 V+  
26  
1
28  
•
Meets or Exceeds the Requirements of  
TIA/EIA-232-F and ITU v.28 Standards  
2
3
V
CC  
•
•
•
•
•
•
•
Operates With 3-V to 5.5-V VCC Supply  
Operates up to 250 kbit/s  
V−  
4
25 C1−  
DOUT1  
DOUT2  
DOUT3  
RIN1  
5
24 DIN1  
Five Drivers and Three Receivers  
Low Standby Current . . . 1 μA Typical  
External Capacitors . . . 4 × 0.1 μF  
Accepts 5-V Logic Input With 3.3-V Supply  
6
23  
22  
21  
20  
19  
18  
17  
16  
15  
DIN2  
7
DIN3  
8
ROUT1  
ROUT2  
DIN4  
9
RIN2  
DOUT4  
RIN3  
10  
11  
12  
13  
14  
Always-Active Noninverting Receiver Output  
(ROUT1B)  
ROUT3  
DIN5  
DOUT5  
FORCEON  
FORCEOFF  
•
Alternative High-Speed Pin-Compatible Device  
(1 Mbit/s)  
ROUT1B  
INVALID  
–
TRSF3238  
APPLICATIONS  
•
•
•
•
•
•
•
•
•
Battery-Powered Systems  
PDAs  
Notebooks  
Subnotebooks  
Laptops  
Palmtop PCs  
Hand-Held Equipment  
Modems  
Printers  
DESCRIPTION/ORDERING INFORMATION  
The TRS3238 consists of five line drivers, three line receivers, and a dual charge-pump circuit with ±15-kV ESD  
(HBM) protection pin to pin (serial-port connection pins, including GND). The device meets the requirements of  
TIA/EIA-232-F and provides the electrical interface between notebook and subnotebook computer applications.  
The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. In  
addition, the device includes an always-active noninverting output (ROUT1B), which allows applications using  
the ring indicator to transmit data while the device is powered down. The TRS3238 operates 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 featured when the serial port and driver inputs are inactive.  
The auto-powerdown plus feature functions when FORCEON is low and FORCEOFF is high. During this mode  
of operation, if the device does not sense valid signal transitions on all receiver and driver inputs for  
approximately 30 s, the built-in charge pump and drivers are powered down, reducing the supply current to  
1 μA. By disconnecting the serial port or placing the peripheral drivers off, auto-powerdown plus occurs if there  
is no activity in the logic levels for the driver inputs. Auto-powerdown plus can be disabled when FORCEON and  
FORCEOFF are high. With auto-powerdown plus enabled, the device activates automatically when a valid signal  
is applied to any receiver or driver input. INVALID is high (valid data) if any 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 all receiver input voltages are 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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