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TCA9548A

更新时间： 2024-11-07 12:21:43
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德州仪器 - TI 开关
页数 文件大小 规格书
22页 586K
描述
LOW VOLTAGE 8-CHANNEL I2C SWITCH WITH RESET

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TCA9548A 数据手册

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TCA9548A  
www.ti.com  
SCPS207A –MAY 2012–REVISED JULY 2012  
LOW VOLTAGE 8-CHANNEL I2C SWITCH WITH RESET  
Check for Samples: TCA9548A  
1
FEATURES  
•
•
•
•
1-of-8 Bidirectional Translating Switches  
•
•
Low Standby Current  
I2C Bus and SMBus Compatible  
Operating Power-Supply Voltage Range of  
1.65 V to 5.5 V  
Active-Low Reset Input  
•
•
•
5-V-Tolerant Inputs  
400-kHz Fast I2C Bus  
Address by Three Hardware Address Pins for  
Use of up to Eight Devices  
Channel Selection Via I2C Bus  
Power-Up with All Switch Channels Deselected  
Low rON Switches  
•
•
•
•
Latch-Up Performance Exceeds 100 mA Per  
JESD 78, Class II  
•
ESD Protection Exceeds JESD 22  
–
–
–
2000-V Human-Body Model (A114-A)  
200-V Machine Model (A115-A)  
Allows Voltage-Level Translation Between 2.5-  
V, 3.3-V, and 5-V Buses  
•
•
No Glitch on Power Up  
Supports Hot Insertion  
1000-V Charged-Device Model (C101)  
PW PACKAGE  
(TOP VIEW)  
RGE PACKAGE  
(TOP VIEW)  
VCC  
1
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
A0  
A1  
2
SDA  
SCL  
A2  
3
RESET  
SD0  
SC0  
SD1  
SC1  
SD2  
SC2  
SD3  
SC3  
GND  
24 23 22 21 20 19  
4
1
2
3
4
5
6
18  
17  
16  
15  
14  
13  
SD0  
A2  
5
SC7  
SD7  
SC6  
SD6  
SC5  
SD5  
SC4  
SD4  
SC0  
SD1  
SC1  
SD2  
SC2  
SC7  
SD7  
SC6  
SD6  
SC5  
6
7
8
9
10  
11  
12  
7
8 9 10 11 12  
DESCRIPTION/ORDERING INFORMATION  
The TCA9548A has eight bidirectional translating switches that can be controlled via the I2C bus. The SCL/SDA  
upstream pair fans out to eight downstream pairs, or channels. Any individual SCx/SDx channel or combination  
of channels can be selected, determined by the contents of the programmable control register.  
The system master can reset the TCA9548A in the event of a timeout or other improper operation by asserting a  
low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state  
machine. Asserting RESET causes the same reset/initialization to occur without powering down the part.  
The pass gates of the switches are constructed so that the VCC pin can be used to limit the maximum high  
voltage, which is passed by the TCA9548A. This allows the use of different bus voltages on each pair, so that  
1.8-V or 2.5-V or 3.3-V parts can communicate with 5-V parts, without any additional protection. External pullup  
resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5-V tolerant.  
ORDERING INFORMATION  
TA  
PACKAGE(1) (2)  
ORDERABLE PART NUMBER  
TOP-SIDE MARKING  
QFN – RGE  
Reel of 3000  
TCA9548ARGER  
–40°C to 85°C  
Reel of 2000  
Tube of 60  
TCA9548APWR  
TSSOP – PW  
PW548A  
TCA9548APW  
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI  
website at www.ti.com.  
(2) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at  
www.ti.com/sc/package.  
1
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 © 2012, 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.  
1234567...22

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TCA9548A 替代型号

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