TCA4311A Datasheet, PDF (2/22 Pages) Texas Instruments – HOT SWAPPABLE 2-WIRE BUS BUFFERS

TCA4311A
SCPS226 – JANUARY 2011
www.ti.com
T_A
–40°C to 85°C
Table 1. ORDERING INFORMATION
PACKAGE^{(1) (2)}
ORDERABLE PART NUMBER
SOIC – D
Tube
Tape and reel
TCA4311AD
TCA4311ADR
MSOP – DGK
Tape and reel
TCA4311ADGKR
TOP-SIDE MARKING
PREVIEW
PREVIEW
6KS
(1) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(2) 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.
SOIC (D) OR MSOP (DGK)
PACKAGE
PIN NUMBER
NAME
1
EN
2
SCLOUT
3
SCLIN
4
GND
5
READY
6
SDAIN
7
SDAOUT
8
V_CC
TERMINAL FUNCTIONS
DESCRIPTION
Active-high chip enable pin. If EN is low, the TCA4311A is in a low current (<1 mA) mode. It also
disables the rise-time accelerators, disables the bus precharge circuitry, drives READY low, isolates
SDAIN from SDAOUT and isolates SCLIN from SCLOUT. EN should be high (at V_CC) for normal
operation. Connect EN to V_CC if this feature is not being used.
Serial clock output. Connect this pin to the SCL bus on the card.
Serial clock input. Connect this pin to the SCL bus on the backplane.
Supply ground
Connection flag/rise-time accelerator control. READY is low when either EN is low or the start-up
sequence described in the operation section has not been completed. READY goes high when EN is
high and start-up is complete. Connect a 10-kΩ resistor from this pin to V_CC to provide the pull up.
Serial data input. Connect this pin to the SDA bus on the backplane.
Serial data output. Connect this pin to the SDA bus on the card.
Supply power. Main input power supply from backplane. This is the supply voltage for the devices on
the backplane I²C busses. Connect pullup resistors from SDAIN and SCLIN (and also from SDAOUT
and SCLOUT) to this pin. Place a bypass capacitor of at least 0.01 mF close to this pin for best results.
2
Submit Documentation Feedback
Product Folder Link(s): TCA4311A
Copyright © 2011, Texas Instruments Incorporated