Datasheet

TCA4311A
SCPS226A –JANUARY 2011–REVISED JULY 2012 www.ti.com
Table 1. ORDERING INFORMATION
T
A
PACKAGE
(1) (2)
ORDERABLE PART NUMBER TOP-SIDE MARKING
Tube TCA4311AD PREVIEW
SOIC – D
–40°C to 85°C Tape and reel TCA4311ADR PREVIEW
MSOP – DGK Tape and reel TCA4311ADGKR 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.
TERMINAL FUNCTIONS
SOIC (D) OR MSOP (DGK)
PACKAGE
DESCRIPTION
PIN NUMBER NAME
Active-high chip enable pin. If EN is low, the TCA4311A is in a low current (<1 μA) mode. It also
disables the rise-time accelerators, disables the bus precharge circuitry, drives READY low, isolates
1 EN
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.
2 SCLOUT Serial clock output. Connect this pin to the SCL bus on the card.
3 SCLIN
Serial clock input. Connect this pin to the SCL bus on the backplane.
4 GND Supply ground
Connection flag/rise-time accelerator control. READY is low when either EN is low or the start-up
5 READY 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.
6 SDAIN Serial data input. Connect this pin to the SDA bus on the backplane.
7 SDAOUT 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
8 V
CC
the backplane I
2
C 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 μF close to this pin for best results.
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Product Folder Link(s): TCA4311A