SN74CB3T3306_16 Datasheet, PDF (10/19 Pages) Texas Instruments – Dual FET Bus Switch

SN74CB3T3306
SCDS119C – JANUARY 2003 – REVISED DECEMBER 2015
8.4 Device Functional Modes
Table 1 lists the functional modes for the SN74CB3T3306.
INPUT
OE
L
H
Table 1. Function Table
INPUT/OUTPUT
A
B
Hi-Z
FUNCTION
A port = B port
Disconnect
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9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
This application is specifically to connect a 5-V bus to a 3.3 V device. Ideally, set V_CC to 3.3 V. It is assumed that
communication in this particular application is one-directional, going from the bus controller to the device.
9.2 Typical Application
1
Bus
2
3
Controller
5
6
7
4
8
0.1 µF
Figure 8. Typical Application Diagram
9.2.1 Design Requirements
This device uses CMOS technology and has balanced output drive. Take care to avoid bus contention because it
can drive currents that would exceed maximum limits.
Because this design is for down-translating voltage, no pull-up resistors are required.
9.2.2 Detailed Design Procedure
1. Recommended Input conditions
– Specified high and low levels. See (V_IH and V_IL) in Recommended Operating Conditions
– Inputs are overvoltage tolerant allowing them to go as high as 7 V at any valid V_CC
2. Recommend output conditions
– Load currents should not exceed 128 mA on each channel
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