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| SN74AVC2T872_1 Datasheet, PDF (15/18 Pages) Texas Instruments – VOLTAGE-LEVEL SHIFTER FOR IC-USB INTERFACE | |||
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SN74AVC2T872
www.ti.com........................................................................................................................................................................................... SCES710 â NOVEMBER 2008
APPLICATION INFORMATION
Enable Times
Calculate the enable times for the SN74AVC2T872 using the following formulas shown in Table 1.
Table 1. Enable Times
tPZH (DIR to A) = tPLZ (DIR to B) + tPLH (B to A)
tPZL (DIR to A) = tPHZ (DIR to B) + tPHL (B to A)
tPZH (DIR to B) = tPLZ (DIR to A) + tPLH (A to B)
tPZL (DIR to B) = tPHZ (DIR to A) + tPHL (A to B)
In a bidirectional application, these enable times provide the maximum delay from the time the DIR bit is
switched until an output is expected. For example, if the SN74AVC2T872 initially is transmitting from A to B, then
the DIR bit is switched; the B port of the device must be disabled before presenting it with an input. After the B
port has been disabled, an input signal applied to it appears on the corresponding A port after the specified
propagation delay.
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): SN74AVC2T872
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