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74LVC2T45; 74LVCH2T45

Dual supply translating transceiver; 3-state

13.4. Enable times

Calculate the enable times for the 74LVC2T45; 74LVCH2T45 using the following formulas:

• 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 74LVC2T45; 74LVCH2T45 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.

74LVC_LVCH2T45

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Product data sheet

Rev. 12 — 1 March 2023

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