74lvc2t45 NXP Semiconductors, 74lvc2t45 Datasheet - Page 25

• Manufacturer Part Number: 74lvc2t45
• Description: Dual Supply Translating Transceiver; 3-state
• Manufacturer: NXP Semiconductors

NXP Semiconductors
74LVC_LVCH2T45_2
Product data sheet
14.4 Enable times
Calculate the enable times for the 74LVC2T45; 74LVCH2T45 using the following formulas:
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.
•
•
•
•
t
t
t
t
PZH
PZL
PZH
PZL
(DIR to A) = t
(DIR to B) = t
(DIR to A) = t
(DIR to B) = t
PHZ
PHZ
PLZ
PLZ
Rev. 02 — 5 February 2009
(DIR to B) + t
(DIR to B) + t
(DIR to A) + t
(DIR to A) + t
74LVC2T45; 74LVCH2T45
PLH
PHL
PLH
PHL
(B to A)
(B to A)
(A to B)
(A to B)
Dual supply translating transceiver; 3-state
© NXP B.V. 2009. All rights reserved.
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