74LVC2T45GD PHILIPS [NXP Semiconductors], 74LVC2T45GD Datasheet - Page 25

• Manufacturer Part Number: 74LVC2T45GD
• Description: Dual supply translating transceiver; 3-state
• Manufacturer: PHILIPS [NXP Semiconductors]

NXP Semiconductors
74LVC_LVCH2T45
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
All information provided in this document is subject to legal disclaimers.
PHZ
PHZ
PLZ
PLZ
Rev. 4 — 20 August 2010
(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. 2010. All rights reserved.
25 of 36