User Manual

74LVC_LVCH245A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 8 — 28 June 2013 8 of 18
NXP Semiconductors
74LVC245A; 74LVCH245A
Octal bus transceiver; 3-state
11. AC waveforms
See Table 8 for measurement points
V
OL
and V
OH
are typical output voltage levels that occur with the output load.
Fig 5. Input (An, Bn) to output (Bn, An) propagation delays and output transition times
mna176
An, Bn input
Bn, An output
t
PLH
t
PHL
GND
V
I
V
M
V
M
V
M
V
M
V
OH
V
OL
See Table 8 for measurement points
V
OL
and V
OH
are typical output voltage levels that occur with the output load.
Fig 6. Enable and disable times
mna367
t
PLZ
t
PHZ
outputs
disabled
outputs
enabled
V
Y
V
X
outputs
enabled
output
LOW-to-OFF
OFF-to-LOW
output
HIGH-to-OFF
OFF-to-HIGH
OE input
V
I
V
OL
V
OH
V
CC
V
M
GND
GND
t
PZL
t
PZH
V
M
V
M
Table 8. Measurement points
Supply voltage V
M
Input
V
CC
V
I
t
r
=t
f
V
X
V
Y
1.2 V 0.5  V
CC
V
CC
 2.5 ns V
OL
+ 0.15 V V
OH
 0.15 V
1.65 V to 1.95 V 0.5  V
CC
V
CC
 2.5 ns V
OL
+ 0.15 V V
OH
 0.15 V
2.3 V to 2.7 V 0.5  V
CC
V
CC
 2.5 ns V
OL
+ 0.15 V V
OH
 0.15 V
2.7V 1.5V 2.7V  2.5 ns V
OL
+ 0.3 V V
OH
 0.3 V
3.0V to 3.6V 1.5V 2.7V  2.5 ns V
OL
+ 0.3 V V
OH
 0.3 V