Nexperia
74LVT640
3.3 V Octal transceiver with direction pin; inverting; 3-state
74LVT640 All information provided in this document is subject to legal disclaimers. © Nexperia B.V. 2017. All rights reserved.
Product data sheet Rev. 3 — 10 April 2017
7 / 15
10.1 Waveforms and test circuit
aaa-026620
Bn, An output
An, Bn input
t
PHL
t
PLH
V
M
V
M
V
I
GND
V
OH
V
OL
V
M
V
M
See Table 8 for measurement points.
V
OL
and V
OH
are typical output voltage levels that occur with the output load.
Figure 5. Input (An, Bn) to output (Bn, An) propagation delays
001aah733
outputs
enabled
outputs
enabled
outputs
disabled
V
M
V
M
V
Y
V
M
V
X
V
I
GND
3.0 V
V
OL
V
OH
GND
output
HIGH-to-OFF
OFF-to-HIGH
output
LOW-to-OFF
OFF-to-LOW
t
PZH
t
PHZ
t
PZL
t
PLZ
OE input
See Table 8 for measurement points.
V
OL
and V
OH
are typical output voltage levels that occur with the output load.
Figure 6. 3-state output enable and disable times
Table 8. Measurement points
Input Output
V
I
V
M
V
M
V
x
V
y
GND to 2.7 V 1.5 V 1.5 V V
OL
+ 0.3 V V
OH
- 0.3 V
