Datasheet

9397 750 14502 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 31 January 2005 13 of 22
Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
12. Waveforms
Measurement points are given in Table 11.
V
OL
and V
OH
are typical voltage output drop that occur with the output load.
Fig 5. Input (An, Bn) to output (Bn, An) propagation delays and output transition times
Measurement points are given in Table 11.
V
OL
and V
OH
are typical voltage output drop that occur with the output load.
Fig 6. 3-state output enable and disable times
Table 11: Measurement points
Type Input Output
V
M
V
M
74HC245 0.5V
CC
0.5V
CC
74HCT245 1.3 V 1.3 V
001aac433
t
PLH
t
PHL
V
M
V
M
90 %
10 %
V
M
V
M
Bn, An output
An, Bn input
V
I
GND
V
OH
V
OL
t
TLH
t
THL
001aac479
t
PLZ
t
PHZ
outputs
disabled
outputs
enabled
90 %
10 %
outputs
enabled
OE input
V
I
V
CC
V
OL
V
OH
GND
GND
V
M
t
PZL
t
PZH
V
M
V
M
output
LOW-to-OFF
OFF-to-LOW
output
HIGH-to-OFF
OFF-to-HIGH
t
r
t
f
90 %
10 %