Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
12. Waveforms
V
I
An, Bn input
GND
t
PHL
V
OH
Bn, An output
V
OL
t
THL
V
M
VM
10 %
t
TLH
001aac433
V
M
V
M
t
PLH
90 %
Measurement points are given in
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
t
r
V
I
OE input
GND
V
CC
10 %
t
PLZ
output
LOW-to-OFF
OFF-to-LOW
V
OL
t
PHZ
output
HIGH-to-OFF
OFF-to-HIGH
GND
outputs
enabled
outputs
disabled
V
OH
90 %
90 %
V
M
t
f
t
PZL
V
M
10 %
t
PZH
V
M
outputs
enabled
001aac479
Measurement points are given in
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:
Type
74HC245
74HCT245
Measurement points
Input
V
M
0.5V
CC
1.3 V
Output
V
M
0.5V
CC
1.3 V
9397 750 14502
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 31 January 2005
13 of 22
PHILIPS [ NXP SEMICONDUCTORS ]
