74HC245; 74HCT245
Philips Semiconductors
Octal bus tranceiver; 3-state
12. Waveforms
V
I
V
V
M
An, Bn input
GND
M
t
t
PHL
PLH
V
OH
90 %
V
V
Bn, An output
M
M
10 %
V
OL
t
t
TLH
THL
001aac433
Measurement points are given in Table 11.
VOL and VOH 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
t
r
f
V
I
90 %
OE input
output
V
M
10 %
GND
t
t
PZL
PLZ
V
CC
LOW-to-OFF
OFF-to-LOW
V
M
10 %
V
OL
t
t
PHZ
PZH
V
OH
90 %
output
HIGH-to-OFF
OFF-to-HIGH
V
M
GND
outputs
enabled
outputs
enabled
outputs
disabled
001aac479
Measurement points are given in Table 11.
VOL and VOH 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
VM
Output
VM
74HC245
0.5VCC
1.3 V
0.5VCC
1.3 V
74HCT245
9397 750 14502
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 31 January 2005
13 of 22
NXP [ NXP ]
