Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
Table 9:
Dynamic characteristics type 74HC245
…continued
GND = 0 V; test circuit see
Figure 7.
Symbol
t
PZH
, t
PZL
Parameter
3-state output enable time OE to
An or OE to Bn
Conditions
see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
t
PHZ
, t
PLZ
3-state output disable time OE to
An or OE to Bn
see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
t
THL
, t
TLH
output transition time
see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
T
amb
=
−40 °C
to +125
°C
t
PHL
, t
PLH
propagation delay An to Bn or Bn see
to An
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
t
PZH
, t
PZL
3-state output enable time OE to
An or OE to Bn
see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
t
PHZ
, t
PLZ
3-state output disable time OE to
An or OE to Bn
see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
t
THL
, t
TLH
output transition time
see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
[1]
C
PD
is used to determine the dynamic power dissipation (P
D
in
µW):
P
D
= C
PD
×
V
CC2
×
f
i
×
N +
∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in V;
N = number of inputs switching;
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs.
Min
-
-
-
-
-
-
-
-
-
Typ
-
-
-
-
-
-
-
-
-
Max
190
38
33
190
38
33
75
15
13
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
135
27
23
225
45
38
225
45
38
90
18
15
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
9397 750 14502
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 31 January 2005
11 of 22
PHILIPS [ NXP SEMICONDUCTORS ]
