74HC_HCT245_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 1 — 22 July 2013 11 of 20
NXP Semiconductors
74HC245-Q100; 74HCT245-Q100
Octal bus tranceiver; 3-state
[1] t
pd
is the same as t
PLH
and t
PHL
.
[2] t
en
is the same as t
PZH
and t
PZL
.
[3] t
dis
is the same as t
PLZ
and t
PHZ
.
[4] t
t
is the same as t
THL
and t
TLH
.
[5] C
PD
is used to determine the dynamic power dissipation (P
D
in W):
P
D
=C
PD
V
CC
2
f
i
N+ (C
L
V
CC
2
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
CC
2
f
o
) = sum of outputs.
Table 9. Dynamic characteristics type 74HCT245-Q100
GND = 0 V; for test circuit, see Figure 7.
Symbol Parameter Conditions Min Typ Max Unit
T
amb
= 25 C
t
pd
propagation delay An to Bn or Bn to An;
see Figure 5
[1]
V
CC
= 4.5 V - 12 22 ns
V
CC
= 5.0 V; C
L
=15pF - 10 - ns
t
en
enable time OE to An or OE to Bn;
V
CC
= 4.5 V; see Figure 6
[2]
- 1630ns
t
dis
disable time OE to An or OE to Bn;
V
CC
= 4.5 V; see Figure 6
[3]
- 1630ns
t
t
transition time An, Bn; V
CC
= 4.5 V;
see Figure 5
[4]
- 5 12 ns
C
PD
power dissipation capacitance V
I
= GND to V
CC
1.5 V
[5]
-30-pF
T
amb
= 40 C to +85 C
t
pd
propagation delay V
CC
= 4.5 V; see Figure 5
[1]
--28ns
t
en
enable time OE to An or OE to Bn;
V
CC
= 4.5 V; see Figure 6
[2]
--38ns
t
dis
disable time OE to An or OE to Bn;
V
CC
= 4.5 V; see Figure 6
[3]
--38ns
t
t
transition time An, Bn; V
CC
= 4.5 V;
see Figure 5
[4]
--15ns
T
amb
= 40 C to +125 C
t
pd
propagation delay V
CC
= 4.5 V; see Figure 5
[1]
--33ns
t
en
enable time OE to An or OE to Bn;
V
CC
= 4.5 V; see Figure 6
[2]
--45ns
t
dis
disable time OE to An or OE to Bn;
V
CC
= 4.5 V; see Figure 6
[3]
--45ns
t
t
transition time An, Bn; V
CC
= 4.5 V;
see Figure 5
[4]
--18ns
