參數(shù)資料
型號： 74HC245
廠商： NXP Semiconductors N.V.
英文描述： Octal bus transceiver; 3-state
中文描述： 8個三態(tài)總線收發(fā)器, 3態(tài)
文件頁數(shù)： 12/22頁
文件大?。?/td> 130K
代理商： 74HC245
9397 750 14502
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 31 January 2005
12 of 22
Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
[1]
C
PD
is used to determine the dynamic power dissipation (P
D
in
μ
W):
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.
Table 10:
GND = 0 V; test circuit see
Figure 7
.
Symbol
Parameter
T
amb
= 25
°
C
t
PHL
, t
PLH
propagation delay An to Bn or Bn
to An
Dynamic characteristics type 74HCT245
Conditions
Min
Typ
Max
Unit
see
Figure 5
V
CC
= 4.5 V
V
CC
= 5.0 V; C
L
= 15 pF
V
CC
= 4.5 V; see
Figure 6
-
-
-
12
10
16
22
-
30
ns
ns
ns
t
PZH
, t
PZL
3-state output enable time OE to
An or OE to Bn
3-state output disable time OE to
An or OE to Bn
output transition time
power dissipation capacitance
per transceiver
T
amb
=
40
°
C to +85
°
C
t
PHL
, t
PLH
propagation delay An to Bn or Bn
to An
t
PZH
, t
PZL
3-state output enable time OE to
An or OE to Bn
t
PHZ
, t
PLZ
3-state output disable time OE to
An or OE to Bn
t
THL
, t
TLH
output transition time
T
amb
=
40
°
C to +125
°
C
t
PHL
, t
PLH
propagation delay An to Bn or Bn
to An
t
PZH
, t
PZL
3-state output enable time OE to
An or OE to Bn
t
PHZ
, t
PLZ
3-state output disable time OE to
An or OE to Bn
t
THL
, t
TLH
output transition time
t
PHZ
, t
PLZ
V
CC
= 4.5 V; see
Figure 6
-
16
30
ns
t
THL
, t
TLH
C
PD
V
CC
= 4.5 V; see
Figure 5
V
I
= GND to V
CC
1.5 V
-
5
30
12
-
ns
pF
[1]
-
V
CC
= 4.5 V; see
Figure 5
-
-
28
ns
V
CC
= 4.5 V; see
Figure 6
-
-
38
ns
V
CC
= 4.5 V; see
Figure 6
-
-
38
ns
V
CC
= 4.5 V; see
Figure 5
-
-
15
ns
V
CC
= 4.5 V; see
Figure 5
-
-
33
ns
V
CC
= 4.5 V; see
Figure 6
-
-
45
ns
V
CC
= 4.5 V; see
Figure 6
-
-
45
ns
V
CC
= 4.5 V; see
Figure 5
-
-
18
ns
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