參數(shù)資料
型號： M54HCT640
廠商： 意法半導(dǎo)體
英文描述： OCTAL BUS TRANSCEIVER3-STATE: HCT245 NON INVERTING HCT640 INVERTING, HCT643 INVERTING/NON INVERTING
中文描述： 八路總線TRANSCEIVER3態(tài)：HCT245非反相HCT640反轉(zhuǎn)，HCT643反向/非反相
文件頁數(shù)： 5/11頁
文件大小： 264K
代理商： M54HCT640
AC ELECTRICAL CHARACTERISTICS
(C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Symbol
Parameter
Test Conditions
Value
-40 to 85
o
C
74HC
Min.
Unit
V
CC
(V)
C
L
(pF)
T
A
= 25
o
C
54HC and 74HC
Min.
Typ.
-55 to 125
o
C
54HC
Min.
Max.
12
Max.
15
Max.
18
t
TLH
t
THL
t
PLH
t
PHL
Output Transition
Time
Propagation
Delay Time
4.5
50
7
ns
4.5
4.5
4.5
4.5
4.5
50
150
50
150
50
13
18
19
24
17
22
30
30
38
30
28
38
38
48
38
33
45
45
57
45
ns
ns
ns
ns
t
PZL
t
PZH
Output Enable
Time
R
L
= 1K
R
L
= 1K
R
L
= 1K
t
PLZ
t
PHZ
C
IN
C
I/OUT
Output Disable
Time
Input Capacitance
Output
Capacitance
Power Dissipation
Capacitance
ns
DIR, G
An, Bn
5
10
10
10
pF
13
pF
C
PD
(*)
HCT245
HCT640/643
41
39
pF
(*) C
PD
isdefined asthe value ofthe IC’sinternal equivalent capactance which is calculated from the operating current consumption without load.
(Refer to Test Circuit).Average operting current can be obtained by thefollowingequation. I
CC
(opr) = C
PD
V
CC
f
IN
+ I
CC
/8(per circuit)
SWITCHING CHARACTERISTICS TEST WAVEFORM
M54/M74HCT245/640/643
5/11
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