M74HCT540 STMICROELECTRONICS [STMicroelectronics], M74HCT540 Datasheet - Page 6

• Manufacturer Part Number: M74HCT540
• Description: OCTAL BUS BUFFER WITH 3 STATE OUTPUTS HCT540: INVERTED - HCT541 NON INVERTED
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M54/M74HCT540/541
AC ELECTRICAL CHARACTERISTICS (C
(*) C
(Refer to Test Circuit). Average operting current can be obtained by the following equation. I
TEST CIRCUIT I
6/12
Symbol
C
t
t
t
t
t
t
t
t
PD
t
t
C
TLH
THL
PLH
PHL
PLH
PHL
PZH
PHZ
PZL
PLZ
PD
IN
(*)
is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load.
Output Transition
Time
Propagation
Delay Time
(for HCT540)
Propagation
Delay Time
(for HCT541)
Output Enable
Time
Output Disable
Time
Input Capacitance
Power Dissipation
Capacitance
Parameter
HCT540
CC
(Opr.)
V
(V)
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
CC
Test Conditions
(pF)
150
150
150
C
50
50
50
50
50
L
R
R
R
L
L
L
= 1K
= 1K
= 1K
L
= 50 pF, Input t
Min.
54HC and 74HC
T
A
Typ.
= 25
12
16
14
18
18
22
19
34
6
5
o
C
Max.
12
20
25
23
28
30
34
27
10
CC
r
(opr) = C
= t
Value
f
-40 to 85
Min.
= 6 ns)
PD
74HC
V
CC
Max.
15
25
31
29
35
38
43
34
10
o
f
C
IN
+ I
-55 to 125
CC
Min.
/8 (per gate)
54HC
Max.
18
30
38
35
42
45
51
41
10
o
C
Unit
pF
pF
ns
ns
ns
ns
ns
ns
ns
ns