M74HC240 Datasheet, PDF (4/10 Pages) STMicroelectronics – OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (INVERTED)

M74HC240
AC ELECTRICAL CHARACTERISTICS (C_L = 50 pF, Input t_r = t_f = 6ns)
Test Condition
Value
Symbol
Parameter
t_TLH t_THL Output Transition
Time
t_PLH t_PHL Propagation Delay
Time
t_PZL t_PZH High Impedance
Output Enable
Time
t_PLZ t_PHZ High Impedance
Output Disable
Time
V_CC C_L
(V) (pF)
2.0
4.5 50
6.0
2.0
4.5 50
6.0
2.0
4.5 150
6.0
2.0
4.5 50
6.0
2.0
4.5 150
6.0
2.0
4.5 50
6.0
R_L = 1 KΩ
R_L = 1 KΩ
R_L = 1 KΩ
T_A = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
25 60
75
90
7 12
19
18 ns
6 10
13
15
36 90
115
135
12 18
23
27 ns
10 15
20
23
51 130
165
195
17 26
33
39 ns
14 22
28
33
48 125
155
190
16 25
31
38 ns
14 21
25
32
63 165
205
250
21 33
41
50 ns
18 28
35
43
32 125
155
190
15 25
31
38 ns
14 21
26
32
CAPACITIVE CHARACTERISTICS
Test Condition
Value
Symbol
Parameter
V_CC
(V)
T_A = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
C_IN Input Capacitance 5.0
5 10
10
10 pF
C_OUT
Output
Capacitance
5.0
10
pF
C_PD Power Dissipation
Capacitance (note 5.0
31
pF
1)
1) C_PD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I_CC(opr) = C_PD x V_CC x f_IN + I_CC/8 (per circuit)
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