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74AC240
4/9
AC ELECTRICAL CHARACTERISTICS (C
L
= 50 pF, R
L
= 500 Ω, Input t
r
= t
f
= 3ns)
(*) Voltage range is 3.3V ± 0.3V
(**) Voltage range is 5.0V ±
0.5V
CAPACITIVE CHARACTERISTICS
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)
TEST CIRCUIT
C
L
= 50pF or equivalent (includes jig and probe capacitance)
R
L
= R
1
= 500Ω or equivalent
R
T
= Z
OUT
of pulse generator (typically 50Ω)
Symbol Parameter
Test Condition Value
Unit
V
CC
(V)
T
A
= 25°C
-40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
t
PLH
t
PHL
Propagation Delay
Time
3.3
(*)
1.5 5.7 8.0 1.5 9.0 1.5 11.0
ns
5.0
(**)
1.5 4.2 6.5 1.5 7.0 1.5 8.5
t
PZL
t
PZH
Output Enable
Time
3.3
(*)
1.5 7.0 10.5 1.5 11.0 1.5 13.0
ns
5.0
(**)
1.5 5.0 8.0 1.5 8.5 1.5 10.5
t
PLZ
t
PHZ
Output Disable
Time
3.3
(*)
1.5 7.0 10.5 1.5 11.5 1.5 13.5
ns
5.0
(**)
1.5 6.5 9.0 1.5 9.5 1.5 11.0
Symbol Parameter
Test Condition Value
Unit
V
CC
(V)
T
A
= 25°C
-40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
C
IN
Input Capacitance
5.0 5 pF
C
OUT
Output
Capacitance
5.0 9
pF
C
PD
Power Dissipation
Capacitance (note
1)
5.0
f
IN
= 10MHz
21 pF
TEST SWITCH
t
PLH
, t
PHL
Open
t
PZL
, t
PLZ
2V
CC
t
PZH
, t
PHZ
Open
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