TC74ACT240,244P/F/FT
2014-03-01
4
Electrical Characteristics
DC Characteristics
Test Condition Ta = 25°C
Ta =
−40 to 85°C
Characteristics Symbol
V
CC
(V)
Min Typ. Max Min Max
Unit
High-level input
voltage
V
IH
― 4.5 to 5.5 2.0 ― ― 2.0 ― V
Low-level input
voltage
V
IL
― 4.5 to 5.5 ― ― 0.8 ― 0.8 V
High-level output
voltage
V
OH
V
IN
= V
IH
or
V
IL
I
OH
= −50 μA
I
OH
= −24 mA
I
OH
= −75 mA (Note)
4.5
4.5
5.5
4.4
3.94
―
4.5
―
―
―
―
―
4.4
3.80
3.85
―
―
―
V
Low-level output
voltage
V
OL
V
IN
= V
IH
or
V
IL
I
OL
= 50 μA
I
OL
= 24 mA
I
OL
= 75 mA (Note)
4.5
4.5
5.5
―
―
―
0.0
―
―
0.1
0.36
―
―
―
―
0.1
0.44
1.65
V
3-state output
off-state current
I
OZ
V
IN
= V
IH
or V
IL
V
OUT
= V
CC
or GND
5.5 ― ― ±0.5 ― ±5.0 μA
Input leakage
current
I
IN
V
IN
= V
CC
or GND 5.5 ― ― ±0.1 ― ±1.0 μA
I
CC
V
IN
= V
CC
or GND 5.5 ― ― 8.0 ― 80.0 μA
Quiescent supply
current
I
C
Per input: V
IN
= 3.4 V
Other input: V
CC
or GND
5.5 ― ― 1.35 ― 1.5 mA
Note: This spec indicates the capability of driving 50 Ω transmission lines.
One output should be tested at a time for a 10 ms maximum duration.
AC Characteristics
(C
L
= 50 pF, R
L
= 500 Ω, input: t
r
= t
f
= 3 ns)
Test Condition Ta = 25°C
Ta =
−40 to 85°C
Characteristics Symbol
V
CC
(V) Min Typ. Max Min Max
Unit
Propagation delay
time
t
pLH
t
pHL
― 5.0 ± 0.5 ― 5.7 8.0 1.0 9.0 ns
Output enable time
t
pZL
t
pZH
― 5.0 ± 0.5 ― 6.0 9.0 1.0 10.5 ns
Output disable time
t
pLZ
t
pHZ
― 5.0 ± 0.5 ― 5.9 8.5 1.0 10.0 ns
Input capacitance C
IN
― ― 5 10 ― 10 pF
Output capacitance C
OUT
― ― 10 ― ― ― pF
TC74ACT240 ― 25 ― ― ―
Power dissipation
capacitance
C
PD
(Note)
TC74ACT244 ― 29 ― ― ―
pF
Note: C
PD
is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load.
Average operating current can be obtained by the equation:
I
CC (opr)
= C
PD
·V
CC
·f
IN
+ I
CC
/8 (per bit)