TC74VHCT240,244AF/AFT/AFK
AC Characteristics
(input: t
r
=
t
f
=
3 ns)
Characteristics
Propagation delay
time
(TC74VHCT240A)
Propagation delay
time
(TC74VHCT244A)
3-state output enable
time
3-state output disable
time
Output to output skew
Input capacitance
Output capacitance
Power dissipation
capacitance (Note 2)
Symbol
Test Condition
V
CC
(V)
t
pLH
t
pHL
t
pLH
t
pHL
t
pZL
t
pZH
t
pLZ
t
pHZ
t
osLH
t
osHL
C
IN
C
OUT
C
PD
TC74VHCT240A
TC74VHCT244A
⎯
Ta
=
25°C
C
L
(pF)
15
50
Min
⎯
⎯
⎯
⎯
⎯
⎯
⎯
Ta
=
−
40 to 85°C
Max
7.8
8.8
7.4
8.4
10.4
11.4
11.4
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max
9.0
Unit
Typ.
5.6
6.1
5.4
5.9
7.7
8.2
8.8
5.0
±
0.5
ns
10.0
8.5
ns
50
9.5
12.0
13.0
13.0
ns
15
50
50
⎯
5.0
±
0.5
15
R
L
=
1 k
Ω
5.0
±
0.5
R
L
=
1 k
Ω
5.0
±
0.5
ns
(Note 1) 5.0
±
0.5
⎯
⎯
50
⎯
⎯
⎯
⎯
⎯
⎯
1.0
10
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
1.0
10
⎯
⎯
⎯
ns
pF
pF
pF
4
9
19
18
Note 1: Parameter guaranteed by design.
t
osLH
= |t
pLHm
−
t
pLHn
|,
t
osHL
= |t
pHLm
−
t
pHLn
|
Note 2: 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)
Noise Characteristics
(input: t
r
=
t
f
=
3 ns)
Characteristics
Quiet output maximum dynamic V
OL
Quiet output minimum dynamic V
OL
Minimum high level dynamic input
voltage
Maximum low level dynamic input
voltage
Symbol
V
OLP
V
OLV
V
IHD
V
ILD
C
L
=
50 pF
C
L
=
50 pF
C
L
=
50 pF
C
L
=
50 pF
Test Condition
V
CC
(V)
5.0
5.0
5.0
5.0
Ta
=
25°C
Typ.
0.8
−
0.8
⎯
⎯
Limit
1.0
−
1.0
Unit
V
V
V
V
2.0
0.8
5
2007-10-01
TOSHIBA [ TOSHIBA SEMICONDUCTOR ]
