TC74VHC240,244F/FT/FK
2014-03-01
5
AC Characteristics
(input: t
r
= t
f
= 3 ns)
Test Condition Ta = 25°C
Ta
=
−40 to 85°C
Characteristics Symbol
V
CC
(V) C
L
(pF) Min Typ. Max Min Max
Unit
15 ⎯ 5.3 7.5 1.0 9.0
3.3 ± 0.3
50
⎯ 7.8 11.0 1.0 12.5
15 ⎯ 3.6 5.5 1.0 6.5
Propagation delay
time
(TC74VHC240)
t
pLH
t
pHL
⎯
5.0
± 0.5
50
⎯ 5.1 7.5 1.0 8.5
ns
15 ⎯ 5.8 8.4 1.0 10.0
3.3 ± 0.3
50
⎯ 8.3 11.9 1.0 13.5
15 ⎯ 3.9 5.5 1.0 6.5
Propagation delay
time
(TC74VHC244)
t
pLH
t
pHL
⎯
5.0
± 0.5
50
⎯ 5.4 7.5 1.0 8.5
ns
15 ⎯ 6.6 10.6 1.0 12.5
3.3 ± 0.3
50
⎯ 9.1 14.1 1.0 16.0
15 ⎯ 4.7 7.3 1.0 8.5
3-state output enable
time
t
pZL
t
pZH
R
L
= 1 kΩ
5.0
± 0.5
50
⎯ 6.2 9.3 1.0 10.5
ns
3.3 ± 0.3 50 ⎯ 10.3 14.0 1.0 16.0
3-state output disable
time
t
pLZ
t
pHZ
R
L
= 1 kΩ
5.0
± 0.5 50 ⎯ 6.7 9.2 1.0 10.5
ns
3.3 ± 0.3 50 ⎯ ⎯ 1.5 ⎯ 1.5
Output to output skew
t
osLH
t
osHL
(Note 1)
5.0
± 0.5 50 ⎯ ⎯ 1.0 ⎯ 1.0
ns
Input capacitance C
IN
⎯ ⎯ 4 10 ⎯ 10 pF
Output capacitance C
OUT
⎯ ⎯ 6 ⎯ ⎯ ⎯ pF
TC74VHC240 ⎯ 17 ⎯ ⎯ ⎯
Power dissipation
capacitance (Note 2)
C
PD
TC74VHC244
⎯ 19 ⎯ ⎯ ⎯
pF
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)
Test Condition Ta = 25°C
Characteristics Symbol
V
CC
(V) Typ. Limit
Unit
Quiet output maximum dynamic V
OL
V
OLP
C
L
= 50 pF 5.0 0.5 0.8 V
Quiet output minimum dynamic V
OL
V
OLV
C
L
= 50 pF 5.0 −0.5 −0.8 V
Minimum high level dynamic input voltage V
IHD
C
L
= 50 pF 5.0 ⎯ 3.5 V
Maximum low level dynamic input voltage V
ILD
C
L
= 50 pF 5.0 ⎯ 1.5 V
