NXP Semiconductors
74LVC244A; 74LVCH244A
Octal buffer/line driver; 3-state
Table 7.
Dynamic characteristics
…continued
Voltages are referenced to GND (ground = 0 V). For test circuit see
Figure 8.
Symbol Parameter
C
PD
power
dissipation
capacitance
Conditions
per buffer; V
I
= GND to V
CC
; V
CC
= 3.3 V
−40 °C
to +85
°C
Min
-
Typ
[2]
10
Max
-
−40 °C
to +125
°C
Unit
Min
-
Max
-
pF
[1]
t
pd
is the same as t
PLH
and t
PHL
.
t
en
is the same as t
PZL
and t
PZH
.
t
dis
is the same as t
PLZ
and t
PHZ
.
Typical values are measured at T
amb
= 25
°C.
Typical values are measured at T
amb
= 25
°C
and V
CC
= 3.3 V.
Skew between any two outputs of the same package switching in the same direction. This parameter is guaranteed by design.
C
PD
is used to determine the dynamic power dissipation (P
D
in
µW).
P
D
= C
PD
×
V
CC2
×
f
i
×
N +
Σ(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz; f
o
= output frequency in MHz
C
L
= output load capacitance in pF
V
CC
= supply voltage in Volts
N = number of inputs switching
Σ(C
L
×
V
CC2
×
f
o
) = sum of the outputs.
[2]
[3]
[4]
[5]
11. AC waveforms
V
I
nAn input
GND
t
PLH
V
OH
nYn output
V
OL
V
M
V
M
mna171
V
M
V
M
t
PHL
Measurement points are given in
Logic levels: V
OL
and V
OH
are typical output voltage levels that occur with the output load.
Fig 6.
The input (nAn) to output (nYn) propagation delays
74LVC_LVCH244A_6
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 — 13 August 2009
8 of 18
PHILIPS [ NXP SEMICONDUCTORS ]
