Datasheet
74LVC_LVCH244A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 8 — 26 June 2013 8 of 19
NXP Semiconductors
74LVC244A; 74LVCH244A
Octal buffer/line driver; 3-state
10. Dynamic characteristics
[1] Typical values are measured at T
amb
=25C and V
CC
= 1.2 V, 1.8 V, 2.5 V, 2.7 V, and 3.3 V respectively.
[2] 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
.
[3] Skew between any two outputs of the same package switching in the same direction. This parameter is guaranteed by design.
[4] C
PD
is used to determine the dynamic power dissipation (P
D
in W).
P
D
=C
PD
V
CC
2
f
i
N+(C
L
V
CC
2
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
(C
L
V
CC
2
f
o
) = sum of the outputs.
Table 7. Dynamic characteristics
Voltages are referenced to GND (ground = 0 V). For test circuit see Figure 8.
Symbol Parameter Conditions 40 C to +85 C 40 C to +125 C Unit
Min Typ
[1]
Max Min Max
t
pd
propagation
delay
nAntonYn; see Figure 6
[2]
V
CC
= 1.2 V - 17.0 - - - ns
V
CC
= 1.65 V to 1.95 V 1.5 6.4 13.7 1.5 15.8 ns
V
CC
= 2.3 V to 2.7 V 1.0 3.4 7.1 1.0 8.2 ns
V
CC
= 2.7 V 1.5 3.4 6.9 1.5 9.0 ns
V
CC
= 3.0 V to 3.6 V 1.5 2.9 5.9 1.5 7.5 ns
t
en
enable time nOE to nYn; see Figure 7
[2]
V
CC
= 1.2 V - 24.0 - - - ns
V
CC
= 1.65 V to 1.95 V 1.5 7.0 17.3 1.5 20.0 ns
V
CC
= 2.3 V to 2.7 V 1.5 3.9 9.5 1.5 11.0 ns
V
CC
= 2.7 V 1.5 4.1 8.6 1.5 11.0 ns
V
CC
= 3.0 V to 3.6 V 1.0 3.2 7.6 1.0 9.5 ns
t
dis
disable time nOE to nYn; see Figure 7
[2]
V
CC
= 1.2 V - 9.0 - - - ns
V
CC
= 1.65 V to 1.95 V 2.2 4.5 9.8 2.2 11.3 ns
V
CC
= 2.3 V to 2.7 V 0.5 3.6 5.5 0.5 6.4 ns
V
CC
= 2.7 V 1.5 3.3 6.8 1.5 8.5 ns
V
CC
= 3.0 V to 3.6 V 1.5 3.1 5.8 1.5 7.5 ns
t
sk(o)
output skew
time
[3]
--1.0- 1.5ns
C
PD
power
dissipation
capacitance
per input; V
I
=GNDtoV
CC
[4]
V
CC
= 1.65 V to 1.95 V - 6.4 - - - pF
V
CC
= 2.3 V to 2.7 V - 9.6 - - - pF
V
CC
= 3.0 V to 3.6 V - 12.5 - - - pF