74LVC646A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 5 — 28 March 2013 10 of 23
NXP Semiconductors
74LVC646A
Octal bus transceiver/register; 3-state
[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
t
h
hold time An, Bn to CPAB, CPBA; see Figure 7
V
CC
= 1.65 V to 1.95 V 3.0 - - 3.0 - ns
V
CC
= 2.3 V to 2.7 V 2.0 - - 2.0 - ns
V
CC
= 2.7 V 1.0 - - 1.0 - ns
V
CC
= 3.0 V to 3.6 V 1.0 0.3 - 1.0 - ns
f
max
maximum
frequency
see Figure 7
V
CC
= 1.65 V to 1.95 V 100 - - 80 - MHz
V
CC
= 2.3 V to 2.7 V 125 - - 100 - MHz
V
CC
= 2.7 V 150 - - 120 - MHz
V
CC
= 3.0 V to 3.6 V 150 250 - 120 - MHz
t
sk(o)
output skew
time
V
CC
= 3.0 V to 3.6 V
[3]
- - 1.0 - 1.5 ns
C
PD
power
dissipation
capacitance
per input; V
I
=GNDtoV
CC
[4]
V
CC
= 1.65 V to 1.95 V - 8.0 - - - pF
V
CC
= 2.3 V to 2.7 V - 11.7 - - - pF
V
CC
= 3.0 V to 3.6 V - 15.0 - - - pF
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V). For test circuit see Figure 11.
Symbol Parameter Conditions T
amb
= 40 C to +85 C 40 C to +125 C Unit
Min Typ
[1]
Max Min Max
