Datasheet

74VHC_VHCT244_1 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 01 — 17 August 2009 7 of 16
NXP Semiconductors
74VHC244; 74VHCT244
Octal buffer/line driver; 3-state
10. Dynamic characteristics
Table 7. Dynamic characteristics
GND = 0 V. For test circuit see Figure 8.
Symbol Parameter Conditions 25 °C −40 °C to +85 °C −40 °C to +125 °C Unit
Min Typ
[1]
Max Min Max Min Max
For type 74VHC244
t
pd
propagation
delay
nAn to nYn; see Figure 6
[2]
V
CC
= 3.0 V to 3.6 V
C
L
= 15 pF - 5.0 8.4 1.0 10.0 1.0 10.5 ns
C
L
= 50 pF - 7.0 11.9 1.0 13.5 1.0 15.0 ns
V
CC
= 4.5 V to 5.5 V
C
L
= 15 pF - 3.4 5.5 1.0 6.5 1.0 7.0 ns
C
L
= 50 pF 5.0 7.5 1.0 8.5 1.0 9.5 ns
t
en
enable time nOE to nYn; see Figure 7
[2]
V
CC
= 3.0 V to 3.6 V
C
L
= 15 pF - 6.5 10.6 1.0 12.5 1.0 13.5 ns
C
L
= 50 pF - 7.5 14.1 1.0 16.0 1.0 18.0 ns
V
CC
= 4.5 V to 5.5 V
C
L
= 15 pF - 4.0 7.3 1.0 8.5 1.0 9.5 ns
C
L
= 50 pF - 5.5 9.3 1.0 10.5 1.0 12.0 ns
t
dis
disable time nOE to nYn; see Figure 7
[2]
V
CC
= 3.0 V to 3.6 V
C
L
= 15 pF - 5.5 9.7 1.0 11.0 1.0 12.5 ns
C
L
= 50 pF - 10.0 14.0 1.0 16.0 1.0 17.5 ns
V
CC
= 4.5 V to 5.5 V
C
L
= 15 pF - 4.8 7.2 1.0 8.5 1.0 9.0 ns
C
L
= 50 pF - 7.0 9.2 1.0 10.5 1.0 11.5 ns
C
PD
power
dissipation
capacitance
C
L
= 50 pF; f
i
= 1 MHz;
V
I
= GND to V
CC
[3]
-10- - - - -pF