Data Sheet

HEF4049B_5 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 05 — 11 November 2008 5 of 11
NXP Semiconductors
HEF4049B
Hex inverting buffers
[1] The typical values of the propagation delay and transition times are calculated from the extrapolation formulas shown (C
L
in pF).
12. Waveforms
t
THL
HIGH to LOW output
transition time
see Figure 5 5 V
[1]
3 ns + (0.35 ns/pF)C
L
-2040ns
10 V 3 ns + (0.14 ns/pF)C
L
-1020ns
15 V 2 ns + (0.09 ns/pF)C
L
- 7 14 ns
t
TLH
LOW to HIGH output
transition time
see Figure 5 5 V
[1]
10 ns + (1.00 ns/pF)C
L
- 60 120 ns
10 V 9 ns + (0.42 ns/pF)C
L
-3060ns
15 V 6 ns + (0.28 ns/pF)C
L
-2040ns
Table 7. Dynamic characteristics
…continued
V
SS
= 0 V; C
L
= 50 pF; t
r
= t
f
≤ 20 ns; T
amb
= 25 ° C; unless otherwise specified.
Symbol Parameter Conditions V
DD
Extrapolation formula Min Typ Max Unit
Table 8. Dynamic power dissipation P
D
P
D
can be calculated from the formulas shown. V
SS
= 0 V; t
r
= t
f
≤ 20 ns; T
amb
= 25 ° C.
Symbol Parameter V
DD
Typical formula for P
D
(µW) where:
P
D
dynamic power
dissipation
5 V P
D
= 2500 × f
i
+ Σ(f
o
× C
L
) × V
DD
2
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
DD
= supply voltage in V;
Σ(C
L
× f
o
) = sum of the outputs.
10 V P
D
= 11000 × f
i
+ Σ(f
o
× C
L
) × V
DD
2
15 V P
D
= 35000 × f
i
+ Σ(f
o
× C
L
) × V
DD
2
Measurement points are given in Table 9.
V
OL
and V
OH
are typical output voltage levels that occur with the output load.
Fig 5. Input (nA) to output (nY) propagation delays and transition times
001aai336
input
output
t
PLH
t
PHL
0 V
V
I
V
M
V
M
V
OH
V
OL
t
TLH
t
THL
90 %
10 %
10 %
90 %
t
r
t
f
Table 9. Measurement points
Input Output
V
M
V
I
V
M
V
X
V
Y
0.5V
DD
0 V to V
DD
0.5V
DD
0.1V
DD
0.9V
DD