9397 750 14592 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 15 February 2005 7 of 16
Philips Semiconductors
74ALVC14
Hex inverting Schmitt trigger
11. Dynamic characteristics
[1] Typical values are measured at T
amb
= 25 °C.
[2] C
PD
is used to determine the dynamic power dissipation (P
D
in µW).
P
D
= C
PD
× V
CC
2
× f
i
× N + Σ(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 V;
N = number of inputs switching;
Σ(C
L
× V
CC
2
× f
o
) = sum of the outputs.
[3] The condition is V
I
= GND to V
CC
.
12. Waveforms
Table 8: Dynamic characteristics
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 7.
Symbol Parameter Conditions Min Typ Max Unit
T
amb
= −40 °C to +85 °C
[1]
t
PHL
,
t
PLH
propagation delay nA to nY see Figure 6
V
CC
= 1.65 V to 1.95 V 1.0 2.9 4.4 ns
V
CC
= 1.95 V to 2.7 V 1.0 2.2 3.7 ns
V
CC
= 2.7 V 1.0 2.8 3.9 ns
V
CC
= 3.0 V to 3.6 V 1.0 2.4 3.4 ns
C
PD
power dissipation
capacitance per buffer
V
CC
= 3.3 V
[2] [3]
-25-pF
V
OL
and V
OH
are typical output voltage drop that occur with the output load.
Fig 6. Propagation delay input (nA) to output (nY)
Table 9: Measurement points
Supply Input Output
V
CC
V
M
V
M
1.65 V to 1.95 V 0.5 × V
CC
0.5 × V
CC
2.3 V to 2.7 V 0.5 × V
CC
0.5 × V
CC
2.7 V 1.5 V 1.5 V
3.0 V to 3.6 V 1.5 V 1.5 V
mna344
t
PHL
t
PLH
V
M
V
M
nA input
nY output
GND
V
I
V
OH
V
OL