Datasheet

Philips Semiconductors Product specification
74LVC14A
Hex inverting Schmitt-trigger with 5V
tolerant input
1998 Apr 28
6
AC CHARACTERISTICS
GND = 0 V; t
r
= t
f
v 2.5 ns; C
L
= 50 pF; R
L
= 500; T
amb
= –40C to +85C
LIMITS
SYMBOL PARAMETER WAVEFORM
V
CC
= 3.3V ±0.3V V
CC
= 2.7V V
CC
= 1.2V
UNIT
MIN TYP
1
MAX MIN TYP MAX TYP
t
PHL
/
t
PLH
Propagation delay
nA to nY
Figure 1, 2 1.5 4.5 6.4 1.5 5.0 7.5 18 ns
NOTE:
1. These typical values are at V
CC
= 3.3V and T
amb
= 25°C.
AC WAVEFORMS
V
M
= 1.5 V at V
CC
w 2.7 V
V
M
= 0.5  V
CC
at V
CC
< 2.7 V
V
OL
and V
OH
are the typical output voltage drop that occur with the
output load.
V
M
nA INPUT
nY OUTPUT
V
M
t
PLH
t
PHL
GND
V
I
V
OL
V
OH
SV00395
Figure 1. Input (nA) to output (nY) propagation delays.
TEST CIRCUIT
PULSE
GENERATOR
V
I
R
T
D.U.T.
V
O
C
L
50pF
S
1
2 x V
CC
Open
GND
500Ω
500Ω
V
CC
V
I
t 2.7V V
CC
2.7V – 3.6V 2.7V
Test S
1
GND
t
PLZ
/t
PZL
2 x V
CC
t
PHZ
/t
PZH
t
PLH
/t
PHL
Open
SY00003
V
CC
Figure 2. Load circuitry for switching times.
APPLICATION INFORMATION
All values given are typical unless otherwise specified.
Note to Figure 7: f +
1
T
[
1
0.8 RC
0.5
1.0
1.5
2.0
average
I
CC
(mA)
V
CC
(V)
1.8 2.1 2.41.5 3.33.02.7 3.6
negative-going
edge
positive-going
edge
SV00445
Figure 3. Average I
CC
for LVC Schmitt-trigger devices;
linear change of V
i
between 0.8 V to 2.0 V.
SV00433
R
C
Figure 4. Relaxation oscillator using the LVC14.