Datasheet

Philips Semiconductors Product specification
74LVC125A
Quad buffer/line driver with 5-volt
tolerant inputs/outputs (3-state)
1998 Apr 28
6
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
X
= V
OL
+ 0.3 V at V
CC
≥ 2.7 V
V
X
= V
OL
+ 0.1 V at V
CC
> 2.7 V
V
Y
= V
OH
– 0.3 V at V
CC
≥ 2.7 V
V
Y
= V
OH
– 0.1 V at V
CC
< 2.7 V
SV00459
V
M
nA INPUT
nY OUTPUT
V
M
t
PLH
t
PHL
GND
V
l
V
OL
V
OH
Figure 1. Input (nA) to output (nY) propagation delays.
SV00458
outputs
disabled
outputs
enabled
outputs
enabled
t
PHZ
t
PZH
t
PZL
t
PLZ
V
X
V
Y
V
M
V
M
nOE Input
V
I
GND
V
CC
V
OL
V
OH
GND
OUTPUT
HIGH-to-OFF
OFF-to-HIGH
OUTPUT
LOW-to-OFF
OFF-to-LOW
V
M
Figure 2. 3-state enable and disable times.
TEST CIRCUIT
PULSE
GENERATOR
R
T
V
IN
D.U.T.
V
OUT
C
L
V
CC
R
L
=500 Ω
SWITCH POSITION
TEST SWITCH
t
PLH
/t
PHL
Open
t
PLZ
/t
PZL
2<V
CC
t
PHZ
/t
PZH
GND
Test Circuit for 3-State Outputs
Open
GND
S
1
2<V
CC
DEFINITIONS
V
CC
t 2.7V
2.7 – 3.6V
V
IN
V
CC
2.7V
R
L
= Load resistor
C
L
= Load capacitance includes jig and probe capacitance
R
T
= Termination resistance should be equal to Z
OUT
of pulse generators.
SW00047
R
L
=500 Ω
Figure 3. Load circuitry for switching times.