Philips Semiconductors Product specification
74LVC125Quad buffer/line driver; 3-State
1997 Mar 18
5
AC CHARACTERISTICS
GND = 0 V; t
r
= t
f
= 2.5 ns; C
L
= 50 pF; R
L
= 500; T
amb
= –40C to +85C.
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, 3 3.5 6.5 3.9 7.0 ns
t
PZH
t
PZL
3-state output enable
time nOE
to nY
Figure 2, 3 3.8 7.0 4.4 8.0 ns
t
PHZ
t
PLZ
3-state output disable
time nOE
to nY
Figure 2, 3 3.3 5.5 4.0 6.5 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
X
= V
OL
+ 0.3 V at V
CC
≥ 2.7 V;
V
X
= V
OL
+ 0.1 × V
CC
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
CC
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
V
I
R
T
D.U.T.
V
O
C
L
50pF
S
1
2 < 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 < V
CC
t
PHZ
/t
PZH
t
PLH
/t
PHL
Open
SY00003
V
CC
Figure 3. Load circuitry for switching times.
