Datasheet

5 www.fairchildsemi.com
74LCX138
AC Electrical Characteristics
Note 6: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH-to-LOW (t
OSHL
) or LOW-to-HIGH (t
OSLH
).
Dynamic Switching Characteristics
Capacitance
Symbol Parameter
T
A
= −40°C to +85°C, R
L
= 500Ω
Units
V
CC
= 3.3V ± 0.3V V
CC
= 2.7V V
CC
= 2.5V ± 0.2V
C
L
= 50pF C
L
= 50pF C
L
= 30pF
Min Max Min Max Min Max
t
PHL
Propagation Delay 1.5 6.0 1.5 7.0 1.5 7.2
ns
t
PLH
An to Qn 1.5 6.0 1.5 7.0 1.5 7.2
t
PHL
Propagation Delay 1.5 6.5 1.5 7.5 1.5 8.4
ns
t
PLH
E3 to Qn 1.5 6.5 1.5 7.5 1.5 8.4
t
PHL
Propagation Delay 1.5 6.0 1.5 7.0 1.5 7.2
ns
t
PLH
E1 or E2 to Qn 1.5 6.0 1.5 7.0 1.5 7.2
t
OSHL
Output to Output Skew (Note 6) 1.0
ns
t
OSLH
1.0
Symbol Parameter Conditions
V
CC
T
A
= 25°C
Units
(V) Typical
V
OLP
Quiet Output Dynamic Peak V
OL
C
L
= 50 pF, V
IH
= 3.3V, V
IL
= 0V 3.3 0.8
V
C
L
= 30 pF, V
IH
= 2.5V, V
IL
= 0V 2.5 0.6
V
OLV
Quiet Output Dynamic Valley V
OL
C
L
= 50 pF, V
IH
= 3.3V, V
IL
= 0V 3.3 −0.8
V
C
L
= 30 pF, V
IH
= 2.5V, V
IL
= 0V 2.5 −0.6
Symbol Parameter Conditions Typical Units
C
IN
Input Capacitance V
CC
= Open, V
I
= 0V or V
CC
7.0 pF
C
OUT
Output Capacitance V
CC
= 3.3V, V
I
= 0V or V
CC
8.0 pF
C
PD
Power Dissipation Capacitance V
CC
= 3.3V, V
I
= 0V or V
CC
, f = 10 MHz 25.0 pF