Datasheet

www.fairchildsemi.com 4
74LCX157
AC Electrical Characteristics
Note 4: 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
). Parameter guaranteed by design.
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
= 50 pF C
L
= 50 pF C
L
= 30 pF
Min Max Min Max Min Max
t
PHL
Propagation Delay 1.5 7.0 1.5 8.0 1.5 8.4
ns
t
PLH
S→Z
n
1.57.01.58.01.58.4
t
PHL
Propagation Delay 1.5 7.0 1.5 8.0 1.5 8.4
ns
t
PLH
E→Z
n
1.57.01.58.01.58.4
t
PHL
Propagation Delay 1.5 5.8 1.5 6.3 1.5 7.0
ns
t
PLH
I
n
→Z
n
1.55.81.56.31.57.0
t
OSHL
Output to Output Skew 1.0
ns
t
OSLH
(Note 4) 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
CL= 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
CL= 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
7pF
C
OUT
Output Capacitance V
CC
= 3.3V, V
I
= 0V or V
CC
8pF
C
PD
Power Dissipation Capacitance V
CC
= 3.3V, V
I
= 0V or V
CC
, f = 10 MHz 25 pF