Datasheet

7
FIGURE 2. INPUTS OR SELECT TO OUTPUT PROPAGATION
DELAYS (AC/ACT257)
FIGURE 3. SELECT TO OUTPUT PROPAGATION DELAYS
(CD74ACT258)
90%
10%
t
f
= 3nst
r
= 3ns
nI
0
, nI
1
, S
t
PLH
t
PHL
V
S
Y
INPUT
LEVEL
GND
V
S
INPUT LEVEL
V
S
S
t
PLH
t
PHL
V
S
Y
DUT
OUTPUT
R
L
(NOTE)
OUTPUT
LOAD
500Ω
C
L
50pF
NOTE: For AC Series Only: When V
CC
= 1.5V, R
L
= 1kΩ.
FIGURE 4. PROPAGATION DELAY TIMES
AC ACT
Input Level V
CC
3V
Input Switching Voltage, V
S
0.5 V
CC
1.5V
Output Switching Voltage, V
S
0.5 V
CC
0.5 V
CC
CD54/74AC257, CD54/74ACT257, CD74ACT258