Datasheet
SCLS128D − DECEMBER 1982 − REVISED AUGUST 2003
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
V
CC
T
A
= 25°C SN54HC240 SN74HC240
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
2 V 50 100 150 125
t
pd
A Y
4.5 V 10 20 30 25
ns
t
pd
A
Y
6 V 9 17 25 21
ns
2 V 75 150 225 190
t
en
OE Y
4.5 V 15 30 45 38
ns
t
en
OE
Y
6 V 13 26 38 32
ns
2 V 44 150 225 190
t
dis
OE Y
4.5 V 22 30 45 38
ns
t
dis
OE
Y
6 V 21 26 38 32
ns
2 V 28 60 90 75
t
t
Y
4.5 V 8 12 18 15
ns
t
t
Y
6 V 6 10 15 13
ns
switching characteristics over recommended operating free-air temperature range, C
L
= 150 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
V
CC
T
A
= 25°C SN54HC240 SN74HC240
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
2 V 75 150 225 190
t
pd
A Y
4.5 V 15 30 45 38
ns
t
pd
A
Y
6 V 13 26 38 32
ns
2 V 100 200 300 250
t
en
OE Y
4.5 V 20 40 60 50
ns
t
en
OE
Y
6 V 17 34 51 43
ns
2 V 45 210 315 265
t
t
Y
4.5 V 17 42 63 53
ns
t
t
Y
6 V 13 36 53 45
ns
operating characteristics, T
A
= 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
pd
Power dissipation capacitance per buffer/driver No load 35 pF