Datasheet
SN54AHC240, SN74AHC240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCLS251H – OCTOBER 1995 – REVISED JULY 2003
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range,
V
CC
= 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO LOAD
T
A
= 25°C SN54AHC240 SN74AHC240
UNIT
PARAMETER
(INPUT) (OUTPUT) CAPACITANCE
MIN TYP MAX MIN MAX MIN MAX
UNIT
t
PLH
A
Y
C
L
=15
p
F
5.3* 7.5* 1* 9* 1 9
ns
t
PHL
A
Y
C
L
=
15
pF
5.3* 7.5* 1* 9* 1 9
ns
t
PZH
OE
Y
C
L
=15
p
F
6.6* 10.6* 1* 12.5* 1 12.5
ns
t
PZL
OE
Y
C
L
=
15
pF
6.6* 10.6* 1* 12.5* 1 12.5
ns
t
PHZ
OE
Y
C
L
=15
p
F
7.8* 11.5* 1* 12.5* 1 12.5
ns
t
PLZ
OE
Y
C
L
=
15
pF
7.8* 11.5* 1* 12.5* 1 12.5
ns
t
PLH
A
Y
C
L
=50
p
F
7.8 11 1 12.5 1 12.5
ns
t
PHL
A
Y
C
L
=
50
pF
7.8 11 1 12.5 1 12.5
ns
t
PZH
OE
Y
C
L
=50
p
F
9.1 14.1 1 16 1 16
ns
t
PZL
OE
Y
C
L
=
50
pF
9.1 14.1 1 16 1 16
ns
t
PHZ
OE
Y
C
L
=50
p
F
10.3 14 1 16 1 16
ns
t
PLZ
OE
Y
C
L
=
50
pF
10.3 14 1 16 1 16
ns
t
sk(o)
C
L
= 50 pF 1.5** 1.5 ns
∗
On products compliant to MIL-PRF-38535, this parameter is not production tested.
∗∗
On products compliant to MIL-PRF-38535, this parameter does not apply.
switching characteristics over recommended operating free-air temperature range,
V
CC
= 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO LOAD
T
A
= 25°C SN54AHC240 SN74AHC240
UNIT
PARAMETER
(INPUT) (OUTPUT) CAPACITANCE
MIN TYP MAX MIN MAX MIN MAX
UNIT
t
PLH
A
Y
C
L
=15
p
F
3.6* 5.5* 1* 6.5* 1 6.5
ns
t
PHL
A
Y
C
L
=
15
pF
3.6* 5.5* 1* 6.5* 1 6.5
ns
t
PZH
OE
Y
C
L
=15
p
F
4.7* 7.3* 1* 8.5* 1 8.5
ns
t
PZL
OE
Y
C
L
=
15
pF
4.7* 7.3* 1* 8.5* 1 8.5
ns
t
PHZ
OE
Y
C
L
=15
p
F
5.2* 7.2* 1* 8.5* 1 8.5
ns
t
PLZ
OE
Y
C
L
=
15
pF
5.2* 7.2* 1* 8.5* 1 8.5
ns
t
PLH
A
Y
C
L
=50
p
F
5.1 7.5 1 8.5 1 8.5
ns
t
PHL
A
Y
C
L
=
50
pF
5.1 7.5 1 8.5 1 8.5
ns
t
PZH
OE
Y
C
L
=50
p
F
6.2 9.3 1 10.5 1 10.5
ns
t
PZL
OE
Y
C
L
=
50
pF
6.2 9.3 1 10.5 1 10.5
ns
t
PHZ
OE
Y
C
L
=50
p
F
6.7 9.2 1 10.5 1 10.5
ns
t
PLZ
OE
Y
C
L
=
50
pF
6.7 9.2 1 10.5 1 10.5
ns
t
sk(o)
C
L
= 50 pF 1** 1 ns
∗
On products compliant to MIL-PRF-38535, this parameter is not production tested.
∗∗
On products compliant to MIL-PRF-38535, this parameter does not apply.