Datasheet

SN54AHCT244, SN74AHCT244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCLS228L – OCTOBER 1995 – REVISED JULY 2003
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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 SN54AHCT244 SN74AHCT244
UNIT
PARAMETER
(INPUT) (OUTPUT) CAPACITANCE
MIN TYP MAX MIN MAX MIN MAX
UNIT
t
PLH
A
Y
C
L
=15
p
F
5.4* 7.4* 1* 8.5* 1 8.5
ns
t
PHL
A
Y
C
L
=
15
pF
5.4* 7.4* 1* 8.5* 1 8.5
ns
t
PZH
OE
Y
C
L
=15
p
F
7.7* 10.4* 1* 12* 1 12
ns
t
PZL
OE
Y
C
L
=
15
pF
7.7* 10.4* 1* 12* 1 12
ns
t
PHZ
OE
Y
C
L
=15
p
F
5* 9.4* 1* 10* 1 10
ns
t
PLZ
OE
Y
C
L
=
15
pF
5* 9.4* 1* 10* 1 10
ns
t
PLH
A
Y
C
L
=50
p
F
5.9 8.4 1 9.5 1 9.5
ns
t
PHL
A
Y
C
L
=
50
pF
5.9 8.4 1 9.5 1 9.5
ns
t
PZH
OE
Y
C
L
=50
p
F
8.2 11.4 1 13 1 13
ns
t
PZL
OE
Y
C
L
=
50
pF
8.2 11.4 1 13 1 13
ns
t
PHZ
OE
Y
C
L
=50
p
F
8.8 11.4 1 13 1 13
ns
t
PLZ
OE
Y
C
L
=
50
pF
8.8 11.4 1 13 1 13
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.
noise characteristics, V
CC
= 5 V, C
L
= 50 pF, T
A
= 25°C (see Note 4)
PARAMETER
SN74AHCT244
UNIT
PARAMETER
MIN TYP MAX
UNIT
V
OH(V)
Quiet output, minimum dynamic V
OH
4.1 V
V
IH(D)
High-level dynamic input voltage 2 V
V
IL(D)
Low-level dynamic input voltage 0.8 V
NOTE 4: Characteristics are for surface-mount packages only.
operating characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
pd
Power dissipation capacitance No load, f = 1 MHz 8.2 pF