Datasheet

SN54ALS240A, SN54AS240A, SN74ALS240A, SN74AS240A
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDAS214E – DECEMBER 1982 – REVISED AUGUST 2002
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54AS240A SN74AS240A
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP
†
MAX MIN TYP
†
MAX
UNIT
V
IK
V
CC
= 4.5 V, I
I
= –18 mA –1.2 –1.2 V
V
CC
=45Vto55V
I
OH
= –2 mA V
CC
–2 V
CC
–2
V
OH
V
CC
=
4
.
5
V
to
5
.
5
V
I
OH
= –3 mA 2.4 3.4 2.4 3.4
V
V
OH
V
CC
=45V
I
OH
= –12 mA 2.4
V
V
CC
=
4
.
5
V
I
OH
= –15 mA 2.4
V
OL
V
CC
=45V
I
OL
= 48 mA 0.27 0.55
V
V
OL
V
CC
=
4
.
5
V
I
OL
= 64 mA 0.31 0.55
V
I
OZH
V
CC
= 5.5 V, V
O
= 2.7 V 50 50 µA
I
OZL
V
CC
= 5.5 V, V
O
= 0.4 V –50 –50 µA
I
I
V
CC
= 5.5 V, V
I
= 7 V 0.1 0.1 mA
I
IH
V
CC
= 5.5 V, V
I
= 2.7 V 20 20 µA
I
IL
A inputs
V
CC
=55V
V
I
=04V
–1 –1
mA
I
IL
OE inputs
V
CC
=
5
.
5
V
,
V
I
=
0
.
4
V
–0.5 –0.5
mA
I
O
‡
V
CC
= 5.5 V, V
O
= 2.25 V –50 –150 –50 –150 mA
Outputs high 11 17 11 17
I
CC
V
CC
= 5.5 V
Outputs low 51 75 51 75
mA
Outputs disabled 24 38 24 38
†
All typical values are at V
CC
= 5 V, T
A
= 25°C.
‡
The output conditions have been chosen to produce a current that closely approximates one-half of the true short-circuit output current, I
OS
.
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 4.5 V to 5.5 V,
C
L
= 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
T
A
= MIN to MAX
§
UNIT
SN54ALS240A SN74ALS240A
MIN MAX MIN MAX
t
PLH
A
Y
2 22 2 9
ns
t
PHL
A
Y
2 11 2 9
ns
t
PZH
OE
Y
4 34 5 13
ns
t
PZL
OE
Y
5 26 5 18
ns
t
PHZ
OE
Y
1 15 2 10
ns
t
PLZ
OE
Y
3 24 3 12
ns
§
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.