SN54LS240, SN54LS241, SN54LS244, SN54S240, SN54S241, SN54S244
SN74LS240, SN74LS241, SN74LS244, SN74S240, SN74S241, SN74S244
OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS
SDLS144B – APRIL 1985 – REVISED FEBRUARY 2002
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54LS’
SN74LS’
†
PARAMETER
UNIT
TEST CONDITIONS
‡
‡
MIN TYP
MAX
MIN TYP
MAX
V
V
V
V
= MIN,
= MIN
I = –18 mA
–1.5
–1.5
V
V
IK
Hysteresis
(V – V
CC
I
0.2
2.4
2
0.4
3.4
0.2
2.4
2
0.4
3.4
CC
)
T–
T+
= MIN,
= –3 mA
V
V
= 2 V,
= 2 V,
V
= MAX,
= 0.5 V,
CC
OH
IH
IL
I
V
V
V
OH
OL
V
= MIN,
= MAX
V
IL
CC
OH
IH
I
I
I
= 12 mA
= 24 mA
0.4
0.4
0.5
V
V
= MIN,
= MAX
V
IH
= 2 V,
OL
CC
IL
V
OL
V
V
= MAX,
= MAX
CC
IL
I
I
V
V
= 2 V,
= 2 V,
V
= 2.7 V
= 0.4 V
20
20
µA
µA
OZH
IH
O
O
V
V
= MAX,
= MAX
CC
IL
V
–20
–20
OZL
IH
I
I
I
I
V
V
V
V
= MAX,
= MAX,
= MAX,
= MAX,
V = 7 V
0.1
20
0.1
20
mA
µA
I
CC
CC
CC
CC
I
V = 2.7 V
I
IH
IL
V
IL
= 0.4 V
–0.2
–225
27
–0.2
–225
27
mA
mA
§
–40
–40
OS
Outputs high
Outputs low
All
17
26
27
29
32
17
26
27
29
32
’LS240
44
44
V
CC
= MAX,
I
’LS241, ’LS244
’LS240
46
46
mA
CC
Output open
50
50
Outputs disabled
’LS241, ’LS244
54
54
†
‡
§
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
All typical values are at V = 5 V, T = 25°C.
Not more than one output should be shorted at a time, and duration of the short-circuit should not exceed one second.
CC
A
switching characteristics, V
= 5 V, T = 25°C (see Figure 1)
CC
A
’LS240
TYP
9
’LS241, ’LS244
PARAMETER
TEST CONDITIONS
MIN
UNIT
ns
MAX
14
MIN
TYP
12
MAX
t
t
t
t
t
t
18
18
30
23
20
25
PLH
PHL
PZL
PZH
PLZ
PHZ
R
R
R
= 667 Ω,
= 667 Ω,
= 667 Ω,
C
C
= 45 pF
= 45 pF
= 5 pF
L
L
L
L
L
12
18
12
20
30
20
ns
15
23
15
10
20
10
ns
C
L
15
25
15
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
