Datasheet
SN54LS240, SN54LS241, SN54LS244, SN54S240, SN54S241, SN54S244
SN74LS240, SN74LS241, SN74LS244, SN74S240, SN74S241, SN74S244
OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS
SDLS144C − APRIL 1985 − REVISED MAY 2010
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
SN54S’ SN74S’
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage (see Note 1) 4.5 5 5.5 4.75 5 5.25 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.8 0.8 V
I
OH
High-level output current −12 −15 mA
I
OL
Low-level output current 48 64 mA
External resistance between any input and V
CC
or ground 40 40 kΩ
T
A
Operating free-air temperature (see Note 3) −55 125 0 70 °C
NOTES: 1. Voltage values are with respect to network ground terminal.
3. An SN54S241J operating at free-air temperature above 116°C requires a heat sink that provides a thermal resistance from case
to free air, R
θ
CA
, of not more that 40°C/W.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
†
SN54S’ SN74S’
UNIT
PARAMETER
TEST CONDITIONS
†
MIN TYP
‡
MAX MIN TYP
‡
MAX
UNIT
V
IK
V
CC
= MIN, I
I
= −18 mA −1.2 −1.2 V
Hysteresis
(V
T+
− V
T−
)
V
CC
= MIN 0.2 0.4 0.2 0.4 V
V
CC
= MIN
I
OH
= −1 mA
V
IH
= 2 V, V
IL
= 0.8 V,
2.7
V
OH
V
CC
= MIN,
I
OH
= −3 mA
V
IH
= 2 V, V
IL
= 0.8 V,
2.4 3.4 2.4 3.4
V
V
CC
= MIN,
I
OH
= MAX
V
IH
= 2 V, V
IL
= 0.5 V,
2 2
V
OL
V
CC
= MIN,
I
OL
= MAX
V
IH
= 2 V, V
IL
= 0.8 V,
0.55 0.55 V
I
OZH
V
CC
= MAX,
V
IL
= 0.8 V
V
IH
= 2 V,
V
O
= 2.4 V 50 50 µA
I
OZL
V
CC
= MAX,
V
IL
= 0.8 V
V
IH
= 2 V,
V
O
= 0.5 V −50 −50 µA
I
I
V
CC
= MAX, V
I
= 5.5 V 1 1 mA
I
IH
V
CC
= MAX, V
I
= 2.7 V 50 50 µA
I
V MAX
V 05V
Any A −400 −400 µA
I
IL
V
CC
= MAX, V
I
= 0.5 V
Any G
−2 −2 mA
I
OS
§
V
CC
= MAX −50 −225 −50 −225 mA
Outputs high
’S240 80 123 80 135
Outputs high
’S241,’S244 95 147 95 160
I
V
CC
= MAX,
Outputs low
’S240 100 145 100 150
mA
I
CC
V
CC
=
MAX
,
Output open
Outputs low
’S241, ’S244 120 170 120 180
mA
Outputs disabled
’S240 100 145 100 150
Outputs disabled
’S241, ’S244 120 170 120 180
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
‡
All typical values are at V
CC
= 5 V, T
A
= 25°C.
§
Not more than one output should be shorted at a time, and duration of the short-circuit should not exceed one second.