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 k
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)
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
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
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.