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
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
SN54S’ SN74S’
MIN NOM MAX MIN NOM MAX
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)
SN54S’ SN74S’
MIN TYP
‡
MAX MIN TYP
‡
MAX
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
Any A –400 –400 µA
IL
CC
=
,
I
=
.
Any G –2 –2 mA
I
OS
§
V
CC
= MAX –50 –225 –50 –225 mA
p
’S240 80 123 80 135
’S241,’S244 95 147 95 160
V
= MAX,
p
’S240 100 145 100 150
CC
Output open
’S241, ’S244 120 170 120 180
p
’S240 100 145 100 150
’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.
