Datasheet

SN54125, SN54126, SN54LS125A, SN54LS126A,
SN74125, SN74126, SN74LS125A, SN74LS126A
QUADRUPLE BUS BUFFERS WITH 3-STATE OUTPUTS
SDLS044A – DECEMBER 1983 – REVISED MARCH 2002
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
SN54LS125A
SN54LS126A
SN74LS125A
SN74LS126A
UNIT
MIN NOM MAX MIN NOM MAX
V
CC
Supply voltage 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 0.7 0.8 V
I
OH
High-level output current –1 –2.6 mA
I
OL
Low-level output current 12 24 mA
T
A
Operating free-air temperature –55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
†
SN54LS125A
SN54LS126A
SN74LS125A
SN74LS126A
UNIT
TEST
CONDITIONS
MIN TYP
‡
MAX MIN TYP
‡
MAX
V
IK
V
CC
= MIN, I
I
= –18 mA –1.5 –1.5 V
V
OH
V
CC
= MIN, V
IL
= 0.7 V, I
OH
= –1 mA 2.4
V
V
OH
V
IH
= 2 V V
IL
= 0.8 V I
OH
= –2.6 mA 2.4
V
V MIN
V
IL
= 0.7 V, I
OL
= 12 mA 0.25 0.4
V
OL
V
CC
= MIN,
V
IH
=2V
V
IL
= 0.8 V, I
OL
= 12 mA 0.25 0.4
V
V
IH
=
2
V
V
IL
= 0.8 V, I
OL
= 24 mA 0.35 0.5
V
IL
=07V
V
O
= 2.4 V 20
I
V
CC
= MAX,
V
IL
=
0
.
7
V
V
O
= 0.4 V –20
µA
I
OZ
CC
,
V
IH
= 2 V,
V
IL
=08V
V
O
= 2.4 V 20
µ
A
V
IL
=
0
.
8
V
V
O
= 0.4 V –20
I
I
V
CC
= MAX, V
I
= 7 V 0.1 0.1 mA
I
IH
V
CC
= MAX, V
I
= 2.7 V 20 20 µA
I
IL
V
CC
= MAX, ’LS125A-G inputs –0.2 –0.2 mA
I
IL
V
I
= 0.4 V ’LS125A-A inputs; ’LS126A All inputs –0.4 –0.4 mA
I
OS
§
V
CC
= MAX –40 –225 –40 –225 mA
I
CC
V
CC
= MAX
’LS125A 11 20 11 20
mA
I
CC
CC
(see Note 4)
’LS126A 12 22 12 22
mA
†
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 the duration of the short circuit should not exceed one second.
NOTE 4: Data inputs = 0 V; output control = 4.5 V for ’LS125A and 0 V for ’LS126A.
switching characteristics, V
CC
= 5 V, T
A
= 25°C (see Figure 1)
PARAMETER TEST CONDITIONS
SN54LS125A
SN74LS125A
SN54LS126A
SN74LS126A
UNIT
PARAMETER
TEST
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
t
PLH
R
L
= 667 Ω
C
L
=45
p
F
9 15 9 15
ns
t
PHL
R
L
=
667
Ω
,
C
L
=
45
F
7 18 8 18
ns
t
PZH
R
L
= 667 Ω
C
L
=45
p
F
12 20 16 25
ns
t
PZL
R
L
=
667
Ω
,
C
L
=
45
F
15 25 21 35
ns
t
PHZ
R
L
= 667 Ω
C
L
=5
p
F
20 25
ns
t
PLZ
R
L
=
667
Ω
,
C
L
=
5
F
20 25
ns
The SN54125, SN54126, SN74125,
SN74126, and SN54LS126A are
obsolete and are no longer supplied
.