Datasheet
SN54125, SN54126, SN54LS125A, SN54LS126A,
SN74125, SN74126, SN74LS125A, SN74LS126A
QUADRUPLE BUS BUFFERS WITH 3-STATE OUTPUTS
SDLS044A – DECEMBER 1983 – REVISED MARCH 2002
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
SN54125
SN54126
SN74125
SN74126
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 0.8 0.8 V
I
OH
High-level output current –2 –5.2 mA
I
OL
Low-level output current 16 16 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
†
SN54125
SN54126
SN74125
SN74126
UNIT
TEST
CONDITIONS
MIN TYP
‡
MAX MIN TYP
‡
MAX
V
IK
V
CC
= MIN, I
I
= –12 mA –1.5 –1.5 V
V
OH
V
CC
= MIN, V
IH
= 2 V, I
OH
= –2 mA 2.4 3.3
V
V
OH
V
IL
= 0.8 V I
OH
= –5.2 mA 2.4 3.1
V
V
OL
V
CC
= MIN, V
IH
= 2 V, V
IL
= 0.8 V,
04
04
V
V
OL
I
OL
= 16 mA
0
.
4
0
.
4
V
I
V
CC
= MAX V
IH
= 2 V, V
O
= 2.4 V 40 40
µA
I
OZ
V
IL
= 0.8 V V
O
= 0.4 V –40 –40
µ
A
I
I
V
CC
= MAX, V
I
= 6.5 V 1 1 mA
I
IH
V
CC
= MAX, V
I
= 2.4 V 40 40 µA
I
IL
V
CC
= MAX, V
I
= 0.4 V –1.6 –1.6 mA
I
OS
§
V
CC
= MAX –30 –70 –28 –70 mA
I
CC
V
CC
= MAX
’125 32 54 32 54
mA
I
CC
CC
(see Note 3)
’126 36 62 36 62
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.
NOTE 3: Data inputs = 0 V; output control = 4.5 V for ’125 and 0 V for ’126.
switching characteristics, V
CC
= 5 V, T
A
= 25°C (see Figure 1)
PARAMETER TEST CONDITIONS
SN54125
SN74125
SN54126
SN74126
UNIT
PARAMETER
TEST
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
t
PLH
R
L
= 400 Ω
C
L
=50
p
F
8 13 8 13
ns
t
PHL
R
L
=
400
Ω
,
C
L
=
50
F
12 18 12 18
ns
t
PZH
R
L
= 400 Ω
C
L
=50
p
F
11 17 11 18
ns
t
PZL
R
L
=
400
Ω
,
C
L
=
50
F
16 25 16 25
ns
t
PHZ
R
L
= 400 Ω
C
L
=5
p
F
5 8 10 16
ns
t
PLZ
R
L
=
400
Ω
,
C
L
=
5
F
7 12 12 18
ns
The SN54125, SN54126, SN74125,
SN74126, and SN54LS126A are
obsolete and are no longer supplied
.