Page 1
SN54/74LS125A
QUAD 3-STATE BUFFERS
V
E DOE DO
CC
14 13 12 11 10 9
123456
DOE
LS125A
EDOEDO
V
CC
14 13 12 11 10 9
123456
LS126A
DOE
DOED OE
8
7
GND
8
7
GND
SN54/74LS126A
QUAD 3-STATE BUFFERS
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
14
1
14
1
14
1
CASE 632-08
N SUFFIX
PLASTIC
CASE 646-06
D SUFFIX
SOIC
CASE 751A-02
TRUTH TABLES
LS125A LS126A
INPUTS INPUTS
E D OUTPUT E D OUTPUT
L L L H L L
L H H H H H
H X (Z) L X (Z)
L = LOW Voltage Level
H = HIGH Voltage Level
X = Don’t Care
(Z) = High Impedance (off)
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V
T
I
I
CC
A
OH
OL
Supply Voltage 54
74
Operating Ambient Temperature Range 54
74
Output Current — High 54
74
Output Current — Low 54
74
4.5
4.75
–55
0
5.0
5.0
25
25
5.5
5.25
125
70
–1.0
–2.6
12
24
V
°C
mA
mA
FAST AND LS TTL DAT A
5-1
Page 2
SN54/74LS125A • SN54/74LS126A
VILI
LOW Volt
V
pg
VOHOutput HIGH Volt
CC
,
OH
,
IN IH
VOLOutput LOW Volt
V
V
V
IIHI
HIGH C
t
ICCP
t
A
V
MAX
pg y,
Fi
2
C
45 pF
t
p
Fi
5
L
t
p
Fi
5
t
p
Fi
5
C
F
t
p
FI
5
L
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter
V
IH
V
IK
I
OZH
I
OZL
I
IL
I
OS
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
Input HIGH Voltage 2.0 V
nput
Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
Output Off Current HIGH 20 µA VCC = MAX, V
Output Off Current LOW –20 µA VCC = MAX, V
nput
Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
Short Circuit Current (Note 1) –40 –225 mA VCC = MAX
ower Supply Curren
age
age
age
urren
54 0.7
74 0.8
54 2.4 V
74 2.4 V
54, 74 0.25 0.4 V IOL = 12 mA
74 0.35 0.5 V IOL = 24 mA
LS125A 20
LS126A 22
Min Typ Max
20 µA VCC = MAX, VIN = 2.7 V
0.1 mA VCC = MAX, VIN = 7.0 V
Unit Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
All Inputs
VCC = MIN, IOH = MAX, VIN = V
or VIL per Truth Table
m
CC
=
VCC = VCC MIN,
=
or
IN
IL
per Truth Table
= 2.4 V
OUT
= 0.4 V
OUT
VIN = 0 V, VE = 4.5 V
VIN = 0 V, VE = 0 V
IH
IH
AC CHARACTERISTICS (T
Symbol Parameter
t
PLH
t
PLH
t
PHL
t
PHL
PZH
PZL
PHZ
PLZ
Propagation Delay,
Data to Output
Output Enable Time
to HIGH Level
Output Enable Time
to LOW Level
Output Disable Time
from HIGH Level
Output Disable Time
from LOW Level
A
= 25°C)
Limits
Min Typ Max
LS125A 9.0 15
LS126A 9.0 15
LS125A 7.0 18
LS126A 8.0 18
LS125A 12 20
LS126A 16 25
LS125A 15 25
LS126A 21 35
LS125A 20
LS126A 25
LS125A 20
LS126A 25
Unit Test Conditions
ns
ns
ns
ns
ns
gure
gures 4,
gures 3,
gures 4,
gures 3,
VCC = 5.0 V
=
L
RL = 667 Ω
VCC = 5.0 V
= 5.0 p
L
RL = 667 Ω
FAST AND LS TTL DATA
5-2
Page 3
SN54/74LS125A • SN54/74LS126A
V
V
V
V
V
IN
OUT
E
E
OUT
1.3 V 1.3 V
t
PLH
1.3 V
Figure 1 Figure 2
1.3 V
t
PZL
1.3 V
1.3 V
0.5 V
Figure 3 Figure 4
t
PHL
1.3 V
t
PLZ
≈
1.3 V
V
OL
V
V
V
V
V
IN
OUT
E
E
OUT
1.3 V
1.3 V
t
PHL
1.3 V
t
PZH
1.3 V
t
PHZ
1.3 V
t
PLH
1.3 V
1.3 V
> V
OH
≈
0.5 V
1.3 V
V
CC
R
L
SW1
TO OUTPUT
UNDER TEST
5 k
C
L
Figure 5
SWITCH POSITIONS
SYMBOL SW1 SW2
t
PZH
t
PZL
t
PLZ
t
PHZ
Open Closed
Closed Open
Closed Closed
Closed Closed
Ω
SW2
FAST AND LS TTL DATA
5-3
Loading...