SN54/74LS125A
SN54/74LS126A
QUAD 3-STATE BUFFERS
VCC
E
D
O
E
D
O
14
13
12
11
10
9
8
QUAD 3-STATE BUFFERS
LOW POWER SCHOTTKY
1
2
3
4
5
6
7
E
D
O
E
D
O
GND
LS125A
VCC
E
D
O
E
D
O
14
13
12
11
10
9
8
J SUFFIX
CERAMIC
CASE 632-08
14
1
N SUFFIX
PLASTIC
CASE 646-06
14
1
1
2
3
4
5
6
7
E
D
O
E
D
O
GND
LS126A
14
1
D SUFFIX
SOIC
CASE 751A-02
TRUTH TABLES
LS125A
LS126A
INPUTS
ORDERING INFORMATION
INPUTS
E
D
OUTPUT
E
D
OUTPUT
L
L
H
L
H
X
L
H
(Z)
H
H
L
L
H
X
L
H
(Z)
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
L = LOW Voltage Level
H = HIGH Voltage Level
X = Don’t Care
(Z) = High Impedance (off)
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
TA
Operating Ambient Temperature Range
54
74
– 55
0
25
25
125
70
°C
IOH
Output Current — High
54
74
– 1.0
– 2.6
mA
IOL
Output Current — Low
54
74
12
24
mA
FAST AND LS TTL DATA
5-207
SN54/74LS125A • SN54/74LS126A
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Min
Parameter
VIH
Input HIGH Voltage
VIL
Input LOW Voltage
VIK
Input Clamp Diode Voltage
VOH
Output HIGH Voltage
VOL
Output LOW Voltage
IOZH
IOZL
Typ
Max
2.0
54
0.7
74
0.8
– 0.65
– 1.5
Unit
Test Conditions
V
Guaranteed Input HIGH Voltage for
All Inputs
V
Guaranteed Input LOW Voltage for
All Inputs
V
VCC = MIN, IIN = – 18 mA
54
2.4
V
74
2.4
V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
54, 74
0.25
0.4
V
IOL = 12 mA
74
0.35
0.5
V
IOL = 24 mA
Output Off Current HIGH
20
µA
VCC = MAX, VOUT = 2.4 V
Output Off Current LOW
– 20
µA
VCC = MAX, VOUT = 0.4 V
20
µA
VCC = MAX, VIN = 2.7 V
0.1
mA
VCC = MAX, VIN = 7.0 V
– 0.4
mA
VCC = MAX, VIN = 0.4 V
–225
mA
VCC = MAX
mA
VCC = MAX
IIH
Input HIGH Current
IIL
Input LOW Current
IOS
Short Circuit Current (Note 1)
ICC
Power Supply Current
– 40
LS125A
20
LS126A
22
VIN = 0 V, VE = 4.5 V
VIN = 0 V, VE = 0 V
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25°C)
Limits
Symbol
tPLH
tPHL
Typ
Max
LS125A
Min
9.0
15
LS126A
9.0
15
LS125A
7.0
18
LS126A
8.0
18
Parameter
tPLH
Propagation Delay,
Data to Output
tPHL
Unit
ns
Output Enable Time
to HIGH Level
LS125A
12
20
tPZH
LS126A
16
25
Output Enable Time
to LOW Level
LS125A
15
25
tPZL
LS126A
21
35
Output Disable Time
from HIGH Level
LS125A
20
tPHZ
LS126A
25
Output Disable Time
from LOW Level
LS125A
20
tPLZ
LS126A
25
FAST AND LS TTL DATA
5-208
Test Conditions
Figure 2
ns
Figures 4, 5
ns
Figures 3, 5
ns
Figures 4, 5
ns
FIgures 3, 5
VCC = 5.0 V
CL = 45 pF
RL = 667 Ω
VCC = 5.0 V
CL = 5.0 pF
RL = 667 Ω
SN54/74LS125A • SN54/74LS126A
Figure 1
Figure 2
≈ Figure 3
Figure 4
Ω
Figure 5
SWITCH POSITIONS
SYMBOL
SW1
SW2
tPZH
Open
Closed
tPZL
Closed
Open
tPLZ
Closed
Closed
tPHZ
Closed
Closed
FAST AND LS TTL DATA
5-209
≈ Case 751A-02 D Suffix
14-Pin Plastic
SO-14
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14-Pin Ceramic Dual In-Line
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14-Pin Plastic
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FAST AND LS TTL DATA
5-210
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#
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◊
FAST AND LS TTL DATA
5-211