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
E
D
O
4
5
6
7
E
D
O
GND
LS125A
J SUFFIX CERAMIC CASE 632-08
VCC
E
D
O
E
D
O
14
13
12
11
10
9
8
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 5-1
SN54/74LS125A • SN54/74LS126A DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits S b l Symbol
Min
P Parameter
VIH
Input HIGH Voltage
VIL
Input LOW Voltage
VIK
Input Clamp Diode Voltage
VOH
Output HIGH Voltage
VOL
Output LOW Voltage
IOZH IOZL IIH
Input HIGH Current
IIL
Input LOW Current
IOS
Short Circuit Current (Note 1)
ICC
Power Supply Current
Typ
Max
2.0 54
0.7
74
0.8 – 0.65
– 1.5
U i Unit
T Test C Conditions di i
V
Guaranteed Input HIGH Voltage for All Inputs
V
Guaranteed Input p LOW Voltage g 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
– 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 S b l Symbol
tPLH tPHL
Typ
Max
LS125A
Min
9.0
15
LS126A
9.0
15
LS125A
7.0
18
LS126A
8.0
18
P Parameter
tPLH Propagation P p g i D Delay, l y, Data to Output
tPHL
U i Unit
ns
Output p Enable Time to HIGH Level
LS125A
12
20
tPZH
LS126A
16
25
Output p Enable Time to LOW Level
LS125A
15
25
tPZL
LS126A
21
35
Output p Disable Time from HIGH Level
LS125A
20
tPHZ
LS126A
25
Output p Disable Time from LOW Level
LS125A
20
tPLZ
LS126A
25
FAST AND LS TTL DATA 5-2
T Test C Conditions di i
Fi Figure 2
ns
Figures 4 4, 5
ns
Figures 3 3, 5
ns
Figures 4 4, 5
ns
FIgures 3 3, 5
VCC = 5.0 50V CL = 45 pF RL = 667 Ω
VCC = 5.0 50V CL = 5.0 5 0 pF RL = 667 Ω
SN54/74LS125A • SN54/74LS126A VIN
VOUT
1.3 V
VIN
1.3 V tPLH
tPHL
1.3 V
1.3 V
1.3 V
1.3 V tPHL
VOUT
1.3 V
Figure 1
1.3 V
Figure 2
VE
VE 1.3 V
1.3 V
1.3 V
VE
1.3 V
VE tPZL
VOUT
tPLH
tPLZ ≈ 1.3 V
1.3 V
tPHZ
tPZH 1.3 V
VOUT
VOL
0.5 V
0.5 V
Figure 3
Figure 4
VCC RL
SW1
TO OUTPUT UNDER TEST
5 kΩ CL
SW2
Figure 5 SWITCH POSITIONS SYMBOL
SW1
SW2
tPZH
Open
Closed
tPZL
Closed
Open
tPLZ
Closed
Closed
tPHZ
Closed
Closed
FAST AND LS TTL DATA 5-3
> VOH ≈ 1.3 V