74125 ls

Page 1

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


Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.