ELECTRICAL CHARACTERISTICS

SWITCHING CHARACTERISTICS

SN54LS243, SN74LS243

SDLS145A – APRIL 1985 – REVISED JULY 2008 ............................................................................................................................................................. www.ti.com

over operating free-air temperature range (unless otherwise noted)

SN54LS243

SN74LS243

PARAMETER

TEST CONDITIONS(1)

UNIT

MIN

TYP(2)

MAX

MIN

TYP(2)

MAX

VIK

A or B

VCC = MIN,

II = –18 mA

–1.5

–1.5

V

Hysteresis (VT+ – VT–)

VCC = MIN,

0.2

0.4

0.2

0.4

V

VIL = MAX,

2.4

3.1

2.4

3.1

V

IOH = –3 mA

VOH

VCC = MIN,

VIH = 2 V,

VIL = 0.5 V,

2

2

IOH = MAX

VIH = 2 V,

IOL = 12 mA

0.25

0.4

0.25

0.4

VCC = MIN,

VOL

V

VIL = MAX

IOL = 24 mA

0.35

0.5

VCC = MIN,

VIH = 2 V,

VO = 2.7 V

IOZH

40

40

µA

VIL = MAX,

VCC = MIN,

VIH = 2 V,

VO = 0.4 V

IOZL

–200

–200

µA

VIL = MAX,

A or B

VI = 5.5 V

0.1

0.1

II

VCC = MAX,

mA

GAB or GBA

VI = 7 V

0.1

0.1

IIH

VCC = MAX,

20

20

µA

VCC = MAX, VI = 0.4 V,

A inputs

–0.2

–0.2

GAB and GBA at 0 V

IIL

VCC = MAX, VI = 0.4 V,

mA

B inputs

–0.2

–0.2

GAB and GBA at 4.5 V

GAB or GBA

VCC = MAX, VI = 0.4 V,

–0.2

–0.2

IOS

VCC = MAX

–40

–225

–40

–225

mA

Outputs high

22

38

22

38

Outputs low

VCC = MAX,

29

50

29

50

ICC

Outputs open,

mA

(3)

All outputs

32

54

32

54

disabled

(1)

For conditions shown as MIN or MAX, use the appropriate value specified under "recommended operating conditions."

(2)

All typical values are at VCC = 5 V, TA = 25°C.

(3)

ICC is measured with transceivers eabled in one direction only, or with all transceivers disabled.

VCC = 5 V, TA = 25°C

SN54LS243

SN74LS243

PARAMETER

TEST CONDITIONS

UNIT

MIN

TYP

MAX

MIN

TYP

MAX

tPLH

9

14

12

18

ns

tPHL

12

18

12

18

ns

RL = 667 Ω,

CL = 45 pF

tPZL

20

30

20

30

ns

tPZH

15

23

15

23

ns

tPLZ

10

20

10

20

ns

RL = 667 Ω,

CL = 5 pF

tPHZ

15

25

15

25

ns

4

Submit Documentation Feedback

Copyright © 1985–2008, Texas Instruments Incorporated

Product Folder Link(s): SN54LS243 SN74LS243