SN54LS245, SN74LS245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002

4

POST OFFICE BOX 655303

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS†

SN54LS245

SN74LS245

UNIT

PARAMETER

TEST CONDITIONS†

MIN

TYP‡

MAX

MIN

TYP‡

MAX

UNIT

VIH

High-level input voltage

2

2

V

VIL

Low-level input voltage

0.7

0.8

V

VIK

Input clamp voltage

VCC = MIN,

II = –18 mA

–1.5

–1.5

V

Hysteresis (VT+ – VT–)

A or B

VCC = MIN

0.2

0.4

0.2

0.4

V

VOH

High level output voltage

VCC = MIN,

VIH 2V

IOH = –3 mA

2.4

3.4

2.4

3.4

V

VOH

High-level output voltage

VIH = 2 V,

VIL = VIL(max)

IOH = MAX

2

2

V

VOL

Low level output voltage

VCC = MIN,

VIH 2V

IOL = 12 mA

0.4

0.4

V

VOL

Low-level output voltage

VIH = 2 V,

VIL = VIL(max)

IOL = 24 mA

0.5

V

IOZH

Off-state output current,

high-level voltage applied

VCC = MAX,

OE at 2 V

VO = 2.7 V

20

20

µA

IOZL

Off-state output current,

low-level voltage applied

VCC = MAX,

OE at 2 V

VO = 0.4 V

–200

–200

µA

II

Input current at

maximum input

A or B

VCC = MAX

VI = 5.5 V

0.1

0.1

mA

II

maximum input

voltage

DIR or OE

VCC = MAX

VI = 7 V

0.1

0.1

mA

IIH

High-level input current

VCC = MAX,

VIH = 2.7 V

20

20

µA

IIL

Low-level input current

VCC = MAX,

VIL = 0.4 V

–0.2

–0.2

mA

IOS

Short-circuit output current§

VCC = MAX

–40

–225

40

–225

mA

Total, outputs high

48

70

48

70

ICC

Supply current

Total, outputs low

VCC = MAX

Outputs open

62

90

62

90

mA

Outputs at high Z

64

95

64

95

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

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

§ Not more than one output should be shorted at a time, and duration of the short circuit should not exceed one second.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

tPLH

Propagation delay time, low- to high-level output

C45 pF

R

667

W

8

12

ns

tPHL

Propagation delay time high to low level output

CL = 45 pF,

RL = 667 W

8

12

ns

tPHL

Propagation delay time, high- to low-level output

8

12

tPZL

Output enable time to low level

CL =45 pF

RL = 667 W

27

40

ns

tPZH

Output enable time to high level

CL = 45 pF,

RL = 667 W

25

40

ns

tPLZ

Output disable time from low level

CL =5 pF

RL = 667 W

15

25

ns

tPHZ

Output disable time from high level

CL = 5 pF,

RL = 667 W

15

28

ns