SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDAS278 – JANUARY 1995

4

POST OFFICE BOX 655303

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I/O ports

5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

– 55

°C to 125°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74AS645

0

°C to 70°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range

– 65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

recommended operating conditions

SN54AS645

SN74AS645

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5.5

4.5

5

5.5

V

VIH

High-level input voltage

2

2

V

VIL

Low-level input voltage

0.8

0.8

V

IOH

High-level output current

–12

–15

mA

IOL

Low-level output current

48

64

mA

TA

Operating free-air temperature

–55

125

0

70

°C

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

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54AS645

SN74AS645

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP‡

MAX

MIN

TYP‡

MAX

UNIT

VIK

VCC = 4.5 V,

II = – 18 mA

– 1.2

– 1.2

V

VCC = 4.5 V to 5.5 V,

IOH = – 2 mA

VCC –2

VCC –2

VOH

IOH = – 3 mA

2.4

3.2

2.4

3.2

V

VOH

VCC = 4.5 V

IOH = – 12 mA

2.4

V

IOH = – 15 mA

2.4

VOL

VCC =4 5V

IOL = 48 mA

0.3

0.55

V

VOL

VCC = 4.5 V

IOL = 64 mA

0.35

0.55

V

II

Control inputs

VCC =5 5V

VI = 7 V

0.1

0.1

mA

II

A or B ports

VCC = 5.5 V

VI = 5.5 V

0.1

0.1

mA

IIH

Control inputs

VCC =5 5V

VI =2 7V

20

20

µA

IIH

A or B ports§

VCC = 5.5 V,

VI = 2.7 V

70

70

µA

IIL

Control inputs

VCC =5 5V

VI =0 4V

– 0.5

– 0.5

mA

IIL

A or B ports§

VCC = 5.5 V,

VI = 0.4 V

– 0.75

– 0.75

mA

IO¶

VCC = 5.5 V,

VO = 2.25 V

–50

– 150

–50

– 150

mA

Outputs high

62

97

62

97

ICC

VCC = 5.5 V

Outputs low

95

149

95

149

mA

Outputs disabled

79

123

79

123

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

§ For I/O ports, the parameters IIH and IIL include the off-state output current.

¶ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.