SN54ALS646, SN54ALS648, SN54AS646

SN74ALS646A, SN74ALS648A, SN74AS646, SN74AS648

OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SDAS039F – DECEMBER 1983 – REVISED JANUARY 1995

13

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

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

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54AS646

SN74AS646

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

V

IOH = – 15 mA

2

VOL

VCC =4 5V

IOL = 32 mA

0.25

0.5

V

VOL

VCC = 4.5 V

IOL = 48 mA

0.35

0.5

V

II

Control inputs

VCC = 5.5 V,

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

I

Control inputs

V5 5 V

V2 7 V

20

20

A

IIH

A or B ports‡

VCC = 5.5 V,

VI = 2.7 V

70

70

µA

I

Control input

V5 5 V

V0 4 V

– 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

–30

–112

–30

–112

mA

Outputs high

120

195

120

195

ICC

VCC = 5.5 V

Outputs low

130

211

130

211

mA

Outputs disabled

130

211

130

211

† 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.