SN54HC646, SN74HC646

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3-STATE OUTPUTS

SCLS150C – DECEMBER 1982 – REVISED MARCH 2003

5

POST OFFICE BOX 655303

recommended operating conditions (see Note 4)

SN54HC646

SN74HC646

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

VCC

Supply voltage

2

5

6

2

5

6

V

VCC = 2 V

1.5

1.5

VIH

High-level input voltage

VCC = 4.5 V

3.15

3.15

V

VCC = 6 V

4.2

4.2

VCC = 2 V

0.5

0.5

VIL

Low-level input voltage

VCC = 4.5 V

1.35

1.35

V

VCC = 6 V

1.8

1.8

VI

Input voltage

0

VCC

0

VCC

V

VO

Output voltage

0

VCC

0

VCC

V

VCC = 2 V

1000

1000

tt

Input transition (rise and fall) time

VCC = 4.5 V

500

500

ns

VCC = 6 V

400

400

TA

Operating free-air temperature

–55

125

–40

85

°C

NOTE 4: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,

Implications of Slow or Floating CMOS Inputs, literature number SCBA004.

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

otherwise noted)

PARAMETER

TEST CONDITIONS

VCC

TA = 25°C

SN54HC646

SN74HC646

UNIT

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

2 V

1.9

1.998

1.9

1.9

IOH = –20 µA

4.5 V

4.4

4.499

4.4

4.4

VOH

VI = VIH or VIL

6 V

5.9

5.999

5.9

5.9

V

IOH = –6 mA

4.5 V

3.98

4.3

3.7

3.84

IOH = –7.8 mA

6 V

5.48

5.8

5.2

5.34

2 V

0.002

0.1

0.1

0.1

IOL = 20 µA

4.5 V

0.001

0.1

0.1

0.1

VOL

VI = VIH or VIL

6 V

0.001

0.1

0.1

0.1

V

IOL = 6 mA

4.5 V

0.17

0.26

0.4

0.33

IOL = 7.8 mA

6 V

0.15

0.26

0.4

0.33

II

Control

inputs

VI = VCC or 0

6 V

±0.1

±100

±1000

±1000

nA

IOZ

A or B

VO = VCC or 0

6 V

±0.01

±0.5

±10

±5

µA

ICC

VI = VCC or 0,

IO = 0

6 V

8

160

80

µA

Ci

Control

inputs

2 V to 6 V

3

10

10

10

pF

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.