SN74BCT2953

OCTAL BUS TRANSCEIVER AND REGISTER

WITH 3STATE OUTPUTS

SCBS105B − DECEMBER 1990 − REVISED NOVEMBER 1993

2−3

POST OFFICE BOX 655303

POST OFFICE BOX 1443

recommended operating conditions (see Note 2)

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5.5

V

VIH

High-level input voltage

2

V

VIL

Low-level input voltage

0.8

V

IIK

Input clamp current

−18

mA

IOH

High-level output current

A ports

−3

mA

IOH

High-level output current

B ports

−15

mA

IOL

Low-level output current

A ports

24

mA

IOL

Low-level output current

B ports

64

mA

TA

Operating free-air temperature

0

70

°C

NOTE 2: Unused or floating pins (input or I/O) must be held high or low.

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

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VIK

VCC = 4.5 V,

II = − 18 mA

−1.2

V

A port

VCC = 4.5 V

IOH = − 1 mA

2.5

3.4

A port

VCC = 4.5 V

IOH = − 3 mA

2.4

3.3

VOH

IOH = − 3 mA

2.4

3.3

V

VOH

B port

VCC = 4.5 V

IOH = − 12 mA

3.2

V

B port

VCC = 4.5 V

IOH = − 15 mA

2

3.1

VOL

A port

VCC = 4.5 V

IOL = 24 mA

0.35

0.5

V

VOL

B port

VCC = 4.5 V

IOL = 64 mA

0.42

0.55

V

II‡

Control inputs

VCC = 5.5 V,

VI = 5.5 V

1

mA

II‡

A or B ports

VCC = 5.5 V,

VI = 5.5 V

0.1

mA

IIH‡

Control inputs

VCC = 5.5 V,

VI = 2.7 V

70

A

IIH‡

A or B ports

VCC = 5.5 V,

VI = 2.7 V

20

µA

IIL‡

Control inputs

VCC = 5.5 V,

VI = 0.5 V

−70

A

IIL‡

A or B ports

VCC = 5.5 V,

VI = 0.5 V

−20

µA

IOS§

Any A

VCC = 5.5 V,

VO = 0

−60

−150

mA

IOS§

Any B

VCC = 5.5 V,

VO = 0

−100

−250

mA

ICCH¶

VCC = 5.5 V

2

5

mA

ICCL¶

VCC = 5.5 V

38

55

mA

ICCZ

VCC = 5.5 V

2

5

mA

Ci

Control inputs

VCC = 5 V,

VI = 2.5 V or 0.5 V

6

pF

Cio

A or B ports

VCC = 5 V,

VO = 2.5 V or 0.5 V

12.5

pF

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

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

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

¶ ICCH and ICCL are measured in the A-to-B mode.