SN54ACT244, SN74ACT244

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SCAS517B – JUNE 1995 – REVISED MAY 1996

3

POST OFFICE BOX 655303

recommended operating conditions (see Note 3)

SN54ACT244

SN74ACT244

UNIT

MIN

MAX

MIN

MAX

UNIT

VCC

Supply voltage

4.5

5.5

4.5

5.5

V

VIH

High-level input voltage

2

2

V

VIL

Low-level input voltage

0.8

0.8

V

VI

Input voltage

0

VCC

0

VCC

V

VO

Output voltage

0

VCC

0

VCC

V

IOH

High-level output current

–24

–24

mA

IOL

Low-level output current

24

24

mA

∆t/∆v

Input transition rise or fall rate

0

8

0

8

ns/V

TA

Operating free-air temperature

–55

125

–40

85

°C

NOTE 3: Unused inputs must be held high or low to prevent them from floating.

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

otherwise noted)

PARAMETER

TEST CONDITIONS

VCC

TA = 25°C

SN54ACT244

SN74ACT244

UNIT

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

IOH =50 µA

4.5 V

4.4

4.49

4.4

4.4

IOH = – 50 µA

5.5 V

5.4

5.49

5.4

5.4

VOH

I24

A

4.5 V

3.86

3.7

3.76

V

VOH

IOL = – 24 mA

5.5 V

4.86

4.7

4.76

V

IOH = – 50 mA†

5.5 V

3.85

IOH = –75 mA†

5.5 V

3.85

IOL =50 µA

4.5 V

0.001

0.1

0.1

0.1

IOL = 50 µA

5.5 V

0.001

0.1

0.1

0.1

VOL

IOL =24mA

4.5 V

0.36

0.5

0.44

V

VOL

IOL = 24 mA

5.5 V

0.36

0.5

0.44

V

IOL = 50 mA†

5.5 V

1.65

IOL = 75 mA†

5.5 V

1.65

IOZ

VO = VCC or GND

5.5 V

±0.25

±5

±2.5

µA

II

VI = VCC or GND

5.5 V

±0.1

±1

±1

µA

ICC

VI = VCC or GND,

IO = 0

5.5 V

4

80

40

µA

∆ICC‡

One input at 3.4 V,

Other inputs at GND or VCC

5.5 V

0.6

1.6

1.5

mA

Ci

VI = VCC or GND

5 V

2.5

pF

Co

VI = VCC or GND

5 V

8

pF

† Not more than one output should be tested at a time, and the duration of the test should not exceed 2 ms.

‡ This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or VCC.