74F1244 datasheet(4/8 Pages) PHILIPS

4 / 8 page

Philips Semiconductors

Product specification

74F1244

Octal buffer (3-State)

1989 Apr 04

DC ELECTRICAL CHARACTERISTICS

(Over recommended operating free-air temperature range unless otherwise noted.)

SYMBOL

PARAMETER

TEST CONDITIONS1

LIMITS

UNIT

SYMBOL

PARAMETER

TEST CONDITIONS1

MIN

TYP2

MAX

UNIT

IO = 3mA

±10% VCC

2.5

High level output voltage

VCC = MIN,

VIL = MAX

IOH = –3mA

±5% VCC

2.7

3.4

VOH

High-level output voltage

VIL = MAX,

VIH = MIN

IO = 15mA

±10% VCC

2.0

IOH = –15mA

±5% VCC

2.0

Low level output voltage

VCC = MIN,

VIL = MAX

IOL = 48mA

±10% VCC

0.38

0.55

VOL

Low-level output voltage

VIL = MAX,

VIH = MIN

IOL = 64mA

±5% VCC

0.42

0.55

VIK

Input clamp voltage

VCC = MIN, II = IIK

–0.73

–1.2

Input current at maximum input voltage

VCC = 0.0V, VI = 7.0V

100

µA

IIH

High-level input current

VCC = MAX, VI = 2.7V

µA

IIL

Low-level input current

VCC = MAX, VI = 0.5V

–20

µA

IOZH

Off-state output current,

High-level voltage applied

VCC = MAX, VO = 2.7V

µA

IOZL

Off-state output current,

Low-level voltage applied

VCC = MAX, VO = 0.5V

–50

µA

IOS

Short-circuit output current3

VCC = MAX

–100

–225

ICCH

ICC

Supply current (total)

ICCL

VCC = MAX

ICCZ

NOTES:

1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.

2. All typical values are at VCC = 5V, Tamb = 25°C.

3. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold

techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting

of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any

sequence of parameter tests, IOS tests should be performed last.

AC ELECTRICAL CHARACTERISTICS

LIMITS

SYMBOL

PARAMETER

TEST

CONDITION

Tamb = +25°C

VCC = +5.0V

CL = 50pF, RL = 500Ω

Tamb = 0°C to +70°C

VCC = +5.0V ± 10%

CL = 50pF, RL = 500Ω

UNIT

MIN

TYP

MAX

MIN

MAX

tPLH

tPHL

Propagation delay

Ian, Ibn to Yn

Waveform 1

2.5

2.0

4.0

5.0

5.5

7.0

2.5

2.0

6.0

7.5

tPZH

tPZL

Output Enable time

to High or Low level

Waveform 2

Waveform 3

3.0

6.0

6.5

7.5

8.0

3.0

8.5

tPHZ

tPLZ

Output Disable time

to High or Low level

Waveform 2

Waveform 3

2.0

4.0

5.5

2.0

6.0

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