74LV244 datasheet(6/12 Pages) PHILIPS | Octal buffer/line driver 3-State

6 page

Philips Semiconductors

Product specification

74LV244

Octal buffer/line driver (3-State)

1998 May 20

AC CHARACTERISTICS

GND = 0V; tr = tf ≤ 2.5ns; CL = 50pF; RL =1KΩ

CONDITION

LIMITS

SYMBOL

PARAMETER

WAVEFORM

CONDITION

–40 to +85

°C

–40 to +125

°C

UNIT

VCC(V)

MIN

TYP1

MAX

MIN

MAX

1.2

Propagation delay

2.0

tPHL/tPLH

Pro agation delay

1An to 1Yn;

2A to 2Y

Figures 1, 2

2.7

2An to 2Yn

3.0 to 3.6

4.5 to 5.5

1.2

3-State output enable time

2.0

tPZH/tPZL

3-State out ut enable time

1OE to 1Yn;

2OE to 2Y

Figures 2, 3

2.7

2OE to 2Yn

3.0 to 3.6

122

4.5 to 5.5

1.2

3-State output disable time

2.0

tPHZ/tPLZ

3-State out ut disable time

1OE to 1Yn;

2OE to 2Y

Figures 2, 3

2.7

2OE to 2Yn

3.0 to 3.6

132

4.5 to 5.5

NOTES:

1. Unless otherwise stated, all typical values are measured at Tamb = 25°C.

2. Typical values are measured at VCC = 3.3 V.

AC WAVEFORMS

VM = 1.5 V at VCC ≥ 2.7 V and ≤ 3.6 V

VM = 0.5 × VCC at VCC < 2.7 V and ≥ 4.5 V

VOL and VOH are the typical output voltage drop that occur with the

output load.

VX = VOL + 0.3 V at VCC ≥ 2.7 V and ≤ 3.6 V

VX = VOL + 0.1 × VCC at VCC < 2.7 V and ≥ 4.5 V

VY = VOH – 0.3 V at VCC ≥ 2.7V and ≤ 3.6 V

VY = VOH – 0.1 × VCC at VCC < 2.7 V and ≥ 4.5 V

SV00617

1An, 2An

INPUTS

1Yn, 2Yn

OUTPUT

tPLH

tPHL

GND

VOL

VOH

Figure 1. Input (1An, 2An) to output (1Yn, 2Yn)

propagation delays.

SV00623

outputs

disabled

outputs

enabled

outputs

enabled

tPHZ

tPZH

tPZL

tPLZ

HIGH-to-OFF

OFF-to-HIGH

LOW-to-OFF

OFF-to-LOW

OE INPUT

VOL

VOH

GND

VCC

Qn OUTPUT

Figure 2. 3-State enable and disable times.

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