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74LS244

Octal Buffer / Line Driver with 3-State Outputs

ON Semiconductor 

SN74LS240 SN74LS244

AC WAVEFORMS

VIN

VOUT

1.3 V

tPLH

1.3 V

Figure 1.

1.3 V

tPHL

1.3 V

VIN

VOUT

1.3 V

tPHL

1.3 V

1.3 V

tPLH

1.3 V

Figure 2.

TO OUTPUT

UNDER TEST

VCC

RL

SW1

5 kΩ

CL*

SW2

VE

VE

VOUT

1.3 V

tPZL

1.3 V

Figure 3.

1.3 V

tPLZ

≈ 1.3 V

VOL

0.5 V

VE

VE

VOUT

1.3 V

tPZH

1.3 V

Figure 4.

1.3 V

tPHZ

≥VOH

≈ 1.3 V

0.5 V

SWITCH POSITIONS

SYMBOL

SW1

SW2

tPZH

tPZL

tPLZ

tPHZ

Open

Closed

Closed

Closed

Closed

Open

Closed

Closed

Figure 5.

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