74LVC241A datasheet(6/10 Pages) PHILIPS

6 / 10 page

Philips Semiconductors

Product specification

74LVC241A

Octal buffer/line driver with 5-volt tolerant

inputs/outputs (3-State)

1998 May 20

AC WAVEFORMS

VM = 1.5 V at VCC ≥ 2.7 V

VM = 0.5 × VCC at VCC < 2.7 V

Vx = VOL + 0.3 V at VCC ≥ 2.7 V

Vx = VOL + 0.1 V × VCC at VCC < 2.7 V

VY = VOH – 0.3 V at VCC ≥ 2.7 V

VY = VOH – 0.1 × VCC at VCC < 2.7 V

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

output load.

SV00617

1An, 2An

INPUTS

1Yn, 2Yn

OUTPUT

tPLH

tPHL

GND

VOL

VOH

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

delays.

SV00618

outputs

disabled

outputs

enabled

outputs

enabled

tPHZ

tPZH

tPZL

tPLZ

HIGH-to-OFF

OFF-to-HIGH

LOW-to-OFF

OFF-to-LOW

1OE INPUT

VOL

VOH OUTPUT

GND

VCC OUTPUT

Figure 2. 3-state enable and disable times for input 1OE.

SV00619

outputs

disabled

outputs

enabled

outputs

enabled

tPHZ

tPZH

tPZL

tPLZ

HIGH-to-OFF

OFF-to-HIGH

LOW-to-OFF

OFF-to-LOW

2OE INPUT

VOL

VOH OUTPUT

GND

VCC OUTPUT

Figure 3. 3-state enable and disable times for input 2OE.

TEST CIRCUIT

PULSE

GENERATOR

D.U.T.

50pF

2 x VCC

Open

GND

500

Ω

500

Ω

VCC

t 2.7V

VCC

2.7V – 3.6V

2.7V

Test

GND

tPLZ/tPZL

2 x VCC

tPHZ/tPZH

tPLH/tPHL

Open

SY00003

VCC

Figure 4. Load circuitry for switching times.

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