Philips Semiconductors

Product specification

74LVC544A

Octal D-type registered transceiver, inverting

(3-State)

1998 Jul 29

7

AC WAVEFORMS

output load.

INPUT

tPHL

tPLH

GND

OUTPUT

SV00737

Figure 1. Input (An, Bn) to output (Bn, An) propagation delays.

OUTPUT

GND

SV00738

Figure 2. Latch enable input (LEXX) pulse width, the latch

enable input to output (An, Bn) propagation delays.

INPUT

GND

OUTPUT

LOW-to-OFF

OFF-to-LOW

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

GND

outputs

enabled

outputs

enabled

outputs

disabled

SW00210

Figure 3. 3-State enable and disable times

INPUT

INPUT

th

NOTE: The shaded areas indicate when the input is permitted to change

for predictable output performance.

th

GND

GND

SV00739

Figure 4. Data set-up and hold times for the (An, Bn) input to

the LEXX and EXX inputs

TEST CIRCUIT

PULSE

GENERATOR

D.U.T.

50pF

Open

GND

500

Ω

500

Ω

t 2.7V

2.7V – 3.6V

2.7V

Test

GND

Open

SY00003

Figure 5. Load circuitry for switching times