Philips Semiconductors

Product specification

74LVC623A

Octal transceiver with dual enable (3-State)

1998 Jul 29

6

AC WAVEFORMS

output load.

INPUT

tPHL

tPLH

GND

OUTPUT

SV00747

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

OEBA

INPUT

GND

OUTPUT

LOW-to-OFF

OFF-to-LOW

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

GND

outputs

enabled

outputs

enabled

outputs

disabled

SV00748

Figure 2. 3-State enable and disable times for OEBA input

OEAB

INPUT

GND

OUTPUT

LOW-to-OFF

OFF-to-LOW

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

GND

outputs

enabled

outputs

enabled

outputs

disabled

SV00749

Figure 3. 3-State enable and disable times for OEAB input

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 4. Load circuitry for switching times