74LVC623A データシートの表示（PDF） - Philips Electronics

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74LVC623A

Octal transceiver with dual enable (3-State)

Philips Electronics 

Philips Semiconductors

Octal transceiver with dual enable (3-State)

Product specification

74LVC623A

AC WAVEFORMS

VM = 1.5V at VCC w 2.7V

VM = 0.5V * VCC at VCC t 2.7V

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

output load.

VX = VOL at 0.3V w 2.7V

VX = VOL + 0.1VCC at VCC < 2.7V

VY = VOH – 0.3V at VCC w 2.7V

VY = VOH – 0.1VCC at VCC < 2.7V

VI

An, Bn

INPUT

GND

VOH

An, Bn

OUTPUT

VM

tPHL

VM

tPLH

VOL

SV00747

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

VI

OEBA

INPUT

VM

GND

VCC

OUTPUT

LOW-to-OFF

OFF-to-LOW

VOL

tPLZ

VX

tPZL

VM

VOH

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

GND

tPHZ

outputs

enabled

tPZH

VY

outputs

disabled

VM

outputs

enabled

SV00748

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

VI

OEAB

INPUT

VM

GND

VCC

OUTPUT

LOW-to-OFF

OFF-to-LOW

VOL

tPLZ

VX

tPZL

VM

VOH

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

GND

tPHZ

outputs

enabled

tPZH

VY

outputs

disabled

VM

outputs

enabled

SV00749

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

TEST CIRCUIT

VI

PULSE

GENERATOR

VCC

D.U.T.

RT

VO

CL 50pF

S1

500Ω

2 x VCC

Open

GND

500Ω

VCC

t 2.7V

2.7V – 3.6V

VI

VCC

2.7V

Test

tPLH/tPHL

tPLZ/tPZL

tPHZ/tPZH

S1

Open

2 x VCC

GND

SY00003

Figure 4. Load circuitry for switching times

1998 Jul 29

6

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