74ALVCH16540 データシートの表示（PDF） - Philips Electronics

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74ALVCH16540

2.5V/3.3V 16-bit buffer/line driver, inverting, 5V input tolerant (3-State)

Philips Electronics 

Philips Semiconductors

16-bit buffer/line driver, inverting,

5V input tolerant (3-State)

Product specification

74ALVCH16540

TEST CIRCUIT

VCC

PULSE

GENERATOR

VIN

RT

D.U.T.

VOUT

CL

S1

2<VCC

Open

GND

RL=500 Ω

RL=500 Ω

Test Circuit for 3-State Outputs

SWITCH POSITION

TEST

tPLH/tPHL

tPLZ/tPZL

tPHZ/tPZH

SWITCH

Open

2<VCC

GND

VCC

t 2.7V

2.7 – 3.6V

VIN

VCC

2.7V

DEFINITIONS

RL = Load resistor

CL = Load capacitance includes jig and probe capacitance

RT = Termination resistance should be equal to ZOUT

of pulse generators.

SW00047

Waveform 3. Load circuitry for switching times

AC WAVEFORMS FOR VCC = 2.3V TO 2.7V AND VCC < 2.3V RANGE

VM = 0.5 * VCC

VX = VOL + 0.15V

VI

VY = VOH –0.15V

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

output load.

OE INPUT

VM

VI = VCC

GND

VI

nAn

INPUT

VM

GND

VOH

tPHL

tPLH

nYn

OUTPUT

VM

VOL

SW00111

Waveform 4. Input (An) to output (Yn) propagation delay times

VCC

Y OUTPUT

LOW-to-OFF

OFF-to-LOW

VOL

VOH

Y OUTPUT

HIGH-to-OFF

OFF-to-HIGH

GND

tPLZ

tPZL

VM

VX

tPHZ

VY

tPZH

VM

outputs

enabled

outputs

disabled

outputs

enabled

SW00112

Waveform 5. 3-State enable and disable times

1997 Aug 11

7

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