LTC490IS8 Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Lista de partido

LTC490IS8

Differential Driver and Receiver Pair

Linear Technology 

PI FU CTIO S

VCC (Pin 1): Positive Supply; 4.75V ≤ VCC ≤ 5.25V.

R (Pin 2): Receiver Output. If A > B by 200mV, R will be

high. If A < B by 200mV, then R will be low.

D (Pin 3): Driver Input. A low on D forces the driver outputs

Y low and Z high. A high on D will force Y high and Z low.

GND (Pin 4): Ground Connection.

Y (Pin 5): Driver Output.

Z (Pin 6): Driver Output.

B (Pin 7): Receiver Input.

A (Pin 8): Receiver Input.

LTC490

TEST CIRCUITS

Y

VOD2

Z

R

R

VOC

LTC490 • F01

Figure 1. Driver DC Test Load

Y

D

DRIVER

RDIFF

Z

CL1 A

RECEIVER

CL2 B

R

15pF

LTC490 • F02

Figure 2. Driver/Receiver Timing Test Circuit

UW

W

SWITCHI G TI E WAVEFOR S

3V

D

0V

VO

–VO

Z

VO

Y

1.5V

tPLH

50%

10%

tr

1/2 VO

80%

tSKEW

f = 1MHz : tr ≤ 10ns : tf ≤ 10ns

VDIFF = V(Y) – V(Z)

1.5V

tPHL

90%

50%

20%

tf

1/2 VO

tSKEW

Figure 3. Driver Propagation Delays

LTC490 • F03

VOD2

A-B

–VOD2

VOH

R

VOL

0V

tPLH

1.5V

INPUT

f = 1MHz ; tr ≤ 10ns : tf ≤ 10ns

OUTPUT

Figure 4. Receiver Propagation Delays

0V

tPHL

1.5V

LTC490 • F04

490fb

5

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