ISL33334E データシートの表示（PDF） - Renesas Electronics

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ISL33334E

3.3V, ±15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485) Transceivers

Renesas Electronics 

ISL33334E, ISL33337E

Test Circuits and Waveforms (Continued)

SIGNAL

GENERATOR

DE485

DI

Z

D

Y

CL

500?

VCC

SW GND

FOR SHDN TESTS, SWITCH SHDN RATHER THAN DE485

PARAMETER SHDN/DE485 OUTPUT DI

tHZ

1/-

tLZ

1/-

tZH

1/-

tZL

1/-

tZH(SHDN)

-/1

tZL(SHDN)

-/1

Y/Z 1/0

Y/Z 0/1

Y/Z 1/0

Y/Z 0/1

Y/Z 1/0

Y/Z 0/1

SW

GND

VCC

GND

VCC

GND

VCC

CL (pF)

15

15

100

100

100

100

DE485

(SHDN FOR SHDN)

tZH

tZH(SHDN)

OUT (Y, Z)

tZL

tZL(SHDN)

OUT (Y, Z)

ENABLED

50%

3V

50%

0V

tHZ

OUTPUT HIGH

2.3V

VOH - 0.5V VOH

0V

tLZ

2.3V

OUTPUT LOW

VCC

VOL + 0.5V VOL

FIGURE 4A. TEST CIRCUIT

FIGURE 4B. MEASUREMENT POINTS

FIGURE 4. RS-485 DRIVER ENABLE AND DISABLE TIMES

0V B

A

RE485

RO

R

15pF

SIGNAL

GENERATOR

A

0V

+1.5V

0V

tPLH

tPHL

-1.5V

VCC

RO

1.5V

1.5V

0V

FIGURE 5A. TEST CIRCUIT

FIGURE 5B. MEASUREMENT POINTS

FIGURE 5. RS-485 RECEIVER PROPAGATION DELAY

SIGNAL

GENERATOR

RE485

B

A

RO

R

1k?

15pF

VCC

SW GND

FOR SHDN TESTS, SWITCH SHDN RATHER THAN RE485

PARAMETER

tHZ

tLZ

tZH

tZL

tZH(SHDN)

tZL(SHDN)

SHDN/RE485

1/-

1/-

1/-

1/-

-/0

-/0

A

+1.5V

-1.5V

+1.5V

-1.5V

+1.5V

-1.5V

SW

GND

VCC

GND

VCC

GND

VCC

SHDN

(FOR SHDN TESTS)

RE485

tZH

tZH(SHDN)

RO

tZL

tZL(SHDN)

RO

3V

1.5V

0V

ENABLED

3V

1.5V

1.5V

0V

tHZ

OUTPUT HIGH

1.5V

VOH - 0.5V VOH

0V

tLZ

1.5V

OUTPUT LOW

VCC

VOL + 0.5VVOL

FIGURE 6A. TEST CIRCUIT

FIGURE 6B. MEASUREMENT POINTS

FIGURE 6. RS-485 RECEIVER ENABLE AND DISABLE TIMES

FN8776 Rev 1.00

October 21, 2016

Page 10 of 23

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