ISL33334E, ISL33337E

4

FN8776.1

October 21, 2016

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2

1

0

0

0

ON

N.A.

High-Z

N.A.

ON

115k

RS-485 Rx

2

1

0

1

0

ON

N.A.

ON

N.A.

ON

115k

RS-485 Tx

and Rx

2111

0

High-Z

N.A.

ON

N.A.

ON

115k

RS-485 Tx

2

1

0

0

1

ON

N.A.

High-Z

N.A.

ON

20M

RS-485 Rx

2

1

0

1

1

ON

N.A.

ON

N.A.

ON

20M

RS-485 Tx

and Rx

2111

1

High-Z

N.A.

ON

N.A.

ON

20M

RS-485 Tx

1 AND 2

0

X

X

X

High-Z

High-Z

High-Z

High-Z

OFF

N.A.

Shutdown

NOTE:

4. Charge pumps are off if SHDN = 0. If SHDN = 1, the charge pumps are on.

TABLE 3. ISL33334E AND ISL33337E FUNCTION TABLE

INPUTS

RECEIVER OUTPUTS

DRIVER OUTPUTS

CHARGE

PUMPS

DRIVER

DATA

RATE

(bps)

MODE

PORT

SHDN

RE485

DE485

SLOW485

RO

R1OUT

AND

R2OUT

Y AND Z

T1OUT AND

T2OUT

Truth Tables

RS-232 TRANSMITTING (PORT 1)

INPUTS

OUTPUTS

SHDN

T1IN

T2IN

T1OUT

T2OUT

10

01

1

10

11

0

11

00

1

11

10

0

0XX

High-Z

High-Z

RS-232 RECEIVING (PORT 1)

INPUTS

OUTPUTS

SHDN

R1IN

R2IN

R1OUT

R2OUT

1001

1

1011

0

1100

1

1110

0

1

Open

Open

1

1

0

X

X

High-Z

High-Z

RS-485 TRANSMITTING (PORT 2)

INPUTS

OUTPUTS

SHDN DE485

DI

SLOW485

YZ

DATA RATE

(bps)

1

1

0

0

0

1

115k

1

1

1

0

1

0

115k

1

1

0

1

0

1

20M

1

1

1

1

1

0

20M

1

0

X

X

High-Z High-Z

N.A.

0

X

X

X

High-Z High-Z

N.A.

RS-485 RECEIVING (PORT 2)

INPUTS

OUTPUT

SHDN

RE485

A-B

RO

10

≥-40mV

1

10

≤-200mV

0

1

0

Open or Shorted together

1

11

X

High-Z

0X

X

High-Z