1

2

3

4

5

6

7

8

Top View

Narrow Body

TX

K

GND

SO Package

L

Si9243AEY

Vishay Siliconix

www.vishay.com

4

Document Number: 70788

S-02936—Rev. D, 22-Jan-01

PIN CONFIGURATION

ORDERING INFORMATION

Part Number

Temperature Range

Si9243AEY

–40 to 125

_C

PIN DESCRIPTION

Pin Number

Symbol

Description

1

K Receiver, Output

2

L Receiver, Output

3

Positive Power Supply

4

TX

Transmit, Input

5

GND

Ground Connection

6

K

K Transmit/Receive, Bidirectional

7

Battery Power Supply

8

L

L Transmit, Input

FUNCTIONAL DESCRIPTION

The Si9243AEY can be either in transmit or receive mode and

detection circuits.

The voltage on the K and L pins are internally compared to

In order to be in transmit mode, TX must be set “low.” The TX

signal is then internally inverted and turns the MOSFET on,

causing the K pin to be “low.” In transmit mode, the processor

there is no fault. In the event of over temperature, or short

will follow the K pin. The fault will be reset when TX is toggled

When the TX pin is set “high” the Si9243AEY is in receive

outputs will follow L and K inputs respectively.