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Document Number: 70788

S11-0975-Rev. F, 16-May-11

Vishay Siliconix

Si9243A

This document is subject to change without notice.

PIN CONFIGURATION

FUNCTIONAL DESCRIPTION

The Si9243AEY can be either in transmit or receive mode

detection circuits.

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

"high".

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

each other there is no fault. In the event of over temperature,

output to protect the IC. The K pin will stay in high impedance

the K output is off.

When the TX pin is set "high" the Si9243AEY is in receive

outputs will follow L and K inputs respectively.

1

2

3

4

5

6

7

8

Top View

Narrow Body

TX

K

GND

SO Package

L

ORDERING INFORMATION

Part Number

Temperature Range

Si9243AEY-T1

- 40 to 125 °C

Si9243AEY-T1-E3 (Lead (Pb)-free)

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