TFBS4650

Document Number 84672

Rev. 1.2, 28-May-08

Vishay Semiconductors

www.vishay.com

2

For technical questions within your region, please contact one of the following:

irdasupportAM@vishay.com, irdasupportAP@vishay.com, irdasupportEU@vishay.com

Functional Block Diagram

Pin Description

Pinout

TFBS4650, bottom view

weight 0.05 g

IRED Driver

TXD

SD

GND

IREDA

RXD

Amplifier

Comparator

Tri-State

Driver

Mode

Control

PD

IRED

ASIC

IREDC

19283

Pin number

Function

Description

I/O

Active

1IREDA

unregulated power supply can be used.

2

IREDC

IRED cathode, do not connect for standard operation

3TXD

Transmitter data input. Setting this input above the threshold turns on the

transmitter.

This input switches the IRED with the maximum transmit pulse width of

about 50 µs.

IHigh

4RXD

Receiver output. Normally high, goes low for a defined pulse duration with

the rising edge of the optical input signal. Output is a CMOS tri-state driver,

OLow

5SD

Shut down. Logic low at this input enables the receiver, enables the

transmitter, and un-tri-states the receiver output. It must be driven high for

shutting down the transceiver.

IHigh

6

Power supply, 2.4 V to 3.6 V. This pin provides power for the receiver and

7

GND

Ground

19284