TFDU4101

www.vishay.com

Vishay Semiconductors

Rev. 1.6, 04-Jul-12

2

Document Number: 81288

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

FUNCTIONAL BLOCK DIAGRAM

Controlled

Driver

Tri-State

Driver

GND

TXD

RXD

Amplifier

Comparator

SD

Logic

and

Control

IRED C

18468

PIN DESCRIPTION

PIN

NUMBER

SYMBOL

DESCRIPTION

I/O

ACTIVE

1

IRED anode

only necessary for controlling the IRED current when a current reduction

below 300 mA is intended to operate in IrDA low power mode.

This pin is allowed to be supplied from an uncontrolled power supply

2

IRED cathode

IRED cathode, internally connected to driver transistor

3TXD

This Schmitt-Trigger input is used to transmit serial data when SD is low.

An on-chip protection circuit disables the LED driver if the TXD pin is

asserted for longer than 50 μs (max. 300 μs).

IHigh

4RXD

Received data output, push-pull CMOS driver output capable of driving

standard CMOS or TTL loads. During transmission the RXD output is

active (echo-on). No external pull-up or pull-down resistor is required.

Floating with a weak pull-up of 500 k

 (typ.) in shutdown mode.

OLow

5

SD

Shutdown

I

High

Supply voltage

7

NC

No internal connection

I

8

GND

Ground